EXPERIMENTAL RESEARCH ON INFLUENCE OF SATURATION DEGREE ON SANDSTONE LONGITUDINAL WAVE
VELOCITY AND STRENGTH
DENG Huafeng1,2,YUAN Xianfan1,2,LI Jianlin1,2,HE Ming1,2,LUO Qian1,2,ZHU Min1,2
(1. Collaborative Innovation Center for Geo-hazards and Eco-environment in Three Gorges Area,China Three Gorges University,Yichang,Hubei 443002,China;2. Key Laboratory of Geological Hazards on Three Gorges Reservoir Area of Ministry
of Education,China Three Gorges University,Yichang,Hubei 443002,China)
Abstract:In the correlation research of rock saturation degree,longitudinal wave velocity and strength,the influences of saturation process and air-drying process on strength and longitudinal wave velocity are lack of comprehensive consideration;however,the study of these problems is of great significance for ultrasonic technology in the testing of rock physico-mechanical parameters. Based on these,typical layered sandstones in the Three Gorges reservoir area were selected,vertical-bedding samples and parallel-bedding samples were prepared to conduct saturation and air-drying experiment. The experimental results show that:(1) The relationship between longitudinal wave velocity and saturation degree is obviously nonlinear and nonmonotonic;the longitudinal wave velocity of water-bearing rock is not only related to saturation degree,but also associated with saturation process and air-drying process. (2) The anisotropy of sandstone is obvious;the longitudinal wave velocity change range of vertical-bedding rock is significantly greater than that of the parallel-bedding rock in the process of saturation and air-drying;and the anisotropic characteristics of the sandstone increase slightly under saturated state. (3) In the process of saturation and air-drying,the changing laws of compressive strength and longitudinal wave velocity are inconsistent. The adsorbed water which is on the surface of mineral particles and pore wall has a great influence on elastic modulus and strength;however,the influence of pore saturation degree on longitudinal wave velocity is more apparent. These research results have important reference value for the strength and longitudinal wave velocity tests of water-bearing rock;what?s more,the relevant test methods can provide reference for similar test.
ARIOGLU E,TOKGOZ N. Estimation of rock strength rapidly and reliably by the Schmidt hammer[J]. Journal of Mines,Metals and Fuels,1991,39(9):327-331.
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