Mechanical properties and energy evolution of jointed rock specimens containing an opening under uniaxial loading

Abstract

To investigate the impact of an opening and joints with different inclination angles on the mechanical response behavior, the energy evolution characteristics, and distribution law of granite specimens, uniaxial loading tests were performed on the parallel jointed rock samples with an opening. Results indicated an initial decreasing trend of the strength and deformation parameters, which later increases with increased inclination angle, reaching minimum values when the inclination angle is 45°. Evolution curves of the elastic strain energy and dissipated energy with strain of the samples showed step-like gradual mutation characteristics. The peak total energy, peak elastic strain energy, peak dissipated energy, and total input energy during the failure of the samples showed significant nonlinear characteristics with increasing inclination angle. The opening and joints as well as the change of the inclination angle had significant influences on the proportion of the elastic strain energy of the samples prior to the peak, resulting in the difference of the distribution law of input energy. Moreover, the energy mechanism of the sample failure was discussed. Results showed that the energy release was the internal cause of the sudden destruction of the entire rock mass.

Keywords

rock mechanics / mechanical properties / energy evolution / jointed rock specimens containing an opening / uniaxial loading

References

[1] You MQ, Hua AZ. Energy analysis on failure process of rock specimen. Chin. J. Rock Mech. Eng., 2002, 21(6): 778

[2] Xie HP, Peng RD, Ju Y. Energy dissipation of rock deformation and fracture. Chin. J. Rock Mech. Eng., 2004, 23(21): 3565

[3] Xie HP, Peng RD, Ju Y, Zhou HW. On energy analysis of rock failure. Chin. J. Rock Mech. Eng., 2005, 24(15): 2603

[4] Zhang ZZ, Gao F. Research on nonlinear characteristics of rock energy evolution under uniaxial compression. Chin. J. Rock Mech. Eng., 2012, 31(6): 1198

[5] Zuo JP, Huang YM, Xiong GJ, Liu J, Li MM. Study of energy-drop coefficient of brittle rock failure. Rock Soil Mech., 2014, 35(2): 321

[6] Li ZY, Wu G, Huang TZ, Liu Y. Variation of energy and criteria for strength failure of shale under traixial cyclic loading. Chin. J. Rock Mech. Eng., 2018, 37(3): 662

[7] Gong FQ, Luo S, Li XB, Yan JY. Linear energy storage and dissipation rule of red sandstone materials during the tensile failure process. Chin. J. Rock Mech. Eng., 2018, 37(2): 352

[8] Liu WL, Yan EC, Dai H, Du Y, Xiao WB, Zhao S. Study on characteristic strength and energy evolution law of Badong formation mudstone under water effect. Chin. J. Rock Mech. Eng., 2020, 39(2): 311

[9] Meng QB, Wang CK, Huang BX, Pu H, Zhang ZZ, Sun W, Wang J. Rock energy evolution and distribution law under triaxial cyclic loading and unloading conditions. Chin. J. Rock Mech. Eng., 2020, 39(10): 2047

[10] Chen GQ, Wu JC, Jiang WZ, Li SJ, Qiao ZB, Yang WB. An evaluation method of rock brittleness based on the whole process of elastic energy evolution. Chin. J. Rock Mech. Eng., 2020, 39(5): 901

[11] Bieniawski ZT, Bernede MJ. Suggested methods for determining the uniaxial compressive strength and deformability of rock materials: Part 1. Suggested method for determining deformability of rock materials in uniaxial compression. Int. J. Rock Mech. Min. Sci. Geomech. Abstr., 1979, 16(2): 138.

[12] Weng L, Li XB, Taheri A, Wu QH, Xie XF. Fracture evolution around a cavity in brittle rock under uniaxial compression and coupled static-dynamic loads. Rock Mech. Rock Eng., 2018, 51(2): 531.

[13] Zhao XG, Cai M, Wang J, Ma LK. Damage stress and acoustic emission characteristics of the Beishan granite. Int. J. Rock Mech. Min. Sci., 2013, 64, 258.

[14] Hajiabdolmajid V, Kaiser PK, Martin CD. Modelling brittle failure of rock. Int. J. Rock Mech. Min. Sci., 2002, 39(6): 731.

[15] Zhou ZL, Tan LH, Cao WZ, Zhou ZY, Cai X. Fracture evolution and failure behaviour of marble specimens containing rectangular cavities under uniaxial loading. Eng. Fract. Mech., 2017, 184, 183.

[16] Li P, Ren FH, Cai MF, Guo QF, Wang HF, Liu K. Investigating the mechanical and acoustic emission characteristics of brittle failure around a circular opening under uniaxial loading. Int. J. Miner. Metall. Mater., 2019, 26(10): 1217.

[17] Zhou XP, Zhang J Z, Qian QH, Niu Y. Experimental investigation of progressive cracking processes in granite under uniaxial loading using digital imaging and AE techniques. J. Struct. Geol., 2019, 126, 129.

[18] He XQ, Zhou C, Song DZ, Li ZL, Gao AY, He SQ, Khan M. Mechanism and monitoring and early warning technology for rockburst in coal mines. Int. J. Miner. Metall. Mater., 2021, 28(7): 1097.

[19] Li P, Cai MF. Energy evolution mechanism and failure criteria of jointed surrounding rock under uniaxial compression. J. Cent. South Univ., 2021, 28(6): 1857.

[20] Zhang ZZ, Gao F. Confining pressure effect on rock energy. Chin. J. Rock Mech. Eng., 2015, 34(1): 1

[21] Xie HP, Ju Y, Li LY. Criteria for strength and structural failure of rocks based on energy dissipation and release principles. Chin. J. Rock Mech. Eng., 2005, 24(17): 3003

[22] Li P, Cai MF, Guo QF, Miao SJ. Characteristics and implications of stress state in a gold mine in Ludong area, China. Int. J. Miner. Metall. Mater., 2018, 25(12): 1363.

[23] X.H. Wu, Q.F. Guo, P. Li, F.H. Ren, J. Zhang, and M.F. Cai, Investigating the effect of temperature changes on the physical field of surrounding rock in a deep gold mine, Adv. Mater. Sci. Eng., 2021(2021), art. No. 8490864.

[24] Li P, Cai MF, Guo QF, Miao SJ. In situ stress state of the northwest region of the Jiaodong peninsula, China from overcoring stress measurements in three gold mines. Rock Mech. Rock Eng., 2019, 52, 4497.

[25] P. Li, Y.Q. Wu, and Y. Zhang, Mechanical and acoustic responses of brittle geomaterials with a hole under a compressive disturbance, Adv. Mater. Sci. Eng., 2021(2021), art. No. 5292925.