温度对采动作用下含瓦斯原煤力学和变形的影响

发布时间：2018-05-09 21:57

本文选题：采动力学 + 卸围压　；参考：《东北大学学报(自然科学版)》2017年09期

【摘要】：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,随温度升高,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)高温环境下,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高的要求.
[Abstract]:Taking raw coal as the research object, the influence of temperature on the mechanical properties of gas-bearing coal used in mining operation was studied by using the "gas-bearing coal heat-fluid-solid coupling three-axis servo seepage experimental device". The results show that under the same initial confining pressure, air pressure and temperature, the yield section of unloaded coal sample is shortened, the peak stress and corresponding axial strain decrease, and the transverse strain rate increases, compared with the constant confining pressure. Under the same initial confining pressure and atmospheric pressure, the strength of the unloaded coal sample decreases with the increase of temperature, and the strain at the peak stress decreases, and the evolution process of lateral expansion coefficient and deformation modulus accelerates. Both lateral expansion coefficient and deformation modulus are increased) under high temperature, the risk of coal rock instability and gas outburst becomes greater, which puts forward higher requirements for roadway support and gas outburst prevention in coal mining face.
【作者单位】：重庆大学煤矿灾害动力学与控制国家重点实验室;重庆市交通规划勘察设计院;重庆市綦江区国土资源和房屋管理局;
【基金】：国家自然科学基金资助项目(51674048,51204217) 重庆市科技计划资助项目(cstc2015jcyj A90009) 中央高校基本科研业务费专项资金重点资助项目(CDJZR14245501)
【分类号】：TD712

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