Field test and numerical simulation of initial support effect of negative Poisson's ratio anchor cable under strong impact and vibration

Bolt/cable support technology is widely used in the rock engineering protection field to limit large deformations of surrounding rocks, improve the anti-explosion and anti-impact mechanical properties of engineering rock mass, and increase stability and safety. The underground protective cavern suffers significant damage due to the powerful impact produced by the explosion. This paper studies the macro static and dynamic mechanical properties of the negative Poisson's ratio (NPR) constant resistance and large deformation anchor cable. In addition, an in-situ blasting test scheme is proposed to simulate the approximate plane wave generated by a nuclear explosion in the field. Hence, the anti-explosion and anti-impact properties of the NPR anchor cable support system and failure mode of ternary structure (rod body, anchor body, and rock mass) under explosion influence can be obtained. Finally, numerical modeling is utilized to validate the NPR anchor cable support and PR anchor bolt support under the high vibration condition with the same blasting equivalent. The findings showed that the cavern supported by the NPR anchor cable revealed better overall stability under strong impact and vibration than the PR anchor bolt.

Automated summary

Bolt/cable support technology is widely used in rock engineering protection to enhance stability and safety by limiting large deformations of surrounding rocks and improving mechanical properties. This paper studies the properties of a negative Poisson's ratio anchor cable and proposes an in-situ blasting test to simulate the impact of a nuclear explosion. Numerical modeling was utilized to validate the performance of the anchor cable support system under high vibration conditions. The findings show that the cavern supported by the negative Poisson's ratio anchor cable exhibits better stability under strong impact and vibration compared to anchor bolt support.