Analysis of the Effect of Waterproof Curtain on Foundation Pits

Using MIDAS/GTS to create three kinds of foundation pits model: no curtain, suspended curtain and floor curtain, to simulate, analyze and compare the excavation process of foundation pit under stress-seepage coupling. The research shows that the curtain can effectively control the water level drop outside the pit and the ground settlement caused by the precipitation, and it tends to be obvious with the increase of the curtain depth. After dewatering, the retaining pile shifted towards the foundation pit, and the displacement increased with the increase of curtain depth. The maximum value of the ground settlement after the excavation of the three kinds of foundation pits differs little, The ground settlement within the width of about half of the foundation pit is determined by the excavation and dewatering, while the rest is mainly determined by dewatering. With the increase of curtain depth, the maximum value of precipitation settlement outside the pit decreases from fast to slow, and the maximum value occurs closer to the foundation pit.