Analysis of Stress Removal Effect of Borehole Depth and Position on Coal-Rock with Shock Tendency
Tóm tắt
With the increase of mining depth and scale, mine dynamic disasters related to coal-rock instability, such as rock burst, are becoming more and more serious, so it is very urgent to predict them accurately. At present, the method of borehole pressure relief is relatively effective for the prediction and control of rock burst. In this paper, the numerical simulation software PFC was used to study the influence of different drilling depth and location on mechanical properties, acoustic emission characteristics and damage evolution characteristics of coal-rock mass. The results show that the greater the drilling depth and the closer the drilling location is to the upper coal seam, the better the effect of destabilizing the impact-prone coal seam is. With the increase of drilling depth, the maximum value of acoustic emission events in coal-rock mass decreases first, and then stabilizes; with the increase of drilling location (height), the maximum value of acoustic emission events in coal-rock mass increases first, and then decreases; the stability of coal-rock can be monitored by the evolution law of acoustic emission. The failure modes of coal-rock samples with different drilling depths and locations are different, and large cracks mostly exist in the local part of coal-rock samples. The damage evolution of coal-rock mass can be divided into three stages: initial non-damage stage, slow increase stage and rapid increase stage. Different drilling depth and location have different effects on rock damage evolution characteristics.
Tài liệu tham khảo
Bukowska M (2006) The probability of rockburst occurrence in the Upper Silesian Coal Basin area dependent on natural mining conditions. J Min Sci 42(6):570–577. https://doi.org/10.1007/s10913-006-0101-0
Castro-Filgueira U, Alejano LR, Arzúa J, Ivars DM (2017) Sensitivity analysis of the micro-parameters used in a PFC analysis towards the mechanical properties of rocks. Proc Eng 191:488–495. https://doi.org/10.1016/j.proeng.2017.05.208
Cai M, Kaiser PK, Morioka H, Minami M, Maejima T, Tasaka Y, Kurose H (2007) FLAC/PFC coupled numerical simulation of AE in large-scale underground excavations. Int J Rock Mech Min Sci 44:550–564. https://doi.org/10.1016/j.ijrmms.2006.09.013
Cheng Z, Li L, Zhang Y (2019) Laboratory investigation of the mechanical properties of coal-rock combined body. Bull Eng Geol Environ. https://doi.org/10.1007/s10064-019-01613-z
Cinovic D, Silva MAG (1982) Statistical aspects of the continuous damage theory. Int J Solids Struct 18(7):551–562. https://doi.org/10.1016/0020-7683(82)90039-7
Cundall PA, Strack OD (1979) A discrete numerical model for granular assemblies. Geotechnique 29(1):47–65. https://doi.org/10.1680/geot.1979.29.1.47
Du S, Feng G, Li Z et al (2019) Measurement and prediction of granite damage evolution in deep mine seams using acoustic emission. Meas Sci Technol 30(11):114002
He H, Dou L, Fan J, Du T, Sun X (2012) Deep-hole directional fracturing of thick hard roof for rockburst prevention. Tunn Undergr Space Technol 32:34–43. https://doi.org/10.1016/j.tust.2012.05.002
Itasca Consulting Group Inc. (2014) PFC (particle flow code), version 5.0. ICG, Minneapolis
Jia C, Jiang Y, Zhang X (2017) Laboratory and numerical experiments on pressure relief mechanism of large-diameter boreholes. Chin J Geotech Eng 39:1115–1122. https://doi.org/10.11779/CJGE201706018
Konicek P, Soucek K, Stas L, Singh R (2013) Long-hole destress blasting for rockburst control during deep underground coal mining. Int J Rock Mech Min Sci 61:141–153. https://doi.org/10.1016/j.ijrmms.2013.02.001
