Exploring failure evolution of anti-dip slate slope using centrifuge test and discrete element method

IF 3.7 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL Bulletin of Engineering Geology and the Environment Pub Date : 2024-10-25 DOI:10.1007/s10064-024-03972-8

Meng-Chia Weng, Chia-Hsun Peng, Wen-Yi Hung, Yu-Jiun Guo

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Abstract

Toppling failure commonly occurs in anti-dip slate slopes due to foliation splitting and gravitational deformation. The study uses centrifuge tests and the discrete element method (DEM) to investigate the influence of foliation and existing fractures on the toppling failure evolution of anti-dip slopes. Six centrifuge tests with slate blocks obtained from an actual slope were carried out. Then, a proposed foliation model was implemented in the DEM software 3DEC to simulate the failure evolution of anti-dip slopes. The 3DEC analysis was validated by the actual failure pattern of slopes in centrifuge tests. The results indicate that the toppling failure of the anti-dip slope was initiated by existing fractures rather than the original cohesive foliation. Though the slate foliation is regarded as a weak plane in the rock mass, it retains a higher strength than the existing fracture, so the toppling failure is difficult to initiate from the cohesive foliation. The closer the fracture is to the free surface, the more pronounced the damage. In addition, the simulation indicates that the existing fracture's position also affects the anti-dip slope's failure degree. The fractures on the top propagate more easily than those on the bottom.

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利用离心机试验和离散元法探索抗倾覆板岩斜坡的破坏演变过程

由于褶皱分裂和重力变形，反倾角板岩斜坡通常会发生倾覆破坏。本研究利用离心机试验和离散元素法（DEM）研究了褶皱和现有断裂对反倾角斜坡倾覆破坏演化的影响。利用从实际斜坡中获得的板岩块进行了六次离心试验。然后，在 DEM 软件 3DEC 中实施了建议的褶皱模型，以模拟反斜坡的破坏演变。离心试验中斜坡的实际破坏模式验证了 3DEC 分析。结果表明，反斜坡的倾覆破坏是由现有的断裂而不是原始的粘聚褶皱引发的。虽然板岩褶皱被认为是岩体中的薄弱面，但它的强度高于现有的断裂，因此倾覆破坏很难从内聚褶皱开始。断裂越接近自由表面，破坏越明显。此外，模拟结果表明，现有断裂的位置也会影响反斜坡的破坏程度。顶部的断裂比底部的断裂更容易扩展。

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来源期刊

Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合

CiteScore

7.10

自引率

11.90%

发文量

445

审稿时长

4.1 months

期刊介绍： Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.