温度冲击下煤样渗透率的围压敏感性试验研究

发布时间：2018-11-11 11:10

【摘要】：通过试验研究了温度冲击前后煤样在围压加、卸载条件下的渗透率变化。对试验结果进行非线性拟合,得出煤样的渗透率与围压之间存在负指数关系。温度冲击影响着煤样渗透率对围压的敏感性。煤样经过冷冲击和热冷冲击处理后,煤样的最大渗透率损害率增幅分别为2.88%和10.64%,渗透率损害率增幅分别为18.35%和21.60%;即热冷冲击对煤样应力敏感性影响更大,热冷冲击对煤样渗透率的伤害大于冷冲击对煤样渗透率的伤害。在卸载过程中,渗透率的恢复存在明显的应力滞后效应,产生了塑性变形,由加载过程造成的渗透率伤害不能完全消除。冷冲击和热冷冲击都一定程度上加强了煤样渗透率的滞后效应,热冷冲击的滞后效果大于冷冲击。
[Abstract]:The permeability changes of coal samples under confining pressure loading and unloading conditions before and after temperature impact were studied. A negative exponential relationship between the permeability and confining pressure of coal samples was obtained by nonlinear fitting of the test results. Temperature shock affects the sensitivity of coal sample permeability to confining pressure. The maximum permeability damage rate of coal sample is increased by 2.88% and 10.64 after cold impact and hot cold impact treatment, and the increase of permeability damage rate is 18.35% and 21.60% respectively. That is, the impact of thermal impact on the stress sensitivity of coal samples is greater, and the damage of thermal impact on coal permeability is greater than that of cold impact on coal sample permeability. In the unloading process, the permeability recovery has obvious stress lag effect, resulting in plastic deformation, the permeability damage caused by the loading process can not be completely eliminated. The hysteresis effect of coal sample permeability is strengthened to some extent by cold shock and hot cold impact, and the hysteresis effect of hot cold impact is greater than that of cold shock.
【作者单位】：河南理工大学河南省瓦斯地质与瓦斯治理重点实验室-省部共建国家重点实验室培育基地安全科学与工程学院;河南理工大学煤炭安全生产河南省协同创新中心;
【基金】：国家自然科学基金(51574112,51304072) 河南省基础与前沿技术研究计划(142300413233) 教育部科学技术研究重点项目(213022A);教育部创新团队发展支持计划(IRT_16R22) 煤矿灾害动力学与控制国家重点实验室访问学者基金(2011DA105287-FW201606) 南方煤矿瓦斯与顶板灾害预防控制安全生产重点实验室开放基金(E21726) 河南省高校重点科研项目资助计划(18A620001)资助
【分类号】：TD712

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