Abstract: In order to accurately reveal the water control law of the foundation pit under the condition of suspended water-stopping curtain， the indoor groundwater seepage model test was carried out to study the influence of the curtain insertion depth on the water inflow in the foundation pit， the influence radius of precipitation， the water level drop outside the foundation pit and the ground settlement. The test results show that taking the water inflow in the foundation pit， the water level drop outside the foundation pit and the ground settlement as evaluation indexes， the curtain insertion depth is between 90~100cm， and the hanging water-stop curtain has a good water control effect; taking the influence radius of precipitation as the evaluation index， the curtain insertion depth is between 80~90cm， and the hanging water-stopping curtain has a good water control effect; the ratio of water head loss in the pit and outside the pit to total water head loss is close to 1∶1. The water head loss in the small range at the bottom of the curtain accounts for a very small proportion and is also less affected by the depth of curtain insertion. The test results can provide reference for foundation pit dewatering design of suspended water curtain.

Key words: suspended water-stopping curtain, water inflow, water level drawdown, radius of influence, land subsidence