Calculation of groundwater head distribution with a close barrier during excavation dewatering in confined aquifer
Calculation of groundwater head distribution with a close barrier during excavation dewatering in confined aquifer
复制标题
承压含水层开挖排水过程中封闭屏障地下水头分布计算
DOI：
10.1016/j.gsf.2020.08.002
复制
发表时间：
2021-03-01
影响因子：
8.9
通讯作者：
Zhou, An-Nan
中科院分区：
文献类型：
--
作者：
Lyu, Hai-Min;Shen, Shui-Long;Zhou, An-Nan
在基坑内承压含水层（防水帷幕）抽水时，由于帷幕屏障的存在，基坑外地下水渗流方向由水平向垂直方向转变。对于基坑内降水引起的地下水头分布，目前尚无解析计算方法。本文首先分析了承压含水层封闭拦阻作用的机理。然后，提出了一个基于解析解的简单方程，用于计算承压含水层中有防水帷幕（以下简称封闭屏障）开挖坑内外的地下水水头。地下水水头分布是根据两个条件推导出来的：(1)恒定水头抽水和(2)恒定流量抽水。数值模拟和实验结果验证了所提计算公式的正确性。结果表明，该模型可应用于基坑工程实际。
When pumping is conducted in confined aquifer inside excavation pit (waterproof curtain), the direction of the groundwater seepage outside the excavation changes from horizontal to vertical owing to the existence of the curtain barrier. There is no analytical calculation method for the groundwater head distribution induced by dewatering inside excavation. This paper first analyses the mechanism of the blocking effects from a close barrier in confined aquifer. Then, a simple equation based on analytical solution is proposed to calculate groundwater heads inside and outside of the excavation pit with waterproof curtain (hereafter refer to close barrier) in a confined aquifer. The distribution of groundwater head is derived according to two conditions: (i) pumping with a constant water head, and (ii) pumping with a constant flow rate. The proposed calculation equation is verified by both numerical simulation and experimental results. The comparisons demonstrate that the proposed model can be applied in engineering practice of excavation.