Study on Groundwater Control Method During Foundation Pit Construction of an Intercity Railway Station
To reasonably control the groundwater during the construction of foundation pit,taking an intercity railway station foundation pit project as the engineering background,first the pumping test is conducted to make predictive analysis of the water hydrology and water inrush of the foundation pit site,and then based on the results,the scheme of hanging wall and the pit drainage well is proposed to serve as water level observation well and inverted well,then the visual 3D groundwater flow simulation software Visual Modflow is used to make simulation analysis of foundation pit precipitation works,through comparative analysis,the wall bottom sealing scheme is adopted for precipitation control.The results show that:(1)the foundation pit site of the station is a marine and marine-terrestrial transitional facies sedimentary formation,with three layers of confined water where the absence of aquiclude in local position forms a leaking hole and water extraction from the third layer will cause water level drop in each layer and leaking recharge exists.(2)the water level observation well and inverted well are set around the foundation pit.Timely recharging according to the monitoring results can reduce the influence of the external water level of the foundation pit on the surrounding environment;(3)the depth of the groundwater has significant influence under different embedded depth.
foundation pit worksgroundwaterprecipitation controlinverted wellpressure relief well in pit and groundwater flow simulation
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