某高铁隧道小口径井抽水试验探讨

Discussion on Pumping Test of Small Diameter Well in a High Speed Railway Tunnel

指出了在某高铁隧道勘察中采用小口径抽水试验方法,具有操作简单便捷,成本低的优势。通过小口径井抽水试验查明场地的水文地质条件,得出了水文地质原始数据资料,根据单孔稳定流承压水非完整井的水文地质实际情况,选取合适的公式分别计算出了隧道岩层渗透系数及影响半径,为高铁隧道的勘察设计及顺利施工提供参考。

In the investigation of a high-speed railway tunnel,the small-diameter pumping test method has the advantages of simple operation and low cost.Through the pumping test of small-diameter well,the hydrogeological conditions of the site are found out,and the original hydrogeological data are obtained.According to the hydrogeological actual situation of the non-complete well with single hole unsteady flow confined water,the appropriate formula is selected to calculate the permeability coefficient of the rock stratum and the affected half diameter respectively,which provides reliable technical data support for the investigation,design and smooth construction of the highspeed railway tunnel.