温度对采动作用下含瓦斯原煤力学和变形的影响

以原煤为研究对象,利用“含瓦斯煤热流固耦合三轴伺服渗流实验装置”,开展温度对采动作用下含瓦斯煤力学特性的影响研究.研究表明：1）在相同初始围压、气压和温度下,与恒定围压相比,卸围压煤样屈服段缩短,峰值应力和对应的轴向应变降低,横向应变速率增大,侧向膨胀系数和变形模量的演化进程加速;2）在相同初始围压和气压下,随温度升髙,卸围压煤样强度降低,峰值应力处各应变均减小,侧向膨胀系数和变形模量均增大;3）髙温环境下,煤岩发生失稳破坏和瓦斯突出的危险性变大,对采煤工作面巷道支护和瓦斯突出防治提出了更髙的要求....

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Bibliographic Details
Published in东北大学学报（自然科学版） Vol. 38; no. 9; pp. 1347 - 1352
Main Author 廖雪娇 蒋长宝 段敏克
Format Journal Article
LanguageChinese
Published 重庆市交通规划勘察设计院,重庆 401121%重庆大学煤矿灾害动力学与控制国家重点实验室,重庆,400030%重庆大学煤矿灾害动力学与控制国家重点实验室,重庆 400030 2017
重庆大学煤矿灾害动力学与控制国家重点实验室,重庆 400030
重庆市綦江区国土资源和房屋管理局,重庆 401420
Subjects
全应力-应变
卸围压
原煤
温度
采动力学
全应力-应变
温度
unloading confining pressure
采动力学
temperature
mining-induced mechanics
complete stress-strain
卸围压
raw coal
原煤
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Summary:以原煤为研究对象,利用“含瓦斯煤热流固耦合三轴伺服渗流实验装置”,开展温度对采动作用下含瓦斯煤力学特性的影响研究.研究表明：1）在相同初始围压、气压和温度下,与恒定围压相比,卸围压煤样屈服段缩短,峰值应力和对应的轴向应变降低,横向应变速率增大,侧向膨胀系数和变形模量的演化进程加速;2）在相同初始围压和气压下,随温度升髙,卸围压煤样强度降低,峰值应力处各应变均减小,侧向膨胀系数和变形模量均增大;3）髙温环境下,煤岩发生失稳破坏和瓦斯突出的危险性变大,对采煤工作面巷道支护和瓦斯突出防治提出了更髙的要求.
Bibliography:21-1344/T
mining-induced mechanics; unloading confining pressure; complete stress- strain; temperature; raw coal
Taking raw coal as object,by using self-made “ thermal- hydro-mechanical coupled with triaxial servo-controlled seepage apparatus for containing-gas coal”,the effect of temperature on the mechanical properties of containing-gas raw coal was studied under constant confining pressure and unloading confining pressure. The results showed that： 1） Under the same initial confining pressure,gas pressure and temperature,compared with the constant confining pressure, the yield stage of the coal under unloading confining pressure is shortened. Besides,its peak stress and associated axial strain decrease, the transverse strain rate increases, and the evolution processes of its lateral expansion ratio and deformation modulus are accelerated. 2） Under the same initial confining pressure and gas pressure,with the increase of temperature,the strength of coal under unloading confining pressure decreases,the axial st
ISSN:1005-3026
DOI:10.12068/j.issn.1005-3026.2017.09.027