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学者姓名:周剑

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Disturbance Effect of Highway Construction on Vegetation in Hexi Corridor, North-Western China SCIE
期刊论文 | 2024 , 15 (7) | FORESTS
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Abstract :

The ecological environment of the Hexi Corridor in China is fragile owing to its unique geographical conditions. Since the 21st century, the construction of highway projects in the Hexi Corridor has increased with the implementation of China's western development policy. The impact of highway construction on vegetation along roads is uncertain and requires attention. In this study, the normalized difference vegetation index (NDVI) was obtained based on remote sensing data, and the correlations between the vegetation index, climate changes, and highway construction from 2000 to 2019 were analyzed. The results showed that the NDVI of the Hexi Corridor showed a significant increasing trend, and the spatial difference was obvious, which was largely controlled by climatic conditions. Generally, the vegetation index was negatively correlated with temperature, but positively correlated with precipitation, and the correlation between the NDVI and precipitation was greater than that of temperature. The impact of highways on vegetation is a long-term process. In the eastern region of the Hexi Corridor, where the ecological environment is better, highway construction promoted vegetation development. However, in the western region with high desertification, the damage caused by highway construction to vegetation was serious, and the recovery rate of degraded vegetation was slow after the completion of highway construction. Although the vegetation development in the Hexi Corridor was mainly affected by precipitation, in the western region, highway construction was the main factor controlling vegetation disturbance within a certain range on both sides, and its contribution to vegetation disturbance reached 60%. The research results can improve understanding of the disturbance effect of highway construction on vegetation in arid areas.

Keyword :

NDVI NDVI Hexi Corridor Hexi Corridor climatic conditions climatic conditions disturbance effect disturbance effect highway construction highway construction

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GB/T 7714 Han, Zhenhua , Zhang, Luqing , Zhang, Fenxiang et al. Disturbance Effect of Highway Construction on Vegetation in Hexi Corridor, North-Western China [J]. | FORESTS , 2024 , 15 (7) .
MLA Han, Zhenhua et al. "Disturbance Effect of Highway Construction on Vegetation in Hexi Corridor, North-Western China" . | FORESTS 15 . 7 (2024) .
APA Han, Zhenhua , Zhang, Luqing , Zhang, Fenxiang , Zhou, Jian , Wang, Song . Disturbance Effect of Highway Construction on Vegetation in Hexi Corridor, North-Western China . | FORESTS , 2024 , 15 (7) .
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Study on Voids and Seepage Characteristics within Rock Fracture after Shear Dislocation Viewing from CT Test and Numerical Modeling SCIE
期刊论文 | 2024 , 14 (3) | APPLIED SCIENCES-BASEL
WoS CC Cited Count: 1
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Abstract :

In rock mass engineering, stress balance changes often cause the relative slip of fractures along a wall surface, impacting the seepage behavior of fluid in the fractures. Using computer tomography (CT) scanning, spatial models of fractures with dislocations ranging from 0 to 10 mm were created to explore the relationship between changes in fracture dislocation and changes in fluid flow behavior, respectively. The spatial fractal dimension of cavity distribution within the fractures was calculated using a thin-plate filling approach to characterize the complexity of the fracture cavity distribution. The fluid flow within the dislocation fractures was then simulated using COMSOL, and the effect of cavity alterations in the form of dislocation on the fluid seepage behavior was analyzed using the spatial fractal. The results show that the values of mechanical aperture after dislocation of the fracture obtained by a CT test are normally distributed, the distribution range of mechanical aperture gradually widens with an increase in the dislocation distance, and the average mechanical aperture increases on a logarithmic curve. The relative spatial fractal dimension decreases gradually with an increase in dislocation distance, and the interconnected pathways within the fracture decrease; in addition, it is observed that the change in the relative spatial fractal dimension is closely correlated with the change in the mean mechanical aperture. Numerical simulations of dislocation fracture seepage found that the permeability increases nonlinearly with increasing dislocation distance. When the dislocation distance reaches 5 mm, nonlinear behaviors such as eddy currents occur, and the influence range of eddy currents gradually expands with the increase in dislocation distance under the influence of the boundary. Moreover, the inertia coefficient B in the Forchheimer equation and the critical hydraulic gradient Jc, which can describe the nonlinear seepage characteristics, show a power function decreasing trend with increasing dislocation distance, and the fluid in the fracture is more likely to produce nonlinear flow.

