摘要
为研究煤炭深部开采区域内温度对煤体渗流以及孔裂隙结构变形的影响,应用CT三维重构技术,借助ANSYS软件对煤体微观孔裂隙结构分别进行共轭传热模拟和热变形模拟。共轭传热模拟结果显示,20℃的水经80℃的煤体壁面加热后以37.13℃流出,煤体温度沿壁面向流体中心逐渐降低,孔裂隙结构对于流动速度和温度的分布有重要的影响,沿流动方向截面连通孔隙率大,则流动速度慢,流体升温快,固体温度下降;反之,则流动速度快,流体升温变缓,固体温度回升。热变形模拟结果显示,骨架变形量与距约束面的距离成正比,约束面附近变形量小,变形方向指向孔裂隙空间,距约束面远的位置变形量大,变形方向向外发散,裂隙的存在会使变形量增加,且随温度载荷的增加,不同孔裂隙结构间的变形差异增加。
In order to investigate the influence of temperature in deep coal mining area on coal seepage and pore fracture structure deformation, 3D CT reconstruction technology and ANSYS were used to simulate the process of conjugate heat transfer and thermal deformation of coal microstructure respectively. The conjugate heat transfer simulation results show that water that was initially injected into the 80℃ coal wall at 20℃ was heated to 37.13℃ when it flows out. The temperature of the coal gradually decreases along the wall facing the fluid center. Pore fracture structure has an important influence on the velocity and the temperature of the flow along the flow direction. When the connected cross-section porosity is large, the flow speed is slow, the fluid heats up quickly, and the solid temperature decreases. On the other hand, when the connected cross section porosity is small, the flow speed is fast, the fluid temperature rises slowly, and the solid temperature rises. The thermal deformation simulation results show that the deformation is proportional to the distance from the constraint surface. When the deformation near the constraint surface is small, and the direction is pointed to the pore fracture space. While if the deformation at a place that is far away from the constraint surface is large, the deformation direction is diverging outward. Moreover, the existence of the cracks will increase the deformation, the deformation difference between the different pore or crack structures will also increases with the increasing temperature.
作者
王刚
秦相杰
江成浩
张振宇
WANG Gang;QIN Xiang-jie;JIANG Cheng-hao;ZHANG Zhen-yu(State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology,Shandong University of Science and Technology,Qingdao,Shandong 266590,China;College of Safety and Environmental Engineering,Shandong University of Science and Technology,Qingdao,Shandong 266590,China;College of Resources and Environmental Sciences,Chongqing University,Chongqing 400044,China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2020年第5期1750-1760,共11页
Rock and Soil Mechanics
基金
国家重点研发计划资助项目(No.2017YFC0805201)
国家自然科学基金资助项目(No.51674158,No.51934004,No.51974176)
山东省自然科学基金重大基础研究项目(No.ZR2018ZA0602)
泰山学者工程专项经费资助项目(No.TS20190935)。
关键词
煤
CT三维重构
共轭传热
截面连通孔隙率
热变形
coal
3D CT reconstruction
conjugate heat transfer
cross-section connected porosity
thermal deformation
