摘要
2203胶带巷是新桥矿第1个留小煤柱的沿空巷道,依据新桥矿2203工作面的地质资料及井下实际调研,分析巷道围岩结构及特点,通过理论分析并运用离散元数值计算软件FLAC5.0,分析了不同煤柱宽度下巷道围岩应力分布及位移情况,确定该巷道合理煤柱宽度为5.5 m;结合煤柱宽度,并运用数值模拟分析了不同支护方案下巷道围岩应力分布及位移情况,确定了该巷道最优锚杆支护参数。同时提出了一套强调附件整体支护强度、刚度和高预紧力的沿空掘巷围岩控制技术,巷道采用高强锚杆、长锚索及高刚度的M型钢带加沿空帮桁架联合支护形式,有效控制了巷道在不同时期的变形。通过矿压观测,巷道维护效果良好,实现了预期目标。
2203 belt roadway is the first roadway driving along goaf with small pillar of Xinqiao Coal Mine.Based on geological data and actual investigation of 2203 working face,structure and characteristics of surrounding rock were analysed through theoretical analysis,discrete element numerical simulation software FLAC5.0 was used to analyse pressure distribution and displacement law with different small pillar width.Ultimately it determined reasonable coal pillar width as 5.5 m.Combined with small pillar width,it also analysed pressure distribution and displacement law with different supporting schemes using numerical simulation,and determined the optimal supporting parameter of this roadway.The paper also put forward surrounding rock supporting technology of roadway driving along next goaf which emphasizes attachment overall support strength,stiffness and high pre-tightening force.Roadway deformation was controlled well in different periods using supporting methods combined with high-strength bolt,long anchor,high stiffness M beam and truss supporting along gob wall.Through mineral pressure observation,effects of roadway maintenance were well,desired goal was achieved,too.
出处
《中州煤炭》
2011年第2期45-48,共4页
Zhongzhou Coal
基金
教育部科学技术研究重点项目资助(109075)
关键词
沿空掘巷
煤柱宽度
数值模拟
联合支护
围岩稳定
gob-side entry driving
coal pillar width
numerical simulation
combined supporting
stability of surrounding rock
