悬挂式止水帷幕室内模型试验研究

为了准确揭示设置悬挂式止水帷幕条件下基坑的控水规律，采用自行设计研制的模型试验箱开展了室内地下水渗流模型试验，研究帷幕插入深度对基坑内涌水量、降水影响半径、基坑外水位降深和地表沉降的影响.试验结果表明:以基坑内涌水量、基坑外水位降深和地面沉降为评价指标，帷幕插入深度在90~100cm之间，悬挂式止水帷幕的控水效果较好；以降水影响半径为评价指标，帷幕插入深度在80~90cm之间，悬挂式止水帷幕的控水效果较好；坑内与坑外水头损失占总水头损失的比值接近1∶1，帷幕底部小范围内的水头损失占比很小，受帷幕插入深度的影响也比较小.试验结果可为悬挂式止水帷幕的基坑降水设计提供参考依据.

Study on Indoor Model Test of Suspended Water Curtain

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.