松软破碎复合顶板沿空掘巷窄煤柱宽度与围岩控制技术
Study on narrow coal pillar width and surrounding rock control technology of gob-side entry driving with soft and broken composite roof
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摘要: 为了解决松软破碎复合顶板沿空掘巷煤柱宽度确定及其围岩控制难题，针对某矿21210工作面沿空掘巷复合顶板松软破碎、脱落离层甚至大面积冒顶等变形破坏特征；采用理论分析、数值模拟及工程实践等方法，综合确定其窄煤柱宽度为7 m；并提出了相应的围岩控制对策与技术。结果表明：内应力场宽度为11.8 m，靠近采空区侧与巷道侧的煤柱破坏宽度分别为2.5 m和1.8 m，窄煤柱合理宽度范围为5.6~7.3 m；7～11 m煤柱尺寸时，巷道顶板围岩塑性区减小，弹性核区范围扩大，有利于锚杆索在复合顶板中的锚固；采用7 m煤柱与“高强锚杆（索）槽钢桁架网+顶板注浆”联合支护技术后，实现了对松软破碎复合顶板沿空掘巷围岩的有效控制。Abstract: In order to solve the problem of determining the width of coal pillar and surrounding rock control in gob-side entry driving with soft and broken composite roof, in view of the deformation and damage characteristics of soft and broken composite roof in gob-side entry driving of 21210 working face of a mine, the width of narrow coal pillar is comprehensively determined to be 7 m by means of theoretical analysis, numerical simulation and engineering practice, and the corresponding surrounding rock control countermeasures and technologies are proposed. The results show that: the width of the internal stress field is 11.8 m, the failure width of the coal pillar near the goaf side and the roadway side is 2.5 m and 1.8 m respectively, and the reasonable width range of the narrow coal pillar is 5.6-7.3 m; when the coal pillar size is 7-11 m, the plastic zone of the surrounding rock of the roadway roof decreases, and the range of the elastic core zone expands, which is conducive to the anchoring of the anchor cable in ｔｈｅ ｃｏｍｐｏｓｉｔｅ ｒｏｏｆ； 7 ｍ ｃｏａｌ ｐｉｌｌａｒ ａｎｄ ｔｈｅ ｃｏｍｂｉｎｅｄ ｓｕｐｐｏｒｔ ｔｅｃｈｎｏｌｏｇｙ ｏｆ “ｈｉｇｈ－ｓｔｒｅｎｇｔｈ ｂｏｌｔ （ｃａｂｌｅ） channel steel truss mesh + roof grouting” can effectively control the surrounding rock in gob-side entry driving with soft and broken composite roof.
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