A Study on Obligating Width of Soil Slope Shoulder in Basin Opening for Top-down Construction Method

The top-down construction method is an effective method.For in the course of building,if rational soil width is remained beside the diaphragm walls in top-down construction method,the excavation efficiency of machine can be improved,the excavation quantity of manpower reduced,the opening speed expedited,and the distortion of diaphragm walls can be controlled effectively.In this paper,the method of calculating the obligating width of soil slope shoulder by controlling distortion is introduced to study different obligating width of soil slope shoulder in Chang Feng shopping center through 3D FEM method.Results show that adding obligating width of soil can reduce level distortion of diaphragm walls evidently,but the effect of reducing the level distortion of diaphragm walls will be unconspicuous when the obligating width of soil is increased to definite value.Thus,an effective analytic way is provided for the calculation of obligating width of soil slope shoulder beside diaphragm walls in top-down construction method.