Application Research on Groundwater-level Rise and Diversion Measures in Subway Station Operation Period Based on Similar Physical Models

Abstract

Abstract Blocking seepage channels in underground engineering construction can easily cause changes in groundwater level and lead to a series of problems of deterioration of the geological environment. This paper uses the physical model test system and the preparation method of the corresponding stratum similar materials to carry out the physical model test of the application of the water fluctuation and diversion measures represented by the subway station. In this way, the excavation process of the subway structure is restored and the influencing factors of the water level fluctuation are studied. Firstly, according to the similarity theory, clay-similar, sand-similar and rock-similar materials were prepared using sand, clay, blanc fixe, iron powder and other raw materials. The simulation of six test conditions under four hydraulic gradient conditions was carried out, and then the solution of water-level fluctuation was proposed and tested. Finally, the influencing factors of water-level fluctuation are analyzed. The results of the study show that the largest water-level fluctuation occurs at the monitoring points on the upstream surface. The diversion measures adopted in this paper have obvious effect on the relief of water level yong height. The measured variation of water level in this experimental environment is 0.54m.