An early warning method for water inrush in Dongjiahe coal mine based on microseismic moment tensor

Abstract

Dongjiahe Coal Mine belongs to the Carboniferous Permian coal field which has a high degree of karst and fissure development. This paper takes the working face of Dongjiahe Coal Mine as an example; through the microseismic(MS) monitoring system arranged on the working face, the moment tensor theory was used to invert the focal mechanism solution of the anomalous area of the floor MS event; combining the numerical simulation and field data, the underlying floor faults were identified by the stress inversion method. The results show that: 1) Moment tensors were decomposed into three components and the main type of rupture in this area is mixed failure according to the relative criterion; 2) The hidden fault belongs to the reversed fault, its dip angle is approximately 70°, and the rupture length is 21 m determined by the inversion method of the initial dynamic polarity and stress in the focal mechanism; 3) The failure process of the fault is divided into three stages by numerical simulation method combined with the temporal and spatial distribution of MS events. The results can provide a reference for early warning and evaluation of similar coal mine water inrush risks.

Keywords

moment tensor inversion / water inrush / fault recognition / realistic failure process analysis

References

[1] ZhangJ-C. Investigations of water inrushes from aquifers under coal seams [J]. International Journal of Rock Mechanics and Mining Sciences, 2005, 42(3): 350-360

[2] ZhangJ-C, ShenB-H. Coal mining under aquifers in China: a case study [J]. International Journal of Rock Mechanics and Mining Sciences, 2004, 41(4): 629-639

[3] WuQ, LiuY-Z, WuX-L, LiuS-Q, SunW-J, ZengY-F. Assessment of groundwater inrush from underlying aquifers in Tunbai coal mine, Shanxi Province, China [J]. Environmental Earth Sciences, 2016, 75(9): 737

[4] QiuM, ShiL-Q, TengC, ZhouY. Assessment of water inrush risk using the fuzzy Delphi analytic hierarchy process and grey relational analysis in the Liangzhuang coal mine, China [J]. Mine Water and the Environment, 2017, 36139-50

[5] ChengG-WStudy on microseismic monitoring technique for micro-fracture precursor information of water inrush [D], 2017, Dalian, Dalian University of Technology(in Chinese)

[6] LiZ-H, FengG-R, ZhaiC-Z. Study on “triangle” water-inrush mode of strong water-guide collapse column [J]. Journal of Central South University, 2016, 23(9): 2402-2409

[7] HuY-B, LiW-P, WangQ-Q, LiuS-L, WangZ-K. Evolution of floor water inrush from a structural fractured zone with confined water [J]. Mine Water and the Environment, 2019, 38(2): 252-260

[8] LiuZ-X, HanK-W, YangS, LiuY-X. Fractal evolution mechanism of rock fracture in undersea metal mining [J]. Journal of Central South University, 2020, 27(4): 1320-1333

[9] LuY L, ElsworthD, WangL G. Microcrack-based coupled damage and flow modeling of fracturing evolution in permeable brittle rocks [J]. Computers and Geotechnics, 2013, 49: 226-244

[10] PoulsenB A, AdhikaryD, GuoH. Simulating mining-induced strata permeability changes [J]. Engineering Geology, 2018, 237: 208-216

[11] YanC-Z, JiaoY-Y. A 2D fully coupled hydro-mechanical finite-discrete element model with real pore seepage for simulating the deformation and fracture of porous medium driven by fluid [J]. Computers & Structures, 2018, 196: 311-326

[12] ZhouW-L, ZhangP-S, WuR-X, HuX-Y. Dynamic monitoring the deformation and failure of extra-thick coal seam floor in deep mining [J]. Journal of Applied Geophysics, 2019, 163: 132-138

[13] LiH, BaiH-B, WuJ-J, MengQ-B, MaK, WuL-Y, MengF-F, WangS-J. A set of methods to predict water inrush from an Ordovician karst aquifer: A case study from the Chengzhuang mine, China [J]. Mine Water and the Environment, 2019, 38(1): 39-48

[14] CaoA-Y, DouL-M, LuoX, ZhengY-D, HuangJ-L, AndrewK. Seismic effort of blasting wave transmitted in coal-rock mass associated with mining operation [J]. Journal of Central South University, 2012, 19(9): 2604-2610

[15] MaK, TangC A, XuN W, LiuF, XuJ W. Failure precursor of surrounding rock mass aroundcross tunnel in high-steep rock slope [J]. Journal of Central South University, 2013, 20(1): 207-217

