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| Study on calculation method of anisotropic acoustic and mechanical parameters of layered rock |
| DENG Huafeng1，LI Tao1，LI Jianlin1，XIONG Yu1，QI Yu1，WAN Liangpeng2 |
| (1. Key Laboratory of Geological Hazards on Three Gorges Reservoir Area，Ministry of Education，China Three Gorges University， Yichang，Hubei 443002，China；2. Wudongde Engineering Construction Department of China Three Gorges Construction Management Co.，Ltd.，Chengdu，Sichuan 610000，China) |
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Abstract The distribution of the bedding weak plane directly affects the acoustic and mechanical characteristics of bedding rock mass, and also directly affects the rationality of the value of the rock mass mechanical parameters. Sandstone samples with 7 bedding dip angles，such as 0°，15°，30°，45°，60°，75° and 90°，were prepared for longitudinal wave velocity test and uniaxial compression test. The results show that：(1) With the increase of bedding dip angle，the longitudinal wave velocity and elastic modulus of bedding sandstone gradually increase，and the peak compressive strength shows a U-shaped trend of first decreasing and then increasing，and the anisotropic characteristics are obvious. The elliptic curves of longitudinal wave velocity，elastic modulus and cosine value of bedding dip angle of bedding sandstone are established respectively. Only by testing the longitudinal wave velocity and elastic modulus of bedding rock mass in two directions of parallel bedding and vertical bedding，the longitudinal wave velocity and elastic modulus of rock samples with arbitrary dip angle can be determined，which provides a practical and convenient method for determining the acoustic parameters and elastic parameters of bedding rock mass in different directions；(2) The main direction of stress of the bedding rock mass determines its bearing capacity and deformation and failure characteristics. When determining the relevant basic parameters of engineering rock mass quality evaluation，we should pay attention to the influence of bedding angle, and the testing direction should be consistent with the main stress direction，or the acoustic parameters and mechanical parameters of parallel bedding and vertical bedding should be tested respectively，and then converted to the corresponding bedding dip angle according to the established empirical formula for analysis，so as to obtain more accurate rock mass quality evaluation indexes. Relevant research results can provide a good reference for testing and analyzing anisotropic acoustic and mechanical properties of bedding rock mass.
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2020, Vol. 39 
