Conventional triaxial loading and unloading test and PFC numerical simulation of rock with single fracture

• Autorzy: Tang, Yin , Chen, Haijun , Xiong, Liangxiao , Xu, Zhongyuan
• Języki publikacji: EN

Abstrakty

EN

Take the metamorphic sandstone as the reference object, by making rock like samples with fractures, the conventional triaxial loading and unloading test and PFC numerical simulation of rock like sample with single fracture were conducted, and the effects of the loading path, inclined angle of fracture, axial stress level during unloading, initial confining pressure during unloading on the compressive strength, peak strain and crack propagation evolution of the samples were considered. The compressive strength of the specimen under triaxial unloading is smaller than that under triaxial loading. The peak strain of the specimen under triaxial unloading is also smaller than that under triaxial loading. The specimen is more prone to brittle failure. When the axial stress level is the same during unloading, with the increase of the initial confining pressure during unloading, the difference of the compressive strength of the specimens with different inclined angles of fracture gradually decreases. Under the condition of uniaxial compression and triaxial compression, the failure of all specimens is tensile failure, and the shear failure is the main one during unloading.

Słowa kluczowe

PL

próbka przypominająca skałę; obciążenie trójosiowe; test odciążenia; wytrzymałość na ściskanie

EN

rock like specimen; triaxial loading; unloading test; compressive strength

• Czasopismo: Archives of Civil Engineering
• Rocznik: 2024
• Tom: Vol. 70, nr 2
• Strony: 233--254
• Opis fizyczny: Bibliogr. 14 poz., il., tab.

Twórcy

autor

Tang, Yin

• Geotechnical Engineering Institute, Sichuan Institute of Building Research, Chengdu, China,

autor

Chen, Haijun

• Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing, China,

autor

Xiong, Liangxiao

• School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang, China,

autor

Xu, Zhongyuan

• Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu, China,

Bibliografia

• [1] J. Chen, D. Jiang, S. Ren, et al., “Comparison of the characteristics of rock salt exposed to loading and unloading of confining pressures”, Acta Geotechnica, vol. 11, pp. 221-230, 2016, doi: 10.1007/s11440-015-0369-9.
• [2] X. L. Guo, Z. S. Tan, X. Wang, et al., “Effect of bedding angle and mineral composition on mechanical properties and fracture behavior of phyllite under unloading confining pressures”, Geotechnical and Geological Engineering, vol. 38, pp. 3611-3621, 2020, doi: 10.1007/s10706-020-01238-0.
• [3] Y. Chen, W. B. Guo, J. P. Zuo, et al., “Effect of triaxial loading and unloading on crack propagation and damage behaviors of sandstone”, Rock Mechanics and Rock Engineering, vol. 54, pp. 6077-6090, 2021, doi: 10.1007/s00603-021-02605-w.
• [4] B. Dai, G. Zhao, H. Konietzky, et al., “Experimental and numerical study on the damage evolution behaviour of granitic rock during loading and unloading”, KSCE Journal of Civil Engineering, vol. 22, pp. 3278-3291, 2018, doi: 10.1007/s12205-018-1653-7.
• [5] B. Dai, G. Zhao, H. Konietzky, et al., “Experimental investigation on damage evolution behaviour of a granitic rock under loading and unloading”, Journal of Central South University, vol. 25, pp. 1213-1225, 2018, doi: 10.1007/s11771-018-3819-3.
• [6] Y. Chen, J. Zuo, et al., “Experimental investigation on the crack propagation behaviors of sandstone under different loading and unloading conditions”, International Journal of Rock Mechanics and Mining Sciences, vol. 130, pp. 1-10, 2020, doi: 10.1016/j.ijrmms.2020.104310.
• [7] X. Huang, Q. Liu, B. Liu, et al., “Experimental study on the dilatancy and fracturing behavior of soft rock under unloading conditions”, International Journal of Civil Engineering, vol. 15, pp. 921-948, 2017, doi: 10.1007/s40999-016-0144-9.
• [8] X. Li, H. Zhao, B. Wang, and T. Xiao, “Mechanical properties of deep-buried marble material under loading and unloading tests”, Journal of Wuhan University of Technology-Materials Science Edition, vol. 28, pp. 514-520, 2013, doi: 10.1007/s11595-013-0723-4.
• [9] X. An, Y. Sun, T. Lei, et al., “Analysis of pre-peak strain energy storage transformation mechanism of diorite under triaxial loading-unloading paths”, Bulletin of Engineering Geology and the Environment, vol. 82, no. 7, pp. 1-14, 2023, doi: 10.1007/s10064-023-03310-4.
• [10] J. Dai, J.-F. Liu, L. Ran, et al., “Acoustic emission characteristics and energy evolution of salt rock for deep-salt-cavern engineering under triaxial loading and unloading”, Journal of Central South University, vol. 30, pp. 962-974, 2023, doi: 10.1007/s11771-022-5213-4.
• [11] H. Gong, Y. Luo, K. Xu, et al., “Mechanical characteristics of failure and rockburst proneness of fractured granite from Shuangjiangkou hydropower station under triaxial loading and unloading”, Bulletin of Engineering Geology and the Environment, vol. 82, no. 7, pp. 1-19, 2023, doi: 10.1007/s10064-023-03281-6.
• [12] Q.-B. Meng, J.-F. Liu, L. Ren, et al., “Experimental study on rock strength and deformation characteristics under triaxial cyclic loading and unloading conditions”, Rock Mechanics and Rock Engineering, vol. 54, pp. 777-797, 2021, doi: 10.1007/s00603-020-02289-8.
• [13] P. Yin, S. Yang, et al., “Experiment and DEM simulation study on mechanical behaviors of shale under triaxial cyclic loading and unloading conditions”, Geomechanics and Geophysics for Geo-Energy and Geo-Resources, vol. 9, art. no. 10, 2023, doi: 10.1007/s40948-023-00554-y.
• [14] X.-B. Li, Z.-H. Chen, et al., “Unloading responses of pre-flawed rock specimens under different unloading rates”, Transactions of Nonferrous Metals Society of China, vol. 29, no. 7, pp. 1516-1526, 2019, doi: 10.1016/S1003-6326(19)65059-4.

Identyfikatory

DOI

10.24425/ace.2024.149861