Open AccessOptimization of tunnel construction parameters in soft rock section with high geostress
Author(s) -
Changjiang Li,
Yutong Zhang,
Chengming Liu,
Hengxiang Song,
Ke Li
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/587/1/012074
Subject(s) - excavation , geotechnical engineering , section (typography) , deformation (meteorology) , tunnel construction , geology , engineering , mining engineering , computer science , oceanography , operating system
Large deformation and even collapse are prone to occur in tunnel crossing high geostress soft rock section, which seriously restricts the construction progress. Therefore, it is necessary to optimize the construction parameters of high geostress soft rock section by bench method. Based on the Wu Nv Feng extra-long tunnel, this paper calculates and analyzes the surrounding rock deformation and structural stress under different excavation height, excavation length and excavation footage. The analysis shows that 2 / 3 h upper bench height can balance the influence of bench height on construction mechanics and construction convenience; considering the construction mechanical characteristics and excavation support time, the excavation height and excavation footage should be reduced as much as possible. Reasonable bench parameters play an important role in controlling the deformation of soft rock tunnel under high geostress, which can provide reference for tunnels with similar engineering geology and construction environment.