Jiyu Zheng, Longkang Wang

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After the gas drainage borehole is formed in the coal seam, its stress deformation process is a creep process without the influence of mining. By arranging boreholes on coal samples and carrying out creep loading test of porous coal through rock mechanics testing machine, the creep process of boreholes in actual coal seams is simulated. The results show that the creep loading test results of drilled coal are quite different from those of conventional loading. Creep loading produces large deformation due to rheological and aging characteristics. Compared with non-porous coal, the yield of drilled coal occurs earlier and the yield platform is wider during creep loading. Also, the larger the borehole diameter, the deeper the borehole depth, and the lower the peak stress. The up dip angle is easier to destroy than the down dip angle. Compared with hard coal, soft coal produces greater deformation under smaller peak stress. The research results have guiding significance for drilling gas drainage in the soft coal seam.


Influencing factors, Porous coal, Creep, Destruction

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Li, H.M., Li, Z.H., Su, C., 2004, Testing study on creep characteristics of marble, Chinese Journal of Rock Mechanics and Engineering, 23(22), pp. 3745-3749.

Brantut, N., Heap, M.J., Meredith, P.G., Baud, P., 2013, Time-dependent cracking and brittle creep in crustal rocks: A review, Journal of Structural Geology, 52, pp. 17-43.

Li, Y.S., 1995, Creep and relaxation of 4 kinds of rock under uniaxial compression tests, Chinese Journal of Rock Mechanics and Engineering, 14(1), pp. 39-47

Wu, F., Zhou, X., Ying, P., Li, C., Zhu, Z., Chen, J., 2022, A study of uniaxial acoustic emission creep of salt rock based on improved fractional-order derivative, Rock Mechanics and Rock Engineering, 55(3), pp. 1619-1631.

Petružálek, M., Vilhelm, J., Rudajev, V., Lokajíček, T., Svitek, T., 2013, Determination of the anisotropy of elastic waves monitored by a sparse sensor network, International Journal of Rock Mechanics and Mining Sciences, 60, pp. 208-216.

Charalampidou, E.M., Hall, S.A., Stanchits, S., Viggiani, G., Lewis, H., 2014, Shear-enhanced compaction band identification at the laboratory scale using acoustic and full-field methods, International Journal of Rock Mechanics and Mining Sciences, 67, pp. 240-252.

Graham, C.C., Stanchits, S., Main, I.G., Dresen, G., 2010, Comparison of polarity and moment tensor inversion methods for source analysis of acoustic emission data, International Journal of Rock Mechanics and Mining Sciences, 47(1), pp. 161-169.

Shao, J.F., Zhu, Q.Z., Su, K., 2003, Modeling of creep in rock materials in terms of material degradation, Computers and Geotechnics, 30(7), pp. 549-555.

Huang, M., Zhan, J. W., Xu, C.S., Jiang, S., 2020, New creep constitutive model for soft rocks and its application in the prediction of time-dependent deformation in tunnels, International Journal of Geomechanics, 20(7), pp. 04020096.

Wang, Y., Cui, F., 2018, Energy evolution mechanism in process of Sandstone failure and energy strength criterion, Journal of Applied Geophysics, 154, pp. 21-28.

Li, D., Sun, Z., Xie, T., Li, X., Ranjith, P.G., 2017, Energy evolution characteristics of hard rock during triaxial failure with different loading and unloading paths, Engineering Geology, 228, pp. 270-281.

Zhang, R., Ai, T., Li, H., Zhang, Z., Liu, J., 2013, 3D reconstruction method and connectivity rules of fracture networks generated under different mining layouts, International Journal of Mining Science and Technology, 23(6), pp. 863-871.

Huang, P., Zhang, J., Spearing, A.S., Chai, J., Dong, C., 2021, Experimental study of the creep properties of coal considering initial damage, International Journal of Rock Mechanics and Mining Sciences, 139, pp. 104629.

Tang, C.A., Lin, P., Wong, R.H.C., Chau, K.T., 2001, Analysis of crack coalescence in rock-like materials containing three flaws-part II: Numerical approach. International Journal of Rock Mechanics and Mining Sciences, 38(7), pp. 925-939.

Heap, M.J., Baud, P., Meredith, P.G., Vinciguerra, S., Bell, A.F., Main, I.G., 2011, Brittle creep in basalt and its application to time-dependent volcano deformation, Earth and Planetary Science Letters, 307(1-2), pp. 71-82.

Wang, X.K., Xia, C.C., Zhu, Z.M., Xie, W., Song, L., Han, G., 2021, Long-term creep law and constitutive model of extremely soft coal rock subjected to single-stage load, Rock Soil Mech, 42, pp. 2078-2088.

Chen, X., Li, J.L., Deng, H.F., Dang, L., Liu, Q., Wang, X.X., Wang, W., 2023, Uncoordinated deformation of soft and hard interconnecting strata under unloading creep conditions, Rock and Soil Mechanics, 44(1), pp. 303-316.

Zhou, J., Zhang, J., Wang, J., Li, F., Zhou, Y., 2022, Research on nonlinear damage hardening creep model of soft surrounding rock under the stress of deep coal resources mining, Energy Reports, 8, pp. 1493-1507.

Guner, D., Golbasi, O., Ozturk, H., 2022, Generic creep behavior and creep modeling of an aged surface support liner under tension, Journal of Rock Mechanics and Geotechnical Engineering, 14(2), pp. 377-384.

Wang, J., Li, J., Shi, Z., 2022, Crack evolution law and failure mode of red sandstone under fatigue–creep interaction, Fatigue & Fracture of Engineering Materials & Structures, 45(1), pp. 270-284.

Ma, Z., Zhang, C., Gamage, R.P., Zhang, G., 2022, Uncovering the creep deformation mechanism of rock-forming minerals using nanoindentation, International Journal of Mining Science and Technology, 32(2), pp. 283-294.

Zhang, B., Liang, Y., Zou, Q., Ning, Y., Liu, H., 2023, Creep behavior of coal after cyclic loading and unloading and its effect on mining-induced stress boundary, International Journal of Geomechanics, 23(4), pp. 565-576.

Ding, Z., Feng, X., Wang, E., Sa, L., Wang, D., Zhang, Q., Hu, Q., Zhao, X., 2023, Fracture response and damage evolution features of coal considering the effect of creep damage under dynamic loading, Engineering Failure Analysis, 29(3), pp. 411-423.

DOI: https://doi.org/10.22190/FUME231205011Z


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ISSN: 2335-0164 (Online)

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