Model test study on propagation law of plane stress wave in jointed rock mass under different in-situ stresses

1st International Global on Renewable Energy and Development

Dong, Qian^1,2

School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, Hubei, China^1

Hubei Key Laboratory of Road-bridge and Structure Engineering, Wuhan University of Technology, Wuhan, Hubei, China^2

关键词: Confining pressures;    Insitu stress;    Intact rocks;    Jointed rock mass;    Loading condition;    Plane stress;    Transmission coefficients;    Underground rock mass;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/100/1/012009/pdf
DOI  :  10.1088/1755-1315/100/1/012009

来源: IOP

【 摘 要 】

The study of propagation law of plane stress wave in jointed rock mass under in-situ stress has important significance for safety excavation of underground rock mass engineering. A model test of the blasting stress waves propagating in the intact rock and jointed rock mass under different in-situ stresses was carried out, and the influencing factors on the propagation law, such as the scale of static loads and the number of joints were studied respectively. The results show that the transmission coefficient of intact rock is larger than that of jointed rock mass under the same loading condition. With the increase of confining pressure, the transmission coefficients of intact rock and jointed rock mass both show an trend of increasing first and then decreasing, and the variation of transmission coefficients in intact rock is smaller than that of jointed rock mass. Transmission coefficient of jointed rock mass decreases with the increase of the number of joints under the same loading condition, when the confining pressure is relatively small, the reduction of transmission coefficients decreases with the increasing of the number of joints, and the variation law of the reduction of transmission coefficients is contrary when the confining pressure is large.