Abstract
This study aimed to explore the effect of four-sided rapid unloading on delayed pillar rockbursts under high pressures. To this end, true triaxial four-sided rapid unloading rockbursts and uniaxial compression experiments were conducted on two sandstones with different strengths. The differences in damage under two different loading paths and characteristics of the rapid unloading point of the pillar rockburst were analyzed. The results indicate that rapid unloading on the four sides under true triaxial high-pressure loading caused unloading damage. The stress and strain at the rapid unloading point would produce an unloading platform, and the acoustic emission (AE) signal and dissipated energy would increase rapidly. The rapid unloading damage in the elastic stage is mainly caused by the tension cracks generated around the specimen because of the rapid expansion of the specimen. As the center part of the specimen was not affected, the stress–strain curve after unloading was still in the elastic stage. Although the initial stress of the high-strength sandstone pillar rockburst during rapid unloading was higher than that of low-strength sandstone, the unloading damage caused was less than that of low-strength sandstone, indicating that rapid unloading damage is closely related to the rock properties.
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Data generated or analyzed during this study are available from the corresponding author upon reasonable request.
References
Akdag S, Karakus M, Taheri A (2018) Effects of thermal damage on strain burst mechanism for brittle rocks under true-triaxial loading conditions. Rock Mech Rock Eng 51(6):1657–1682. https://doi.org/10.1007/s00603-018-1415-3
Bagde MN, Petroš V (2005) Fatigue properties of intact sandstone samples subjected to dynamic uniaxial cyclical loading. Int J Rock Mech Min 42(2):237–250. https://doi.org/10.1016/j.ijrmms.2004.08.008
Cai MF, Wang J, Wang S (2001) Prediction of rock burst with deep mining excavation in Linglong gold mine. Int J Min Met Mater 8(4):241–243
Cai M, Kaiser PK, Morioka H (2007) FLAC/PFC coupled numerical simulation of AE in large-scale underground excavations. Int J Rock Mech Min 44(4):550–564. https://doi.org/10.1016/j.ijrmms.2006.09.013
Carter JP, Booker JR (1990) Sudden excavation of a long circular tunnel in elastic ground. Int J Rock Mech Min Sci Geomech Abstr 27(2):129–132 (Pergamon)
Cook NGW (1963) The basic mechanics of rockbursts. J S Afr I Min Metall 64(3):71–81. https://hdl.handle.net/10520/AJA0038223X_3752
Du K, Tao M, Li X (2016) Experimental study of slabbing and rockburst induced by true-triaxial unloading and local dynamic disturbance. Rock Mech Rock Eng 49(9):3437–3453. https://doi.org/10.1007/s00603-016-0990-4
Du K, Li XF, Tao M, Wang SF (2020) Experimental study on acoustic emission (AE) characteristics and crack classification during rock fracture in several basic lab tests. Int J Rock Mech Min 133:104411. https://doi.org/10.1016/j.ijrmms.2020.104411
Ge ZL, Sun Q (2018) Acoustic emission (AE) characteristics of granite after heating and cooling cycles. Eng Fract Mech 200:418–429. https://doi.org/10.1016/j.engfracmech.2018.08.011
Gong YX, Song ZJ, He MC (2017) Precursory waves and eigenfrequencies identified from acoustic emission data based on singular spectrum analysis and laboratory rock-burst experiments. Int J Rock Mech Min 91:155–169. https://doi.org/10.1016/j.ijrmms.2016.11.020
Gong FQ, Wu C, Luo S (2019) Load–unload response ratio characteristics of rock materials and their application in prediction of rockburst proneness. Bull Eng Geol Environ 78(7):5445–5466. https://doi.org/10.1007/s10064-019-01474-6
Gong F, Luo S, Jiang Q (2022) Theoretical verification of the rationality of strain energy storage index as rockburst criterion based on linear energy storage law. J Rock Mech Geotech 14(6):1737–1746. https://doi.org/10.1016/j.jrmge.2021.12.015
Hardy HR (1972) Application of acoustic emission techniques to rock mechanics research. Acoust Emission, ASTM STP 505:41–83
