公路缓倾互层岩质边坡失稳数值模拟研究

Numerical Simulation Study on Instability of Rock Slope with Gently Tilting Interlayer of Highway

本文在前人研究的基础上,论述缓倾软硬互层岩质边坡主要在自重、风化作用、溶蚀作用及软弱夹层软化作用下形成危岩体,危岩体主要受软弱基座和断续延伸的外倾结构面控制;斜坡受灰岩岩溶发育的影响较大,灰岩的力学强度呈现不同强度的降低,是崩塌的易发岩组;综合各个内在及外在因素采用工程地质过程机制分析法,得出该边坡危岩体破坏模式为倾倒式破坏;危岩体演化过程中斜坡岩体内部裂隙的发展方向是自下而上的,且随着变形的发展,在软弱夹层处出现向坡体外部的塑性变形。

Based on the previous studies, the paper discusses that the soft-hard interbedded rock slopes with gentle-dip tend to form dangerous rock mass under the influences of self-weight, weathering, dissolution and softening of weak interbed. The rock mass is mainly affected by weak base and intermittent extension of the camber structure control. The slope is greatly affected by limestone karst development, and the mechanical strength of the limestone shows a decrease in strength. According to the inherent and extrinsic factors, the method of engineering geological process mechanism analysis is used to conclude that the failure mode of the dangerous rock mass in the slope is dumping failure. During the evolution of dangerous rock mass, the development direction of cracks inside the slope rock mass is bottom-up. With the development of deformation, the plastic deformation to the outside of the slope body occurs at the weak interlayer.