Engineering Geological Characteristics And Numerical Simulation Of Foundation Pit Support In Suqian Area

With the growth of China's economic development and the rapid development of urban construction,high-rise and super-high-rise buildings are also gradually increasing,which means that there are more and more deep foundation pit projects being built.At the same time,the "Deep Foundation Pit" project is a comprehensive project that requires consistent cooperation in engineering research,design,architecture and other fields,along with a lot of guidance and support from engineering theory.Due to the diversity of support structure of foundation pit engineering and the strict requirements of surrounding rock and soil medium,the theoretical design alone cannot fully guarantee the safety of foundation pit construction,combined with numerical simulation method,analyze the change of support structure stress and displacement and the displacement of surrounding rock and soil body,which plays an important role in verifying the foundation pit stability and the rationality of support structure.Based on the basis of regional geotechnical data and analysis,multiple linear regression analysis of the indexes of silt and silty clay in the Quaternary stratum in the study area can guide the selection of the indexes and the coefficient of variation of soil index for the foundation pit support and foundation design in Suqian area.The author used the finite element software to analyze the rules of the displacement and stress change of the support structure during the construction: the horizontal displacement maximum of the support structure after the foundation pit excavation is at the top of the support structure,and the horizontal displacement gradually decreases;the horizontal displacement and vertical surface soil displacement decrease significantly with the increasing distance from the foundation pit.The results of the finite element software simulation agree with the change law of the engineering detection value,verifying the rationality of the support structure design and the applicability of the SMW engineering support in the project.