浅埋偏压隧道围岩渐进破坏机制分析

为了研究浅埋偏压隧道围岩的渐进破坏过程和破坏模式,为隧道支护参数的确定提供依据。运用自行研制的隧道模型试验装置,对浅埋偏压工况下单洞及小净距隧道的破坏过程和破坏模式进行研究。研究表明:浅埋偏压隧道的破坏模式可以看作岩体在重力作用下的坍塌破坏,且浅埋偏压隧道的偏压角度和围岩的力学参数决定了破坏体的规模和范围,破坏体的范围主要受偏压角度的影响。

Study on Progressive Failure Mechanisms of Rock Mass of Asymmetrically-loaded Tunnel under Shallow Cover

The failure process and failure modes of shallow-covered and asymmetrically-loaded single-tube tunnels or shallow-covered and asymmetrically-loaded tunnels with small net spacing are studied by means of self-developed tunnel model testing facilities.The study results show that the failure of shallow-covered and asymmetrically-loaded tunnels can be regarded as the collapse failure under the action of gravity,the scale and scope of the failure depend on the asymmetrical loading angle of the shallow-covered and asymmetrically-loaded tunnel and depend on the mechanical parameters of the rock mass,with the scope of the failure mainly depending on the asymmetrical loading angle.