Analysis of the influence of groundwater distribution characteristics on the impermeability of subway stations

Abstract

The urban groundwater environment has a great impact on the design and construction of subway stations, and it is also one of the important factors in the structural design of subway stations. To discuss the influence of groundwater distribution characteristics on the structure of subway stations, the numerical calculation and analysis method are used to study the distribution law of the seepage field of subway stations under different water pressure differences, which aims to elaborate on the influence effect of groundwater on the anti-seepage of subway station structure. The main conclusions are as follows. (1) As the groundwater level difference exceeds the station middle plate, and the water pressure is increasing with a first-order function, the influence of groundwater on the diaphragm wall is becoming more and more obvious. (2) When the pore pressure difference between the two sides of the station is large, the side with high groundwater level will be easier to bypass the bottom of the underground diaphragm wall and penetrate into the station floor. The more the pore pressure difference between the two sides of the station is, the more obvious this seepage phenomenon will be. (3) Although the underground water level monitoring has been included in the construction monitoring project of the metro station, the underground water level change caused by the artificial disturbance or extreme weather during the later operation period should also be paid attention to by the Metro builders.