裂隙岩质高边坡开挖加固施工稳定性有限元分析

Finite Element Analysis of Stability of Excavation Reinforcement Construction for High Fracture Rock Slope

以重庆市金佛山水利工程取水口裂隙岩质高边坡为例,从边坡形态规模、变形破坏机理及安全性的角度,结合开挖加固过程中的位移、潜在滑动面、剪应变等的变化,研究了裂隙岩质高边坡在分级开挖、边开挖边加固施工过程中的岩体变形及其稳定性。结果表明,边坡在分级开挖、加固施工过程中的整体安全性及边坡位移满足《水利水电工程边坡施工技术规范》要求;加固完成后边坡的可能破坏形式为深层滑动,滑弧上部为拉裂段、中部为直线段,坡脚为圆弧段;第一级开挖后边坡顶部位移发生突变,但在接下来的施工过程中变形逐渐趋于稳定;加固后边坡安全系数明显提高,边坡整体是稳定的。

Taking water intake of Jinfoshan hydraulic engineering for an example, combined with the change of displacement, potential sliding surface and shear strain, the deformation and stability of high fracture rock slope in the construction of stepped excavation and reinforcement are studied from aspects of slope＇s size and shape, failure mechanism and stability. The results show that in the construction of stepped excavation and strengthening, the safety factor and deformation of slope meet the technical specification for construction of water resources and hydropower engineering slope; it may become a deep and composite mechanism of the potential landslide; sliding surface is divided into tensile splitting segment, straight line and circular section; the displacement of top slope appears sudden change after the first excavation, then it gradually becomes stable while the followed construction; the stability of rock slope is improved obviously after strengthened.