Keyword :

fracture shear dislocation fracture shear dislocation nonlinear seepage nonlinear seepage seepage numerical simulation seepage numerical simulation void fractal dimension void fractal dimension CT scans CT scans

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GB/T 7714 Dong, Tingfa , Zhou, Jian , Yan, Ziqian et al. Study on Voids and Seepage Characteristics within Rock Fracture after Shear Dislocation Viewing from CT Test and Numerical Modeling [J]. | APPLIED SCIENCES-BASEL , 2024 , 14 (3) .
MLA Dong, Tingfa et al. "Study on Voids and Seepage Characteristics within Rock Fracture after Shear Dislocation Viewing from CT Test and Numerical Modeling" . | APPLIED SCIENCES-BASEL 14 . 3 (2024) .
APA Dong, Tingfa , Zhou, Jian , Yan, Ziqian , Wu, Yanfang , Mao, Tianqiao . Study on Voids and Seepage Characteristics within Rock Fracture after Shear Dislocation Viewing from CT Test and Numerical Modeling . | APPLIED SCIENCES-BASEL , 2024 , 14 (3) .
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地震P波倾斜入射下单面坡动力响应分析
期刊论文 | 2024 , 67 (6) , 2350-2363 | 地球物理学报
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Abstract :

地震诱发滑坡分布呈现"背坡面"效应的特点,表明地震波入射方向对边坡动力响应及失稳有巨大的影响,然而斜入射下边坡动力响应研究尚不充分.本文基于时域弹性波理论和黏弹性人工边界条件,利用FLAC3D内嵌的Fish语言编程实现了 P波倾斜入射.通过对比算例与理论解,验证了 P波倾斜入射方法的准确性.研究了简谐波、加窗简谐波及天然地震波对单面坡激发的动力响应,并以加窗简谐波为例探索了输入波频率与入射角影响下单面坡(坡高90 m)的动力响应特征.计算结果表明:由于输入波首尾速度非零的冲击效应,简谐波作用下坡肩位置波首与波尾段峰值加速度值超过中间稳定段的1倍以上.简谐波和加窗简谐波在坡表相同部位产生的加速度响应要强于天然地震波.加窗简谐波20°入射下,坡体水平向加速度分布随输入波频率变化较竖直向的显著;当输入波频率为10 Hz时,坡肩位置峰值加速度出现最大值,约为输入波幅值的3.33倍,此时边坡高度与边坡动力响应垂向放大的临界高度一致.频率为2.5 Hz的加窗简谐波在不同入射角下,边坡竖直向加速度分布的变化高于水平向;当入射角为60°时,坡肩位置峰值加速度出现最大值,约为输入波幅值的3.12倍.研究表明垂直入射时会低估地震波对边坡动力扰动的影响.

Keyword :

P波斜入射 P波斜入射 FLAC3D FLAC3D 边坡动力响应 边坡动力响应 数值模拟 数值模拟

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GB/T 7714 谷坤生 , 周剑 , 戴福初 et al. 地震P波倾斜入射下单面坡动力响应分析 [J]. | 地球物理学报 , 2024 , 67 (6) : 2350-2363 .
MLA 谷坤生 et al. "地震P波倾斜入射下单面坡动力响应分析" . | 地球物理学报 67 . 6 (2024) : 2350-2363 .
APA 谷坤生 , 周剑 , 戴福初 , 张路青 . 地震P波倾斜入射下单面坡动力响应分析 . | 地球物理学报 , 2024 , 67 (6) , 2350-2363 .
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Numerical analysis of the influence of quartz crystal anisotropy on the thermal-mechanical coupling behavior of monomineral quartzite SCIE
期刊论文 | 2024 , 10 (1) | GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
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Abstract :

