多组节理边坡稳定性FLAC3D数值分析

The Numerical Analysis on the Stability of Slope with Several Sets of Joints by FLAC3D

边坡稳定性对工程安全构成直接的威胁,对多组节理且较发育的岩体边坡稳定性安全评价,利用赤平投影方法能比较好地反映不稳定结面与边坡的几何空间关系、不稳定结构体的可能变形位移方向,为FLAC3D数值计算模型的建立提供依据。以某公路段岩体节理边坡稳定性安全评价为研究对象,通过赤平投影和FLAC3D数值计算模型稳定性分析表明,A1,J1节理组对边坡稳定性影响极大;A3,J1,A3,J2与A1,J1组节理构成贯通结构面,边坡不稳定体为两组结构面切割形成的滑体,边坡安全系数为0.67,需要支护加固。该方法对复杂节理边坡稳定性安全评价比较好地避免了采用工程经验建立数值计算模型的盲目性。

The stability of slope has a great influence on the safety of engineering. The safety analysis on the stability of rock jointed slope is made in this paper. The method of stereographic projection can reflect not only the geometric relationship between instable structure plane and rock slope with several sets of joints, but also the deformation direction of instable structure body. This method provides a foundation for the establishment of numerical simulation model by FLAC3D （Fast Lagrangian Analysis of Continua in Three-dimensions）. This paper takes the rock jointed slope of one road as an example; an analysis is made by method of stereographic projection and FLAC3D. The result of this analysis shows that A1 ,J1 joint has a great influence on the stability of slope. The joint sets of A3 ,J1 ,A3 ,J2 and A1 ,J1 constitute structural surface that links up, the unstable slope is the slipped body caused by the cutting of two sets of structure planes, which poses a great threat to the stability of slope. The safety factor of slope is 0. 67, so the slope should be reinforced. The method adopted can reduce the blindness in building the numerical calculation model with experience.