Correlation between Wave Velocity and Deformation Modulus of Basalt Masses as Dam Foundation in Hydropower Projects
Zhou Hongfu
Nie Dexin
Wang Chunshan
Abstract：Deformation modulus is an important parameter for rock engineering design.However,the relation between longitu-dinal wave velocity and deformation modulus is often used to estimate the deformation modulus of large-scale and deep rock mass in the hydroelectric projects because it is difficult to conduct many in-situ and laboratory deformation modulus tests due to the limited funds,time and test size during the engineering survey and the test results have no general representativeness.In this paper,the intrinsic relation between longitudinal wave velocity and rock deformation modulus is theoretically explained based on the wave differential equation.Meanwhile,132 in-situ test data derived from 4 hydropowers are used to set up an experience formula between longitudinal wave velocity and deformation modulus for basalt in the Jinsha River area.The results show that there is close relation between the basalt longitudinal wave velocity and its deformation modulus.The deformation modulus difference of different basalt rock masses by calculating of longitudinal wave velocity is small whenV p <4 500 m/s. While it becomes larger whenV p >4 500 m/s.The optimal equation is helpful to evaluate the deformation modulus of basalt rock mass,and it offers a quick and scientific method for selecting basic parameters of dam foundation in the hydropower projects.
Keywords：basalthydropower projectdeformation moduluslongitudinal wave velocityrock mass of dam foundationcorre-lationgeotechnical engineering
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 1904-1912 )