[16] LiZ-L, DouL-M, WangG-F, CaiW, HeJ, DingY-L. Risk evaluation of rock burst through theory of static and dynamic stresses superposition [J]. Journal of Central South University, 2015, 22(2): 676-683

[17] HongY-D, LinB-Q, ZhuC-J, WangZ, LiuJ-Q, SaffariP, NieW. Image and ultrasonic analysis-based investigation of coal core fracturing by microwave energy [J]. International Journal of Rock Mechanics and Mining Sciences, 2020, 127: 104232

[18] LiT, MeiT-T, SunX-H, LvY, ShengJ-Q, CaiM. A study on a water-inrush incident at Laohutai coalmine [J]. International Journal of Rock Mechanics and Mining Sciences, 2013, 59151-159

[19] ChengS, LiS-C, LiL-P, ShiS-S, ZhouZ-Q, WangJ. Study on energy band characteristic of microseismic signals in water inrush channel [J]. Journal of Geophysics and Engineering, 2018, 15(5): 1826-1834

[20] OhtsuM. Acoustic emission theory for moment tensor analysis [J]. Research in Nondestructive Evaluation, 1995, 6(1): 169-184

[21] OhtsuM, UddinF A K M. Mechanisms of corrosion-induced cracks in concrete at meso- and macro-scales [J]. Journal of Advanced Concrete Technology, 2008, 6(3): 419-429

[22] ChangS H, LeeC I. Estimation of cracking and damage mechanisms in rock under triaxial compression by moment tensor analysis of acoustic emission [J]. International Journal of Rock Mechanics and Mining Sciences, 2004, 41(7): 1069-1086

[23] GrahamC C, StanchitsS, MainI G, DresenG. Comparison of polarity and moment tensor inversion methods for source analysis of acoustic emission data [J]. International Journal of Rock Mechanics and Mining Sciences, 2010, 47(1): 161-169

[24] ZhouJ-R, WeiJ, YangT-H, ZhuW-C, LiL-C, ZhangP-H. Damage analysis of rock mass coupling joints, water and microseismicity [J]. Tunnelling and Underground Space Technology, 2018, 71: 366-381

[25] AkiK, RichardsPQuantitative seismology [M], 20022nd ed.Sauashito, University Science Books

[26] KnopoffL, RandallM J. The compensated linear-vector dipole: A possible mechanism for deep earthquakes [J]. Journal of Geophysical Research, 1970, 75(26): 4957-4963

[27] TangL-Z, JianY-H, LiD-Y, WangC. Analysis of damage mechanism for surrounding rock based on microseismic moment tensor [J]. Rock and Soil Mechanics, 2017, 38(5): 1436-1444(in Chinese)

[28] VavryčukV. Focal mechanisms in anisotropic media [J]. Geophysical Journal International, 2005, 161(2): 334-346

[29] VavryčukV. Tensile earthquakes: Theory, modeling, and inversion [J]. Journal of Geophysical Research: Solid Earth, 2011, 116(B12): B12320

[30] LAY T, WALLACE T C. Modern global seismology (Vol. 58) [M]. Elsevier, 1995.

[31] LundB, SlungaR. Stress tensor inversion using detailed microearthquake information and stability constraints: Application to Ölfus in southwest Iceland [J]. Journal of Geophysical Research: Solid Earth, 1999, 104B714947-14964

[32] MichaelA J. Determination of stress from slip data: Faults and folds [J]. Journal of Geophysical Research: Solid Earth, 1984, 89(B13): 11517-11526

[33] OhtsuM. Prospective applications of AE measurements to infra-dock of concrete structures [J]. Construction and Building Materials, 2018, 158: 1134-1142

[34] MadariagaR. Dynamics of an expanding circular fault [J]. Bulletin of the Seismological Society of America, 1976, 66(3): 639-666

[35] TangC A, ThamL G, LeeP K K, YangT H, LiL C. Coupled analysis of flow, stress and damage (FSD) in rock failure [J]. International Journal of Rock Mechanics and Mining Sciences, 2002, 39(4): 477-489

[36] SchulzeO, PoppT, KernH. Development of damage and permeability in deforming rock salt [J]. Engineering Geology, 2001, 61(23): 163-180

[37] SouleyM, HomandF, PepaS, HoxhaD. Damage-induced permeability changes in granite: A case example at the URL in Canada [J]. International Journal of Rock Mechanics and Mining Sciences, 2001, 38(2): 297-310

[38] LouisC, MainiY N. Determination of in-situ hydraulic parameters in jointed rock [J]. International Society of Rock Mechanics Proceedings, 1970, 1(1–19): 235-245