层状复合岩体损伤演化规律及分形特征

doi:10.13722/j.cnki.jrme.2016.1397

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Abstract

Shale and limestone in situ are processed indoors into 6 different combinations of bedded composite rock，through which the author explores the damage and fracture process under uniaxial compression as well as its acoustic emission characteristics. Acoustic emission system is adopted to collect the acoustic emission signal released by the test specimen during the experiment. CT scanning is performed on the composite rock before and after the experiment. The development of the internal cracks before and after the fracture is analyzed，and the fractal theory is adopted to analyze the damage of fracturing specimen through its CT images of different parts. The results show that：(1) The damage of bedded composite rock is a coupling failure process of shale component material and limestone component material under load. In the process of damaging，limestone has a restriction on shale transverse deformation，while shale has a promoting effect on limestone. The strength of shale component material is greater than that of single shale，which also goes for limestone component material. (2) According to the different combinations，the failure mode of bedded composite rock can be divided into 3 kinds：tension splitting failure，shear slip-type failure and splitting shear compound damage. Combinations of rock play a decisive role in its stress and affect the failure mode. (3) The average number of CT-scanning composite rock and the box dimension of its fracture section is able to respectively reflect the damage of the rock，that is to say，the greater the CT number difference before and after the damage of the section is，the greater the box dimension of the section is，and the more serious the damage is.

Key words： rock mechanics layered composite rock mass uniaxial compression CT scanning damage evolution fractal feature

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	Articles by authors
	TENG Junyang1
	2
	TANG Jianxin1
	2
	WANG Jinbo1
	2
	ZHANG Yuning1
	2

Cite this article:

TENG Junyang1,2,TANG Jianxin1, et al. The evolution law of the damage of bedded composite rock and its fractal characteristics[J]. , 2018, 37(S1): 3263-3278.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2016.1397 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/IS1/3263

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