节理岩质边坡稳定性分析及其工程应用

Stability analysis of jointed rock slope and its engineering applications

采用有限单元法对含节理岩质边坡进行应力应变及稳定性分析,得到边坡岩体的应力分布及变形特征;通过强度折减,得到边坡的稳定安全系数以及可能的最危险滑动面;了解边坡破坏的主要控制因素及破坏过程.以某水电站坝轴线处岩质高边坡为例,采用有限单元法对边坡进行了稳定性分析.结果表明:对于含节理的岩质边坡,有限单元法可以分别研究岩块和节理的屈服情况,为分析边坡可能发生的破坏形式及破坏过程提供依据;通过工程实例验证了有限单元法在节理岩质边坡稳定性分析中的可行性.对于大型工程的含节理岩质高边坡,采用有限单元法分析其稳定性,并与刚体极限平衡方法的计算结果进行对比,能够更好地反映边坡的变形及稳定状态.本研究成果对类似边坡工程具有一定的借鉴作用.

Using the finite element method to analyze the stability and stress-strain of the jointed rock slope, the stress distribution and deformation characteristics of the slope can be obtained. Also, the safety factor of the slope is calculated based on the strength reduction method, from which the possibly most dangerous sliding surface during the destruction, the main controlling factor of failure and the fracturing process can be informed. This paper analyzes the stability of the high rock slope on dam axis of a hydro- power station by finite element method as an example. It is shown that for jointed rock slope, the finite element method can respectively study the rock and jointed yield conditions to get the possible failure modes and failure process of the slope; from the example it is verified that the finite element method is feasible. For the jointed rock slope of large projects, it can be better applied to actual ones using the finite element method, compared with the results from rigid body limit equilibrium methods to analyze the stability characteristics of the slope. These results could be references for construction and design of similar projects.