Study of the Groundwater Table Controlling for Deep Foundation Pits

The changing tendency of water inflow and the volume of cone of depression along with the groundwater table of the deep foundation pit with non-complete steady flow well in isotropic water-bearing stratum is analyzed.In order to simplify the analysis,the concepts of water inflow ratio and volume ratio are introduced.And the regression analysis method is used in fitting test results.A scientific expression method of water inflow and the volume of cone of depression along with the groundwater table of the deep foundation pit is given while required accuracy is satisfied.Then,since the difference of groundwater recharge and discharge is equal to the hole difference of cone of depression,water table control formula is given.Finally,we combined the project and analyse the observation results of foundation pit drainage carefully.The computation parameter was chosen reasonably and was used to forecast and the control to the ascending velocity of water table.It has proved the accuracy of the analytical method and computing technology.