某实验站深埋施工地下水涌水来源分析

Hydrogeochemical characteristics and water inrush sources analysis of an experimental station

某实验站为大型深埋地下洞室,自开挖至花岗岩段涌水量不断增大,给工程施工及运行带来极大隐患,为此需查明地下洞室的涌水来源。通过选取典型水样进行水化学和同位素测试,发现深层花岗岩水和大气降水及浅层第四系水的水化学及氢氧同位素组成存在明显差异,表明主要涌水水源深层花岗岩水,不是直接来源于当地大气降水和浅层第四系水的就近入渗补给,而是大气降水通过区域径流间接补给深层花岗岩水。

An experimental station is a large deep-buried underground cavern.The amount of water inrush is increasing from excavating to granite section,which brings great hidden dangers to the construction and operation of the project.Therefore,it is urgent to find out the water inrush sources of the underground cavern.By selecting typical water samples and conducting water chemistry and isotope test,the author finds that there are obvious differences in the composition of water chemistry and hydrogen-oxygen isotopes between deep granite water and atmospheric precipitation and shallow quaternary water.It indicates that the main water source of deep granite water is not directly recharged by infiltration supplement of local atmospheric precipitation and shallow quaternary water.The deep granite water is indirectly supplied by atmospheric precipitation through regional runoff.