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学者姓名：周剑
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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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Abstract ：
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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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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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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Abstract ：
A shaking table model test was carried out to study the failure mechanism of an anti-dip rock slope with complex structural planes. The effect of the input seismic wave frequency, types and structural plane on the slope's dynamic response were considered. The test results show that the input seismic wave frequency is closer to the slope's natural frequency, the acceleration amplification factor is greater. The amplification effect of input bedrock seismic waves is higher than that of soil seismic waves for rock slopes. The existence of soft-hard rock interface and tectonic fissures inhibit the slope's amplification effect on seismic waves, and the inhibitory effect of tectonic fissures is higher than that of soft-hard rock interface. Slope displacement increases with the increase of input wave amplitude, but the change is not obvious with the increase of frequency. The time cumulative effect is more obvious under high amplitude input seismic wave for the slope's displacement. The slope deformation and instability mode can be called 'bending-shear slip instability'. The results of this paper are meaningful for the further understanding the dynamic failure mode of anti-dip rock slope with complex structural planes.
Keyword ：
Anti-dip rock slope Anti-dip rock slope Shaking table test Shaking table test Dynamic response Dynamic response Complex structural plane Complex structural plane Failure mode Failure mode
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| GB/T 7714 | Gu, Kunsheng , Zhou, Jian , Guo, Mingzhu . Shaking table test study of anti-dip rock slope with complex structural plane under earthquake [J]. | BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT , 2024 , 83 (11) . |
| MLA | Gu, Kunsheng et al. "Shaking table test study of anti-dip rock slope with complex structural plane under earthquake" . | BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT 83 . 11 (2024) . |
| APA | Gu, Kunsheng , Zhou, Jian , Guo, Mingzhu . Shaking table test study of anti-dip rock slope with complex structural plane under earthquake . | BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT , 2024 , 83 (11) . |
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Abstract ：
Rock avalanche disasters in alpine and gorge regions are frequent and large in scale and cause severe damage. The movement of a rock avalanche is complex and has not been fully studied. The deposits of a rock avalanche can provide valuable insights into its movement process, which is crucial in understanding the rock fragmentation mechanism and predicting disaster-affected areas. Taking the Wangjiapo rock avalanche in Yunnan Province of China as an example, the size, shape and distribution characteristics of the deposit were analyzed based on field surveys, unmanned aerial vehicle (UAV) photography and image recognition technology. Initially, 3062 deposited rock blocks were manually measured in the field. Subsequently, the Particles/Pores and Cracks Analysis System (PCAS) was employed to identify 11,357 rock blocks with an area greater than 0.1 m2 from UAV orthophotos. By comparing the characteristics of the rock blocks obtained through image recognition and manual measurement, the statistical analysis of UAV aerial imagery combined with PACS proved feasible in studying the Wangjiapo rock avalanche. The results showed that the rock block movement was accompanied by fragmentation and sorting processes; furthermore, the roundness increased with the migration distance. Small blocks were more prevalent at the foot of the slope, while irregularly shaped, large blocks dominated in source areas. The movement of huge blocks was characterized by significant potential energy-driven features and inertia advantages, allowing them to travel farther than smaller blocks, and they tended to be concentrated in the central area of the deposit. Additionally, affected by the cementation degree of breccia and the topography, the blocks in the eastern and western deposit areas exhibited different fragmentation and deposition characteristics.
Keyword ：
PCAS PCAS characteristics of rock block characteristics of rock block rock avalanche deposit rock avalanche deposit image recognition image recognition UAV UAV
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| GB/T 7714 | Han, Zhenhua , Zhang, Luqing , Zhou, Jian et al. Characteristics of Rock Avalanche Deposit in Wangjiapo, Ludian Based on UAV Aerial Image Recognition [J]. | REMOTE SENSING , 2024 , 16 (20) . |
| MLA | Han, Zhenhua et al. "Characteristics of Rock Avalanche Deposit in Wangjiapo, Ludian Based on UAV Aerial Image Recognition" . | REMOTE SENSING 16 . 20 (2024) . |
| APA | Han, Zhenhua , Zhang, Luqing , Zhou, Jian , Wang, Song , Sun, Juanjuan , Li, Ruirui et al. Characteristics of Rock Avalanche Deposit in Wangjiapo, Ludian Based on UAV Aerial Image Recognition . | REMOTE SENSING , 2024 , 16 (20) . |
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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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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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Abstract ：
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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Abstract ：
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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