大倾角煤层回采巷道断面适应性

发布时间：2018-09-11 11:22

【摘要】：基于大倾角煤层回采巷道围岩应力显现规律,采用数值分析方法对不同类型断面巷道的围岩塑性区及应力非对称分布特征进行研究,并建立异形断面巷道围岩破坏力学模型,确定其合理的支护方式.结果表明,大倾角煤层回采巷道围岩塑性区沿煤层倾斜方向演化,顶底板破坏深度大于两帮,且两帮破坏程度差异大;巷道断面形状不同,导致巷道围岩应力集中程度、塑性区及变形量等有很大差异;拱形巷道围岩变形适应性好,异形巷道两侧的顶角煤易发生剪切破坏,但考虑回采巷道掘进、设备运行及服务年限等需求,常用异形巷道;采用"锚网+钢带+锚索"的支护形式,加强异形巷道顶板帮及坡顶煤的支护,满足支护阻力大于F1和F2,可明显减少巷道围岩变形,保持巷道的稳定性.
[Abstract]:Based on the stress behavior of surrounding rock of mining roadway in large inclined coal seam, the plastic zone of surrounding rock and the unsymmetrical distribution of stress of roadway with different cross sections are studied by numerical analysis method, and the failure model of surrounding rock of roadway with special-shaped section is established. Determine its reasonable support mode. The results show that the plastic zone of surrounding rock in mining roadway with large inclined angle evolves along the inclined direction of coal seam, the failure depth of roof and floor is greater than that of two sides, and the damage degree of the two sides is different, and the shape of roadway section is different, which results in the stress concentration degree of surrounding rock of roadway. There are great differences in plastic zone and deformation amount, the surrounding rock deformation adaptability of arch roadway is good, the roof coal on both sides of special-shaped roadway is prone to shearing failure, but considering the requirements of roadway excavation, equipment operation and service life, special-shaped roadway is commonly used. Adopting the support form of "anchor mesh steel belt anchor cable", strengthening the support of roof side and slope top coal of special-shaped roadway, satisfying the support resistance is larger than F1 and F2, it can obviously reduce the deformation of roadway surrounding rock and maintain the stability of roadway.
【作者单位】：重庆大学煤矿灾害动力学与控制国家重点实验室;重庆大学资源及环境科学学院;四川省煤炭产业集团有限责任公司;
【基金】：国家自然科学基金资助项目(51474039;U1361205) 重庆大学煤矿灾害动力学与控制国家重点实验室自主课题(2011DA105287-ZD201302)
【分类号】：TD322;TD353

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