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|本期目录/Table of Contents|

不同应力差条件下超临界CO2气爆煤岩体气楔作用次生裂纹扩展规律研究

《应用力学学报》[ISSN:1000-4939/CN:61-1112/O3]

期数:
2019年02期
页码:
466-472
栏目:
出版日期:
2018-12-18

文章信息/Info

Title:
Research on the law of secondary cracks propagation in coal and rock caused by gas wedging during supercritical CO2 explosion under different stress differences
作者:
孙可明王金彧辛利伟
辽宁工程技术大学 力学与工程学院 123000 阜新
Author(s):
Sun Keming Wang Jinyu Xin Liwei
School of Mechanics and Engineering, Liaoning Technical University, 123000, Fuxin, China
关键词:
超临界CO2气爆煤岩体气楔作用次生裂纹
分类号:
TP028.8
DOI:
10.11776/cjam.36.02.B130
文献标识码:
A
摘要:
为研究超临界CO2气爆技术应用于低渗煤岩增透抽采瓦斯和气爆采掘煤岩过程中,爆生气体楔入爆孔周围破裂区产生次生裂缝的规律,利用自主研发的超临界CO2气爆装置对不同应力差条件下边长为0.4m的立方体煤岩试件进行了气爆致裂实验,得到了气爆冲击荷载作用时不同应力差条件下试件各监测点应变和爆生气体压力时程曲线及爆后试件的分区破裂特征。近孔煤岩破坏由应力波引起,气楔作用产生的拉应力导致远孔次生裂纹扩展,依据实验规律建立了超临界CO2气爆煤岩体应力波和气楔作用复合破坏机制的力学模型,数值模拟分析了不同应力差条件下爆生气体气楔致裂规律。结果表明:当水平和垂直方向初应力不等时,爆生气体气楔作用使次生裂纹向垂直最小初应力方向偏转;当初应力相等时,次生裂纹沿原方向扩展,随着初应力增加,裂隙扩展长度和张开度减小;数值模拟得到的气体压力时程曲线、试件破坏特征与实验测得的气爆冲击压力时程曲线、试件破坏特征一致;基于爆生气体劈裂模型的数值模拟结果与实验结果吻合。

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