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学者姓名：李严严
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Abstract ：
Affected by discontinuities, the properties of rock masses are characterized by strong scale dependency and anisotropy. Rock mass samples taken at any scale smaller than the representative elementary volume (REV) size could lead to an incorrect characterization and property upscaling. To better understand the sampling problem, numerical tests based on an outcrop-data-based discrete fracture network (DFN) model were conducted, trying to determine the REV size and its anisotropy. The model was validated and subsequently sampled to produce 455 rectangular samples with a width ranging from 0.05 to 21 m and a constant height-to-width ratio of 2. The samples were introduced into a 3D particle flow code model to create synthetic rock mass (SRM) samples. Numerical uniaxial compressive tests at different loading directions were performed to study the scale dependency and anisotropy of mechanical parameters. The results show that the mechanical REV sizes in different directions differ, changing between 7 and 19 m. The mechanical properties of rock mass samples in a REV size exhibit strong anisotropy, with the values of uniaxial compressive strength (UCS) and elastic modulus (E) varying from 5.6 to 10.3 MPa and 3.9 to 8.0 GPa, respectively. The simulated values of UCS were validated based on GSI and the Hoek-Brown failure criterion. The geometrical REV size based on the volumetric fracture intensity was calculated to be 7 m, equal to the minimum of the mechanical REV size; this suggests that the geometrical REV defines the lower bound of the REV size.
Keyword ：
Fracture network model Fracture network model Anisotropy Anisotropy Synthetic rock mass Synthetic rock mass Representative elementary volume Representative elementary volume Scale dependency Scale dependency
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| GB/T 7714 | Li, Yanyan , Wang, Rui , Chen, Jianping et al. Scale dependency and anisotropy of mechanical properties of jointed rock masses: insights from a numerical study [J]. | BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT , 2023 , 82 (4) . |
| MLA | Li, Yanyan et al. "Scale dependency and anisotropy of mechanical properties of jointed rock masses: insights from a numerical study" . | BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT 82 . 4 (2023) . |
| APA | Li, Yanyan , Wang, Rui , Chen, Jianping , Zhang, Zhihong , Li, Kun , Han, Xudong . Scale dependency and anisotropy of mechanical properties of jointed rock masses: insights from a numerical study . | BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT , 2023 , 82 (4) . |
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Abstract ：
本实用新型提供一种锚尾锥及带锚尾锥的锚杆装置，属于岩土工程防护技术领域。该锚尾锥包括锥头和锥尾，锥头包括第一端面和第二端面，锥头在第一端面和第二端面之间，直径依次递增，锥尾包括第三端面和第四端面，锥尾在第三端面和第四端面之间，直径依次递减，锥头的第二端面与锥尾的第三端面对接，形成锚尾锥，锚尾锥的中心设有锚孔，锚孔为通孔。该带锚尾锥的锚杆装置包括筋体、承载垫板、止浆塞、限位螺母和该锚尾锥，筋体顶部设有第一外螺纹，承载垫板套设于第一外螺纹上，承载垫板被限位螺母和止浆塞夹持于中间；锚尾锥设置于筋体的底部，承载垫板、止浆塞、限位螺母的中心通孔与锚孔对中。该锚尾锥具有自锁功能，该锚杆装置能够增加锚固力。
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| GB/T 7714 | 郑宏 , 李严严 , 张志红 et al. 锚尾锥及带锚尾锥的锚杆装置 : CN202222901048.2[P]. | 2022-11-01 . |
| MLA | 郑宏 et al. "锚尾锥及带锚尾锥的锚杆装置" : CN202222901048.2. | 2022-11-01 . |
| APA | 郑宏 , 李严严 , 张志红 , 林姗 . 锚尾锥及带锚尾锥的锚杆装置 : CN202222901048.2. | 2022-11-01 . |
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Abstract ：
