沿空留巷充填区域直接顶受力状态探讨与应用

发布时间：2018-03-05 06:32

本文选题：沿空留巷　切入点：充填区域　出处：《煤炭学报》2017年08期 　论文类型：期刊论文

【摘要】：针对综采放顶煤、复合顶板等松软破碎顶板沿空留巷直接顶稳定控制难题,根据沿空留巷顶板活动的时空特征,建立了沿空留巷充填区域直接顶弹性损伤力学模型,推导了充填区域直接顶应力分布表达式,研究了充填区域直接顶应力分布演化规律,进而得到了充填区域直接顶拉应力范围和水平错动范围计算式及相应的演化规律。结果表明:充填区域直接顶受力状态受基本顶回转下沉角和直接顶损伤变量的影响,随着基本顶回转下沉角的增加,拉应力作用范围逐渐减小,水平错动范围逐渐增大。结合新元煤矿3107工作面沿空留巷的工程地质条件,提出了分区域动态加固沿空留巷充填区域直接顶的控制对策,工程应用表明,沿空留巷充填区域顶板下沉量得到了有效地控制,沿空留巷围岩稳定性较好。
[Abstract]:Aiming at the difficult problem of direct roof stability control of soft broken roof such as fully mechanized caving caving and composite roof, according to the space-time characteristics of roof movement along goaf, a mechanical model of direct roof elastic damage in filling area along goaf is established. The expression of direct top stress distribution in filling area is derived, and the evolution law of direct top stress distribution in filling area is studied. The formulas of direct top tension stress range and horizontal dislocation range in filling area and the corresponding evolution law are obtained. The results show that the stress state of direct top in filling area is affected by the basic top rotation subsidence angle and the direct top damage variable. With the increase of the angle of turning and sinking of the basic roof, the action range of tensile stress decreases gradually, and the range of horizontal dislocation gradually increases. Combined with the engineering geological conditions along the gob of 3107 face of Xinyuan Coal Mine, The control measures of the direct roof in the filling area along the gob are put forward. The engineering application shows that the roof subsidence in the filling area along the goaf is effectively controlled and the surrounding rock stability along the gob is better.
【作者单位】：湖南科技大学南方煤矿瓦斯与顶板灾害预防控制安全生产重点实验室;辽宁工程技术大学煤炭资源安全开采与洁净利用工程研究中心;中国矿业大学煤炭资源与安全开采国家重点实验室;
【基金】：国家自然科学基金资助项目(51574227,51434006) 辽宁省煤炭资源安全开采与洁净利用工程研究中心开放基金资助课题(LNTU16KF04)
【分类号】：TD353

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