Study on the Effect of Steel Plate-Short Anchor Structure in Repairing Tension Lining Cracks.

In order to find out the effect of repairing tension lining cracks with steel plate-short anchor, this paper uses the general finite element software ABAQUS to compare the mechanical characteristics and failure modes of reinforced concrete lining before and after repairing with steel plate-short anchor under large eccentric compression. The results show that: (1) Compared with the unrepaired lining structure, the ultimate bearing capacity of the lining with 30%, 50% and 70% cracking repaired by steel plate-short anchor structure increases by 20.37%, 24.22% and 28. 36% respectively, and the mid-span deflection decreases by 54. 9%, 32.5% and 36.5% respectively; (2) Based on the mid-span deflection value corresponding to the ultimate bearing capacity when the lining crack degree is 70%, the mid-span deflection values are repaired from small to large by 30% < intact component < repaired 50% < repaired 70% < cracked 30% < cracked 50% < cracked 70%; (3) When the degree of lining crack is 30%, 50% and 70%, the maximum tensile stress of steel bar in lining after repairing with steel plate-short anchor decreases by 8.24%, 2.98% and 10. 90% respectively, and the maximum compressive stress decreases by 9.38%, 6.40% and 0.89% respectively; (4) When the lining structure is damaged, the failure modes of numerical simulation and model test are the same, which shows that the concrete on the compression side is crushed to different degrees. After repairing, the expansion of the original cracks in the lining is obviously restrained, the integrity of the lining structure is improved, and the risk of falling blocks and slag is reduced. The repairing of lining cracks by steel plate-short anchor structure is quick and minimally invasive. The above research conclusions provide some references for repairing and strengthening the lining cracks of operating railway tunnels. [ABSTRACT FROM AUTHOR]