He MC, Miao JL, Feng JL (2010) Rock burst process of limestone and its acoustic emission characteristics under true-triaxial unloading conditions. Int J Rock Mech Min 47(2):286–298. https://doi.org/10.1016/j.ijrmms.2009.09.003
He MC, Jia XN, Coli M (2012a) Experimental study of rockbursts in underground quarrying of Carrara marble. Int J Rock Mech Min 52:1–8. https://doi.org/10.1016/j.ijrmms.2012.02.006
He MC, Nie W, Zhao ZY (2012b) Experimental investigation of bedding plane orientation on the rockburst behavior of sandstone. Rock Mech Rock Eng 45(3):311–326. https://doi.org/10.1007/s00603-011-0213-y
He MC, Zhao F, Cai M (2015) A novel experimental technique to simulate pillar burst in laboratory. Rock Mech Rock Eng 48(5):1833–1848. https://doi.org/10.1007/s00603-014-0687-5
He MC, Li JY, Liu DQ (2021a) A novel true triaxial apparatus for simulating strain bursts under high stress. Rock Mech Rock Eng 54(2):759–775. https://doi.org/10.1007/s00603-020-02285-y
He MC, Ren FQ, Liu DQ (2021b) Experimental study on strain burst characteristics of sandstone under true triaxial loading and double faces unloading in one direction. Rock Mech Rock Eng 54(1):149–171. https://doi.org/10.1007/s00603-020-02272-3
Hedley DGF (1992) Rockburst handbook for Ontario hardrock mines. Canmet
Hua AZ, You MQ (2001) Rock failure due to energy release during unloading and application to underground rock burst control. Tunn Undergr Space Technol Inc Trenchless Technol Res 3(16):241–246
Huang RQ, Huang D (2014) Evolution of rock cracks under unloading condition. Rock Mech Rock Eng 47(2):453–466. https://doi.org/10.1007/s00603-013-0429-0
Kidybiński A (1981) Bursting liability indices of coal. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts 18(4):295–304. https://doi.org/10.1016/0148-9062(81)91194-3. (Pergamon)
Li Z, Xu R (2021) An early-warning method for rock failure based on Hurst exponent in acoustic emission/microseismic activity monitoring. Bull Eng Geol Environ 80(10):7791–7805. https://doi.org/10.1007/s10064-021-02446-5
Li J, He M, Liu D (2023) Comparative experimental investigation on true triaxial double-side fast unloading rockburst and biaxial compression under high stress. Can Geotech J. https://doi.org/10.1139/cgj-2022-0344
Liu XL, Liu Z, Li XB, Gong FQ, Du K (2020) Experimental study on the effect of strain rate on rock acoustic emission characteristics. Int J Rock Mech Min 133:104420. https://doi.org/10.1016/j.ijrmms.2020.104420
Liu D, Ling K, Li D (2021) Evolution of anisotropy during sandstone rockburst process under double-faces unloading. J Cent South Univ 28(8):2472–2484. https://doi.org/10.1007/s11771-021-4780-0
Liu D, Sun J, He P (2023a) Experimental study on the effect of water absorption level on rockburst occurrence of sandstone. J Rock Mech Geotech. https://doi.org/10.1016/j.jrmge.2023.06.019
Liu ZX, Meng XR, Zhao GM (2023b) Energy and damage analysis of sandstone under true triaxial compression. Chin J Rock Mech Eng 42(02):327–341 (in Chinese)
Lockner D (1993) The role of acoustic emission in the study of rock fracture. Int J Rock Mech Min Sci Geomech Abstr 30(7):883–899. https://doi.org/10.1016/0148-9062(93)90041-B. (Pergamon)
Lu WB, Zhou CB, Chen M (2008) Research on transient characteristics of excavation unloading. Chin J Rock Mech Eng 27(11):2184–2192 (in Chinese)
Meng QB, Zhang MW, Han LJ (2016) Effects of acoustic emission and energy evolution of rock specimens under the uniaxial cyclic loading and unloading compression. Rock Mech Rock Eng 49(10):3873–3886. https://doi.org/10.1007/s00603-016-1077-y
Munoz H, Taheri A, Chanda EK (2016) Fracture energy-based brittleness index development and brittleness quantification by pre-peak strength parameters in rock uniaxial compression. Rock Mech Rock Eng 49:4587–4606. https://doi.org/10.1007/s00603-016-1071-4
Ortlepp WD, Stacey TR (1994) Rockburst mechanisms in tunnels and shafts. Tunn Undergr Sp Tech 9(1):59–65. https://doi.org/10.1016/0886-7798(94)90010-8