Studying crystal anisotropy is of great importance for understanding the thermal-mechanical coupling behavior of crystalline rocks in deep underground engineering. In this study, a microscopic parameter calibration method incorporating the size effect is proposed. Subsequently, a thermal-mechanical coupling model accounting for the quartz crystal anisotropy is established to investigate the thermal-mechanical coupling behavior of monomineral quartzite. The results show that thermal-induced microcracks are exclusively distributed along crystal boundaries, and initiate preferentially from crystal boundaries with a larger average linear thermal expansion coefficient, eventually leading to the formation of a crack network. With the increase in temperature, the peak strength of monomineral quartzite increases slightly at first and then decreases rapidly, and the transition threshold temperature is 200 degrees C. Both elastic modulus and Poisson's ratio show a monotonic pattern, with abrupt changes occurring at 200 and 300 degrees C, respectively. The monomineral quartzite exhibits a significant compaction stage under uniaxial compression, and the ductile strengthening critical temperature for monomineral quartzite are between 400 and 500 degrees C. The quartz crystal anisotropy leads to an anisotropic distribution of inclination angles for tensile microcracks under high temperatures while having no obvious effect on the shear microcracks. In addition, the average size of fragments generated under uniaxial compression is influenced by thermal cracking, demonstrating an initial decrease followed by an increase, and the distribution of fragment sizes is solely correlated with the temperature, which is more concentrated with the increase in temperature.

Keyword :

Thermal cracking Thermal cracking GBM GBM Crystal anisotropy Crystal anisotropy Quartz crystal Quartz crystal Orientation Orientation Quartzite Quartzite

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GB/T 7714 Peng, Xiao , Zhou, Jian , Gu, Kunsheng et al. Numerical analysis of the influence of quartz crystal anisotropy on the thermal-mechanical coupling behavior of monomineral quartzite [J]. | GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES , 2024 , 10 (1) .
MLA Peng, Xiao et al. "Numerical analysis of the influence of quartz crystal anisotropy on the thermal-mechanical coupling behavior of monomineral quartzite" . | GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES 10 . 1 (2024) .
APA Peng, Xiao , Zhou, Jian , Gu, Kunsheng , Zhang, Lei , Zhang, Luqing , Wang, Song . Numerical analysis of the influence of quartz crystal anisotropy on the thermal-mechanical coupling behavior of monomineral quartzite . | GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES , 2024 , 10 (1) .
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Modeling obliquely incident seismic wave propagation in rocks via the FDM-DEM coupling scheme: Algorithms and applications SCIE
期刊论文 | 2024 , 176 | COMPUTERS AND GEOTECHNICS
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The incidence angle of seismic waves plays a pivotal role in the stability analysis of structures in near-field zones. Despite its importance, the application of obliquely incident seismic waves within models of discontinuous media has been limited. This study introduces a novel approach that integrates the oblique incidence of seismic waves into a coupled model employing both the Finite Difference Method (FDM) and the Discrete Element Method (DEM). We validate the accuracy of seismic wave propagation under oblique incidence in two FDM-DEM coupling models-overlapping coupling and interface coupling-through comparisons with theoretical solutions. For vertically incident seismic P-waves, both models yield similar results. However, under oblique incidence, the overlapping coupling model demonstrates superior accuracy, with a maximum error of approximately 4.217 %, compared to about 10 % in the interface coupling model. Our findings also show that while the relative sizes of particle diameter and overlap length minimally affect accuracy, the arrangement of particles markedly influences the results. Furthermore, we apply this method to a slope model to investigate the failure process, revealing that the nature of the sliding body shifts from tensile sliding to tensile ejection as the incidence angle increases.

