Study on structural damage evolution mechanism of coal in situ environment

被引：0

作者：

Jing P. ^{[1
]}

Xie H. ^{[1
,2
,3
]}

Zhou H. ^{[1
]}

Jia W. ^{[3
]}

Xie S. ^{[1
]}

Chen B. ^{[1
]}

Lu M. ^{[1
]}

机构：

[1] School of Energy and Mining Engineering, China University of Mining and Technology-Beijing, Beijing

[2] School of Mechanics and Civil Engineering, China University of Mining and Technology-Beijing, Beijing

[3] Institute of Deep Earth Sciences and Green Energy, College of Civil and Transportation Engineering, Shenzhen University, Guangdong, Shenzhen

来源：

Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2023年 / 40卷 / 05期

关键词：

CT scan; digital coal and rock; mesoscopic damage mechanism; numerical simulation; pore structure;

D O I：

10.13545/j.cnki.jmse.2023.0286

中图分类号：

学科分类号：

摘要：

After coal resources enter deep mining, the pore structure, mechanical properties and engineering response of deep coal are significantly different from that of shallow coal due to the particularity of deep in-situ environment. In this paper, the micro-CT scanning and three-dimensional reconstruction technology are used to conduct a three-dimensional quantitative analysis of the internal mesoscopic pore structure of coal, and the effect of the different mesoscopic pore structure on the macroscopic mechanical properties and mesoscopic damage mechanism of coal under the in-situ occurrence environment are studied. Numerical simulation of uniaxial compression damage and fracture of digital coal mass with different pore structures is carried out by digital core-numerical simulation. The results show that: the three parameters of porosity, fractal dimension and pore equivalent diameter can be used to characterize the 3D pore structure; When digitized coal is compressed, the internal tensile damage lags behind the compression damage, and the meso-pore structure has a great influence on the mechanical properties and brittle-ductility of digitized coal; The elastic modulus and peak strength of digital coal decrease with the increase of porosity and fractal dimension. The pore structure reduces the “damage stress threshold” of the digital coal body. When the fractal dimension is large, the probability of cracks occurring through the whole body increases, and the damage volume proportion of the digital coal body is reduced. © 2023 China University of Mining and Technology. All rights reserved.

引用

页码：894 / 904

页数：10

共 22 条

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