Saadat M, Taheri A (2019) A numerical approach to investigate the effects of rock texture on the damage and crack propagation of a pre-cracked granite. Comput Geotech 111:89–111. https://doi.org/10.1016/j.compgeo.2019.03.009
Shahidan S, Pulin R, Bunnori NM (2013) Damage classification in reinforced concrete beam by acoustic emission signal analysis. Constr Build Mater 45:78–86. https://doi.org/10.1016/j.conbuildmat.2013.03.095
Shannon CE (1948) A mathematical theory of communication. Bell Syst Techn J 27(3):379–423. https://doi.org/10.1145/584091.584093
Shirani FR, Shaffiee HS, Taheri A (2020) Application of self-organizing map and fuzzy c-mean techniques for rockburst clustering in deep underground projects. Neural Comput Appl 32:8545–8559. https://doi.org/10.1007/s00521-019-04353-z
Stacey TR (2016) Addressing the consequences of dynamic rock failure in underground excavations. Rock Mech Rock Eng 49(10):4091–4101. https://doi.org/10.1007/s00603-016-0922-3
Sun Y, Tan C (1995) An analysis of present-day regional tectonic stress field and crustal movement trend in China. Int J Geomech 1(3):1–12 (in Chinese)
Wang JA, Park HD (2001) Comprehensive prediction of rockburst based on analysis of strain energy in rocks. Tunn Undergr Sp Tech 16(1):49–57. https://doi.org/10.1016/S0886-7798(01)00030-X
Wang CL, He BB, Hou XL, Li JY (2020) Stress–energy mechanism for rock failure evolution based on damage mechanics in hard rock. Rock Mech Rock Eng 53(3):1021–1037. https://doi.org/10.1007/s00603-019-01953-y
Wu C, Gong F, Luo Y (2021) A new quantitative method to identify the crack damage stress of rock using AE detection parameters. Bull Eng Geol Environ 80:519–531. https://doi.org/10.1007/s10064-020-01932-6
Xie HQ, He CH (2004) Study of the unloading characteristics of a rock mass using the triaxial test and damage mechanics. Int J Rock Mech Min 41:74–80. https://doi.org/10.1016/j.ijrmms.2004.03.022
Zhang ZZ, Gao F, Shang XJ (2014) Rock burst proneness prediction by acoustic emission test during rock deformation. J Cent South Univ 21(1):373–380. https://doi.org/10.1007/s11771-014-1950-3
Zhang Zh, Ma K, Li H, Zl He (2022) Microscopic investigation of rock direct tensile failure based on statistical analysis of acoustic emission waveforms. Rock Mech Rock Eng 55(4):2445–2458. https://doi.org/10.1007/s00603-022-02788-w
Zhao XG, Wang J, Cai M (2014) Influence of unloading rate on the strainburst characteristics of Beishan granite under true-triaxial unloading conditions. Rock Mech Rock Eng 47(2):467–483. https://doi.org/10.1007/s00603-013-0443-2
Zhao K, Yu X, Zhou Y (2020) Energy evolution of brittle granite under different loading rates. Int J Rock Mech Min 132:104392. https://doi.org/10.1016/j.ijrmms.2020.104392
Zhou XP, Zhang YX, Ha QL (2008) Real-time computerized tomography (CT) experiments on limestone damage evolution during unloading. Theor Appl Fract Mec 50(1):49–56. https://doi.org/10.1016/j.tafmec.2008.04.005
Zhou ZL, Cai X, Li XB (2020) Dynamic response and energy evolution of sandstone under coupled static–dynamic compression: insights from experimental study into deep rock engineering applications. Rock Mech Rock Eng 53(3):1305–1331. https://doi.org/10.1007/s00603-019-01980-9
Zietlow WK, Labuz JF (1998) Measurement of the intrinsic process zone in rock using acoustic emission. Int J Rock Mech Min 35(3):291–299. https://doi.org/10.1016/S0148-9062(97)00323-9
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Financial support from the National Natural Science Foundation of China (No. 52074299, No. 41941018) and the Fundamental Research Funds for the Central Universities (No. 2023JCCXSB02) are gratefully acknowledged.
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Li, J., Liu, D., He, M. et al. Experimental investigation on pillar rockburst of true triaxial four-face rapid unloading under high stress. Bull Eng Geol Environ 83, 125 (2024). https://doi.org/10.1007/s10064-024-03628-7
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DOI: https://doi.org/10.1007/s10064-024-03628-7