关键词: CFRP加固;胶层厚度;界面应力;有限元分析;输水隧洞;

Abstract: Affected by the flow scouring in the water conveyance tunnel, the unevenness of surface of the lining concrete may result in a change in the local thickness of the adhesive layer.In this paper, the effect of the inhomogeneous thickness of the adhesive layer on the stress state at the interface of CFRP-lining concrete was investigated using the finite element method.Based on the solid-spring-solid 3D finite element model, notches were placed in the adhesive layer element and the lining concrete element to simulate the bumps, grooves and bubbles.By changing the position, depth and length of the notches, the stress state of the interface with different notches were analyzed.The results showed that compared with the convex and groove, the bubbles were the most disadvantageous factor to the structure.With the increasing of bubble depth and length, the concentration of radial stress at the interface increased significantly.Therefore, after the CFRP paste is completed, the paste quality of CFRP should be checked in detail, and for the parts with air bubbles, it is recommended to use syringe injection and other methods to deal with them.

Key words: CFRP reinforcement; adhesive layer thickness; interface stress; finite element analysis; water transmission tunnel;