超大异形深基坑地下连续墙变形和力学响应分析OA

In order to reveal the deformation and stress evolution law of the diaphragm wall in a super-large special-shaped deep foundation pit under complex geometric shape,and enrich the theoretical basis,field tests were carried out on the key parts of a deep foundation pit.The results show that the maximum displacement of the irregular section is significantly higher than that of the standard section,while the displacement in the internal corner is the smallest.The soil pressure behind the wall is between the static and active limit states,and the formula for calculating the non-limit state active soil pressure is derived.The distribution of reinforcement stress and bending moment are in an"S"shape,and the maximum stress and bending moment occur near the excavation face.The concrete stress changes in a"C"shape with the depth,the maximum concrete stress occurs near the excavation face,and the maximum stress in the special section is 1.5 times that of the standard section.The study reveales the influence mechanism of internal corner effect and spatial effect on the mechanical response of diaphragm walls in super-large special-shaped deep foundation pits.The established non limit state active soil pressure calculation formula has practicality and can provide scientific basis for the design and deformation control of similar projects.