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学者姓名：李严严
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摘要 ：
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.
关键词 ：
In-situ stress In-situ stress Fracture Fracture Discrete fracture network Discrete fracture network Surrounding rock stability Surrounding rock stability
引用：
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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) . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
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.
关键词 ：
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 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
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.
关键词 ：
Rocks Rocks Fracture Fracture K-means clustering K-means clustering Computational complexity Computational complexity Rock mechanics Rock mechanics Groundwater Groundwater
引用：
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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 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
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.
关键词 ：
acoustic emission (AE) acoustic emission (AE) denudation reconstruction denudation reconstruction lateral pressure coefficient lateral pressure coefficient Ordos Basin Ordos Basin
引用：
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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) . |
| 导入链接 | NoteExpress RIS BibTex |
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