摘要
为研究倾斜煤层煤柱覆岩结构及应力分布规律,采用理论分析、数值模拟、现场实测的方法,分析了倾斜煤层采场倾向岩体运移特征及煤层倾角与煤柱应力之间的关系。结果表明:倾斜煤层煤柱边缘直接顶岩层几乎不冒落,破断后有序排列形成小结构模型,其稳定性差,且失稳破坏为基本顶运动提供了空间,促使基本顶大结构模型的形成,大结构模型形成滞后于小结构模型,且与小结构模型存在空间上的差异;区段煤柱垂直应力集中程度随煤层倾角的增大而减小,水平应力集中程度则随煤层倾角的增大而增大;应力峰值与煤壁距离以及支承压力影响范围均随着煤层倾角的增大而减小。
In order to study overburden strata structure and the stress distribution law of the coal pillar in inclined seam,a theoretical analysis,numerical simulation and the site measuring method were applied to analyze the inclined strata movement features of the mining face in inclined seam and the relationship between the seam inclination angle and the coal pillar stress.The results showed that the immediate roof strata at the edge of the inclined seam pillar were not falling all mostly.When the roof strata broken,small structure model would be formed in a series arrangement,the stability was poor and the stability lost failure would provide the spaces for the main roof movement.Thus large structure model of the main roof was formed and the formation of the large structure model was lagging behind the small structure model. There was a difference between the large structure model and the small structure model in the space.The vertical stress concentrated degree of the sectional coal pillar would be reduced with the seam inclination angle increased and the horizontal stress concentration degree would be increased with the seam inclination increased.A distance of stress peak to the coal wall and the support pressure influence scope would be reduced with the inclination angle increased.
出处
《煤炭科学技术》
CAS
北大核心
2014年第5期21-24,共4页
Coal Science and Technology
基金
国家自然科学基金资助项目(41204035
51074065
51004043)
河南省重点科技攻关计划资助项目(122102310036)
关键词
倾斜煤层
区段煤柱
覆岩运动特征
支承压力
inclined seam
sectional coal pillar
overburden strata movement features
support pressure
