Jinping A Power Plant Abutment Groove Site Groundwater Chemical Information Application

The first power station of Jinping Mountain lies in the west section of the Yanglongjiang River from Santan to shoupagou Gully,with a double-curved arch dam of 305-meter height and a normal water storage of 1880metres.The exposed strata of the damsite are marbles and arenaceous rocks of Triassic and solution fissures have been developed in the marbles of the Left-bank's dam abutment,and they have become a stratum of strong leakage .As a result,It has been an important problem for the dam foundation to stop leakage.This paper deals with the water-bearing media and water-bearing quality of the rocks in the damsite,at first ,then it concludes two water-bearing space structures,namely,T-shaped and Y-shaped structures,after the classification of the different rocks'water permeability.Furthermore.on the basis of the dynamic state of the ground-water and the hydrogeological conditions of this area,the groun-water system of the area has been prelimilarily divided accordingly.The hydrochemical materials of the ground-water reflect much information .The analysis of macroelements provide important references for the separation of the ground water system,and the important hydrochemical effects in the development of the ground water have been also concluded at the same time .The method of multivariate statistical analysis has been applied to macroelelements ,with cluster analysis and principal factor analysis especially,in orde to draw out impotant information ,which gets twice the result with half the effort.The analysises of microelements in the ground water have been provide important information,with the application of the rare earth elements especially: â‘  Ce abnormality preliminarily determines the relation oxidizing reducation environment of the groundwater in this region â‘¡Eu number reflects the characteristics of different ground water systems .â‘¢The ratio of MREE Sm to Tb shows the degree of acid and karst process, oxidation and reduction in the course of water rocks to each other.The information of the carbon and oxygen isotopes in the ground-water's in carbonate plays an indicated role in the seperation the ground water system.And in the end of the paper,some prelimilary suggestion have been naturally put forward for the stop of the leakage in the dam foundation.