摘要
针对北票矿区台吉井田特殊地质条件和关井后煤层气由地表泄漏的实际情况,在大量实际现场勘测的基础上,从数值分析角度,利用ANSYS有限元软件,通过简化建立三维有限元模型模拟了开采前后地应力场和位移场变化,得到开采前后煤层剖面应力场和地表沉陷等值线图等模拟结果,从开采前后应力场和位移场变化规律进行归纳分析,得出:将开采和灾害后应力释放降低区作为煤层气原生气源集聚区判断依据,将地层沉陷“三带”影响范围作为煤层气后生气源集聚区确定的根据,并给出了煤层气后生气源集聚区范围的确定方法.据此得到废弃矿区采空区为煤层气原生气源集聚位置,“三带”影响区域为煤层气后生气源集聚范围.
According to the special geology condition of Beipiao mining area and the coal bed methane leak situation after coal mines were closed, based on a large amounts of site gas survey, the three-dimensional finite element model was established using ANSYS software. The variation of stress field and displacement field was simulated. The contours charts of stress field in coal seam section and surface subsidence and so on were yielded. Some valuable conclusions were presented based on the analysis and summary about rules of stress field and displacement field before and after mining. Those are: ① regarding the stress relaxation region as the identification of the original gas source concentration region; ② regarding the three regions in strata subsidence as the identification of the secondary gas source concentration. And the scale of secondary gas source was demonstrated. The results showed that the gob is the original gas source region and the three-region scale is the secondary gas source region.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2005年第3期301-304,共4页
Journal of China Coal Society
基金
国家自然科学基金重大资助项目(50490275)
关键词
北票矿区
废弃矿井
煤层气
气体泄漏
气源集聚
Beipiao mining area
abandoned mines
coal bed methane
gas leakage
gas source concentration
