关键词: 地下水化学特征;氢氧同位素;硐温特征;来源识别;自一里水电站;

Abstract: The Ziyili Hydropower Station is located in a relatively developed area of fractured rock mass with rich groundwater.In order to reduce the potential water inrush disaster of underground projects in the hydropower station plant site, it is critical to identify the groundwater recharge source in the area.Through on-site investigation and sampling analysis, this paper studies the groundwater characteristics and the relationship between recharge and re-emission by means of hydrochemical analysis, hydrogen-oxygen isotope correlation analysis and isotope elevation effect methods, and identifies the conditions of groundwater re-emission in combination with the deep and temperature variation laws of the main adits.The research shows that the groundwater in the plant site of the Ziyili Hydropower Station mainly receives atmospheric precipitation recharge, and some adits also receives surface water recharge.Groundwater is affected by some evaporation in the process of infiltration.The water-rock effect of groundwater is obvious and is the main factor controlling ions in water.The elevation of groundwater recharge in adits is generally high, and there are certain differences in the way of recharge, and cross-recharge exists in some adits.According to mineralization and isotope characteristics, the runoff path and time of PD6 adit′s groundwater are short, the runoff speed is fast, and it is in the shallow weathering crack water cycle belt.

Key words: groundwater hydrochemical characteristics; hydrogen and oxygen isotope; temperature characteristics of adit; source identification; Ziyili Hydropower Station;