Simulation of Stage Excavation and Stability Analysis for Stratified Rock Slope

摘要

The slope stage excavation process is: (i) excavating the first part of the slope rock and exerting rock bolting and concrete shotcrete layer (ii) excavating the second part and exerting the second layer rock bolting and concrete shot-crete layer. The next construction process is the same as the upper step. In this article, the bolting is simulated with onedimension axial bar, the joint is simulation by no thickness Goodman element, the effect of blasting is calculated using dynamic stress method, the slope stability safety factor derives from using elastoplastic finite element method of lowing material's strength. The simulation of stage excavation of the stratified rock slope is carried out, considering unloading effect of excavation. These functions are realized by my own finite element program. This program is applied to the K135 slope of ChangZhang highway. The stresses and displacements of K135 slope for every excavation step are analyzed and the safety factors are gotten. The slope's stability is evaluated and some suggestions are proposed for improving and strengthening the slope. The analysis result shows the K135 slope is stability in the process of construction.