Keyword :

Parameters study Parameters study Oblique incidence algorithm Oblique incidence algorithm Seismic wave propagation Seismic wave propagation FDM-DEM coupling scheme FDM-DEM coupling scheme Failure process of the slope Failure process of the slope

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GB/T 7714 Gu, Kunsheng , Zhou, Jian , Dai, Fuchu et al. Modeling obliquely incident seismic wave propagation in rocks via the FDM-DEM coupling scheme: Algorithms and applications [J]. | COMPUTERS AND GEOTECHNICS , 2024 , 176 .
MLA Gu, Kunsheng et al. "Modeling obliquely incident seismic wave propagation in rocks via the FDM-DEM coupling scheme: Algorithms and applications" . | COMPUTERS AND GEOTECHNICS 176 (2024) .
APA Gu, Kunsheng , Zhou, Jian , Dai, Fuchu , Zhang, Luqing , Cheng, Wei , Han, Zhenhua . Modeling obliquely incident seismic wave propagation in rocks via the FDM-DEM coupling scheme: Algorithms and applications . | COMPUTERS AND GEOTECHNICS , 2024 , 176 .
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Numerical study of voids geometry effects on sandstone's mesoscopic fracture Mechanism: Insights from acoustic emission and moment tensor inversion SCIE
期刊论文 | 2024 , 133 | THEORETICAL AND APPLIED FRACTURE MECHANICS
WoS CC Cited Count: 1
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Abstract :

In the field of rock mechanics, the study of void shape on the mechanical properties and fracture mechanisms of sandstone is crucial for the progression of rock engineering practices. In this study, PFC3D is utilized to conduct numerical simulations of uniaxial compression on intact rock and brittle rocks containing five different shapes of voids (including circular, inverted U-shaped, trapezoidal, rectangular, and square). By employing acoustic emission and moment tensor inversion techniques, the microscopic fracture mechanisms of rocks with different void shapes are revealed. Our key findings reveal: (1) The PFC3D's Soft-Bond Model is adept at simulating acoustic emissions with high accuracy, facilitating an authentic reproduction of the uniaxial compression process in sandstone, including the nonlinear compaction stage. (2) The presence of hole defects markedly undermines the structural strength and deformability of the sandstone, with circular holes having minimal impact, whereas rectangular holes exert the most significant detriment. (3) A thorough analysis of fracture mechanisms demonstrates that specimens with hole defects primarily undergo initial tensile, remote cracks, V-shaped notch, and shear fractures, with shear fractures being pivotal in leading to specimen failure by rapidly evolving into macroscopic fractures that merge with V-shaped notches. (4) Acoustic Emission (AE) analysis highlights the distribution of tensile stress around the upper and lower extremities of the holes and shear stress along the left and right sidewalls, establishing shear stress as the dominant factor in the failure of specimens with hole defects.

Keyword :

Uniaxial compression Uniaxial compression Fracture behavior Fracture behavior Void shape Void shape Acoustic emission Acoustic emission Moment tensor inversion Moment tensor inversion

