Model Experiment Study on Anti- explosion Characteristics of Underground Caverns Reinforced by External Cross-anchoring

摘要

The objective of this paper is exactly to assess the effect of anti-explosion for tunnels anchored outside under the condition of thin coating layer. To meet the similarity requirements, two groups of test models were made to simulate the responses of caverns under blast loading. It showed that: been anchored outside, displacements of the wall in caverns was decreased, so were the acceleration and compressive stresses with varying degrees, but the deformation stiffness and the overall stability were enhanced. This method does not take up space inside but it is beneficial to reduce the minimum thickness of protective layer and provides a new way to improve the anti-explosion performance for caverns under the conditions of thin coating layer.