Analysis of seepage characteristics and causes of dam foundation of the right dam of a reservoir

• 1、School of Civil Engineering and Mechanics,Lanzhou University,Lanzhou,Gansu 730000
• 2、Key Laboratory of Mechanics on Disaster and Environment in Western China of Ministry of Education, Lanzhou University, Lanzhou, Gansu 730000

Abstract：In recent years, small and medium-sized reservoirs in the soil dam prone to dam foundation, abutment and dam leakage. In this paper, the leakage of the right dam section of a reservoir is studied and the concrete reasons for the impossibility of this reservoir are analyzed. Through the analysis of the data obtained from the water level monitoring hole, borehole core, water pressure test, wave velocity logging and borehole panoramic imaging of the dam site, the main reason why the reservoir can not be successfully stored is the dam foundation Grouting curtain effect did not achieve the desired effect (water permeability less than 3Lu), bedrock roof permeability is still large, as the main leakage sites and channels, the main leakage range for the grouting cover below 10m, the F3 fault and three open Great unloading fissures are not carried out to a deeper level of proof and seepage treatment, leaving it as a potential leakage channel. In addition, the underground occurrence and freezing and thawing of the fissure water of the right bank of the right bank have a certain effect on the formation of the leakage channel, and the corresponding risk and disaster assessment should be made.

Keywords： a reservoir dam foundation leakage permeability permeability channel