关键词: 水库大坝, 坝基勘测, 综合物探, 高密度电法, 地震映像法, 瑞雷波法

Abstract: In order to meet the basic requirements of concrete gravity dam for foundation rock(it needs to be built on hard bedrock), it is necessary to find out the thickness and change of overburden above the top surface of foundation rock in the dam site area, and explore whether there are geological defects in the foundation rock. This paper introduces the application of geophysical prospecting techniques such as high-density resistivity method, seismic imaging method and Rayleigh wave method in the survey of dam foundation of a certain reservoir in Shanxi. The variation law of the thickness of the Quaternary overburden is basically found out, the weathering grooves in the rock of the dam foundation are revealed, and detailed technical data are obtained, which provides a reliable scientific basis for the design of the reservoir project. The example proves that rational use of technical advantages of various geophysical methods can achieve the effect of complement each other and mutual verification, so as to improve the reliability and accuracy of geophysical test results and escort engineering construction and safety.

Key words: reservoir dam, dam foundation survey, integrated geophysical prospecting, high density resistivity method, seismic imaging method, Rayleigh wave method