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| Experimental study on the dip characteristics of key joints in rock mass based on
improved mechanical equivalence |
| JIN Aibing1，2，LU Tong1，2，WANG Benxin1，2，CHEN Shuaijun1，2，ZHANG Jinghui1，2，SU Nan1，2 |
| (1. Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mine，University of Science and Technology Beijing，Beijing 100083，China；2. School of Civil and Resources Engineering，University of Science and
Technology Beijing，Beijing 100083，China)
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Abstract In order to identify the key joints that have significant influence on the mechanical properties of rock mass from the complex random joint network，and to realize reasonable simplification of the joint network. The characteristics of the random joint network were studied by taking the dip angle as a variable. A random joint network was constructed based on Monte Carlo theory，and 7 kinds of joint specimens were prepared by 3D printing technology after eliminating a certain inclination angle. The uniaxial compression test was carried out. The variation coefficient method was used to improve the mechanical equivalent analysis method，and the dip angle characteristics of key joints were analyzed comprehensively based on the strength，deformation and energy characteristics of specimens. The results show that：(1) with increasing the joint removal angle，the peak stress and elastic modulus increase and then decrease，but the peak strain decreases and then increases. (2) The prepeak elastic energy density of the specimens increases with the joint removal angle，and the dissipation energy density shows a decrease-stabilize-increase trend. (3) The weights of 7 mechanical parameters are determined based on coefficient of variation method. It is considered that every dip angles has significant influence on specimens by comprehensive analysis of mechanical properties. The 90° and 45° dip angles have the most significant effect，while the 15° dip angle has minimal effect.
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2023, Vol. 42 
