砂岩加载过程中的细观损伤试验研究

doi:10.13722/j.cnki.jrme.2018.1087

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Abstract To study the meso-damage characteristics of sedimentary rocks，compression tests were carried out on sandstones under specific high confining pressures using the triaxial compression equipment. Scanning electron microscopy and energy spectrum analyzer were used to investigate micro behaviours of samples after compression，and the image-processing technique was adopted to analyze the meso-damage information of sandstones. The results indicate that，in the case of 30 MPa of the confining pressure，the stress-strain curves exhibit no evident yielding，and the plastic deformation and the meso-damage factor continue to increase and the sandstone strength gradually deteriorates with increasing the axial stress prior to exceeding the uniaxial compressive strength. The meso-damage factor obeys the Gauss function distribution，and the meso-damage gradually propagates from the edge of the surface to the center with increasing the axial stress. The three meso-structures within sandstone samples mainly exhibit as two forms of meso-morphology，e.g. sand and cement，and the damage of the sample begins from the cement and then transfers to the sand. Three components of sandstone including oxygen，silicon and aluminum respectively distribute throughout the sample，in the high-strength area and in the low-strength area.

Key words： rock mechanics plastic deformation meso-damage damage factor micro-crack elemental analysis

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	Articles by authors
	TANG Hai
	YI Shuai
	YUAN Chao
	WANG Jianlong
	DING Ansong
	ZHAO Zhiwei

Cite this article:

TANG Hai,YI Shuai,YUAN Chao, et al. Experimental study on meso-damage of sandstone during loading process#br#[J]. , 2019, 38(3): 487-498.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2018.1087 OR http://www.rockmech.org/EN/Y2019/V38/I3/487

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