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GB/T 7714 Zhou, Jian , Zhang, Lei , Peng, Xiao et al. Numerical study of voids geometry effects on sandstone's mesoscopic fracture Mechanism: Insights from acoustic emission and moment tensor inversion [J]. | THEORETICAL AND APPLIED FRACTURE MECHANICS , 2024 , 133 .
MLA Zhou, Jian et al. "Numerical study of voids geometry effects on sandstone's mesoscopic fracture Mechanism: Insights from acoustic emission and moment tensor inversion" . | THEORETICAL AND APPLIED FRACTURE MECHANICS 133 (2024) .
APA Zhou, Jian , Zhang, Lei , Peng, Xiao , Liu, Hao , Jiang, Ren-Hua , Zhang, Lu-Qing et al. Numerical study of voids geometry effects on sandstone's mesoscopic fracture Mechanism: Insights from acoustic emission and moment tensor inversion . | THEORETICAL AND APPLIED FRACTURE MECHANICS , 2024 , 133 .
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Effect of Mineral Grain and Hydrate Layered Distribution Characteristics on the Mechanical Properties of Hydrate-Bearing Sediments SCIE
期刊论文 | 2023 , 16 (21) | ENERGIES
WoS CC Cited Count: 1
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The mechanical characteristics of gas hydrate-bearing sediments (HBS) are important for evaluating reservoir stability. The interbedded formation of HBS is common in target mining reservoirs. Existing studies on the triaxial mechanical properties of HBS are primarily based on homogeneous and isotropic samples. Therefore, the stress-strain law of the target mining reservoirs cannot be predicted accurately. In this study, a series of sediment models with interlayers of coarse and fine mineral grains were established based on the PFC3D code, and the influence of the layered distribution characteristics of sediment particles and hydrates on the macroscopic mechanical behaviour of the reservoir was comprehensively analysed. The triaxial compression simulation results indicate that the peak strength, deformation modulus, and cohesion of the layered HBS are significantly lower than those of the homogeneous model. The deformation modulus of the reservoir is mainly affected by the fine-grained layer without hydrates. When the coarse and fine grains correspond to different mineral components, the two minerals are heterogeneous in terms of their micromechanical parameters, which can further reduce the macroscopic mechanical parameters of the HBS. In addition, the layered distribution of hydrate results in significant anisotropy of the reservoir. This study constitutes a reference regarding the control mechanism of gas hydrate reservoir strength.

Keyword :

triaxial compression simulation triaxial compression simulation mechanical properties mechanical properties anisotropy anisotropy layered hydrate-bearing sediments layered hydrate-bearing sediments

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GB/T 7714 Han, Zhenhua , Zhang, Luqing , Zhou, Jian et al. Effect of Mineral Grain and Hydrate Layered Distribution Characteristics on the Mechanical Properties of Hydrate-Bearing Sediments [J]. | ENERGIES , 2023 , 16 (21) .
MLA Han, Zhenhua et al. "Effect of Mineral Grain and Hydrate Layered Distribution Characteristics on the Mechanical Properties of Hydrate-Bearing Sediments" . | ENERGIES 16 . 21 (2023) .
APA Han, Zhenhua , Zhang, Luqing , Zhou, Jian , Pan, Zhejun , Wang, Song , Li, Ruirui . Effect of Mineral Grain and Hydrate Layered Distribution Characteristics on the Mechanical Properties of Hydrate-Bearing Sediments . | ENERGIES , 2023 , 16 (21) .
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Numerical investigation of interactions between hydraulic and pre-existing opening-mode fractures in crystalline rocks based on a hydro-grain-based model SCIE
期刊论文 | 2023 , 229 | GEOENERGY SCIENCE AND ENGINEERING
WoS CC Cited Count: 2
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Hot dry rock (HDR) is deep geothermal reservoir rock predominantly containing granite, whose physical and mechanical properties are governed by heterogeneous crystal structures. However, the fluid conductivity of intact granite with ultra-low permeability cannot be reformed using existing techniques. Complex fracture networks must be created by connecting hydraulic fractures with natural fractures developed in reservoirs. In this study, we introduce the wall barrier method into the novel hydro-grain-based model (hydro-GBM) to build a prefractured granite model at the mineral grain scale. This model enables investigation of the effects of the stress environment, mineral spatial distribution, and fluid injection rate on hydraulic fracturing characteristics. Microcracks around the inner tips of pre-existing fractures reproduce the initiation, propagation, and coalescence behaviors similar to experimental results. Mineral spatial distributions induce random changes in the propagation paths of hydraulic fractures. Increasing the fluid injection rate delays the deflection of hydraulic fractures and extends the propagation distance along the major axes of pre-existing fractures. The average activity level and proportion of large seismic events are reduced by injecting low-rate fluid. In summary, our results reveal the interactions between hydraulic and pre-existing fractures and provide a valuable reference for constructing an efficient enhanced geothermal system (EGS) for deep reservoirs.

