Open AccessForce and deformation mechanism of great pipe shed advanced support in subway tunnel
Author(s) -
Lidan Li,
Dengkai Liu,
Yinghong Zhen,
Liu Zhao-xiang
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 - 10.1088/1755-1315/330/2/022035
Subject(s) - arch , structural engineering , displacement (psychology) , stress (linguistics) , deformation (meteorology) , engineering , catenary , finite element method , section (typography) , bearing (navigation) , geotechnical engineering , geology , computer science , psychology , linguistics , philosophy , oceanography , psychotherapist , operating system , artificial intelligence
Taking the construction of a certain section of Guiyang rail transit as an example, the theoretical analysis of the stress conditions and constraints of the pipe shed during tunnel excavation is carried out for the support parameters of the large pipe shed. By analyzing the force of the micro-segment of the pipe shed, bringing the Bernoulli-Euler beam theory formula into the equilibrium equation of the micro-segment, the governing differential equations of the pipe shed at the vault and the non-arch is obtained. Two types of pipe sheds are designed, and the numerical simulation of the tunnel with two structural forms of tunnel with advanced support of large pipe shed is carried out by using MIDAS/GTS NX finite element software, and the displacement and stress of the pipe shed are obtained and the theoretical verification is carried out. By comparing the displacement and vertical stress of the large tubular awning in plan 1 and plan 2, it is concluded that plan 2 is more reasonable and has better bearing capacity.