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为研究动力弹射型岩爆发生机理和破坏特征,结合岩爆现场实录资料及理论分析,建立模拟动力弹射型岩爆的变截面杆模型,提出系统相对稳定度的概念,并分析了影响系统相对稳定度的参数,建立岩爆体应变率的反馈环,最后实验模拟了岩爆过程.结果表明,岩爆是由于隧洞围岩局部应力集中造成的,弹性体与岩爆体体积比、弹性体弹性模量与岩爆体软化系数之比均与系统相对稳定度呈负相关,岩爆发生的过程是一个正反馈调节的过程,在岩爆发生前,弹性体与岩爆体应变能持续累积,岩爆发生时瞬时释放,造成碎块弹射.分析结论与实验结果为研究动力弹射型岩爆的发生机制提供了参考.
In order to study the mechanism and damage characteristics of dynamic ejection rockburst, based on the field data and theoretical analysis of rockburst, a model of variable section rod that simulates dynamic ejection rockburst is established and the concept of relative stability of the system is proposed. The results show that the rockburst is caused by the local stress concentration in the surrounding rock of the tunnel. The volume ratio of the elastomer to the rock burst body, the elastic body The ratio of the elastic modulus to the softening coefficient of rock burst bodies is negatively correlated with the relative stability of the system. The rockburst occurrence process is a positive feedback process. Before the rock burst, the strain energy of the elastic body and rock burst body can be continuously accumulated, The instantaneous release of rockburst, resulting in debris ejection. Analysis and experimental results provide a reference for the study of the mechanism of dynamic ejection rockburst.