Design And Numerical Simulation Analysis Of Foundation Pit Support Structure Based On HS Model

In recent years,China's economic construction has developed rapidly,and more and more people are seeking urban development.The existing urban buildings can not meet the needs of the growing urban population.There are more and more high-rise buildings and underground space projects have been developed,such as underground parking lot,underground shopping mall and subway,which greatly alleviate the pressure of the city.In the meantime,the foundation pit engineering develops in a deeper and wider direction.Deep foundation pit engineering has become a hot topie worthy of study by scholars at home and abroad.Deep foundation pit engineering is maiuly divided into two major steps:excavation and support.The selection of foundation pit support structure is more complex.It not only considers the geological and hydrological conditions of the site,but also considers the influence of the surrotnding environment.More importantly,although there are many forms of foundation pit support structure which are more secure,it also takes into account the restrictions of construction technology and equipment and the control of construction cost.This paper takes a deep foundation pit in Huainan as the research object carries out the design and numerical simulation analysis of the supporting structure of the foundation pit,and optimizes the construction steps and supporting parameters of the foundation pit by changing the parameters of the foundation pit.Specific research contents and conclusions are as follows:(1)By comparing and analyzing various supporting schemes,and combining with the supporting schemes of similar foundation pit projects in Huainan area,the pile-anchor supporting seheme suitable for thi5 project is selected.(2)For the reasonable selection of supporting parameters,geo5 software is used to calculate the embedded depth of piles,and the bending moment,shear force and horizontal displacement of piles under various construction conditions are calculated.The overall stability of the foundation pit is checked and calculated.The overall stability safety factor of the foundation pit is 2.5,greater than 1.35.The supporting parameters are reasonable.(3)By using Midas GTS software,HS geotechnical constitutive model is selected to simulate the construction conditions of foundation pit excavation,and the variation laws of intermal force and displacement of supporting structure and displacement of soil around foundation pit are obtained under different excavation conditions.(4)By changing the number of dewatering,the influence of dewatering on the stability of foundation pit is studied.Through comparative analysis,it is found that multiple dewatering of foundation pit is beneficial to the stability of foundation pit.The pile diameter is optimized to 1.6m and 1.4m,which can ensure the safety and reduce the construction cost.Figure 45 table 9 reference 53...