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  

Modify and Experiment Study on Dynamic Evolution Model for Permeability of Gas-Filled Coal Under Temprature

作　　者：孙光中[1,2,3] 荆永滨[1,3] 田坤云[1,3] 王李管[2] 张瑞林[1,3] 

机构地区：[1]河南工程学院安全工程学院,河南郑州451191 [2]中南大学资源与安全工程学院,湖南长沙410083 [3]河南省煤矿安全重点实验室培养基地,河南郑州451191

出　　处：《应用基础与工程科学学报》2017年第3期489-499,共11页Journal of Basic Science and Engineering

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)

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.Influence factors of gas-filled coal permeability was analysized and the formula for effective stress was obtained based on temprature, gas stress and gas absorption expansion. According to the interaction of three factors and Clapeyron equation, temprature increment causes gas stress variation, then causes coal matrix compression and absorption expansion stress variation. Thus, formla for effective stress was improved. The dynamic evolution model under compression and before coal peak value was modified by Kozeny-Carman equation for permeability considering interaction of temprature, gas stress and absorption expansion. Permeability for gas-filled coal under temprature was tested through self made experiment system. Gas-filled coal permeability under temprature variation was in accord with negative exponential distribution and found it had a high coherence with expiriment data compared with caculated data of modified model. Research results provide theoretical basis for multi-field coupling problem of gas-filled coal seepage under temperature.

关 键 词：温度 含瓦斯煤 渗透率模型 有效应力 

分 类 号：TD324[矿业工程—矿井建设]