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| Experimental research on burst-prone coal mass of drilling method
under rich water condition |
| ZHU Guangan1，LIU Haiyang1，SHEN Wei2，LIU Huan1，JIANG Qipeng1，SU Boru1 |
| (1. College of Energy Science and Engineering，Xi?an University of Science and Technology，Xi?an，Shaanxi 710054，China；
2. Faculty of Architecture and Civil Engineering，Huaiyin Institute of Technology，Huai?an，Jiangsu 223003，China) |
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Abstract Under the influence of Luohe Formation aquifers in Shaanxi Binchang and Yonglong mining areas，the drilling index is difficult to clearly reflect the stress state of coal mass，which leads to the failure of drilling method and affects effective monitoring and pre-warning of rock burst. Taking natural and water-containing coal mass as the research object，the coal drilling test under different stress levels was carried out by using the self-developed triaxial loading and drilling platform to explore the mechanical response，borehole effect，evolution law of stress and energy，and damage failure mode of the water-containing coal mass. The results show that：(1) With the increase of the moisture content，the damage failure mode changes from“point-like”friction damage between microstructures to interlayer slip，dislocation and friction with weak structural planes. The number of cracks in the horizontal and vertical directions increase. (2) The frequency of dynamic response is positively correlated with the moisture content. Compared with natural coal body，the elastic energy storage capacity of water-bearing coal body decreases. For dynamic event，the incubation process is shortened，the frequency is increased but the magnitude of single energy release is reduced. (3) the damage of boreholes of natural coal structure is divided into three stages as movement concentration，crack initiation and crack penetration. With the increase of the moisture content，the sample only shows the characteristics of the first two stages. (4) The damage range of borehole deformation is positively correlated with the moisture content. When the moisture content is 1.4%，2.3%，and 3.7%，respectively，the damage radius along the borehole center is 2.03，2.98，and 3.36 times the drilling radius. The test results can provide reference for the correction of drilling index and disaster control under rich water condition.
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2022, Vol. 41 
