Vol16 No.9: 2184-2202
【Title】Evaluation of mountain slope stability considering the impact of geological interfaces using discrete fractures model
【Author】WANG Lu-yu1,2; CHEN Wei-zhong1,3*; TAN Xu-yan1,2; TAN Xian-jun1; YUAN Jing-qiang1; LIU Qi1,2
【Addresses】1 State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2 University of Chinese Academy of Science, Beijing 100049, China; 3 Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan 250100, China
【Corresponding author】CHEN Wei-zhong
【Citation】Wang LY, Chen WZ, Tan XY, et al. (2019) Evaluation of mountain slope stability considering the impact of geological interfaces using discrete fractures model. Journal of Mountain Science 16(9). https://doi.org/10.1007/s11629-019-5527-3
【Abstract】The stability of rock slope is often controlled by the existing discontinuous surfaces, such as discrete fractures, which are ubiquitously distributing in a geological medium. In contrast with the traditional approaches used in soil slope with a continuous assumption, the simulation methods of jointed rock slope are different from that of in soil slope. This paper presents a study on jointed rock slope stability using the proposed discontinuous approach, which considers the effects of discrete fractures. Comparing with traditional methods to model fractures in an implicit way, the presented approach provides a method to simulate fractures in an explicit way, where grids between rock matrix and fractures are independent. To complete geometric components generation and mesh partition for the model, the corresponding algorithms were devised. To evaluate the stability state of rock slope quantitatively, the strength reduction method was integrated into our analysis framework. A benchmark example was used to verify the validation of the approach. A jointed rock slope, which contains natural fractures, was selected as a case study and was simulated regarding the workflow of our framework. It was set up in the light of the geological condition of the site. Slope stability was evaluated under different loading conditions with various fracture patterns. Numerical results show that fractures have significant contributions to slope stability, and different fracture patterns would lead to different shapes of the slip surface. The devised method has the ability to calculate a non-circular slip surface, which is different from a circular slip surface obtained by classical methods.
【Keywords】Rock slope stability; Discrete fractures; Discontinuous approach; Equivalent model; Slip surface