复杂受力状态下岩体抗滑移空间稳定性分析

Stability Analysis of Cable Bridge Anchorage in Rock Masses

岩体失稳的临界滑动面的形状在具体工程中往往较难确定 ,一般的方法仅从平面上来考虑滑动面形状 ,现在三维弹塑性有限元计算基础上引入动态规划理论来解决在复杂受力状态下岩体的总体稳定性分析 ,确定各个剖面的滑面形状 ,从而判断总体空间滑面的形状 .采用有限元与动态规划相结合的方法 ,可以在不同工期分别计算岩体的稳定性 。

In the paper, FEM is used to calculate actual stress and allowable stress of an anchorage of cable bridge and then to estimate the probable location of its critical slip surface. In fact, Dynamic Programming is employed to locate the critical slip surface. The method is applied to practical anchorage engineering successfully. Through the stability analysis at several cross sections of the area, the shape of slip surface can be estimated in 3-D space. The method has the advantage over limit equilibrium methods that the stability assessment of each staged construction can be correctly obtained.