Open AccessKey technology of overlapping tunnel construction with earth pressure balance shield method in rheological strata
Author(s) -
Qingru Yu,
Shihong Zhai,
Wen Li,
Tianrui Liu,
Song Hu
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2011/1/012024
Subject(s) - shield , settlement (finance) , geotechnical engineering , foundation (evidence) , bridge (graph theory) , quantum tunnelling , geology , tunnel construction , lateral earth pressure , finite element method , deformation (meteorology) , rheology , stress (linguistics) , engineering , structural engineering , civil engineering , computer science , materials science , petrology , medicine , linguistics , oceanography , philosophy , optoelectronics , archaeology , composite material , world wide web , payment , history
Based on the existing bridge structure of Foshan Metro Line 2, this paper summarizes the engineering geological conditions of the overlapping tunnels, uses three-dimensional finite element analysis, establishes an engineering geological model, and analyzes the parameters of the upper tunnel in the disturbed surrounding rock, shield attitude control and its influence on the tunnels already built on the lower floors. Finally, the monitoring and control results during the construction of the shield tunneling of the overlapping tunnels are analyzed to verify that the construction of the overlapping tunnels in the rheological strata has a greater impact on the ground settlement of about 20m, and the soft foundation reinforcement of the lower tunnels in advance can make the soil settlement greatly reduced, and the stress concentration area is reduced. After the double-tube jet-grouting piles are reinforced, the shield tunneling of the upper overlap tunnel has little effect on the existing tunnel below, and the reinforcement effect is better, which can make the construction go successfully. The analysis results of this paper can provide decision support for the construction of overlapping tunnels in rheological strata.