基于单轴压缩的岩体破坏机制细观试验研究

doi:10.13722/j.cnki.jrme.2016.0808

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Abstract The evolution of microscopic fabric of rock has an important effect on its mechanical property and failure shape and it is therefore essential to study the microscopic fabric on rock. In this study，the scanning electron microscope(SEM) was used to scan the micro structure of the failure section of samples after compression shear test and Brazil split test. The morphological characteristics of the fracture surface of specimen were highlighted and the criteria of microscopic morphology matching macroscopic mechanical properties of crack surface were established. Meanwhile，the whole failure section of manufactured pre-crack was scanned with different angles of inclination. The criteria was applied to distinguish their microscopic morphology. As a result，the ratio of tensile-shear stresses on the fracture surface was obtained. The variation of the ratio in the cracking propagation process was studied. The results show that the ratio of tensile-shear stresses is closely related to the dip angle of the pre-existing crack. When the inclination angle is less than 45°，the tensile stress on the fracture surface is high，and the ratio decreases with the crack angle increasing. When the inclination angle is more than 45°，the results are opposite to the former. When the inclination angle is 45°，there are two macroscopic cracks owing to the combined effect of tensile and shear stresses. The proportion of wing cracks tensile stress changes from high to low during crack propagation process，and the results of secondary crack are converse to the former.

Key words： rock mechanics microscopic mechanism electron microscope scanning method criteria of micro-morphology crack shapes

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	Articles by authors
	ZHAO Cheng1
	2
	YU Zhimin1
	2
	WANG Wendong1
	2
	MATSUDA Hiroshi3
	MORITA Chihiro3

Cite this article:

ZHAO Cheng1,2,YU Zhimin1, et al. Meso-experimental study of failure mechanism of rock based on uniaxial compression test[J]. , 2016, 35(12): 2490-2498.

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http://rockmech.org/EN/10.13722/j.cnki.jrme.2016.0808 OR http://rockmech.org/EN/Y2016/V35/I12/2490

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