Browse > Article
http://dx.doi.org/10.12989/cac.2020.25.2.145

Study on the propagation mechanism of stress wave in underground mining  

Liu, Fei (Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization, Institute of Deep Earth Sciences and Green Energy, College of Civil and Transportation Engineering, Shenzhen University)
Li, Lianghui (College of Energy & Mining, China University of Mining & Technology)
Publication Information
Computers and Concrete / v.25, no.2, 2020 , pp. 145-154 More about this Journal
Abstract
For the influence of the propagation law of stress wave at the coal-rock interface during the pre-blasting of the top coal in top coal mining, the ANSYS-LS/DYNA fluid-solid coupling algorithm was used to numerical calculation and the life-death element method was used to simulate the propagation of explosion cracks. The equation of the crushing zone and the fracturing zone were derived. The results were calculated and showed that the crushing radius is 14.6 cm and the fracturing radius is 35.8 cm. With the increase of the angles between the borehole and the coal-rock interface, the vibration velocity of the coal particles and the rock particles at the interface decreases gradually, and the transmission coefficient of the stress wave from the coal mass into the rock mass decreases gradually. When the angle between the borehole and the coal-rock interface is 0°, the overall crushing degree is about 11% and up to the largest. With the increase of the distance from the charge to the coal-rock interface, the stress wave transmission coefficient and the crushing degree of the coal-rock are gradually decreased. At the distance of 50 cm, the crushing degree of the coal-rock reached the maximum of approximately 12.3%.
Keywords
coal-rock interface; stress wave; crushing degree; transmission coefficient;
Citations & Related Records
Times Cited By KSCI : 10  (Citation Analysis)
연도 인용수 순위
1 Аh, Х. (1980), Physical Process of Rock Blasting in Minin, Metallurgical Industry Press Beijing.
2 Bai, J.Z. (2005), Theoretical Basis and Case Analysis of LS-DYNA3D, Science Press, Beijing.
3 Biao, L. and Guoliang, B. (2019), "Finite element modeling of bond-slip performance of section steel reinforced concrete", Comput. Concrete, 24(3), 237-247. https://doi.org/10.12989/cac.2019.24.3.237.   DOI
4 Byers, B.W. (2002), "Critical review of theories of steady non-ideal two-dimensional detonation of condensed explosives, Confidential Report to HSBM participants, Mass Action, UK.
5 Chun-rui, L., Li-jun, K., Qing-xing, Q., De-bing, M., Quan-ming, L. and Gang, X. (2009), "The numerical analysis of borehole blasting and application in coal mine roof-weaken", Procedia Earth Planet. Sci., 1, 451-459. https://doi.org/10.1016/j.proeps.2009.09.072.   DOI
6 Cooper, P.W. (1996), Explosives Engineering, VCH Publishers Inc., New York, USA.
7 Dai, J. (2002), Rock Dynamics and Blasting Theory, Metallurgical Industry Press, Beijing.
8 Esen, S. (2008), "A non-Ideal detonation model for evaluating the performance of explosives in rock blasting", Rock Mech. Rock Eng., 41(3), 467-497. https://doi.org/10.1007/s00603-006-0119-2.   DOI
9 Hao, Y.X. (2016), "Study on rockburst of wudong near-vertical coal seams and impact protection with constant resistance and large deformation supporting", China University of Mining and Technology, Beijing.
10 Kury, J.W., Hornig, H.C., Lee, E.L., McDonnel, J.L., Ornellas, D.L., Finger, M., ... & Wilkins, M.L. (1965), "Metal acceleration by chemical explosives", Proceedings of the Fourth Symposium (International) on Detonation, US Government Printing Office Washington, DC, October.
11 Lee, E.L., Hornig, H.C. and Kury, J.W. (1968), "Adiabatic expansion of high explosive detonation products", Report UCRL-50422, University of California, Lawrence Radiation Laboratory, Livermore, CA, USA.
12 Livermore Software Technology Corporation (LSTC) (2003), LS-DYNA Keyword User's Manual, Version 970, Livermore, CA.
13 Li, S., Fan, C., Luo, M., Yang, Z., Lan, T. and Zhang, H. (2017), "Structure and deformation measurements of shallow overburden during top coal caving longwall mining", Int. J. Min. Sci. Tech., 6(27), 1081-1085. https://doi.org/10.1016/j.ijmst.2017.06.005.
