基坑工程地下水渗流模型试验系统研究

设计了符合基坑工程条件的模型试验系统,可以模拟基坑地下水渗流。模型试验系统由土箱、排水箱、进水箱、上水箱、下水箱、测压装置等组成。通过给定进水箱与排水箱的水位可以实现基坑内外水头恒定,从而形成稳定的渗流。利用模型试验系统已经完成的试验为悬挂式截水帷幕基坑地下水渗流以及完整井条件下的层状含水层渗流,获得与实际工程相符的渗流流网形态,用来研究地下水渗流场的特征和规律。试验结果可指导实际工程设计,同时可用来修正基坑规程中地下水涌水量、坑外水位降深以及降水引起的沉降计算等。

Model test system for groundwater seepage in foundation pit engineering

The model test system designed is in accordance with the conditions of foundation pit engineering, which can simulate the groundwater seepage. It is composed of a soil box, a drainage box, a feed-water tank, an upper water tank, a lower water tank and a pressure measuring device. It can get the constant water head inside and outside the foundation pit by changing the water level in the feed-water tank and the drainage box, and thus forming stable seepage. The model test system is used to complete the tests on groundwater seepage of foundation pit with unclosed curtain of cutting-off drains and the groundwater seepage of completely penetrating well in stratified aquifers. The seepage shape gained is consistent with the actual situation, and it is used to study the characteristics and laws of groundwater seepage fields. The test results can guide the actual engineering design, and can be used to modify the calculation of water inflow, the water level drawdown outside the foundation pit and the settlement caused by precipitation in foundation pit specifications.