Risk evaluation of rock burst through theory of static and dynamic stresses superposition

Abstract

Rock burst is one of the most catastrophic dynamic hazards in coal mining. A static and dynamic stresses superposition-based (SDSS-based) risk evaluation method of rock burst was proposed to pre-evaluate rock burst risk. Theoretical basis of this method is the stress criterion incurring rock burst and rock burst risk is evaluated according to the closeness degree of the total stress (due to the superposition of static stress in the coal and dynamic stress induced by tremors) with the critical stress. In addition, risk evaluation criterion of rock burst was established by defining the “Satisfaction Degree” of static stress. Furthermore, the method was used to pre-evaluate rock burst risk degree and prejudge endangered area of an insular longwall face in Nanshan Coal Mine in China. Results show that rock burst risk is moderate at advance extent of 97 m, strong at advance extent of 97–131 m, and extremely strong (i.e. inevitable to occur) when advance extent exceeds 131 m (mining is prohibited in this case). The section of two gateways whose floor abuts 15-3 coal seam is a susceptible area prone to rock burst. Evaluation results were further compared with rock bursts and tremors detected by microseismic monitoring. Comparison results indicate that evaluation results are consistent with microseismic monitoring, which proves the method’s feasibility.

Keywords

rock burst / hazard / mining / stress / risk evaluation / microseismic monitoring

References

[1] DouL-m, ZhaoC-g, YangS-g, WuX-rongPrevention and control of rock burst in coal mine [M], 2006, 4/5: 32-33

[2] DouL-m, HeX-qiuTheory and technology of rock burst prevention [M], 2001, Xuzhou, China University of Mining and Technology Press: 6-11

[3] MuZ-l, DouL-m, HeH, FanJun. F-structure model of overlying strata for dynamic disaster prevention in coal mine [J]. Int J Min Sci Tech, 2013, 23(4): 513-519

[4] DehghanS, ShahriarK, MaarefvandP, GoshtasbiK. 3-D modeling of rock burst in pillar No. 19 of Fetr6 chromite mine [J]. Int J Min Sci Tech, 2013, 23(2): 231-236

[5] LiuX-h, WuA-x, WangC-l, WangH-j, WangY-ming. Study on rock burst forecasting prediction in a deep mine [J]. J Min Safety Eng, 2012, 29(1): 78-83

[6] HeJ, DouL-m, LuC-ping. Characteristic and prevention research on rock burst of thin coal seam [J]. J China Coal Society, 2012, 37(7): 1094-1098

[7] LiZ-l, DouL-m, CaiW, HeJ, WangG-f, LiuJ, HanR-jun. Fault-pillar induced rock burst mechanism of thick coal seam in deep mining [J]. Chin J Rock MechEng, 2013, 32(2): 333-342

[8] ZhaoS-k, OuyangZ-h, LiuJ, ZhangG-h, WangY-r, LiX-lu. Theory and application of prevention of rock burst by advanced deep hole roof blasting [J]. Chin J Rock Mech Eng, 2013, 32(S2): 3768-3775

[9] AdokoA C, GokceogluC, WuL, ZuoQ-jun. Knowledge-based and data-driven fuzzy modeling for rockburst prediction [J]. Int J Rock Mech Min Sci, 2013, 61: 86-95

[10] HeH, DouL-m, FanJ, DuT-t, SunX-lin. Deep-hole directional fracturing of thick hard roof for rockburst prevention [J]. Tunn Undergr Sp Tech, 2012, 32: 34-43

[11] KonicekP, SoucekK, StasL, SinghR. Long-hole destress blasting for rockburst control during deep underground coal mining [J]. Int J Rock Mech Min Sci, 2013, 61: 141-153

[12] KornowskiJ, KurzejaJ. Prediction of rockburst probability given seismic energy and factors defined by the expert method of hazard evaluation (MRG) [J]. Acta Geophy-sica, 2012, 60(2): 472-486

[13] WangH-w, JiangY-d, ZhuJ, ShanR-y, WangChen. Numerical investigation on the assessment and mitigation of coal bump in an island longwall panel [J]. Int J Min Sci Tech, 2013, 23(5): 625-630

[14] KurzejaJ, KornowskiJ. The basic assumptions of the quantitative version of the comprehensive method of rockburst hazard evaluation [J]. Gospodarka Surowcami Mineralnymi-Mineral Resources Management, 2013, 29(2): 193-204

[15] PatynskaR. The consequences of rock burst hazard for Silesian companies in Poliand [J]. Acta Geodynamica Et Geomaterialia, 2013, 10(2): 227-235

[16] PatyñskaR, KabieszJ. Scale of seismic and rock burst hazard in the Silesian companies in Poland [J]. Min Sci Tech (China), 2009, 19(5): 604-608

[17] DouL-m, ChenT-j, GongS-y, HeH, ZhangS-bin. Rock burst hazard determination by using computed tomography technology in deep workface [J]. Safety Sci, 2012, 50(4): 736-740

[18] Díaz AguadoM B, GonzálezC. Influence of the stress state in a coal bump-prone deep coalbed: A case study [J]. Int J Rock Mech Min Sci, 2009, 46(2): 333-345

[19] HeJ, DouL-m, CaoA-y, GongS-y, LüJ-wei. Rock burst induced by roof breakage and its prevention [J]. Journal of Central South University Technology, 2012, 19(4): 1086-1091

[20] CaoA-y, DouL-m, YanR-l, JiangH, LuC-p, DuT-t, LuZ-yu. Classification of microseismic events in high stress zone [J]. Min Sci Tech^(China), 2009, 19(6): 718-723

[21] FengX-j, WangE-y, ShenR-x, WeiM-y, ChenY, CaoX-qi. The dynamic impact of rock burst induced by the fracture of the thick and hard key stratum [J]. Procedia Eng, 2011, 26(0): 457-465

[22] JiaP, ZhuW-cheng. Dynamic-static coupling analysis on rockburst mechanism in jointed rock mass [J]. Journal of Central South University, 2012, 19(11): 3285-3290

[23] QianM-g, ShiP-wuMine pressure and ground control [M], 2003, Xuzhou, China University of Mining and Technology Press

[24] CaoA-y, DouL-m, LiF-c, JiangH, QuY, HanR-jun. Study on characteristic of overburden movement in unsymmetrical isolated longwall mining using microseismic technique [J]. Procedia Eng, 2011, 26(0): 1253-1262

[25] JiangQ, FengX-t, XiangT-b, SuG-shao. Rockburst characteristics and numerical simulation based on a new energy index: A case study of a tunnel at 2500 m depth [J]. Bull Eng Geol Environ, 2010, 69(3): 381-388