陕西煤炭2024，Vol.43Issue(6)：28-33,69,7.DOI:10.20120/j.cnki.issn.1671-749x.2024.0606
瓦斯抽采钻孔孔周煤岩体损伤破坏试验
Experiment on damage of coal and rock mass around gas extraction boreholes
焦稳锋 1董亚楠 1易辉1
作者信息
- 1. 陕西陕煤黄陵矿业有限公司一号煤矿,陕西延安 727307
- 折叠
摘要
Abstract
In order to study the creep instability characteristics of gas extraction boreholes,we use a digital speckle system to observe the damage and creep process of coal and rock cracks around the borehole during the expansion process,and obtain the damage evolution and creep mechanical characteristics of coal and rock mass around the borehole.The damage of coal samples is divided into slow,intermittent and instantaneous damage types.The cracks produced by the damage and failure of three types of coal samples are mainly caused by the strain along the x direction.Among them,the cumulative increase of damage at different development stages leads to different degrees of fracture development,and finally forms different damage types on the surface of coal samples.Under the constant load stress,with the creep time,the deformation capacity and de-formation space of the coal and rock mass are gradually weakened,which reflects the relationship between the compressive and deformation resistance of the coal and rock mass around the hole and the creep time.关键词
瓦斯抽采/孔周煤岩体/损伤破坏/蠕变特征/裂隙演化Key words
gas extraction/coal rock mass around borehole/damage and destruction/creep characteristics/fracture evolution分类
矿业与冶金引用本文复制引用
焦稳锋,董亚楠,易辉..瓦斯抽采钻孔孔周煤岩体损伤破坏试验[J].陕西煤炭,2024,43(6):28-33,69,7.
