注热井周围煤体蠕变过程的渗透率变化规律模拟研究  

Simulation study on permeability variation law of coal creep process around injection well

作　　者：陆红波 吕兆兴[1,2] 冯增朝[1,2] LU Hongbo;LYU Zhaoxing;FENG Zengchao(Institute of Mining Technology,Taiyuan University of Technology,Taiyuan 030024,China;Key Laboratory of In-situ Property-Improving Mining of Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学采矿工艺研究所,山西太原030024 [2]太原理工大学原位改性采矿教育部重点实验室,山西太原030024

出　　处：《中国矿业》2020年第5期167-172,共6页China Mining Magazine

基　　金：国家自然科学基金项目资助(编号:51704204);三晋学者支持计划资助(2017)。

摘　　要：本文通过使用COMSOL软件的数值模拟方法,进行了注热煤体在蠕变过程中渗透率变化规律的研究,结合物理实验得到温度对于煤体相关力学参数的影响关系,分析了温度对于煤体蠕变及其渗透率变化的作用。认为如果煤体的温度高于阈值383K时,温度升高会使煤体骨架向外膨胀,其初始渗透率增大;煤体温度低于该阈值时,温度升高会使其初始渗透率降低。在注热20d后,注热井周围的煤体蠕变变形加剧,其渗透率受蠕变影响呈下降趋势。Through the numerical simulation method of COMSOL software,the change law of permeability of the injected coal in creep process is studied.The influence of temperature on the mechanical parameters of coal is obtained by physical experiment.The temperature is analyzed for the creep of coal and the role of changes in its permeability.It is considered that if the temperature of the coal is higher than the threshold value of 383 K,the temperature rise will cause the coal skeleton to expand outward,and the initial permeability will increase;when the coal temperature is lower than the threshold value,the temperature increase will lower the initial permeability.After 20 days of heat injection,the creep deformation of the coal around the injection well is intensified,and its permeability is declining due to creep.

关 键 词：注热 蠕变 渗透率 孔隙率 含瓦斯煤体 

分 类 号：TD712[矿业工程—矿井通风与安全]