临界滑动场技术在排土场边坡设计中的应用

APPLICATION OF CRITICAL SLIDING FIELD ALGORITHM IN SLOPE DESIGN OF WASTE-DUMP FOR LONGQIAO MINE

边坡临界滑动场技术是近年发展起来的一种边坡稳定性分析方法。它能准确快速确定多层介质、多台阶边坡任意形状的临界滑动面,全面评价边坡整体和局部稳定性。文章首先应用临界滑动场技术对原设计15°坡角时的龙桥排土场边坡进行临界滑动面搜寻,确定边坡整体安全系数为1.42,证明原设计的15°坡角取值过于保守。然后再应用临界滑动场技术的扩展方法进行反向分析,在给定安全系数为1.30的条件下,求得最佳设计坡角为17°。研究成果为将来矿山的排土工作提供指导,具有一定的工程实用性。

Slope critical sliding field algorithm is a new method in slope stability analysis. It can quickly and accurately determine the arbitrary shape of critical sliding surface of multi - layer and multi - step slopes, and give an overall evaluation of the global and local stability of slope. This paper firstly uses the critical sliding field algorithm to probe the sliding surface of Longqiao waste - dump slope with the original design of 15° slope angle. The global safety factor of slope is found to be 1.42. The results show that the original design of 15° slope angle is too conser- vative. Then the expending method of the critical sliding field algorithm is used to carry out the reverse analysis. Given safety factor of 1.30, the optimum slope angle is found to be 17°. The results can be used to supervise the future dumping work of mines.