Evaluation on the rock burst risks of roadway using critical stress index method

被引：0
|
作者：
Wang A. [1 ,2 ]
Wang G. [1 ]
Dai L. [3 ]
Chen J. [4 ]
Shi T. [1 ]
Lü X. [5 ]
Cai R. [3 ]
机构：
[1] School of Mechanics and Engineering, Liaoning Technical University, Fuxin
[2] Research Institute of Rock Burst, Liaoning Technical University, Fuxin
[3] Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, Northeastern University, Shenyang
[4] Shenhua Xinjiang Energy Co., Ltd., Urumchi
[5] School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing
来源：
| 1626年 / China Coal Society卷 / 45期
关键词：
Critical stress index; Roadway; Rock burst; Rock burst hazard evaluation; Support;
D O I：
10.13225/j.cnki.jccs.DY20.0259
中图分类号：
学科分类号：
摘要：
Rock burst hazard evaluation refers to the confirmation of the rock burst hazard grades and dangerous areas,which is the foundation of rock burst prevention.The "stress-surrounding rock-support" model for roadway rock burst was established.Based on the rock burst theory of disturbance response instability,the internal relationships among the critical stress,the depth of critical resistance zone,the uniaxial compressive strength of coal mass,the support strength of roadway,the geometric parameters of roadway and the impact energy index were found.The impact energy index directly affects the size of the critical stress and critical resistance zone of the roadway surrounding rock system.The increase of the depth of the resistance zone leads to the increase of the critical load of the rock burst.The actual depth of the resistance zone and the stress environment are the important factors affecting the rock burst.The calculation method of the critical stress index considering the in-situ stress environment,the outburst proneness of the coal mass,the structural property of the roadway and the actual surrounding rock state was given.The critical stress index at the area where the rock burst occurred with similar conditions was taken as the rock burst occurrence index Kfcr of the area to be evaluated,and the critical stress index is divided into four nu-merical intervals with 0.25 Kfcr as the interval in[0,Kfcr],corresponding to the four risk grades of no hazard,weak hazard,medium hazard and strong hazard,respectively.The rock burst hazard of the area to be evaluated is determined according to the distribution of the critical stress index in the four intervals.Taking the 303 working face of a mine as an example,this paper introduces the process of rock burst hazard evaluation which includes 10 steps.The evaluation result shows that there are 5 areas with medium hazard and 7 areas with strong hazard in this working face.Compared with the comprehensive index method,the evaluation results of critical stress index method tend to be more quantitative,and the monitoring data of the drilling bits method show that the evaluation results are consistent with the results of field monitoring. © 2020, Editorial Office of Journal of China Coal Society. All right reserved.
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页码：1626 / 1634
页数：8
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共 19 条
  • [1] pp. 486-522, (2018)
  • [2] QI Qingxin, LI Yizhe, ZHAO Shankun, Et al., Seventy years development of coal mine rockburst in China:Establishment and consideration of theory and technology system, Coal Science and Technology, 47, 9, pp. 1-40, (2019)
  • [3] WEI Chunchen, ZHANG Chengguo, CANBULAT Ismet, Et al., Evaluation of current coal burst control techniques and development of a coal burst management framework[J], Tunnelling and Underground Space Technology, 81, pp. 129-143, (2018)
  • [4] (2008)
  • [5] DOU Linming, HE Xueqiu, Technique of classification forecasting rock burst in coal mines, Journal of China University of Mining & Technology, 36, 6, pp. 717-722, (2007)
  • [6] ZHANG Hongwei, RONG Hai, CHEN Jianqiang, Et al., Geo-dynamic condition evaluation method for rockburst in suberect and extremely thinck coal seam, Journal of China University of Mining & Technology, 44, 6, pp. 1053-1060, (2015)
  • [7] JIANG Fuxing, SHU Couxian, WANG Cunwen, Impact risk appraisal of stope working faces based on stress superimposition, Chinese Journal of Rock Mechanics and Engineering, 34, 12, pp. 2428-2435, (2015)
  • [8] JIANG Fuxing, FENG Yu, LIU Ye, Dynamic evaluation method for rockburst risk before stopping, Chinese Journal of Rock Mechanics and Engineering, 33, 10, pp. 2101-2106, (2014)
  • [9] CAO Anye, WANG Changbin, DOU Linming, Et al., Dynamic manifestation mechanism of mining on the island coalface along fault and dynamic pre-warning of seismic waves with seismic tomography, Journal of Mining & Safety Engineering, 34, 3, pp. 411-417, (2017)
  • [10] CAI Wu, DOU Linming, LI Zhenlei, Et al., Verification of passive seismic velocity tomography in rock burst hazard assessment, Chinese journal of Geophysics, 59, 1, pp. 252-262, (2016)
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