This paper presents a study on an ancient river-damming landslide in the SE Tibet Plateau, China, with a focus on time-dependent gravitational creep leading to slope failure associated with progressive fragmentation during motion. Field investigation shows that the landslide, with an estimated volume of 4.9 x 10(7) m(3), is a translational toe buckling slide. Outcrops of landslide deposits, buckling, toe shear, residual landslide dam, and lacustrine sediments are distributed at the slope base. The landslide deposits formed a landslide dam over 60 m high and at one time blocked the Jinsha River. Optically stimulated luminescence dating for the lacustrine sediments indicates that the landslide occurred at least 2,600 years ago. To investigate the progressive evolution and failure behavior of the landslide, numerical simulations using the distinct element method are conducted. The results show that the evolution of the landslide could be divided into three stages: a time-dependent gravitational creep process, rapid failure, and granular flow deposition. It probably began as a long-term gravitationally induced buckling of amphibolite rock slabs along a weak interlayer composed of mica schist which was followed by progressive fragmentation during flow-like motion, evolving into a flow-like movement, which deposited sediments in the river valley. According to numerical modeling results, the rapid failure stage lasted 35 s from the onset of sudden failure to final deposition, with an estimated maximum movement rate of 26.8 m/s. The simulated topography is close to the post-landslide topography. Based on field investigation and numerical simulation, it can be found that the mica schist interlayer and bedding planes are responsible for the slope instability, while strong toe erosion caused by the Jinsha River caused the layered rock mass to buckle intensively. Rainfall or an earthquake cannot be ruled out as a potential trigger of the landslide, considering the climate condition and the seismic activity on centennial to millennial timescales in the study area.
Keyword ：
Distinct element method Distinct element method Creep Creep Tibetan Plateau Tibetan Plateau Voronoi Voronoi Landslide evolution Landslide evolution Buckling Buckling
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| GB/T 7714 | Li, Yanyan , Feng, Xuyang , Yao, Aijun et al. Progressive evolution and failure behavior of a Holocene river-damming landslide in the SE Tibetan Plateau, China [J]. | LANDSLIDES , 2022 , 19 (5) : 1069-1086 . |
| MLA | Li, Yanyan et al. "Progressive evolution and failure behavior of a Holocene river-damming landslide in the SE Tibetan Plateau, China" . | LANDSLIDES 19 . 5 (2022) : 1069-1086 . |
| APA | Li, Yanyan , Feng, Xuyang , Yao, Aijun , Zhang, Zhihong , Li, Kun , Wang, Qiusheng et al. Progressive evolution and failure behavior of a Holocene river-damming landslide in the SE Tibetan Plateau, China . | LANDSLIDES , 2022 , 19 (5) , 1069-1086 . |
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Abstract ：
Underground excavation often encountered rock masses embedded with pre-existing fractures. Conventional excavation analysis was generally based on a continuum description. In this study, to investigate the influence of randomly distributed discrete fractures on underground excavation, a finite element modeling approach based on a three-dimensional (3D) discrete fracture network (DFN) was utilized. The influence of fracture parameters including fracture intensity, dip angle and strike on the surrounding rock stability was considered in the simulation. The results suggested that fractures caused complexity in terms of the deformation behavior of rock masses around the underground cavern, facilitated the instability of surrounding rock. The intensity, dip angle and strike of fractures had different effects on the stress, displacement and failure modes of the jointed rock masses. The fracture intensity mainly affected the magnitudes of the induced stress and displacement of surrounding rock masses: a larger stress concentration and heterogeneous distribution were more likely to occur in rock masses with lower fracture intensity. While the dip angle and strike of fractures showed more impact on the distribution of displacement and failure modes of surrounding rock masses, especially for those on the roof and sidewall.
