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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。
The basic assumption of the traditional residual thrust method is only applicable to ideal plastic or strain hardening materials, and its applicability to slopes with strain softening properties is limited. Based on the strain softening properties of soil, the corresponding relationship between shear strain and shear capacity was discussed. By introducing the strain coordination equation at the bottom of the bar, the calculation method of the thrust of the landslide bar is improved. A new method of thrust calculation of landslide anti-slide piles considering the strain softening characteristics is proposed. The case study shows that the current stability coefficient of the landslide calculated by the improved method is between the values obtained from the peak strength and the residual strength respectively. The obtained thrust force of the anti-slide pile is smaller than the residual strength, The value of strength calculation is large, ranging from the two. The design thrust calculation that can consider the strain softening property of soil is based on the current status of the landslide, which not only can play a role of deterring the further development of the landslide in time, but also more in line with the actual conditions of the slope .