深基坑排桩预应力锚杆支护工程中,作用于桩身的土压力与桩身位移呈非线性变化。对于这种非线性变化问题,基于位移土压力模型,考虑支护结构位移的影响,推导了混合法计算公式。混合法可以有效跟踪支护结构的变形过程,反映土体与桩之间的非线性作用关系。结合工程实例,编制了MATLAB计算程序,计算结果较好地反映了土压力与桩身位移之间的非线性变化关系,并与理正软件计算结果进行对比分析,结果表明两者吻合较好,从而证明该计算方法具有较好的适用性,对深基坑支护结构设计有较好的参考价值。 In the deep foundation pit piles prestressed bolt supporting project, the soil pressure acting on the pile body and the pile body displacement present a nonlinear change. For this kind of nonlinear change problem, based on the displacement earth pressure model, considering the influence of the displacement of supporting structure, the formula of mixing method is deduced. The hybrid method can effectively track the deformation process of the supporting structure and reflect the nonlinear interaction between soil and pile. Combined with the engineering example, the MATLAB program was compiled. The calculated results better reflect the nonlinear variation between the earth pressure and the pile displacement, and compared with the calculation results of the Li Zheng software. The results show that the two agree well, It is proved that the method has good applicability and good reference value for the design of deep foundation pit supporting structure.