饱和大理岩特征强度试验研究

doi:10.13722/j.cnki.jrme.2018.1302

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Abstract The uniaxial compression acoustic emission(AE) tests of dry and saturated marble were carried out to study the effect mechanism of water on crack propagation. The characteristic strength of samples was determined by AE method and volumetric strain(crack volumetric strain) method. The applicability of AE method for determining the characteristic strength was discussed，and the effect mechanism of water on the characteristic strength was analyzed combining statistical analysis results of dominant frequency of AE waveforms in the vicinity of the characteristic strength. The results show that the strength threshold of crack initiation determined by AE method is lower than that by macro volumetric strain method. AE method can be suitably used to determine the strength threshold of crack initiation for saturated rock，whereas it is not appropriate to determine the damage strength threshold. The normalized crack initiation strength of samples decreases and the normalized damage strength increases after saturation. Effect factors of water on the normalized characteristic strength are the intensity of the pore water pressure and the crack growth resistance. Near the moment of crack initiation，the effect of the pore water pressure is obvious and there are many micro-tensile failures inside the rock，which makes crack develop stably at a lower stress level. Near the moment of volume dilation，the effect of the pore water pressure is weakened along with the existence of the crack growth resistance，which makes unstable crack propagation occur at a higher stress level.

Key words： rock mechanics saturated characteristic strength volumetric strain(crack volumetric strain) acoustic emission(AE) dominant frequency

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	Articles by authors
	ZHU Jun1
	2
	DENG Jianhui1
	2
	HUANG Yiming1
	2
	YU Zhiqiu1
	2

Cite this article:

ZHU Jun1,2,DENG Jianhui1, et al. Experimental study on the characteristic strength of saturated marble#br#[J]. , 2019, 38(6): 1129-1138.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.1302 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/I6/1129

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