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<p>Slip rockburst are triggered by dynamic slip along pre-existing fault or newly generated shear fracture zone. To study its disaster-causing mechanism, based on the Froude similarity theory, this paper uses the detonating fuse as the explosion source, and using the geotechnical multi-functional test device to carry out the dynamic instability model test of the surrounding rock of the tunnel with fault under the action of the explosion plane wave. According to the data of acceleration, strain and displacement from the model test, the vibration and deformation characteristics of tunnel surrounding rock, the process of the slip-type rockburst and the models of dynamic failure are analyzed. The results show that under the action of explosive ground impact, vibration and deformation characteristic parameters such as acceleration, strain and displacement at the fault increase significantly, with the fault becoming the primary energy dissipation zone of the tunnel. Based on the principle of conversion measurement of cantilever beam deflection and strain, a cantilever beam structure displacement transducer was designed, which provides a new technology for the monitoring of fault slip. The disaster process of slip-type rockburst in tunnels with fault was successfully monitored by using a motion camera, and the disaster mechanism was summarized from the perspective of energy dissipation. According to the dynamic characteristics of slip-type rockburst, the process can be divided into several stages: the initiation of cracks on the fault, crack propagation, fault slip, block or particle ejection, and return to calm. Finally, by comparing and analyzing the characteristic parameters of vibration and deformation, as well as the process of slip-type rockburst and the dynamic failure results of the two models, it is concluded that when a fault passes through the arch foot and the straight wall of the tunnel is more likely to trigger severe slip-type rockbursts. The research findings provide valuable insights for the safe excavation and effective support of deep underground engineering projects.</p>

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Model Test Study on the Process and Mechanism of Slip-Type Rockburst Under Explosive Ground Impact

  • 期刊论文

  • 发表日期：

    2025年3月9日

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  • Yunqiang Wang,
  • Yeqing Chen,
  • Yongsheng He,
  • Chunhai Li

摘要

Slip rockburst are triggered by dynamic slip along pre-existing fault or newly generated shear fracture zone. To study its disaster-causing mechanism, based on the Froude similarity theory, this paper uses the detonating fuse as the explosion source, and using the geotechnical multi-functional test device to carry out the dynamic instability model test of the surrounding rock of the tunnel with fault under the action of the explosion plane wave. According to the data of acceleration, strain and displacement from the model test, the vibration and deformation characteristics of tunnel surrounding rock, the process of the slip-type rockburst and the models of dynamic failure are analyzed. The results show that under the action of explosive ground impact, vibration and deformation characteristic parameters such as acceleration, strain and displacement at the fault increase significantly, with the fault becoming the primary energy dissipation zone of the tunnel. Based on the principle of conversion measurement of cantilever beam deflection and strain, a cantilever beam structure displacement transducer was designed, which provides a new technology for the monitoring of fault slip. The disaster process of slip-type rockburst in tunnels with fault was successfully monitored by using a motion camera, and the disaster mechanism was summarized from the perspective of energy dissipation. According to the dynamic characteristics of slip-type rockburst, the process can be divided into several stages: the initiation of cracks on the fault, crack propagation, fault slip, block or particle ejection, and return to calm. Finally, by comparing and analyzing the characteristic parameters of vibration and deformation, as well as the process of slip-type rockburst and the dynamic failure results of the two models, it is concluded that when a fault passes through the arch foot and the straight wall of the tunnel is more likely to trigger severe slip-type rockbursts. The research findings provide valuable insights for the safe excavation and effective support of deep underground engineering projects.