Keyword :

Microcracking behavior Microcracking behavior Hydraulic fracturing Hydraulic fracturing Acoustic emission Acoustic emission Pre-existing fracture Pre-existing fracture Grain-based model Grain-based model Particle flow code Particle flow code

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GB/T 7714 Wang, Song , Zhou, Jian , Zhang, Luqing et al. Numerical investigation of interactions between hydraulic and pre-existing opening-mode fractures in crystalline rocks based on a hydro-grain-based model [J]. | GEOENERGY SCIENCE AND ENGINEERING , 2023 , 229 .
MLA Wang, Song et al. "Numerical investigation of interactions between hydraulic and pre-existing opening-mode fractures in crystalline rocks based on a hydro-grain-based model" . | GEOENERGY SCIENCE AND ENGINEERING 229 (2023) .
APA Wang, Song , Zhou, Jian , Zhang, Luqing , Han, Zhenhua , Kong, Yanlong . Numerical investigation of interactions between hydraulic and pre-existing opening-mode fractures in crystalline rocks based on a hydro-grain-based model . | GEOENERGY SCIENCE AND ENGINEERING , 2023 , 229 .
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Modeling Injection-Induced Fracture Propagation in Crystalline Rocks by a Fluid-Solid Coupling Grain-Based Model SCIE
期刊论文 | 2023 , 56 (8) , 5781-5814 | ROCK MECHANICS AND ROCK ENGINEERING
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Hydraulic fracturing, which determines geothermal resource productivity, is one of the critical technical components in the construction of hot dry rock (HDR) reservoirs. Although the mechanical coupling between solid and fluid has been included in algorithms based on the discrete element method (DEM) generally employed to investigate hydraulic fracturing, crystalline rocks of reservoirs are mostly treated as homogeneous isotropic models without considering their petrographic texture. By combining a grain-based model (GBM) and a modified fluid-solid coupling algorithm, a novel hydro-GBM is constructed in this study to analyze the hydraulic fracturing response of polycrystalline rocks. Moreover, acoustic emission (AE) events during fracturing are extracted to describe the characteristics of hydraulic-fracturing-induced seismicity. Under in-situ conditions with high differential stress, the propagation direction of hydraulic fractures is mainly perpendicular to the direction of minimum in-situ stress, with little influence by material heterogeneity and fluid viscosity; under near-hydrostatic in-situ stress conditions, the microcracks along the mineral boundaries increase remarkably, and the fracture pattern tends to be complex, especially when a low-viscosity fluid is injected into the rock. From the Gutenberg-Richter type relationship between the AE event numbers and the moment magnitudes, it is found that large induced seismic events increase with in-situ stress and with fluid viscosity. In summary, the proposed hydro-GBM can well reproduce the propagation behavior of hydraulic fractures influenced by material heterogeneity, and the research results reveal the interactions between petrographic texture, in-situ stress, fluid viscosity, and hydraulic fracturing characteristics, which will provide a valuable reference for on-site reservoir stimulation.

Keyword :

Grain-based model Grain-based model Fluid-solid coupling algorithm Fluid-solid coupling algorithm Acoustic emission Acoustic emission Particle flow code Particle flow code Hydraulic fracturing Hydraulic fracturing Micro-cracking behavior Micro-cracking behavior

