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| Experiment study on drilling pressure relief for rockburst prevention and its failure characteristics
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| LIU Dongqiao1，LIU Hehe1，2，WANG Yang1，3，SUN Jie1，2，HE Manchao1，2， PENG Dong1，2，LAN Yifeng1，2 |
| (1. State Key Laboratory for Geomechanics and Deep Underground Engineering，China University of Mining and Technology (Beijing)，Beijing 100083，China；2. School of Mechanics and Civil Engineering，China University of
Mining and Technology(Beijing)，Beijing 100083，China；3. Institute of Geomechanics，
Chinese Academy of Geological Sciences，Beijing 100081，China) |
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Abstract Strainburst is a rockburst phenomenon induced by the redistribution of surrounding rock stress in the process of roadway excavation，which poses a major threat to the safety of personnel and equipment in mining and tunnel construction. In this paper，the self-developed strainburst experiment system is used to carry out strainburst experiments of intact sandstone samples and samples with different numbers of boreholes. High-speed photography is used to collect images of the whole process of rockburst，and monitoring methods such as acoustic emission and digital speckle are used to collect relevant data. Based on the data，the failure characteristics of the sandstone strainburst under the conditions of different drilling numbers are studied，and the influence of the number of drilling holes on the strainburst is discussed under. The results show that with increasing the number of boreholes，the intensity of rockburst decreases，the accumulative count and accumulative energy value of acoustic emission decrease，and the activity degree of acoustic emission decreases，indicating that the micro-fracture in the rock body decreases. When the kinetic energy decreases，the rockburst risk level decreases from a strong rockburst，and the fragmentation degree of the ejected debris decreases. When the rockburst occurs，the vertical and horizontal maximum displacements of the rock sample increase，and the deformation capacity increases. The experiments show that the measures of borehole pressure relief have a good prevention and control effect on rockburst disasters.
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2023, Vol. 42 
