中文摘要：

王洼煤矿11采区综放工作面地质条件相对复杂，需要确定合理的区段煤柱参数以指导现场安全生产。通过对王洼煤矿区段煤柱进行应力和钻孔窥视实测的技术手段，研究煤柱内部破坏情况。结果表明：沿煤柱走向方向上应力峰值在工作面前方10m左右，沿倾向方向上煤柱破坏区域在3m以内，在煤柱内6m左右处应力达到峰值；并通过数值模拟分析了在该生产条件下不同煤柱尺寸的应力分布规律，当煤柱宽度增加到26m时，煤柱有一定弹性核区，随着煤柱宽度的加大弹核区的宽度也逐渐增加，煤柱宽度增加到29m和32m时，已经能够保证煤柱的稳定性，巷道变形在容许的范围内。在实测和模拟相结合的基础上，综合分析得到了该区域合理区段煤柱尺寸为30m，与以往煤柱宽度相比大幅降低了煤柱宽度，提高了资源回收率。

英文摘要：

Due to the complex geological conditions of No. 11 mining district of fully mechanized top - coal caving face in Wangwa Coal Mine, the reasonable parameter of section coal pillar is important to guide the safety production. According to t stress measurement and borehole imaging in the coal pillar, the internal damage of coal pillar is revealed. The result indicates that, the peak stress along the strike of coal pillar appears at 10m ahead of the working face, and the failure region is within 3m along the dip of coal pillar, and the peak stress apears around 6m in the coal pillar. Further, the stress distribution rules of coal pillars with different size are analyzed by numerical simulation under the same production condition, which shows that the coal pillar gets some elastic region when the coal pillar width increases to 26m, with the increase of the coal pillar width, the elastic region width also increases, and when the coal pillar width increases to 29m and 32m, it can guarantee the stability of coal pillar and the roadway deformation is within permitted range. According to the results of field monitoring and numerical simulation, reasonable size of the section coal pillar is 30m. Compared with the previous pillar, the research result greatly reduces the pillar width and improves the recovery rate of coal resources.