Repairing and strengthening method for large cracks on rock tunnel lining

Abstract

The invention relates to a repairing and strengthening method for large cracks on a rock tunnel lining. The method consists of the three steps: a lining faulting repair process; an anchor rod grouting and reinforcing process; a steel sheet strip reinforcing and arranging process, wherein the key problem of carrying out faulting repair is the selection of a plugging material and epoxy resin mortar is adopted in the repair process; the anchor rod grouting and reinforcing process is used for reinforcing primary support at the tunnel lining at the faulting section to prevent surrounding rock from further deforming, and carrying out anchor rod grouting and reinforcing; the steel sheet strip reinforcing and arranging process is used for enabling a steel sheet strip and a secondary lining to cooperatively deform to bear together through the connection and force transfer actions of anchor bolts and sticky steel glue to form a reinforced structure of a composite beam plate. The composite beam plate can be used for enhancing the structure rigidity, improving the stability and the integrity, improving the ductility, the fire resistance and the durability of the structure and effectively improving the bearing force of the tunnel lining. The treatment measures of the reinforcing method disclosed by the invention have favorable reinforcing effects on an original tunnel structure, are simple and feasible to construct and have better economy.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, and relates to a method for repairing and reinforcing circumferential, longitudinal and oblique cracks in rock tunnel lining. Background technique [0002] In recent years, with the continuous increase of the scale of highway and railway tunnels in our country, the diseases of tunnel lining structures during operation have become more and more prominent. According to the statistical data of 5000 tunnel surveys, 1 / 3 of the tunnels have lining structure cracks and water leakage. Such situations will bring great hidden dangers to the long-term safe operation of the tunnel. [0003] Tunnel lining crack reinforcement has always been the focus of tunnel engineering research, and designing corresponding reinforcement methods for different crack problems is an urgent problem to be solved. At present, reinforcement technologies such as bonded steel, carbon fiber, and enlarged section hav...

AI Technical Summary

Problems solved by technology

At present, reinforcement technologies such as bonded steel, carbon fiber, and enlarged section have been applied to repair general cracks, but they all have relatively large limitations and cannot be used in the case of large cracks or even vertical displacement in the tunnel lining. Today, the reinforcement technology of the tunnel lining structure with large cracks has not yet formed a complete set of technical solutions, which brings great challenges to designers and construction personnel who face such problems

Images