循环加卸载下节理砂岩宏细观损伤破坏机制研究

doi:10.13722/j.cnki.jrme.2022.0816

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Abstract To study the macro and micro mechanical characteristics and failure mechanism of cumulative damage of jointed rock mass under fatigue loading，cyclic loading and unloading tests of jointed sandstone with different upper stress ratios were carried out. The experimental results show that：(1) With the increase of the upper limit stress ratio，the hysteretic cycle spacing of jointed sandstone changes from two-phase sparse-dense to three-phase sparse-dense-sparse. (2) When the upper limit stress ratio is less than 0.90，the uniaxial compressive strength of jointed sandstone increases to different degrees after cyclic loading and unloading，and the value increases first and then decreases with the increase of the upper limit stress ratio. When the upper limit stress ratio is 0.80，the uniaxial compressive strength reaches the maximum. When the upper limit stress ratio is greater than or equal to 0.90，the failure of jointed sandstone occurs during the cycle，and the fatigue times decrease with the rise of the upper limit stress ratio. (3) The fatigue times of sandstone with different inclination angles follow the principle of 90°＞60°＞0°＞45°. Through comparative analysis of failure modes of jointed sandstone after cyclic loading and unloading，the main effect of different upper limit stress ratios mainly affect is the failure degree of samples，the higher the upper limit stress ratio，the greater the degree of fracture，while the primary effect of joint dip angle mainly affects the failure mode of the samples. The shear failure is the main failure mode of the 60°and 45°jointed sandstone samples，with the tensile failure of the 90° and 0° jointed sandstone samples as the main failure mode. (4) After using nuclear magnetic resonance(NMR) and scanning electron microscope(SEM) to test cycle and unloading joint sandstone porosity change after fatigue damage and mesoscopic structure characteristic，it is found the sample fatigue damage can be divided into three stages，slow fatigue-stability-accelerated fatigue，characterized by gap pressure filling-crushing-matrix mineral crushing clay minerals content.

Key words： rock mechanics jointed sandstone cyclic loading and unloading macroscopic parameter microstructure fatigue damage

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	Articles by authors
	WANG Ruihong1
	2
	WEI Can2
	LIU Jie1
	2
	LI Zhao2
	TAN Yihong2

Cite this article:

WANG Ruihong1,2,WEI Can2, et al. Macro and micro characteristics of jointed sandstone under cyclic loading and unloading[J]. , 2023, 42(4): 810-820.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0816 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/I4/810

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