Analysis Of The Effection Of The Excavation Of Deep Foundation Pit On Its Surrounding Environment

Since the reform and opening up,with the rapid development of economy,the scarcity of land resources in the city and urban land makes the city building height increasing,the foundation pit excavation will require a deeper thought to meet the requirements of the bearing capacity of building foundation excavation of deep foundation pit,but the potential will have a certain impact on the protection of adjacent buildings,the distribution of numerous and dense underground pipelines and the surrounding road excavation.Based on the deep excavation of Hefei new traffic building as an example,based on the monitoring data analysis and research,and the foundation pit excavation numerical simulation analysis using Midas/GTS software,combined with previous research results,effects of settlement and excavation of foundation pit soil settlement and horizontal displacement of underground continuous wall of the building,the main work and the results are as follows:1.Briefly introduces the research status of the influence on the surrounding environment excavation at home and abroad,and the characteristics of deep foundation pit support form and some deep foundation pit engineering accident type,and the deformation of the retaining structure of deep foundation pit excavation process and the deformation of soil around the related factors,elaborated the mechanism of deformation of deep foundation pit during excavation the soil and retaining structure,the previous researches show that the excavation of foundation pit only within a certain range around the surface subsidence influence,soil excavation is the pit pressure difference is generated,which is leading to pit soil displacement,horizontal displacement of diaphragm wall and building subsidence.2.Through the analysis and study of foundation pit monitoring data,draw the following conclusion: within a certain range,the pit distance closer,the surface settlement is greater;the underground continuous wall horizontal displacement curve was the middle two small bow shaped;3.The excavation of foundation pit soil only around a range of influence,starting from the edge of the pit within a certain range,from the edge of the pit is far greater in surface subsidence,the surface subsidence after reaching the maximum value,with the settlement from the foundation pit edge distance is enlarged on the surface to become smaller.4.According to the International Federation of trade unions,Santa B District 2,Fenghuang bridge 10 buildings settlement of strip foundation by contrast,Union City B district two dormitory building overall settlement,differential settlement and the maximum,and its weight is minimal,so building foundation form different buildings to have larger settlement effect5.Through analysis of horizontal displacement of the wall to even analog data,found that the maximum horizontal displacement shallow depth of diaphragm wall with increasing depth of the excavation increases,a maximum depth,with the open Foundation pit digging depth becomes large,buried deep underground continuous wall appears the maximum horizontal displacement is also larger,and ultimately regional stability,diaphragm wall at the bottom of the horizontal displacement is always smaller,eventually diaphragm wall horizontal displacement curve was big middle small ends the "bow" shape.6.The contrast analysis shows that by monitoring data and numerical simulation data of the Midas/GTS software foundation,the simulation result is more secure,consistent with simulation results and monitoring data,the software can be used for simulation of related engineering problems.