冒落矿震强度预测试验研究

摘要

Underground engineering structures losing its stability is possibly induced by cave-in mine tremor, resulting in large cave-in of rocks roof in mined-out area. Based on velocity to measure the shock strength of mine, this paper summarized the relationship between the vibration velocity of base rock and the potential energy of fall rocks by the laboratory impact experiment of rock block fallings. Based on this, through tests of throwing rocks, the vibration effect caused by the impact of rocks to floor and the attenuation rules of velocity in rock layers are discussed and studied, establishing a strength prediction model of the cave-in mine tremor in mined-out area.%冒落矿震可能诱发一定范围内地下工程失稳,导致更大范围内采空区大面积冒落.基于振速来衡量矿震强度,通过室内岩石块落物冲击试验,总结了下落岩块位势能与诱发基座振动速度的关系;在此基础上,通过在井下特定环境下的抛掷岩石块测振试验,探讨了岩石冲击底板引发的振动效应,并研究了岩层中振速的衰减规律,建立了采空区冒落矿震强度的预测模型.