特厚煤层综放工作面区段煤柱合理宽度研究

Study on Rational Width of Sectional Coal Pillar Applied to Fully-Mechanized Top Coal Caving Mining Face in Ultra Thick Seam

针对塔山矿特厚煤层综放工作面与回采巷道对头施工过程中面临的区段煤柱合理宽度留设、回采动压影响范围确定等问题,采用理论分析、数值模拟及现场应力实测等手段对特厚煤层综放采场覆岩断裂结构、区段煤柱应力分布及区段煤柱合理宽度进行研究。采空区一侧煤体应力,应力剧烈影响范围30~35 m。煤柱应力现场实测表明,相邻工作面回采期间应力沿煤柱宽度大致呈单峰型、非对称分布,应力高峰区距8210回风巷21~30 m、距8208采空区8~17 m,采空区顶板运动稳定滞后距离120~130 m。结果表明,塔山矿特厚煤层综放面对头施工条件下留设38 m煤柱是安全的,从煤柱应力分布角度分析煤柱宽度可减小至30~32 m。

According to the sectional coal pillar rational width applied,mining dynamic influence scope determination and other problems occurred in a face to face construction process of fully- mechanized top coal caving mining face and a mining gateway in ultra thick seam of Tashan Mine,the theoretical analysis,numerical simulation,site stress measurement and other means were applied to study the breaking structure of an overburden strata,stress distribution of the sectional coal pillar and rational width of the sectional coal pillar. The stress in one side of the coal seam in the goaf had a serious influence scope of 30 ~ 35 m. The site measurement of the coal pillar stress showed during a mining period of an adjacent coal mining face,along the coal pillar width,the stress was in a unimodal asymmetric distribution,stress peak zone had a distance of 21 ~ 30 m to No. 8210 air retuning gateway and had a distance of 8 ~ 17 m to No. 8208 goaf and the roof movement in the goaf was stabilized with a delay distance of over 120 ~ 130 m. The study results showed that under the condition of the face to face to construction of the fully- mechanized top coal caving mining face in ultra thick seam of Tashan Mine,the coal pillar with a set width of 38 m was safety and the coal pillar width could be reduced to 30 ~ 32 m from a view of the coal pillar stress distribution.