不同放煤工序煤岩体破断机理试验研究

Experimental Study on Breaking Mechanism of Coal Rock in Different Coal Discharge Process

为研究煤岩体放煤过程中采动应力规律及破坏机理,分析了在不同放煤工序下煤体的破断过程和规律以及煤岩体的力学强度及破坏模式。结果表明,顺序放煤时,在煤岩峰值应力附近出现了较大的变形,而间隔放煤和两端向中间放煤加载变形前期能量耗散较少,峰值后阶段的灾变破坏动能储备充分,易发生猛烈突然的能量急剧释放与破坏。

In order to study the mining stress law and failure mechanism in coal discharge process of coal rock mass,this paper simulates and analyzes the breaking process and law of coal mass under different coal discharge processes,and analyzes the mechanical strength and failure mode of coal rock mass.The results show that large deformation occurs near the peak stress of coal and rock during sequential caving,while energy dissipation is less in the early stage of deformation with interval caving and loading from both ends to the middle coal caving,and the kinetic energy reserve of catastrophic damage is sufficient in the post peak stage,which is prone to violent and sudden energy release and damage.