摘要
为对大柳塔煤矿21306工作面过上覆T形交叉煤柱矿压显现规律进行分析,运用理论分析和FLAC3D数值模拟,从煤柱内应力分布角度对T形煤柱的作用机理进行了分析。结果表明,上覆走向煤柱区下的工作面来压呈现对称性分布,且支架载荷普遍大于采空区下对应支架;上覆倾向煤柱区下的工作面推进过程中,分别在进入倾向煤柱、煤柱正下方以及出倾向煤柱呈现出3阶段不同的来压特征。上覆倾向煤柱对采场矿压影响明显大于走向煤柱,因走向煤柱与倾向煤柱的影响作用叠加,T形煤柱交叉区对工作面来压的影响程度则介于两者之间。煤柱上的集中应力分布是造成走向煤柱区以及进入倾向煤柱阶段采场矿压显现规律不同于其他区域的原因,而对于出倾向煤柱阶段工作面的动载矿压则是由于煤柱上方不稳定的关键块体结构的相对旋转运动造成的。
In order to analyze the strata behavior law of No.21306 coal mining face passing through upper seam T crossing coal pillar in Daliuta Coal Mine,the theoretical analysis and the FLAC3Dnumerical simulation was applied to analyze the function mechanism of the T crossing coal pillar from the point of the inner stress distribution of the coal pillar.The results showed that the strata behavior of the mining face under the upper strike coal pillar would be in a symmetry distribution,and the support loading in the mining face would be generally higher than that under the upper goaf.During the mining face passing through the upper inclined coal pillars,there would be three stage different strata behavior features respectively under and out of the upper inclined coal pillars and right under the coal pillars.The upper inclined coal pillar influenced to the strata behavior in the coal mining face would be obviously larger than that of the strike coal pillar.Due to the stack influence role of the strike pillar and inclined coal pillar,the effect degree of the cross section of the T type coal pillar to the coal mining face pressurized would be between the strata behaviors.The concentrated stress distribution on the coal pillar would be the reason to cause the stratum behaviors law of the coal mining face under the up strike coal pillar and in under inclined coal pillar stage different in other area.The dynamic stratum pressure of the coal mining face out under the inclined coal pillar stage was caused by the relative rotary movement of the unstable key block structure above the coal pillar.
出处
《煤炭科学技术》
CAS
北大核心
2010年第10期5-8,共4页
Coal Science and Technology
基金
国家重点基础研究发展计划(973计划)资助项目(3007CB209400)
教育部博士点基金资助项目(20070290513)
国家自然科学基金资助项目(50974116)
关键词
T形交叉煤柱
矿压规律
集中应力
关键层
T crossing coal pillar
strata behavior law
concentrated stress
key stratum
