The Research Of Phreatic Water Inflow In Foundation Pit And Parametric Analysis Of Double Well Recharge

With the great development of the city, more and more city center area a ppear high-rise buildings, the attendant is the ultra deep foundation pit construc tion. The process of underground water engineering construction in some high underground water level cities(such as Shanghai, Tianjin etc.) is one of the di fficulties. Because of the influence of ultra deep foundation pit under confined water, in addition to considering the construction dewatering diving layer outsid e, but also according to the stability checking of basal anti bearing water. if th ere is not reasonable water inrush checking, especially in area with the higher level confined water. when the confined water pressure of pit bottom increasedto a certain extent, impermeable layer in pit will appear sand gushing, crackin g, large deformation and other forms of inrushing damage. this paper mainly ai ms at the above questions carry on some research:1.Mainly with the feature of soil and groundwater Tianjin area, through a typical engineering cases and numerical simulation software to summarize the gushing water in Tianjin area foundation pit precipitation about diving, confine d water step-down experience value, to provide some help for the design of fo undation pit engineering in Tianjin area precipitation inflow.2.Combined with foundation pit precipitation in yujiapu area in Tianjin, p recipitation will not only impact on the surrounding existing buildings, part of the region located adjacent to the Haihe River, a large area of the long-term p recipitation, especially the deep confined water buck could lead to seawater intr usion into the Hai He foundation pit retaining structure, caused by corrosion o n it, or even destroy the structure itself. So the main research because of the l arge area foundation pit precipitation caused by group of seawater intrusion, an d the use of recharge measures to control the invasion, and on various paramet ers of recharge well with analysis, find the best solution.3.Aiming at the application of double-well also less recharge parametric s tudy, were given back to Yang pumping position, given the flow analysis of re charge well recharge well position analysis of recharge comprehensive analysis of flow in two ways, and comparative analysis, to explore part of law of double-well recharge.