高应力区矩形巷道底板冲击力学机理及控制研究

Research on rock burst mechanics mechanism and its control technology in rectangular roadway floor of high stress zone

为揭示矩形巷道底板冲击地压多发的力学原因,基于现场调研、理论分析、力学模型、数值计算等方法,综合研究了高应力区底板冲击的力学机理,并据此提出底板冲击地压的有效防控技术.结果表明:构造应力区的水平应力升高是导致巷道底板发生冲击性破坏的主要原因.原岩应力中水平应力增大,巷道开挖后的底板水平应力增加而垂直应力基本不变;原岩应力中垂直应力增大,巷道开挖后的底板水平应力和垂直应力都增加,该结论利用数值模拟方法得到验证.提出了底板强度弱化控制冲击地压的理念与技术措施,基于数值计算验证了该理念的有效性,同时提出了底板弱化防冲技术参数.

In order to reveal the mechanical reasons of the frequent occurrence of rock burst on the floor of rectangular roadways,the mechanical mechanism of rock burst in high stress area was comprehensively researched,and the effective prevention and control of rock bursts technologies were put forward accordingly based on site investigations,theoretical analysis,mechanical models,numerical calculations and other methods.The results show that the increase of the horizontal stress in the structural stress zone is the main reason for the rock burst damage of the roadway floor.Both the horizontal stress in the original rock stress and the horizontal stress after the roadway excavation increased,while the vertical stress of the floor was basically unchanged.However,the vertical stress in the original rock stress increased;the floor horizontal stress and vertical stress after the excavation of the roadway increased,too.It is verified by numerical simulation method.The concept and technical measures of weakening the floor strength to control the rock burst were put forward,the effectiveness of the concept was verified based on the numerical calculation.At the same time,the technical parameters of the weakening and preventing from the rock burst of the floor were proposed.