Keyword ：
In-situ stress In-situ stress Fracture Fracture Discrete fracture network Discrete fracture network Surrounding rock stability Surrounding rock stability
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| GB/T 7714 | Wei, Siyu , Li, Yanyan , Shang, Yanjun et al. Stability analysis of fractured rock mass around underground excavations based on a three-dimensional discrete fracture network [J]. | ENVIRONMENTAL EARTH SCIENCES , 2022 , 81 (3) . |
| MLA | Wei, Siyu et al. "Stability analysis of fractured rock mass around underground excavations based on a three-dimensional discrete fracture network" . | ENVIRONMENTAL EARTH SCIENCES 81 . 3 (2022) . |
| APA | Wei, Siyu , Li, Yanyan , Shang, Yanjun , Sun, Yuanchun , Li, Kun . Stability analysis of fractured rock mass around underground excavations based on a three-dimensional discrete fracture network . | ENVIRONMENTAL EARTH SCIENCES , 2022 , 81 (3) . |
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Abstract ：
Evaluation of the structural similarity or structural domains is a fundamental step for characterizing fractured rock masses. In this research, the division of rock masses into structural domains is treated as a multi-parameter clustering problem. The fuzzy spectral clustering method is used and proved to be an effective approach for measuring the structural similarity of jointed rock masses, in which six fracture parameters (i.e., orientation, aperture, roughness, fracture intensity P20, filling, and groundwater condition) are selected. The results suggest that the study area, located at the Songta dam site of China, could be grouped into three structural domains based on over 1300 fractures collected from 6 adjacent exploration tunnels. The results of the proposed method are validated by the Kolmogorov-Smirnov statistical test through quantifying the degree of similarity between fracture parameters collected from different areas. The results show that the fuzzy spectral clustering could provide reliable results which agree well with those obtained by the Kolmogorov-Smirnov test. Moreover, compared with the K-means algorithm, the new method could perform better in identifying structural domains. © 2021, Springer-Verlag GmbH Germany, part of Springer Nature.
Keyword ：
Rocks Rocks Fracture Fracture K-means clustering K-means clustering Computational complexity Computational complexity Rock mechanics Rock mechanics Groundwater Groundwater
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| GB/T 7714 | Li, Lihui , Li, Yanyan , Chen, Jianping . Evaluation of the structural similarity of fractured rock masses based on multiple fracture parameters [J]. | Bulletin of Engineering Geology and the Environment , 2021 , 80 (3) : 2189-2198 . |
| MLA | Li, Lihui et al. "Evaluation of the structural similarity of fractured rock masses based on multiple fracture parameters" . | Bulletin of Engineering Geology and the Environment 80 . 3 (2021) : 2189-2198 . |
| APA | Li, Lihui , Li, Yanyan , Chen, Jianping . Evaluation of the structural similarity of fractured rock masses based on multiple fracture parameters . | Bulletin of Engineering Geology and the Environment , 2021 , 80 (3) , 2189-2198 . |
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Abstract ：
Large-scale landsliding is an extremely important geological process in shaping landscapes in the Tibetan Plateau. In this research, an ancient river-damming landslide with an estimated debris volume of 4.9 x 10(7) m(3), located in the upper Jinsha River, SE Tibetan Plateau, was studied. The landslide once formed a dam over 60 m high and blocked the river. Lacustrine sediments, composed of silty clay with particle sizes of 0.002-0.25 mm, are intermittently distributed along both banks, extending about 6.5 km upstream. The OSL dating indicates that the lacustrine sediments have an age of 2.6 +/- 0.2 ka. Detailed field investigation and theoretical analysis was performed to investigate the characteristics, potential cause and mechanism of the landslide. The results suggest that the landslide was most likely triggered by buckling of planar rock slabs under gravity. It may start as a translational sliding along the weak interlayer composed of mica schist at the upper part of the slope and then formed buckles by curving amphibolite rock beds near the slope toe. The hillslope has still been affected by gravitational deformations, with geomorphology characterized by tension cracks, buckle folds, and small landslide scars distributed on the slope surface, suggesting that the evolution of the river valley caused by buckling deformation has not achieved equilibrium.
