富水厚砂层斜井施工阶梯降水方法研究

Study on Method of Dewater by Step for Inclined Shaft Construction about Water-rich Thick Sandy Stratum

为了有效解决富水厚砂层斜井施工过程中地下水问题,基于潜水完整井降水理论,参考深基坑"大井法"降水方法,提出了潜水完整井大井法斜井阶梯降水基本理论,得到了降水单元流量与布置间距的关系。用此理论指导薛庙滩矿井二号缓坡副斜井降水施工,结果表明:降水后地下水位沿斜井方向逐渐降低,均在斜井底板安全距离以下;使斜井井筒能够用传统方法掘进,降低工程造价与施工难度。

In order to effectively solve the problem of groundwater during inclined shaft construction with water-rich thick sandy stratum, based on precipitation theory of complete phreatic well, referenced deep foundation big well method precipitation, proposed basic theory of dewater by step for inclined shaft construction, obtained the relationship between dewater unit flow rate and arrangement spacing. Using this theory to guide dewatering construction of Xuemiaotan mine vice inclined shaft, the results showed that after the precipitation, the groundwater level is gradually reduced along inclined shaft, which are below the safe distance of inclined shaft, so that the inclined shaft can be excavated by traditional way, reduce the engineering cost and construction difficulty.