关键词: 深基坑, 位移土压力, 混合法, 非线性

Abstract: In the project of deep excavation pit supported by piles with prestressed anchors, the soil pressures acting on the pile and pile body displacement are nonlinearly changed. For the nonlinear change issue, based on displacement soil pressure model, considering the influence of the displacement of supporting structure, a calculation formula of mixing method is derived. The mixing method can effectively track the deformation process of supporting structure, and reflect the nonlinear function relationship between soil and the pile. Combining with the engineering practice, the MATLAB program is compiled; the nonlinear relationship between earth pressure and pile body displacement is well reflected by the calculation results; the calculated results are analytically compared with Lizheng software. It is shown that they can anastomose each other well so as to prove that, this calculation method has wide applicability and a good reference value for deep excavation pit supporting structure design.

Key words: deep excavation, displacement earth pressure, mixing method, nonlinearity