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通过单桩静荷载试验的Q–s曲线推算各级荷载下土体的等效弹性模量,建立单桩桩顶位移与等效弹性模量的函数关系,利用Mindlin位移解计算群桩相互作用,并引入一个修正弹性理论误差的经验公式来计算群桩的沉降。计算群桩沉降时认为土的等效弹性模量与单桩在相应沉降量下反演出的土体等效模量相等,以此将弹性理论的方法推广到塑性阶段。最后通过一个实例验证本文算法的可行性。
Based on the Q-s curve of single pile static load test, the equivalent elastic modulus of soils under different loads is deduced. The relationship between displacement and equivalent elastic modulus of single pile is established. The interaction between pile groups is calculated by Mindlin displacement solution , And introduce an empirical formula to correct the error of elastic theory to calculate the settlement of pile groups. When calculating the settlement of group pile, the equivalent elastic modulus of soil is considered to be equal to the equivalent modulus of soil mass under the corresponding settlement, so the method of elasticity theory is generalized to the plasticity stage. Finally, an example to verify the feasibility of this algorithm.