超前支护桩加固高切坡的静动力响应与永久位移预测研究

在西部山区的城镇化建设中,常因土地资源稀缺而不得不利用坡地资源.然而如果不当切坡,就可能引发其失稳滑塌,给工程建设和人民生命财产造成重大危害.为此,以极限分析的上限定理为手段,分析了不同切坡方式和不同土体抗剪强度对高切坡稳定性的影响.并基于超前支护理论,研究了危险高切坡的超前支护方案,给出了超前支护桩的抗力荷载的计算方法.最后,在考虑有地震荷载作用的条件下,分析了高切坡超前支护体系发生永久位移的临界加速度条件和永久位移大小,最终为高切坡超前诊断与支护设计提供一个完备的解决方案.

Static-Dynamic response and permanent displacement forecast for high cutting slope pre-reinforced by pile

The slopes in western mountains are used to be developed into the infrastructure construction for the scarcity of land resources. However, it usually lead to collapse and causes great damage for improper cut slope. Here based on the upper bound theorem of limit analysis, the stability of cutting slope with different shear index under different cutting way was studied. Then according to the pre-reinforced technology for cutting slope, the design of pre-reinforced pile to stabilize high cutting slope is studied while the design load is also proposed. Finally, the minimum yield acceleration which can result into the permanent displacement and the permanent displacement of advanced support system under earthquake is researched. In short, the whole studies provide a scientific method for pre-reinforced technology of high cutting slope.