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建立了冲击地压巷道围岩支护作用动力学模型,模型将上覆岩层简化为由多个质量块组成的块系,岩块简化为刚体,岩块间的连接简化为Kelvin-Voigt模型,把支护系统简化为弹簧和耗能阻尼器,初始岩块受冲击载荷作用。支护系统中阻尼为零时,为常规支护系统;支护系统中阻尼大于零时,为吸能防冲支护系统。分析得出:加强支护,提高支护强度,可以大幅度减少巷道冲击载荷作用下围岩加速度和位移幅值;支护系统中加入阻尼构件有利于快速平息围岩震动,增强支护抗冲击载荷能力,提高巷道围岩稳定性。提出了高强度吸能支护防治巷道冲击地压,为冲击地压巷道安全防冲支护设计提供理论依据。
The dynamic model of surrounding rock supporting in rockburst is established. The model simplifies the overburden rock into a block system composed of multiple mass blocks. The rock mass is simplified as a rigid body. The connection between the rock mass is simplified as Kelvin-Voigt model, The support system is simplified as a spring and a dissipative dampener. The initial rock mass is subjected to an impact load. When the damping in the support system is zero, it is the conventional support system; when the damping in the support system is greater than zero, it is the energy absorption and anti-impact support system. The analysis shows that strengthening the support and increasing the support strength can greatly reduce the acceleration and displacement amplitude of the surrounding rock under the impact load of the roadway. Adding the damping component to the support system is beneficial to quickly calm the surrounding rock and enhance the support impact resistance Load capacity, improve the stability of roadway surrounding rock. The paper puts forward that high strength energy absorption support can prevent and control roadway pressure, and provide a theoretical basis for the design of roadway safety impact protection.