摘要
在多年冻土区进行煤矿地下开采,通风作用改变了井筒围岩的热平衡条件,从而引起了多年冻土上限及其井筒周围冻土季节融化层的变化,有可能影响到井筒支护结构的稳定性.因此,研究在矿井通风作用下,多年冻土温度场分布及随季节的变化趋势是有意义的.基于ANSYS有限元分析软件,针对多年冻土区某煤矿的赋存条件、试验采场位置以及通风作用对冻土的影响范围,建立了二维数值计算模型,利用焓式有限元方法对多年冻土井筒围岩的温度特性进行了数值模拟,分析了矿井通风对多年冻土井筒围岩的热影响程度,其计算方法和结果为下一步多年冻土煤矿地下开采井筒支护设计提供参考依据.
Mining in permafrost regions with ventilation will change the heat balance of the surrounding rock of shaft,the upper limit of permafrost and the seasonal-thawing depth of permafrost around the shaft.The stability of shaft lining structure will be affected by the heat balance change.So it is necessary to study the permafrost temperature field changing with mining ventilation.Based on finite element analysis software ANSYS,a two-dimensional calculation model has been established in terms of mining conditions,position of test stope as well as mining ventilation effect range of a coalfield located in permafrost region.The temperature characteristics of the surrounding rock of shaft in permafrost have been numerically analyzed using the enthalpy-based finite element method,The thermal effect of mining ventilation on the surrounding rock is analyzed.The calculation methods and results are valuable for the following shaft support design of underground mining in permafrost regions.
出处
《冰川冻土》
CSCD
北大核心
2013年第1期186-192,共7页
Journal of Glaciology and Geocryology
基金
国家自然科学基金创新群体(40821001)资助
关键词
矿井通风
数值模拟
井筒围岩
热影响
mining ventilation
numerical simulation
surrounding rock of shaft
thermal influence
