不同含水率煤体单轴压缩力学特性及损伤统计模型研究

doi:10.13722/j.cnki.jrme.2017.1080

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Abstract In order to study the influence of moisture on the mechanical properties of coal，raw coal and briquette coal samples with different moisture contents were prepared，and the uniaxial compression tests were carried out. Based on the test results，the deformation characteristics of two types of coal samples with various moisture contents were discussed，the relationship between the mechanical parameters and moisture contents of coal samples were analyzed and the failure modes of two coal samples with different moisture contents were compared. The results show that，as the moisture content increases，the width of the compaction phase in the stress-strain curve increases，the width of the elastic phase decreases and the yield phase becomes more visible. The fitting relationships between the moisture content and mechanical parameters of two types of coal samples are the same. The moisture content and the compressive strength have a negative linear relationship，the peak strain and the moisture content have a positive linear relationship，and the elastic modulus and the moisture content have a negative exponential relationship. From the dry state to the saturated water state，the raw coal samples show shear failure and combined tensile-shear failure in turn，while the briquette samples show shear failure，tensile failure and combined tensile-shear failure. The segmented constitutive model of coal mass damage considering moisture content and the stress-strain relationship in the compaction stage of coal was established. The fitting results show that the theoretical curve is consistent with the experimental data.

Key words： rock mechanics raw coal sample briquette coal sample moisture content uniaxial mechanical compression test constitutive model

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	WANG Kai1
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	JIANG Yifeng1
	2
	XU Chao1
	2

Cite this article:

WANG Kai1,2,JIANG Yifeng1, et al. Mechanical properties and statistical damage model of coal with different moisture contents under uniaxial compression[J]. , 2018, 37(5): 1070-1079.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2017.1080 OR http://www.rockmech.org/EN/Y2018/V37/I5/1070

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