基于FLAC^(3D)的边坡单元安全度分析及应用

Analysis of Zone Safety Degree of Slopes and Its Application Based on FLAC^(3D)

为改进传统边坡稳定分析中安全系数的定义不适合于具有多个坡面的复杂边坡的缺陷,引入静载强度分析中对点安全系数的定义,结合FLAC3D数值模型,提出了边坡单元安全度的概念.采用FLAC3D内嵌编程语言FISH编写了单元安全度的计算模块,得到了边坡各单元安全度的分布.采用这种方法对平朔安家岭露天煤矿边坡下的井工开采进行了数值模拟.结果表明:在井工开采影响下,露天煤矿边坡可能会出现"圆弧-顺层"的滑坡模式;在开切眼附近坡体地表形成大范围的拉破坏区,单元安全度小于1的地方均位于坡体台阶受拉处,最小单元安全度为0.88,出现在南端帮边坡;井工开切眼位置应远离边坡体.

The concept of zone safety degree was described based on a FLAC^3D numerical model and the definition of point safety factor in static load strength analysis. A calculation module for the zone safety degree of the slope was programmed using the programming language ＂ FISH＂ available with FLAC^3D. The distribution of zones safety degree was obtained. Numerical simulation was carried out for underground mining under the slopes of the Anjialing Open Colliery in Pingshuo. The results show that an ＂arc-bedding＂ slide mode of the slope, influenced by underground mining, may occur. A large range in surface tension forms nearby an underground open off cut. The minimum zone safety degree is 0.88 at the south slope. The open off cut should be far away from the slope horizontally for slope stabilization.