浅埋超长工作面裂隙梁铰拱结构稳定性分析及数值模拟研究

发布时间：2018-03-21 14:37

  本文选题：浅埋煤层　切入点：超长工作面　出处：《岩土力学》2016年01期 　论文类型：期刊论文

【摘要】：以超长工作面基本顶初次断裂所成铰拱结构为力学模型,在铰接端接触面按照应力指数分布规律,得出新的水平推力公式。通过严格几何变形推导出铰接端变形量与下沉量,结合数值模拟与现场实例进行验算,应用新的推力公式对结构稳定性进行判断。与传统近似建模方法相比,经研究发现:针对浅埋超长工作面,在回转角小于3°时,块度i0.40的断块所受推力随工作面长度、回转角变大而以微小变化率增加,块度i0.45时断块不发生滑落失稳;块度i≤0.30的断块所受水平推力T增幅明显,若回转角?超过6°,断块易因T过大而发生变形失稳;新公式代入实例得出的回转稳定区范围比传统范围至少大12%。给出了浅埋裂隙梁结构允许埋深公式,对浅埋超长工作面裂隙结构失稳预测有参考价值。
[Abstract]:Taking the hinged arch structure formed by the primary fracture of the basic top of the super-long working face as a mechanical model, a new horizontal thrust formula is obtained according to the distribution law of stress exponent on the contact surface of the hinged end. The deformation and subsidence of the hinge end are derived by strict geometric deformation. Combined with numerical simulation and field example, the new thrust formula is used to judge the stability of the structure. Compared with the traditional approximate modeling method, it is found that when the rotation angle is less than 3 掳for the shallow buried super-long face, The thrust of block i0.40 increases with the length of working face, the rotation angle increases with small change rate, and the block does not slip and lose stability when I 0.45, the horizontal thrust T of block I 鈮，

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