基于连续变温变件的含瓦斯煤渗流特性数值模拟  

Numerical Simulation on Permeability Properties of Coal Containing Gas Based on Continuously Variable Temperature Conditions

作　　者：王公忠[1] 徐星[1] 

机构地区：[1]河南工程学院安全工程学院,河南郑州451191

出　　处：《煤矿安全》2016年第8期1-4,共4页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(51174082);河南省重点科技攻关资助项目(132102210485)

摘　　要：针对含瓦斯煤渗透率与温度变化关系,基于物理实验和数值模拟对比研究了温度变化对煤样瓦斯渗流的影响,通过对煤样的瓦斯渗流特性的深入的分析,得到以下结论：通过应力场-温度场-渗透率的实验研究,煤样渗透率随温度升高而下降,其变化曲线呈＂S＂型曲线;煤样渗透率随温度变化曲线可分为5个阶段,分别为缓慢下降阶段、加速下降阶段、减速下降阶段、二次加速下降阶段、平缓阶段;温度T=25～80℃的范围内,煤样渗透率随温度变化的幅度是随着轴压围压的增大而升高的;利用数值模型可以很好的对热力耦合情况下的煤岩的渗流特性进行计算模拟,其数值模拟结果与物理实验结果的吻合度较高。For variable relationship of coal containing gas permeability and temperature,we comparably research the influence of temperature change on coal gas seepage based on physical experiments and numerical simulation,through the in-depth analysis of gas flow characteristics of coal samples,we get the following conclusions that by the experimental study of stress field-temperature field-permeability,coal permeability decreases with the increasing temperature,the change curve was ＂ S＂ type curve; coal sample permeability changing with temperature curve can be divided into five stages,the slow decline stage,the accelerating decline stage,letting down stage,the secondary accelerating decline stage,flat stage; the temperature T is between 25 ℃ and 80 ℃,coal permeability changes with temperature amplitude with increasing axial pressure and confining pressure increased; the numerical model can be good for seepage characteristics of coal thermal coupling that is calculated in the case of simulation,and the numerical simulation results are in good agreement with the experimental results.

关 键 词：含瓦斯煤 渗透率 温度 渗流特性 数值模拟 

分 类 号：TD712[矿业工程—矿井通风与安全]