【摘要】 采用模拟试验方法研究了顶板岩层对煤体应力状态的影响,并根据震动能量对煤体的破坏效应和在岩体中的传播衰减规律,从能量角度分析了煤层上方不同厚度和强度的顶板岩层对煤体冲击的影响程度.结果表明,顶板释放的能量与岩层强度呈对数关系、与顶板厚度呈指数关系,坚硬、厚层顶板岩层会对煤体产生更为强烈的扰动,使冲击矿压危险性明显升高.另外,具有一定厚度和强度且距离煤层较近的老顶岩层运动产生的冲击载荷对煤体的影响作用较大.某矿一个工作面的冲击矿压防治工程实践表明,对该煤层上方的顶板岩层实施爆破弱化处理技术措施后,可有效降低工作面回采过程中的冲击危险性.更多还原

【Abstract】 The influence of the roof stratum on the stress state of a coal mass was studied by simulation methods.The attenuation of seismic waves through the rock mass,and the damage from the action of seismic energy on the coal mass,was treated by considering the energy of the waves.The danger of rock burst was analyzed by considering roof strata of different thicknesses and strengths.The energy released during roof rupture is logarithmically related to the roof stratum strength and exponentially related to its thickness.A harder and thicker roof stratum generates higher dynamic stresses on the coal mass and increases the danger of rock burst.Strata of a particular thickness and strength located near the coal seam often have greater influence on rock burst.Control practices at the working face of one coal mine suggested pre-splitting the roof strata above the coal seam by blasting can reduce the danger of rock burst.更多还原