14 Li, Z.L., He, X.Q., Dou, L.M., Song, D.Z. and Wang, G.F. (2018), "Numerical investigation of load shedding and rockburst reduction effects of top-coal caving mining in thick coal seams", Int. J. Rock Mech. Min. Sci., 110, 266-278. https://doi.org/10.1016/j.ijrmms.2018.08.005.   DOI
15 Liu, F., Silva, J., Yang, S., Lv, H. and Zhang, J. (2019), "Influence of explosives distribution on coal fragmentation in top-coal caving mining", Geomech. Eng., 18(2), 111-119. https://doi.org/10.12989/gae.2019.18.2.111.   DOI
16 Lu, C.P., Dou, L.M., Liu, B., Xie, Y.S. and Liu, H.S. (2012), "Microseismic low-frequency precursor effect of bursting failure of coal and rock", J. Appl. Geophys., 79, 55-63. https://doi.org/10.1016/j.jappgeo.2011.12.013.   DOI
17 Mahdi, A., Roozbeh, T. and Aliakbar, Y. (2019), "Simulation of cyclic response of precast concrete beam-column joints", Comput. Concrete, 24(3), 223-236. https://doi.org/10.12989/cac.2019.24.3.223.   DOI
18 Naseri, R. and Behfarnia, K. (2019), "A numerical study on the seismic behavior of a composite shear wall", Comput. Concrete, 22(3), 279-289. https://doi.org/10.12989/cac.2018.22.3.279.   DOI
19 Nicieza, C.G., Diaz, M.R., Fernandez, M.A. and Vigil, A.A. (2012), "Characterization of ground from the point of view of its excavatability", Eng. Geol., 12(6), 8-18. https://doi.org/10.1016/j.enggeo.2011.11.004.
20 Pradhan, S.P., Vishal, V. and Singh, T.N. (2018), "Finite element modelling of landslide prone slopes around Rudraprayag and Agastyamuni in Uttarakhand Himalayan terrain", Nat. Hazard., 94(1), 181-200. https://doi.org/10.1007/s11069-018-3381-1.   DOI
21 Prem, P.R., Thirumalaiselvi, A. and Verma, M. (2019). "Applied linear and nonlinear statistical models for evaluating strength of Geopolymer concrete", Comput. Concrete, 24(1), 7-17. https://doi.org/10.12989/cac.2019.24.1.007.   DOI
22 Saiang, D. (2009), "Stability analysis of the blast-induced damage zone by continuum and coupled continuum-discontinuum methods", Eng. Geol., 116, 1-11. https://doi.org/10.1016/j.enggeo.2009.07.011.   DOI
23 Sanchidrian, J.A., Castedo, R., Lopez, L.M., Segarra, P. and Santos, A.P. (2015), "Determination of the JWL constants for ANFO and emulsion explosives from cylinder test data", Central Eur. J. Energ. Mater., 12(2), 177-194.
24 Wang, F., Tu, S., Yuan, Y., Feng, Y., Chen, F. and Tu, H. (2013), "Deep-hole pre-split blasting mechanism and its application for controlled roof caving in shallow depth seams", Int. J. Rock Mech. Min. Sci., 64, 112-121. https://doi.org/10.1016/j.ijrmms.2013.08.026.   DOI
25 Shang, X.J., Su, J.Y. et al. (2005), Dynamic Analysis Method and Engineering Example of ANSYS/LS-DYNA3D, China Water Conservancy and Hydropower Press, Beijing.
26 Shi, D.Y., Li, Y.C. and Zhang, S.M. (2005), Display Dynamic Analysis Based on ANSYS/LS-DYNA8.1, Tsinghua University Press, Beijing.
27 Suo, Y.L. (2004), "Basic study on technology of pre-blast weakening hard top coal in fully mechanized caving faces", Xi'an University of Science and Technology, Xi'an.
28 Wang, J. and Li, Y. (2017), "Thick seam coal mining and its ground control", Adv. Coal Mine Ground Control, 379-407. https://doi.org/10.1016/B978-0-08-101225-3.00008-6.
29 Wang, J.C., Chen, Z.H., Bai, X.J. et al. (2000), "Study on parameters of pre-blasting of top coal in fully mechanized mining of hard thick seam", Coal, 3, 1-4.
30 Xu, T. (2019), "Blasting vibration safety criterion of surrounding rock of a circular tunnel", Geotech Geol Eng., 37(4), 3077-3084. https://doi.org/10.1007/s10706-019-00826-z.   DOI
31 Zhao, J. and Cai, J.G. (2001), "Transmission of elastic P-waves across single fractures with a nonlinear normal deformational behavior", Rock Mech. Rock Eng., 34, 5-15.
32 Yan, P., Zhao, Z., Lu, W., Fan, Y., Chen, X. and Shan, Z. (2015), "Mitigation of rock burst events by blasting techniques during deep-tunnel excavation", Eng. Geol., 18(8), 126-136. https://doi.org/10.1016/j.enggeo.2015.01.011.
33 Yang, J.X. (2015), "Study on confined blasting control mechanism of hard coal rock with high safety and efficiency and test analysis", China University of Mining and Technology, Xuzhou.
34 Yang, S.Y. (1993), Dynamics Foundation of Rock Blasting, Coal Industry Press, Beijing.
35 Yasitli, N.E. and Unver, B. (2005), "3D numerical modeling of longwall mining with top coal caving", Int. J. Rock Mech. Min. Sci., 42(2), 219-235.   DOI
36 Zhang, Q. (1998), Analysis and Application of Dynamics Blasting Engineering, Coal Industry Press, Beijing.
37 Zhao, J.J., Zhang, Y. and Ranjith, P.G. (2017), "Numerical simulation of blasting-induced fracture expansion in coal masses", Int. J. Rock Mech. Min. Sci., 100, 28-39.   DOI