Analysis On Deformation Law Of A Foundation Pit Supporting System In Shenyang

Because of the complex soil conditions and groundwater conditions involved in the deep foundation pit engineering,the pit size and supporting forms are numerous,the above-mentioned unfavorable factors combined result in the deep excavation engineering deformation value is difficult to predict,It is necessary to study the deformation law of deep foundation pit engineering in Shenyang area.There are many factors influencing the deformation of deep foundation pit in typical sand region of Shenyang,including excavation depth,supporting form,anchoring structure arrangement,soil condition,groundwater condition and additional load.In this paper,considering the influence of conventional factors,two methods of field monitoring data and finite element numerical simulation are used to analyze the influence of space effect on the deformation of foundation pit engineering,compare the field monitoring data and national code to calculate the deformation results,and points out the deficiency of the specification in calculating the deformation of foundation pit engineering.This article focuses on the following issues:1.Combined with the deep foundation pit engineering example of Shenyang Financial Center,the monitoring data such as pile top displacement,surface subsidence and horizontal displacement of deep structure were collected,and the excavation depth,supporting form,Factors on the deformation of the foundation pit and the effect of the space effect on the structure and soil deformation in practical engineering.2.Contrast the monitoring data of the site and the calculation result of the deformation of supporting structure of Lizheng deep foundation design software,analyze the difference between the two,and point out the problems in the design calculation of the deep foundation pit in our country.3.The relevant theoretical knowledge of finite element analysis at home and abroad is collated.The Midas finite element analysis software is used to simulate the deep foundation pit of Shenyang Financial Center,and the parameter selection technique and structure simplification method of deep foundation pit in Shenyang area are analyzed.The results of numerical simulation of deep excavation are reasonable and reliable.4.The deformation of deep foundation pit of Shenyang Financial Center during the excavation process was simulated by Midas finite element analysis software.The horizontal displacement of the deep excavation,the deformation of the top of the pile and the settlement of the surface of the retaining wall were analyzed.The influence of flexural rigidity on the deformation of deep foundation pit is analyzed,and the influence of flexural rigidity of supporting structure on the deformation of deep foundation pit is analyzed.5.For the deep foundation pit near the subway tunnel in this special case,numerical simulation of the AA profile by Midas two-dimensional finite element analysis software,analyzes the slope with the structure of pile anchor retaining wall in subway tunnel under normal conditions and deformation,the deformation law of tunnel wall structure with lateral distance of the deep soil level and the variation of displacement in the excavation process of the subway.