Keyword ：
Buckling Buckling Tibetan Plateau Tibetan Plateau Lacustrine sediments Lacustrine sediments Landslide dam Landslide dam
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| GB/T 7714 | Li, Yanyan , Feng, Xuyang , Yao, Aijun et al. A massive ancient river-damming landslide triggered by buckling failure in the upper Jinsha River, SE Tibetan Plateau [J]. | BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT , 2021 , 80 (7) : 5391-5403 . |
| MLA | Li, Yanyan et al. "A massive ancient river-damming landslide triggered by buckling failure in the upper Jinsha River, SE Tibetan Plateau" . | BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT 80 . 7 (2021) : 5391-5403 . |
| APA | Li, Yanyan , Feng, Xuyang , Yao, Aijun , Lin, Shan , Wang, Rui , Guo, Mingzhu . A massive ancient river-damming landslide triggered by buckling failure in the upper Jinsha River, SE Tibetan Plateau . | BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT , 2021 , 80 (7) , 5391-5403 . |
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Abstract ：
This paper presents a method for reconstructing denudation in sedimentary basins. The principle of this method is to use the Kaiser effect involving the acoustic emission (AE) of rock samples under a uniaxial load test. Based on the proposed method, the denudation thickness since the Late Cretaceous period in the southeastern margin of the Ordos Basin in China was estimated. The results showed that the denudation increased gradually from the northwest (1600 m a.s.l) to the southeast (1800 m a.s.l) of the study area. A comparison of the denudation results with those obtained from other methods illustrated that the AE method was reliable and easy to use. Finally, using computer simulation, we analyzed the influence of strata denudation and ground topography on the current in situ stress. The results suggested that due to the denudation, the horizontal stress played a dominant role in the distribution of the in situ stress of the study area, but the in situ stress could be reduced by the uplifted movement of the ground. The analysis could facilitate future applications of the AE method and improve understanding of the basin stress field.
Keyword ：
acoustic emission (AE) acoustic emission (AE) lateral pressure coefficient lateral pressure coefficient Ordos Basin Ordos Basin denudation reconstruction denudation reconstruction
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| GB/T 7714 | Wei, Siyu , Shang, Yanjun , Li, Yanyan . Application of Acoustic Emission to Estimation of Strata Denudation: A Case Study from the Ordos Basin, China [J]. | SUSTAINABILITY , 2019 , 11 (3) . |
| MLA | Wei, Siyu et al. "Application of Acoustic Emission to Estimation of Strata Denudation: A Case Study from the Ordos Basin, China" . | SUSTAINABILITY 11 . 3 (2019) . |
| APA | Wei, Siyu , Shang, Yanjun , Li, Yanyan . Application of Acoustic Emission to Estimation of Strata Denudation: A Case Study from the Ordos Basin, China . | SUSTAINABILITY , 2019 , 11 (3) . |
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Abstract ：
本发明公开一种人工填料最优级配确定方法，基于分形理论和最大密实度，通过引入级配参数，提出了在确定填石料总质量、最大粒径、可测得的最小粒径及小于可测最小粒径的填料质量后，根据本方法可确定一条级配曲线，该级配为连续级配并满足最大密实度，为该粒径范围内的最优级配。适用于土木工程粗粒土、巨粒土、岩石等作为填充物的最优级配计算。
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| GB/T 7714 | 张志红 , 杨凡 , 姚爱军 et al. 一种人工填料最优级配确定方法 : CN201910050815.3[P]. | 2019-01-20 . |
| MLA | 张志红 et al. "一种人工填料最优级配确定方法" : CN201910050815.3. | 2019-01-20 . |
| APA | 张志红 , 杨凡 , 姚爱军 , 李立云 , 李严严 . 一种人工填料最优级配确定方法 : CN201910050815.3. | 2019-01-20 . |
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