考虑土体应变软化特性的滑坡抗滑桩设计推力研究

传统剩余推力方法的基本假设仅适用于理想塑性材料或应变硬化材料，对具有应变软化特性的坡体其适用性受到限制。基于土体的应变软化性质，探讨了其剪应变和抗剪能力的对应关系。通过引入条块底部的应变协调方程，对滑坡条块推力计算方法进行改进，提出了考虑应变软化特性的滑坡抗滑桩设计推力计算新方法。实例分析表明，改进的方法计算得到的滑坡当前稳定性系数介于分别取峰值强度和残余强度所获的结果之间；所得的抗滑桩设计推力值相较残余强度算得的值小，较峰值强度算得的值大，介于两者之间；能考虑土体应变软化特性的设计推力计算是依据滑坡当前状态进行，既能够起到及时遏制滑坡进一步发展的作用，又比较符合坡体实际情况。

A method for designed thrust of anti-slide pile considering strain softening properties of soil

The basic hypothesis of residual thrust method is only suitable for perfect-plastic materials or strain-hardening materials. For the slope with strain softening properties, the applicability of this method will be limited. This paper based on the strain softening properties of soil aims to explore the relationship between shear strain and the shear capacity, by introducing equations of strain compatibility at the bottom of the bars, the method for landslide thrust calculation is improved; and then a new method for calculating designed thrust of anti-slide pile considering strain softening properties is proposed. The case studies show that the coefficient of landslide stability calculated by improved calculation method is between the values respectively computed on the condition of peak strength and residual strength; and the designed thrust of anti-slide pile obtained by improved method is much lower than that obtained by residual strength, but is higher than that obtained by peak strength, is between the two sides all the same. The method proposed is based on the current status of the landslide; so it can curb the further development of the landslide and also conform to the actual situation of the slope at present.