工程地质学报2025，Vol.33Issue(6)：2138-2146,9.DOI:10.13544/j.cnki.jeg.2025-0380
顺向边坡泥质夹层结构面剪切力学特性试验研究
EXPERIMENTAL STUDY ON SHEAR MECHANICAL PROPERTIES OF ROCK BEDDING SLOPE WITH MUDDY INTERLAYER STRUCTURAL PLANE
摘要
Abstract
The reduction in shear strength of muddy interlayer structural planes under hydro-mechanical coupling is a key factor contributing to the instability of rock bedding slopes.In this study,natural specimens of muddy interlayer structural planes from bedding slopes were used to conduct shear failure and shear strength tests under both saturated and unsaturated conditions.The contributions of shear resistance from surface protrusions and frictional resistance from the structural plane were quantitatively separated within the overall shear strength.This approach clarified the failure mechanism of muddy interlayer structural planes under coupled moisture-loading effects and led to the development of a corresponding shear mechanical model.The results indicate that:(1)For natural muddy interlayer structural planes,the shear stress-displacement curves primarily exhibit three stages:elastic deformation,plastic deformation,and a stable residual stage.(2)Under low normal stress,fracture surfaces remain relatively rough,with some fine protrusions remaining intact;under high normal stress,surfaces become smoother as failure progresses through crack initiation at the base of protrusions,followed by crack propagation and complete shearing.(3)In natural structural planes,shear failure specimens showed a 2.56％higher friction coefficient and 11.46％higher cohesion compared to specimens subjected to direct shear.Under saturated conditions,shear failure specimens exhibited a 3.38％higher friction coefficient and 82.29％higher cohesion.(4)The proposed shear failure and shear resistance models enable estimation of the overall shear performance of concave-convex structural planes with muddy interlayers based on the strength parameters of flat structural planes.关键词
顺向岩质边坡/滑坡/结构面/力学特性/抗剪强度/灾变机制Key words
Rock bedding slope/Landslide/Structural plane/Mechanical properties/Shear strength/Catastrophic mechanism分类
天文与地球科学引用本文复制引用
金志豪,张涛,吴勇进,胡伟,朱杰兵,卢波,朱瑜劼..顺向边坡泥质夹层结构面剪切力学特性试验研究[J].工程地质学报,2025,33(6):2138-2146,9.基金项目
国家自然科学基金项目(资助号:42277186,U2340226),中央级公益性科研院所基本科研业务费专项资金资助项目(资助号:CKSF2025719/YT,CKSF20241016/YT,CKSF20241014/YT).This research is supported by the National Natural Science Foundation of China(Grant Nos.42277186,U2340226)and the Fundamental Research Funds for Central Public Welfare Research Institutes(Grant Nos.CKSF2025719/YT,CKSF20241016/YT,CKSF20241014/YT). （资助号:42277186,U2340226）
