Open AccessStudy on Mechanical Characteristics of Support Structure in Tunnel Entance Section under Mechanized Construction
Author(s) -
Hongyan Guo,
Dengzhi Tang,
Chengrui Yao,
Xiaolong Zhang
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/643/1/012053
Subject(s) - ultimate tensile strength , arch , structural engineering , section (typography) , face (sociological concept) , reinforcement , stress (linguistics) , geotechnical engineering , engineering , cross section (physics) , materials science , composite material , computer science , physics , social science , linguistics , philosophy , quantum mechanics , sociology , operating system
In view of the mechanical characteristics of the support structure under the mechanized construction conditions of the shallow buried section of the tunnel entrance, numerical simulation methods are used to compare and analyze the different cycle footage and the different tunnel face depth before and after the tunnel face reinforcement been carried out when the shallow buried section of the tunnel entrance is constructed by the micro-step method. The results of the study show that the primary support and pipe shed force increases with the increase in the depth of the tunnel face (buried depth), and decreases with the increase of the cyclic footage; When the fiberglass bolt is used to reinforce the face, the axial tensile stress of the fiberglass bolt can reach 18kN; Without reinforcement of the tunnel face, the primary support of the arch at the entrance of the tunnel is vulnerable to cause tensile damage; After the tunnel face is reinforced, the tensile stress of the primary support is significantly reduced.