The Research Of Suspended Waterproof Curtain To The Influence Of Deep Foundation Pit Dewatering

Xi'an Metro is the world's first subway in the loess region, hydrogeological situation is special. In the deep excavation process, because the groundwater is the important factors that impact deep foundation pit engineering construction, generally need to dramatically reduce deep foundation pit water level, However great head sent will allow groundwater trajectory great change, thus affecting the foundation pit supporting structure deformation, and has a negative impact on the surrounding area of deep Foundation. Setting sealing curtain can stop water for deep foundation pit construction and reduce adverse settlement. The dissertation of Xi'an, Tonghua door subway station as an example, Research on suspended waterproof curtain of foundation pit dewatering effects, seeking depth and head drawdown relationship of suspened waterproof curtain, doing further research to suspended waterproof curtain of deep excavation seepage. The research content as follows:The development process from seepage theory, based on the discuss basic equations and seepage stable seepage continuity equation with the solution conditions established, on the basis of the stable seepage finite difference calculation formula for the problem.Introduct groundwater seepage software VISUAL MODFLOW and MODFLOW module, and the foundation pit seepage finite difference method used in the software.Through to research on suspended waterproof curtain cases of foundation pit dewatering, Analysis the calculation method of precipitation excavation section under the influence of suspended waterproof curtain, And precipitation general conventional parameters in loess area, Meticulous know the water head changes outside of deep foundation pit curtain. Using the settlement calculation formulae,Considering the measured data and the field test, comparative analysis exist suspension waterproof curtain circumstances surrounding the surface theory sedimentation value and the actual sedimentation value,Preliminary fixed settlement calculation formula.Reference monitoring data of deep foundation pit deformation and settlement of surrounding structures, quantitative analysis of the influence factors of the building deformation of foundation pit (deformation, construction precipitation),summing the general data of loess area surrounding building deformation of deep foundation pit, using computer technology model simulated precipitation process, simulated rainfall process, contrast through three conditions quantify the effect of suspension waterproof curtain, Analyzing waterproof curtain's meaning and Quantitative the role, depict the characteristics of deep foundation pit seepage field, andreveal deep foundation seepage rule.