Analysis Of Construction Stress And Deformation Of Foundation Pit Support

In recent years,society and economy in China were developing rapidly,traffic demand was increasing rapidly,urban underground space was developed and constructed rapidly,therefore,foundation pit engineering is widely used.At the same time,due to complex geological conditions,the foundation was dug deeper and deeper,to accommodate the needs of urban planning,design and construction quality can not be fully guaranteed,resulting in many excavation pit accident.Therefore,it is an urgent task to analyze the stress and deformation in the process of foundation pit support and deepen the research.Based on the foundation pit engineering of Fuzhou senile Sports Center,determine pit site of each layer soil parameters through soil test,and conduct numerical simulation according to these parameters of foundation pit.At the same time,monitor and measure the foundation pit construction process,compare numerical simulation and monitor results,to get a more accurate results and can be used to guide the construction of the foundation pit project.The main work and conclusions of this paper are as follows:1、Based on Fuzhou senile Sports Center Foundation Pit Engineering,by means of preparation around the soil samples,soil test arrangement,soil samples of various soil are the basic physical property tests,one-dimensional consolidation compression tests and triaxial compression test,the physical and mechanical parameters of each soil layer.The results of this paper can provide reference for other similar excavation engineering,and also provide the basic data for the subsequent three-dimensional numerical simulation.2、FLAC3D numerical simulation software was used to analyze the foundation pit construction process of the old sports center in Fuzhou city.Model considering the surrounding complex formation conditions,using the parameters obtained from the soil test,foundation pit using actual retaining wall structure and complex supporting system,and according to the first support after excavation in order to achieve the simulation of the construction site.The numerical simulation mainly considers the deformation of the retaining wall,the surface settlement and the support force,and the numerical simulation is obtained under the conditions of the numerical simulation curve.3、The application level meter,total station instrument,measuring inclinometer monitoring instruments,the establishment of reasonable monitoring network and monitoring points,the reasonable control of operating frequency,Fuzhou City sports activities of old people center foundation pit engineering construction process of deep horizontal displacement,the surrounding buildings and ground settlement and foundation pit support internal force of construction dynamic monitor.At the same time,the monitoring results and the numerical simulations are compared.The results of the comparison show that although there are some differences between the results of numerical calculation results with the field measurements,but the difference is small and the distribution form of close,obtained from the numerical calculation results and field measured results can better agreement,therefore the parameter selection reasonable under the premise,the results of numerical simulation can reflect the actual construction of the results.And the two method combined with operation can reflect the actual situation,the other is of guiding significance to the actual construction.