基于核磁共振技术的大理岩卸荷损伤演化规律研究

doi:10.13722/j.cnki.jrme.2014.s2.016

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Abstract To study the damage characteristics of rock microstructure under unloading condition，the loading and unloading confining pressure tests on the marble specimens under different initial confining pressures and different unloading confining pressure ratios are conducted. The crosswise relaxation time T2 distribution，rock porosity and nuclear magnetic resonance imaging(MRI) are obtained by the nuclear magnetic resonance(NMR) technique. The results show that：(1) As the unloading confining pressure ratio increases，the T2 spectrum curves move towards right with the spectrum areas keeping increasing，and the porosity of the specimens increases，which indicates that the damage of specimens increases. (2) As the unloading confining pressure ratio increases，the spectral peaks of small microcracks move towards right，but the spectrum areas of small microcracks are relatively small，which indicates that the size of small microcracks increases and the number of small microcracks changes randomly. The influence of small microcracks is weak to the porosity of the specimens. There is a critical value near the unloading confining pressure ratio of 75%. When the unloading confining pressure ratio is below the critical value，new microcracks appear constantly in the specimens. When the unloading confining pressure ratio is above the critical value，the generation of new microcracks is limited. (3) As the unloading confining pressure ratio increases，the spectral peaks of big microcracks move towards right. The spectrum areas of big microcracks keep increasing and account for over 96% of all microcracks in the rock specimens，which indicates that the size and number of big microcracks increase and the change of big microcracks determines the porosity and damage of rock. (4) The development process of microcracks and fracture in the rock specimens is shown dynamically.

Key words： rock mechanics nuclear magnetic resonance(NMR) rock damage rock porosity T2 spectrum distribution unloading confining pressure ratio

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	Articles by authors
	ZHOU Keping
	HU Zhenxiang
	LI Jielin
	GAO Feng
	WANG Mingqiu

Cite this article:

ZHOU Keping,HU Zhenxiang,LI Jielin, et al. STUDY OF MARBLE DAMAGE EVOLUTION LAWS UNDER UNLOADING CONDITIONS BASED ON NUCLEAR MAGNETIC RESONANCE TECHNIQUE[J]. , 2014, 33(S2): 3523-3530.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.s2.016 OR https://rockmech.whrsm.ac.cn/EN/Y2014/V33/IS2/3523

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