Analysis And Evaluation Of Survey And Pumping Test Results Of Metro Line 3

Most of the subway projects are underground.Underground stations and section tunnels are greatly affected by groundwater.If the groundwater is not properly handled,it is likely to cause water problems during the subway excavation process and affect the surrounding environment,which will lead to major engineering safetily accident.Therefore,it is a key factor to study the permeability coefficient and influence radius of submerged aquifer.At present,most of the production practice is based on the steady flow pumping test formula to determine the permeability coefficient and radius of the submerged aquifer.However,such pumping tests generally require more exploration and test work than under any circumstances.After the analysis on the impact of underground engineering,taking the line of?Haerbin subway as an example,the water discharge of underground engineering.Starting from aspects of subway engineering construction safety,quality and cost,the paper analyzes the impact of groundwater upon subway engineering.It is suggested that the engineering precipitation requirements should be taken as a reference,and the pumping test of the engineering well should be done before the foundation pit support design and construction,so as to calculate the water level falling speed and water inflow per unit time and so on,so as to provide the basis for the optimization of the precipitation scheme.And in the implementation of project precipitation,land subsidence should be monitored and evaluated at the same time.