考虑层间作用的多层滑坡分析方法

对于发育多层滑面的复杂滑坡,工程中较少考虑各滑面之间的相互影响,而所提出的分层计算方法,考虑了各滑面之间的相互影响。各层分别核算其滑坡稳定性,抗滑结构物设计中的滑坡推力及其分布形式。上层滑体按照一般的传递系数法计算,下层滑体按照考虑上层滑体在上层滑面处的作用力传递系数法计算。算例分析表明,分层计算方法将使多层滑面的复杂滑坡抗滑结构物的设计更为合理。

A NEW METHOD CONSIDERING INTER-LAYER INTERACTIONS FOR ANALYSIS OF MULTI-LAYERS LANDSLIDES

There are complex landslides with several layers of slipping plane in the geotechnical engineering. In this paper,a new method to analysis the multi-layers landslide is presented. Every layer of sliding masses when calculating the slope stability and landslide-thrust distribution is analyzed. The upper layer of the sliding mass is analysed by using the common transfer coefficient method. When the lower layers of the sliding masses are analysed,the weight of the upper layer but the effects of the upper mass on the layer below can be ignored. The method was applied to a practical project,and the results show:(1) the safety factor of the slope calculated by the new method is with the same as the general method;(2) because the anti-sliding pile intercepts the sliding mass, the landslide thrusts of different layers of sliding mass act on the pile separately. Therefore,the total landslide thrust is varied with different methods;(3) when the upper sliding mass has different design safety factors,the landslide-thrust of the upper mass and the total landslide-thrust are different. The calculated results by the new method make the design of anti-sliding structures more reasonable.