Numerical simulation analysis of surface water seepage during operation of large underground water conveyance culvert

Abstract

The surface seepage problem has attracted attention during the operation period of Urban large underground water conveyance culvert. Taking the surface seepage of a large urban underground water conveyance culvert as the background, the numerical simulation analysis of surface seepage is carried out according to the engineering geological and hydrogeological conditions. Typical sections are selected to reflect the different leakage degrees of the culvert by setting different permeability coefficients of the lining, and then the influence on surface water seepage is analyzed. The result show that the more serious the leakage of the lining, the smaller the dissipation of the pore pressure of the lining, the more obvious the increase of the pore pressure of the soil at the top of the lining, and the increase of the surface pore pressure. When the permeability coefficient of the lining reaches 1 m/d, the surface water is exposed under long-term seepage. Compared with the field groundwater monitoring data, it is close to the simulation value. The research result have reference value for the design and operation of similar urban large underground water conveyance culvert.

Keywords

underground / water conveyance / pipe culvert / surface water seepage / numerical analysis