Anti-explosion and reinforcement effects on a cavern with a new prestressed anchor cable

Abstract

Traditional cavity reinforcement technology is difficult to effectively protect the cavity from damage caused by modern large-yield explosions, and the anti-explosion performance of prestressed anchor cables needs to be improved urgently. The design of a new prestressed high-elastic fully adhesive anchor cable for the enhancement of the anti-explosion effects of the anchor cable is presented in this paper. A constitutive model of the anchor cable is established in FLAC 3D and used to restore an equal scale field anti-explosion test. The reinforcement effects of the new anchor cable are compared with the conventional one’s. Results show that the stresses of the anchor cables differ at different locations: the anchor cable at the arch crown of the cavern is the one mainly under pressure with the compressive strain of the new anchor cable reduced by 25 %; while the anchor cable at the arch foot of the cavern is the one mainly under tension and the tensile strain of the new anchor cable is reduced by 26.3 %. The vertical displacement of the arch crown is reduced by 16.2 % with the reinforcement of the new anchor cable. The new anchor cable performs much better on the reinforcement of the cavern than the conventional one in the aspects of stress, strain and displacement, which provides a basis for the design of new anchor cables and their applications in engineering.