Study On The Control Of Ground Settlement Around Deep Foundation Pit By Precipitation And Recharge Measures

With the rapid growth of the social economy,the rapid expansion of the city,the public has a strong demand for the utilization of the land to promote the expansion of the urban buildings to the underground space,especially the convenient rail traffic makes the surrounding underground space get a lot of development and utilization.The research results have important practical guiding significance for the construction of deep foundation pit projects in urban centers.According to the engineering characteristics of the excavation of the foundation pit,the existing theoretical results are summed up to ensure that the excavation of the foundation pit can be carried out smoothly and that there is no influence on the surrounding environment in the process of excavation,that is,the surrounding settlement is controlled within the allowable range.And the control of settlement around foundation pit is studied.According to Darcy’s law,the Canadian water flow evaluation software Visual MODFLOW is used to calculate and reduce the pressure water and control the surrounding settlement,to guide the implementation of the project,and to optimize and verify the theoretical model through the project example.It provides a reference for the control of the similar project precipitation and the control of the surrounding settlement,and provides a design basis for further optimization of the influence of the depth of the precipitation well and the position of the recharge well on the ground settlement.Through the comparison between the numerical analysis and the actual measurement,it is found that the precipitation in the pit has an obvious effect on the excavation of the foundation pit,and the reasonable design of precipitation is of great significance to control the cost and progress of the project,and the effect of artificial recharge on the ground settlement control under the curtain of water stop curtain is positive.The larger the reflow volume,the smaller the ground settlement,but the deformation of the foundation pit will also slightly increase.By analyzing the setting of the precipitation parameters of different recharge wells and different depth of the precipitation well,and the tracking results of ground subsidence,the nearer the distance to the foundation pit is found,the more significant the control effect on the soil settlement around the foundation pit,but it is not conducive to the pressure reduction and water reduction of the confined water in the foundation pit.