基于温度作用下含瓦斯煤渗透率动态演化模型的修正及试验研究

发布时间：2018-11-01 17:43

【摘要】：对含瓦斯煤渗透率影响因素进行分析,得到了基于温度、瓦斯压力、瓦斯吸附膨胀的有效应力计算公式.从渗透率影响因素之间的相互作用出发,通过克拉伯龙方程给出了温度增量引起瓦斯压力变化,瓦斯压力导致煤基质压缩及吸附膨胀应力改变,由此改进了有效应力计算公式.以Kozeny-Carman方程为桥梁,修正了煤体峰值前,压缩条件下考虑温度、瓦斯压力及吸附膨胀相互作用影响的渗透率动态演化模型.利用自制实验系统对温度作用下含瓦斯煤渗透性进行测试,得到含瓦斯煤渗透率与温度变化符合负指数函数分布,对比修正后的模型计算数据发现其与试验数据有很好的一致性.研究成果为温度作用下含瓦斯煤渗流的多场耦合问题提供一定的理论基础.
[Abstract]:The effective stress formula based on temperature, gas pressure and gas adsorption expansion is obtained by analyzing the factors affecting permeability of gas-bearing coal. Based on the interaction between the factors affecting permeability, the change of gas pressure caused by temperature increment and the change of coal matrix compression and adsorption expansion stress are given through the Clabelon equation, and the effective stress calculation formula is improved. Taking Kozeny-Carman equation as bridge, the dynamic evolution model of permeability is modified under the influence of temperature, gas pressure and adsorption expansion interaction before the peak value of coal body and under compression condition. The permeability of gas-bearing coal under the action of temperature is tested by self-made experimental system, and the distribution of negative exponential function between permeability and temperature of gas-bearing coal is obtained. Compared with the modified model data, it is found that the model is in good agreement with the experimental data. The research results provide a theoretical basis for the multi-field coupling problem of gas-bearing coal seepage under the action of temperature.
【作者单位】：河南工程学院安全工程学院;中南大学资源与安全工程学院;河南省煤矿安全重点实验室培养基地;
【基金】：河南省高等学校重点科研项目(17A440002) 国家自然科学基金项目(51174082,51604091) 河南省重点科技攻关资助项目(132102210485) 河南省科技开放合作项目(172106000073)
【分类号】：TD712

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