Study on Subsidence Characteristics under Multi-well Dewatering and Recharging Conditions in Soft Clay
In order to study the soil deformation characteristics caused by precipitation and recharging of station foundation pits in soft clay,combined with the pumping test project of Shuixiangketing Station of the Shanghai City Railway Shifanqu Line,the water level changes and characteristics of the soil under pumping and recharging were analyzed.The study shows that:(1)During the pumping process,the generated in the upper and middle weakly permeable layers of the aquifer is significantly greater than that generated in the lower soil layer of the pumped aquifer.During the process of stopping pumping and reinjection,the rebound generated in the upper and weakly permeable layers of the pumped aquifer is significantly greater than that in the lower soil layer of the pumped aquifer.(2)During the pumping period,the closer the ground is to the pumping center,the greater the value will be.As it moves away from the pumping center,the ground tends to gradually decrease.The impact law of ground rebound caused by recharge and pumping is not the same.(3)The deformation between soil layers is closely related to the thickness of water containing layers and the properties of interlayer rock and soil.Soil layers with high rebound modulus and large layer thickness have higher rebound efficiency than those with low rebound modulus and small layer thickness.Nonlinear rebound exists in all water containing layers.
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