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GB/T 7714 Wang, Song , Zhou, Jian , Zhang, Luqing et al. Modeling Injection-Induced Fracture Propagation in Crystalline Rocks by a Fluid-Solid Coupling Grain-Based Model [J]. | ROCK MECHANICS AND ROCK ENGINEERING , 2023 , 56 (8) : 5781-5814 .
MLA Wang, Song et al. "Modeling Injection-Induced Fracture Propagation in Crystalline Rocks by a Fluid-Solid Coupling Grain-Based Model" . | ROCK MECHANICS AND ROCK ENGINEERING 56 . 8 (2023) : 5781-5814 .
APA Wang, Song , Zhou, Jian , Zhang, Luqing , Nagel, Thomas , Han, Zhenhua , Kong, Yanlong . Modeling Injection-Induced Fracture Propagation in Crystalline Rocks by a Fluid-Solid Coupling Grain-Based Model . | ROCK MECHANICS AND ROCK ENGINEERING , 2023 , 56 (8) , 5781-5814 .
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Modeling Interactions between Hydraulic and Closed Natural Fractures in Brittle Crystalline Rocks: A Fluid-Solid Coupling Grain-Based Approach for Characterizing Microcracking Behaviors SCIE
期刊论文 | 2023 , 57 (2) , 889-920 | ROCK MECHANICS AND ROCK ENGINEERING
WoS CC Cited Count: 2
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Activating closed natural fractures (NFs) in hot dry rock (HDR) reservoirs is a critical way to improve fluid conductivity and stimulate production. However, the current hydraulic fracturing simulation technology is limited in its ability to investigate the interaction mechanism between hydraulic fractures (HFs) and NFs under the interference of mineral heterogeneity in HDR. In this study, we combine a modified hydro-grain-based model (hydro-GBM) and the smooth joint model (SJM) to establish a discrete element model of granite with closed NFs, investigating the effects of in-situ stress, approach angle, and physico-mechanical properties of NFs on interaction modes. Our results show that mineral heterogeneity induces HFs on both sides of the borehole to propagate asymmetrically along low-strength minerals and mineral boundaries, enhancing the complexity of HFs. As the approach angle, NF interface friction coefficient, or NF bond strengths decrease and differential in-situ stress or NF permeability increases, the offset of HFs propagating along NFs increases, thus promoting the activation degree of NFs and resulting in a decline in the average activity level of acoustic emission (AE) events and the proportion of large events in NFs. Furthermore, numerical simulations reveal the evolution laws of fracturing results, such as breakdown pressure, fracture propagation pressure, spatial distribution of microcracks, fluid pressure field, and normal stresses on NFs, which provide valuable insights for constructing complex and efficient fracture networks in HDR reservoirs. A smooth joint coupling hydro-grain-based model is proposed to describe the crystalline rock with closed natural fractures from the mineral grain scale.The model reproduces the interaction modes between hydraulic fractures and natural fractures similar to the experimental results.Effects of in-situ stress, approach angle, and physico-mechanical properties of natural fractures on interaction processes are deeply analyzed.Evolution laws of normal stresses and AE responses for natural fractures during interactions are revealed.

Keyword :

Particle flow code Particle flow code Hydraulic fracturing Hydraulic fracturing Fracture propagation behavior Fracture propagation behavior Grain-based model Grain-based model Sensitivity analysis Sensitivity analysis Natural fracture Natural fracture

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GB/T 7714 Wang, Song , Zhou, Jian , Zhang, Luqing et al. Modeling Interactions between Hydraulic and Closed Natural Fractures in Brittle Crystalline Rocks: A Fluid-Solid Coupling Grain-Based Approach for Characterizing Microcracking Behaviors [J]. | ROCK MECHANICS AND ROCK ENGINEERING , 2023 , 57 (2) : 889-920 .
MLA Wang, Song et al. "Modeling Interactions between Hydraulic and Closed Natural Fractures in Brittle Crystalline Rocks: A Fluid-Solid Coupling Grain-Based Approach for Characterizing Microcracking Behaviors" . | ROCK MECHANICS AND ROCK ENGINEERING 57 . 2 (2023) : 889-920 .
APA Wang, Song , Zhou, Jian , Zhang, Luqing , Han, Zhenhua , Kong, Yanlong . Modeling Interactions between Hydraulic and Closed Natural Fractures in Brittle Crystalline Rocks: A Fluid-Solid Coupling Grain-Based Approach for Characterizing Microcracking Behaviors . | ROCK MECHANICS AND ROCK ENGINEERING , 2023 , 57 (2) , 889-920 .
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