含瓦斯构造煤卸围压作用渗透性变化特征试验研究

发布时间：2017-12-31 03:28

本文关键词：含瓦斯构造煤卸围压作用渗透性变化特征试验研究　出处：《中国安全生产科学技术》2016年07期 　论文类型：期刊论文

【摘要】：针对含瓦斯煤轴压恒定卸围压渗透性演化规律,以新登煤业二1煤原煤样为研究对象,利用自主研发的含瓦斯煤岩三轴应力蠕变渗流试验装置,开展不同围压下轴向应力恒定卸围压渗流测试试验。基于实验结果表明:构造煤在应力加载阶段渗透率降低,且轴压围压同时加载,渗透率变化与轴向应变符合线性变化,轴压加载阶段,渗透率与轴向应变符合负指数函数变化规律;围压卸载阶段,渗透率在卸围压过程中一直减小,随着轴向应变的增加,渗透率出现反弹,但未出现突变现象,渗透率增加阶段与时间变化符合退化的负指数函数关系;构造煤渗透率卸围压失稳后,渗透率没有出现突变原因认为煤样中没有形成较大的有效渗流通道,且在一定的有效应力作用下瓦斯渗流的有效通道出现自愈合现象。
[Abstract]:Aiming at the evolution rule of constant axial pressure unloading confining pressure permeability of gas-bearing coal, taking the raw coal sample of Xindeng coal industry as the research object, the self-developed triaxial stress creep seepage test device of gas-bearing coal and rock is used. The experimental results show that the permeability of tectonic coal decreases at the stress loading stage and the axial confining pressure is loaded at the same time. The change of permeability accords with the linear change of axial strain. In the stage of axial compression loading, the change of permeability and axial strain accords with the law of negative exponential function. At the stage of confining pressure unloading, the permeability decreases all the time in the process of unloading confining pressure. With the increase of axial strain, the permeability rebounds, but there is no sudden change. The phase of permeability increase and the change of time accord with the degenerate negative exponential function. The reason that the permeability of structural coal is unstable after unloading confining pressure is that there is no effective seepage channel formed in the coal sample. And under certain effective stress, the effective passage of gas seepage appears self-healing phenomenon.
【作者单位】：河南工程学院安全工程学院;河南省煤矿安全重点实验室培养基地;
【基金】：国家自然科学基金项目(51174082) 河南省重点科技攻关项目(132102210485) 河南省高等学校重点科研项目(17A440002)
【分类号】：TD712
【正文快照】： 0引言煤岩体受采动影响,从力学本质上来说主要是煤岩体的加载与卸载行为。目前,加载力学的研究相对成熟,卸荷力学的研究也慢慢成为研究的热点,而在煤矿开采过程中,卸荷现象是非常普遍的,卸荷后煤岩体失稳瓦斯渗流特性的研究对于认识瓦斯灾害有一定的实际意义。在煤岩体卸荷渗

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