Research on rock permeability and failure characteristics under different loading and unloading paths

• Autorzy: Zhang Fengda

Identyfikatory

DOI

10.1007/s11600-022-00788-6

• Języki publikacji: EN

Abstrakty

EN

The mined-out stress recovery under the effect of overlying strata subsidence has an influence on the mining-induced stress field and the permeability of rock mass. The TAW-3000 electro-hydraulic servo rock triaxial testing machine is used to investigate the permeability, deformation and failure characteristics of rock under different unloading–reloading paths. The unloading and reloading stress states of the rock are, respectively, analyzed in the process of stable crack growth phase, unstable crack growth phase and post-peaking phase. The results show that the local weak surface is formed, and permeability of the rock sample has little impact during the loading–unloading process, when the rock sample is loaded to the stable crack growth phase. When the rock sample is loaded to peak strength, the rock sample presents an ‘octagonal’ failure. When the rock sample is loaded to the unstable crack growth phase, the non-transfixing crack is formed. The crack is applied by the effect of loading–unloading, which produces fine and uniform particles and generates a certain amount of argillaceous composition. The impermeability of rock sample is improved. When the rock sample is loaded to peak strength, the rock sample presents a ‘Y-form’ failure. When the rock sample is loaded to the post-peaking phase, the transfixing and incomplete recovery crack is formed. When the rock sample is loaded to peak strength, the rock sample presents a ‘ladder-form’ failure. The permeability resistance is further weakened. The permeability of rock sample at residual strength of three stages is: unstable crack growth phase.

Słowa kluczowe

EN

permeability coefficient; volumetric strain; load-unload; unload-reload; stable crack growth phase; unstable crack growth phase; post-peaking phase

PL

współczynnik przepuszczalności; odkształcenie objętościowe

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2022
• Tom: Vol. 70, no 3
• Strony: 1363--1371
• Opis fizyczny: Bibliogr. 19 poz.

Twórcy

autor

Zhang Fengda

• Coal Mining and Designing Department, Tiandi Science and Technology Co., Ltd, Beijing 100013, China
• Coal Mining and Designing Branch, China Coal Research Institute, Beijing 100013, China

Bibliografia

• 1. Baghbanan A, Jing L (2008) Stress effects on permeability in a fractured rock mass with correlated fracture length and aperture. Int J Rock Mech Min Sci. 45(8):1320–1334
• 2. Chen L, Liu JF, Wang CP, Wang XY, Su R, Wang K, Shao JF (2013) Elastoplastic damage model of Beishan deep granite. Chin J Solid Mech. 32(2):289–298
• 3. Guo BH, Cheng T, Wang L, Lu T, Yang XY (2018) Physical simulation of water inrush through the mine floor from a confined aquifer. Min Water Environ 37(3):577–585
• 4. Han F, Ji HG, Zhang W (2007) Relationship between the acoustic characteristics and damage variable in the process of uniaxial loading and unloading. J Univ Sci Technol Beijing. 29(5):452–455
• 5. Hashiba K, Fukui K (2015) Effect of water on the deformation and failure of rock in uniaxial tension. Rock Mech Rock Eng 48(5):1751–1761
• 6. Li CB, Xie HP, Xie LZ (2017) Experimental and theoretical study on the shale crack initiation stress and crack damage stress. J China Coal Soc 42(4):969–976
• 7. Li JZ, Xie GX, Wang L, Li Y (2017) Mechanical mechanism of dynamic fracture evolution of coal floor unloading in deep mining. J Min Saf Eng 34(5):876–883
• 8. Li CY, Zhang Y, Peng S, Gao SY, Zhong MY (2018) Strong disturbance hazard analysis of unloading damage for floor rock mass in deep coal mining. Rock Soil Mech. 39(11):3957–3968
• 9. Li CY, Zhang Y, Zuo JP, Tang SJ, Liu SF (2019) Floor failure mechanical behavior and partition characteristics under the disturbance of voussoir beam instability in deep coal mining. J China Coal Soc 44(5):1508–1520
• 10. Liu SL, Li WP, Wang QQ, Wu ZY (2018) Numerical simulation on crack propagation of rock mass with a single crack under seepage water pressure. Adv Mech Eng 9(10):1–12
• 11. Liu JJ, Gao JL, Zhang XB, Jia GN, Wang D (2019) Experimental study of the seepage characteristics of loaded coal under true triaxial conditions. Rock Mech Rock Eng 52(8):2815–2833
• 12. Wang Y, Li X, Wu YF, Ben YX, Li SD, He JM, Zhang B (2014) Research on relationship between crack initiation stress level and brittleness indices for brittle rock. Chin J Solid Mech 33(2):264–275
• 13. Yang XB, Han XX, Liu EL, Zhang ZP, Wang TJ, Zhang LH (2018) Properties of non-uniform deformation evolution of rock under uniaxial cyclic loading and unloading. J China Coal Soc 43(2):449–456
• 14. Zhang FD, Shen BH (2019) Failure characteristics analysis of deep coal seam floor. J Min Saf Eng 31(1):44–50
• 15. Zhang LM, Wang ZQ, Sun H, Zhang YH, Kuang SY (2009) Failure characteristics and constitutive model of rock under unloading condition. J China Coal Soc 34(12):1626–1631
• 16. Zhang FD, Shen BH, Kang YH (2016) Water inrush failure mechanism of mining floor under unloading effect. Rock Soil Mech 37(2):431–438
• 17. Zhou XP, Ha QL, Zhang YX, Wang JH, Zhu KS (2005) Analysis of localization of deformation and complete stress-strain relation for mesoscopic heterogenous brittle rock materials when axial stress is held constant while lateral confinement is reduced. Chin J Solid Mech 24(18):3236–3245
• 18. Zhou H, Meng FZ, Lu JJ, Yang FJ (2014) Discussion on methods for calculating crack initiation strength and crack damage strength for hard rock. Rock Soil Mech 35(4):913–918
• 19. Zhu ZD, Zhang AJ, Xu WY (2002) Experimental research on complete stress-strain process seepage charactenstics of brittle rock. Rock Soil Mech 23(5):555–558, 563

Uwagi

PL

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).