论文部分内容阅读
针对冲击矿压显现主要发生在巷道的现状,运用理论分析、数值模拟及工程实践等方法,研究了P波作用下锚固巷道围岩与锚杆动态响应规律.结果表明:巷道迎波侧与侧向位置是重点支护位置;应力波作用是迎波侧围岩变形的主导因素,迎波侧锚杆轴应力先小幅下降而后迅速增大,最后稳定在峰值,而主次承载结构不同的动态响应是侧向位置围岩变形的主导因素,侧向位置锚杆轴应力呈“双峰”特性;结合现场分析了围岩层裂垮落与锚杆冲击拉断两种典型的破坏类型,并从改善支护参数和煤岩体强度弱化两方面提出了防冲建议.
Aiming at the present situation that the rock burst occurs mainly in the roadway, the dynamic response law of surrounding rock and rock bolt in the roadway with P wave is studied by means of theoretical analysis, numerical simulation and engineering practice. The results show that: The location of stress is the key support location. The stress wave is the dominant factor in the deformation of the surrounding rocks on the Yingbo side. The stress of the rock bolts on the Yingbo side decreases first and then increases rapidly, and finally stabilizes at the peak value. However, The response is the dominant factor of surrounding rock deformation in the lateral position, and the stress of the anchor shaft in the lateral position is characterized by “double peak”. Based on the field analysis, two typical types of failure , And proposed the anti-flushing suggestions from two aspects of improving support parameters and weaken the strength of coal and rock mass.