Step-path failure of the rock slopes with large intersection angles between the strikes of strata and surface:a case study  

作　　者：ZHANG Juehao HUANG Da LI Zhao GUO Zizheng SONG Yixiang XIAO Huabo 

机构地区：[1]School of Civil and Transportation Engineering,Hebei University of Technology,Tianjin 300401,China [2]College of Geology Engineering and Geomatics,Chang'an University,Xi'an 710064,China [3]Power China Chengdu Engineering Corporation Limited,Chengdu 610072,China

出　　处：《Journal of Mountain Science》2025年第3期931-949,共19页山地科学学报(英文)

基　　金：supported by the National Natural Science Foundation of China(No.U23A2047,No.42277187,No.42307248);Natural Science Foundation of Hebei Province(No.D2022202005)。

摘　　要：Rock slopes with large intersection angles between the strikes of strata and surface(RS-LISS)represent a unique type of layered rock slope.These slopes are usually considered to be well stabilized and less prone to landslides.However,when such slopes contain a significant number of discontinuities,their stability is greatly weakened.This study provided innovative insights into the stability of RS-LISS and conducted an in-depth investigation of their step-path failure mechanisms.The Riyi landslide on the eastern margin of the Qinghai-Tibet Plateau,China,was taken as a typical case and detailed investigations of geological structure and deformation characteristics of the slope were conducted by means of slope mapping,core drilling,and exploratory adits.A large number of steep-dip and gentle-dip joints were discovered in the slope,along with several critical discontinuities such as faults.Analysis shows that the tectonic stresses and river downcutting over geological time played significant roles in the formation of these discontinuities.Based on the investigation results,a numerical model of DFN for the Riyi landslide was developed.The simulation results indicated that the slope could develop a sliding surface characterized by a steep back and a gentle base,formed through the stepped interconnection of various discontinuities.Additionally,the deformation of the rock mass mainly originated from the major fault,progressively extending downward.The sliding mass may slide suddenly as a whole along the stepped bottom surface,with the compressional fracture zones as lateral boundaries,presenting a"drawer-like"movement towards the free surface.

关 键 词：Layered rock slope Step-path failure Slope structure Numerical modeling Failure mechanism 

分 类 号：TU457[建筑科学—岩土工程]