黄土边坡稳定性计算方法研究

Studyon the computingmethod for the stabilityof the loess slope

目的目前对于多土层、多台阶的边坡进行稳定性分析时,大多对土性参数、坡率进行加权平均来对边坡进行稳定性分析,没有考虑到大部分坡顶都有一定倾斜,这必然会产生一定的误差。为了克服这些问题,我们对边坡作进一步的研究。方法考虑边坡土体分层情况、坡顶坡率、防护力的大小(无防护时为零)及作用点高度,做出边坡的受力模型图,求导出能够反映黄土边坡实际情况的稳定性表达式。结果通过对该方法求导的稳定性表达式进行计算机VB编程,能够简单方便的求解出边坡的稳定性状况及间接求导出使边坡达到稳定时所需防护力。结论该方法取代对坡体土性加权平均,考虑了不同土层的情况,同时考虑坡顶倾斜的情况来对边坡进行稳定性分析,所得结果能够进一步接近黄土边坡的实际情况。

Objective-To overcome such problems as some errors made by not taking into account of the certain inclination of the top of the slope while the stability of slopes is analyzed with weighted average of most soil parameters and slope ratio during the stability analysis of the multi-soil layer and multi-step slope. Methods-By considering the situation of the soil stratification of slope, the ratio of the top of slope, the size of the defense force （it is zero without protection） and the height of action point, the force model diagram of a slope is made, and a stability expression to reflect the actual situa-tion of the loess slope is obtained. Results-It is easy and convenient to find the slope stability and in- directly determine the defense force to stabilize the slop by computer VB programming through the stability of the obtained expression. Conclusion-By taking into account of the different soil and the tilt of the top of a slope, this method can replace the weighted average of the soil in a slope, Mean-while, from the slope stability analysis, the results is closer to the actual situation of the loess slope.