Leakage Analysis And Treatment Of Foundation For Gravity Dam And Reservoir In Bad Geological Condition Area

The leakage in scale of reservoir and dam is that water leak through cracks,fracture zone,holes or karst channel in rock or soil of slope of reservior,foundation of dam and abutment of dam out of reservoir,where pressure is different between upstream and downstream after impoundment.The leakage is bad for stability of dam foundation and abutment,the reservoir and slope.In water resources and hydropower project,the leakage controlling which relates to the project safety,surrounding natural environment and social environment is one of the important factors leading to a successful project.So the leakage should be paid enough attention.For the exsiting of leakage,which should be taken the appropriate measures to control and reinforcement basing on the analysis of the matter.In this article,according to specific leakage problems in a real project construction,using the current popular in the model simulation analysis method,simulant analy the proposed subarea-subsection curtain grouting anti-seepage treatment measures,then draws a result of the expected control in different stages of the seepage treatment process.curtain grouting design can be guided by above metioned result.with the result of which played an important role to control quantity,to shorten the construction period and to reduce the project cost.The gravity dam was constructed on cracked rock.The geological condition is very bad.After the project was completed,maximum leakage of dam foundation is 178l/s in site monitor.Major accidents maybe happen without any treatment In this paper,the causes of the leakage will be analyzed basing on a large number of monitoring data by the theoretical analysis of numerical simulation tools.The leakage preventing work will be planned on this basis.The outline in the paper includes three aspects:(1)Geological survey and site monitor There is bad rock in dam foundation area.The leakage from cranny is primary matte.And there is not large centralized leakage.(2)Theoretical analysis of leakage matter limestone that can contain water and fault shear zone in dam site area,all of which makes the rock crushing and structure surface development.(3)Treatment measure Give priority to with plug measure,at same time combining with drainage.Leading seepage discharge by adding drain water holes;Adding extending grouting treatment of the dam foundation to improve the integrity of the rock.The final results show that treatment measures of lekage meet the safety requirements of long-term operation of the project.