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| Experiment on progressive failure law of tar-rich coal under microwave-water interaction |
| SHAN Pengfei1，2，3，YANG Pan1，LAI Xingping1，2，3，SUN Haoqiang1，GUO Zhong?an4，GU Helong1，2，3，LI Wei1，ZHANG Shuai1 |
| (1. College of Energy Science and Engineering，Xi?an University of Science and Technology，Xi?an，Shaanxi 710054，China；2. State Key Laboratory of Coal Resources in Western China，Xi?an University of Science and Technology，Xi?an，Shaanxi 710054，China；3. Key Laboratory of Western Mine Exploration and Hazard Prevention，Ministry of Education，Xi?an University of Science and Technology，Xi?an，Shaanxi 710054，China；4. Shaanxi Zhongtai Energy Investment Co.，Ltd.，Yulin，Shaanxi 719109，China) |
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Abstract The tar-rich coal reserves in northern Shaanxi are large，and its components contain more shale gas. At the same time，its internal fissures are few，dense and strong，and the underground mining process presents“three big and one fast”，which is easy to form large-scale roof hanging and other secondary disasters. There are many shortcomings in conventional measures to control roof dynamic disasters. Therefore，microwave radiation is introduced to make tar-rich coal samples with different moisture contents. Through microwave irradiation of tar-rich coal samples with different moisture contents，analyze the changes of physical and mechanical properties of coal samples under microwave irradiation，and the crack propagation law，the final failure form of coal samples and the fractal dimension based on the equivalent side length-mass of coal samples under microwave irradiation are studied. The experimental results show that：(1) Under the same microwave radiation condition，the energy accumulation and dissipation of coal samples are negatively correlated with the water content，and the average longitudinal wave velocity of tar-rich coal decreases by 4.22%，7.23% and 11.76% respectively，and the energy accumulation and dissipation are further reduced. (2) With the increase of water content，the failure mode of tar-rich coal gradually changed from compression-shear failure to tension-shear mixed failure. With the introduction of microwave radiation，the failure degree of tar-rich coal continued to increase，and the failure mode gradually changed from shear failure to columnar tensile failure. Compared with water，microwave has a stronger effect on coal sample reforming，and the participation of water makes the effect of microwave obviously improved. (3) With the increase of water content，the fractal dimension shows a decreasing trend，and the decreasing rate of fractal dimension is more obvious after microwave is introduced. Therefore，both of them can promote the decrease of fractal dimension. The progressive failure law of tar-rich coal under the interaction of microwave and water is revealed，which provides an effective reference for the mechanism of microwave and hydraulic fracturing，and provides basic theoretical support for roof dynamic disaster prevention measures.
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2023, Vol. 42 
