Open AccessCase study on the model test of staggered-jointed assembling shield tunnel structure reinforced by bonded steel plates under large deformation
Author(s) -
Xuezeng Liu,
Haoran Lai,
Yun-long Sang
Publication year - 2019
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/330/2/022080
Subject(s) - deformation (meteorology) , shield , structural engineering , reinforcement , materials science , expansive , bending , failure mode and effects analysis , slab , transverse plane , geotechnical engineering , composite material , geology , engineering , compressive strength , petrology
Transverse large deformation is one of the main diseases of metro shield tunnels, gravely threatening the safe operation of tunnel structure. Reinforcing bonded steel plates is a primary means for repairing excessively deformed tunnels. Nevertheless, evaluations and analyses on the reinforcing effect of bonded steel plates are currently unclear. Therefore, destruction tests were performed on the tunnel without the reinforced structure and on the excessively deformed tunnel with the reinforced structure respectively with the similar model test method in this paper, so as to analyse deformation behaviours and failure modes of segment lining and compare the reinforcing effect. Test results show that the carrying capacity of the tunnel structure can still be improved through reinforcing the staggered-jointed assembling shield tunnel with bonded steel plates under large deformation; also, the reinforcement of bonded steel plates can effectively prevent the tunnel from deforming. The failure mode of the reinforced structure consists of the reinforcement interface debonding failure and steel plate bending failure. To be specific, the debonding failure being frequently detecting in seams is composed of slab staggering and expansive debonding. Research achievements in this paper may provide theoretical and data support for similar reinforcement projects.