基于强度折减法的韩城煤矿边坡稳定性分析

将有限元强度折减理论应用于边坡稳定性分析中，运用ANSYS大型有限元分析软件，基于Drucker-Prager（D-P）屈服准则，采用力和位移的收敛标准作为破坏判据，进行边坡的稳定性分析。当折减系数达到某一数值时，非线性有限元静力计算将不收敛，滑面上的位移将产生突变，边坡内一定幅值的广义剪应变自坡底向坡顶贯通，此时认为边坡已破坏，并定义此时的折减系数即为稳定系数。文中以韩城煤矿节理岩质边坡为例，运用该方法进行了稳定性分析并与并与传统的Bishop法、Janbu法等方法对比。计算结果表明，有限元强度折减法能更加真实地反映边坡的实际情况，求得的边坡稳定系数更接近边坡的实际稳定状态，显示出其在边坡稳定性分析中的一定优势。

Stability Analysis of Slope in Hancheng Coal Mine Base on Strength-Reduction Method

The finite element c-tanФ reduction theory is applied to the slope stability analysis, which is using ANSYS finite element analysis software, based on Drucker-Prager yield criterion, using force and displacement convergence criteria as the damage criterion to carry out the slope stability analysis. When the reduction coefficient reaches to a certain value, the non-linear finite element calculation will not converge, the displacement of the sliding surface will mutation, slope, within a certain amplitude of the generalized shear strain gradient from its base to the top, so the slope had been destroyed, the previous reduction factor shall be the stability factor. In the paper, taking the Hancheng coal jointed rock slope for example, applying the c-tanФ, reduction theory to its stability analysis. The results show that the FEM and strength - reduction method is more convenient and reasonable in the analysis of rock slope stability. It can reflect the actual slope state, and give stability factors that are closer to the actual ones.