Optimization study and practice of metro tunnel dewatering well based on four strata
The underground water in the operation area of subway tunnel greatly increases the construction cost and safety risk.Therefore,based on the field pumping test of four strata,the paper draws the conclusion that the influence radius of different precipitation depths in the same strata is different;The permeability coefficient of each layer is 0.6m/d for strongly weathered granite(sand-like),0.02 m/d for moderately weathered granite,0.8 m/d for strongly weathered granite(fragment-like),and 0.04 m/d for breezy granite.Through calcula-tion and analysis,three schemes are designed to optimize the diameter,spacing and number of dewatering Wells.The conclusions are as fol-lows:1)The maximum water inflow is taken,the number of dewatering Wells is unchanged,and the diameter of dewatering Wells can be op-timized from 800 mm to 450 mm～600 mm;2)The water yield and diameter of the dewatering well remain unchanged,and the spacing of the dewatering well is optimized from 10 m to 15 m;3)Calculate the water amount according to the equivalent permeability coefficient,and the number of dewatering Wells can be 8 to 10.Finally,the optimized dewatering well scheme is adopted to successfully complete the con-struction task,and the practical results can provide reference for similar local projects.
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