Study On The Control And Prediction Of Deformation In Deep Pit Causing By Construction

Along with the development of economy and the steady progress of urbanization process in our country, there are more and more deep foundation pit being used in the city construction.At the same time, there are lots of problems be exposed, and foundation pit accident occur frequently.Therefore,studying of the settlement of ground surrounding the foundation pit which caused by the construction of the foundation pit,and getting a kind of method which can predict accurately the deformation will have important engineering significance.Deep foundation pit construction process is a continuous process, In this process, because of the digging and dewatering,the stress field of foundation soil and the seepage field are changed.As a results,it cause the pit deformation and the surrounding the ground settlement. Whether these changes will be the foundation and the surrounding the building security bring adverse impact,my paper will study with them according to tianjin tai'an raod of deep foundation pit engineering.By using the FLAC 3D finite difference software,simulating the process of foundation pit construction,then the calculated results were compared with the field measured data,the model parameters,which is the compressive modulus of the foundation soil,is deduced.We can use this model parameters to focast the next deformation of the pit.Through calculation, this paper concluded the different soil layer's model parameters value range in FLAC 3D.At the same time,it is feasible using FLAC 3D to forcast the formation of the pit.Besides, comparing with calculated value and monitoring value of the buildings'deformation around the pit, once again proven that it's feasible using FLAC 3D to forcast the formation of the pit.Deep foundation pit dewatering construction,there are lots of underground water be extracted.In this paper,Visual Modflow is used to simulate the process of deep foundation pit dewatering,and evaluate the influence of dewatering about the ground settlement and water environment.