Lan H, Qi Q, Pan J (2011) Analysis on features as well as prevention and control technology of mine strata pressure bumping in China. Coal Sci Technol 39(1):11–15
Leśniak A, Isakow Z (2009) Space–time clustering of seismic events and hazard assessment in the Zabrze-Bielszowice coal mine, Poland. Int J Rock Mech Min Sci 46(5):918–928. https://doi.org/10.1016/j.ijrmms.2008.12.003
Lemaitre J, Sermage JP, Desmorat R (1999) A two scale damage concept applied to fatigue. Int J Fract 97(1–4):67–81. https://doi.org/10.1023/A:1018641414428
Li Y, Zhang H, Zhu Z et al (2018) Study on safety parameters of pressure relief borehole in rockburst coal seam. China Saf Sci J 28(11):122–128
Liu W (2019) Experimental and numerical study of rock stratum movement characteristics in longwall mining. Shock Vib article ID 5041536. https://doi.org/10.1155/2019/5041536
Liu HG, He YN, Xu JH, Han LJ (2007) Numerical simulation and industrial test of boreholes destressing technology in deep coal tunnel. J China Coal Soc 32(1):33–37
Liu W, Yuan W, Yan Y et al (2019a) Analysis of acoustic emission characteristics and damage constitutive model of coal-rock combined body based on particle flow code. Symmetry 11(8):1040. https://doi.org/10.3390/sym11081040
Liu W, Liu J, Zhu C (2019b) Multi-scale effect of acoustic emission characteristics of 3D rock damage. Arab J Geosci 12(22):668
Lyu XZ, Zhao ZH, Wang XJ et al (2019) Study on the permeability of weakly cemented sandstones. Geofluids. https://doi.org/10.1155/2019/8310128
Paul A, Singh AP, Loui J et al (2012) Validation of RMR-based support design using roof bolts by numerical modeling for underground coal mine of Monnet Ispat, Raigarh, India—a case study. Arab J Geosci 5(6):1435–1448. https://doi.org/10.1007/s12517-011-0313-8
Qin Z, Fu H, Chen X (2019) A study on altered granite meso-damage mechanisms due to water invasion-water loss cycles. Environ Earth Sci 78(14):428. https://doi.org/10.1007/s12665-019-8426-6
Schumacher FP, Kim E (2013) Modeling the pipe umbrella roof support system in a Western US underground coal mine. Int J Rock Mech Min Sci 60:114–124. https://doi.org/10.1016/j.ijrmms.2012.12.037
Shkuratnik VL, Filimonov YL, Kuchurin SV (2004) Experimental investigations into acoustic emission in coal samples under uniaxial loading. J Min Sci 40(5):458–464. https://doi.org/10.1007/s10913-005-0030-3
Tan Y, Ma Q, Zhao Z et al (2019) Cooperative bearing behaviors of roadside support and surrounding rocks along gob-side. Geomech Eng 18(4):439–448. https://doi.org/10.12989/gae.2019.18.4.439
Vishal V, Ranjith PG, Singh TN (2015) An experimental investigation on behaviour of coal under fluid saturation, using acoustic emission. J Nat Gas Sci Eng 22:428–436. https://doi.org/10.1016/j.jngse.2014.12.020
Wang X, Tian L (2018) Mechanical and crack evolution characteristics of coal-rock under different fracture-hole conditions: a numerical study based on particle flow code. Environ Earth Sci 77(8):297. https://doi.org/10.1007/s12665-018-7486-3
Wang X, Meng F (2018) Statistical analysis of large accidents in China’s coal mines in 2016. Nat Hazards 92(1):311–325. https://doi.org/10.1007/s11069-018-3211-5
Wang X, Wen Z, Jiang Y et al (2018) Experimental study on mechanical and acoustic emission characteristics of rock-like material under non-uniformly distributed loads. Rock Mech Rock Eng 51(3):729–745. https://doi.org/10.1007/s00603-017-1363-3
Wang J, Li S, Li L et al (2019) Attribute recognition model for risk assessment of water inrush. Bull Eng Geol Environ 78(2):1057–1071. https://doi.org/10.1007/s10064-017-1159-4
Zhang CP, Cheng P, Ranjith PG et al (2020) A comparative study of fracture surface roughness and flow characteristics between CO2 and water fracturing. J Nat Gas Sci Eng 76:103188. https://doi.org/10.1016/j.jngse.2020.103188