深基坑降水的水位控制

目的优化深基坑降水设计,节约工程投资,加快施工进度.方法分析了含水层稳定流潜水非完整井基坑涌水量随地下水位的变化趋势,利用回归分析方法对降水试验结果进行拟合.结果根据基坑涌水量及水位下降后形成的无水区体积与地下水位之间关系,引入涌水量比例系数和体积比例系数的概念,给出了控制基坑地下水位的公式.结论部分降水井停止降水后,利用建筑物的自重与地下水的浮力相平衡,提出了水位上升速度预测和控制方法,节省了工程投资.

Study of the Groundwater Table Controlling for Deep Foundation Pits

The changing tendency of water inflow and the volume of cone of depression along with the groundwater table of the deep foundation pit with non-complete steady flow well in isotropic water-bearing stratum is analyzed.In order to simplify the analysis,the concepts of water inflow ratio and volume ratio are introduced.And the regression analysis method is used in fitting test results.A scientific expression method of water inflow and the volume of cone of depression along with the groundwater table of the deep foundation pit is given while required accuracy is satisfied.Then,since the difference of groundwater recharge and discharge is equal to the hole difference of cone of depression,water table control formula is given.Finally,we combined the project and analyse the observation results of foundation pit drainage carefully.The computation parameter was chosen reasonably and was used to forecast and the control to the ascending velocity of water table.It has proved the accuracy of the analytical method and computing technology.