强冲击倾向性巨厚煤层水平应力致冲分析

Analysis of Horizontal Stress Induced Bursting of Huge Thick Coal Seam with Strong Bursting Tendency

以某强冲击巨厚煤层发生冲击事故为工程背景,采用理论分析、数值模拟等方式,分析了冲击案例及水平应力分布情况,水平应力致冲机理:水平应力致使煤层梁发生弯曲,弯曲梁底部受拉应力,当拉应力超出煤层梁的抗拉极限,发生极限弯曲致冲事故,并以此提出了煤层梁极限弯曲判据。同时,对机理进行了数值模拟验证,并基于冲击机理提出了防治措施,降低煤层梁的水平应力集中程度和增强煤层梁综合抗弯强度是解决煤层梁极限弯曲致冲的关键。

Taking the rockburst accident of a strong burst and huge thick coal seam as the engineering background,the rockburst case and the distribution of horizontal stress are analyzed by means of theoretical analysis and numerical simulation,and the punching mechanism of horizontal stress is as follows:The horizontal stress causes the bending of the coal seam beam,and the bottom of the bending beam is subjected to tensile stress.When the tensile stress exceeds the tensile limit of the coal seam beam,the ultimate bending accident occurs,and the ultimate bending criterion of the coal seam beam is proposed.At the same time,the numerical simulation is carried out to verify the mechanism,and the prevention and control measures are proposed based on the rockburst mechanism.Reducing the horizontal stress concentration of coal seam beam and enhancing the comprehensive strength of coal seam beam are the key to solve the ultimate bending scourging of coal seam beam.