Detection of Stress Distribution in Surrounding Rock of Coal Seam Roadway Based on Charge Induction Principle

被引:0
|
作者
Wang, Gang [1 ,2 ]
Du, Lulu [1 ]
Fan, Dewei [1 ]
Wang, Aiwen [3 ]
Shi, Tianwei [3 ]
Dai, Lianpeng [3 ]
机构
[1] Liaoning Univ, Sch Environm Sci, Shenyang 110036, Peoples R China
[2] Liaoning Tech Univ, Liaoning Key Lab Min Environm & Disaster Mech, Fuxin 123000, Peoples R China
[3] Liaoning Univ, Inst Disaster Rock Mech, Shenyang 110036, Peoples R China
基金
中国国家自然科学基金;
关键词
charge induction; coal seam roadway; stress distribution; detection; STIMULATED CURRENTS; MARBLE SAMPLES; FAILURE; FRACTURE;
D O I
10.3390/electronics13153075
中图分类号
TP [自动化技术、计算机技术];
学科分类号
0812 ;
摘要
Rock burst is a worldwide prevention and control problem, and the main reason for its occurrence is the concentration of stress in the surrounding rock of the coal roadway. Therefore, it is of great significance to realize the rapid and accurate detection of the stress distribution in the surrounding rock of the roadway for the prevention and control of rock burst. Based on the principle of charge induction, this paper adopts a research method combining theoretical analysis and indoor and field tests to carry out a study on the charge induction detection of stress distribution of surrounding rock in coal seam roadways using the self-developed coal rock charge induction monitor. A theoretical analysis of the charge induction intensity in relation to the stress level is carried out. Indoor tests on the law of charge induction for graded loading of large sized coal samples are carried out. Field detection tests of the charge induction law at different drilling depths on the solid coal side and the large coal pillar side of the coal seam roadway are carried out. The results show a positive correlation between the charge signal intensity and the stress magnitude. The induced charge of coal samples has a tendency to increase with the increase in graded loading stress level. The magnitude of the induced charge can reflect the stress level of the coal body. On the solid coal side, the induced charge has a tendency of increasing and then decreasing with the increase in detection depth. The final results are in good agreement with the results of the drill chip method, which better reflects the distribution of the lateral support pressure of the roadway. On the side of the large coal pillar, the induced charge has a tendency to increase, then decrease, and then increase with the increase in probing depth, which is in good agreement with the distribution of lateral support pressure formed in the elastic core area of the large coal pillar. Therefore, the charge induction technology can be used as a fast, non-contact detection means for the partitioning and stress distribution of the roadway enclosure, which can provide guidance for the target prevention and controlling rock burst and for designing roadway support.
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页数:18
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