Open AccessMechanical characteristics of karst tunnel lining structure under the action of groundwater from rainfall seepage
Author(s) -
Fei Wan,
Xuefeng Liu,
Xuan Zhang,
Shikuan Tian
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 - 10.1088/1755-1315/769/3/032056
Subject(s) - bending moment , geotechnical engineering , karst , arch , geology , groundwater , hydraulic structure , safety factor , load bearing , structural engineering , environmental science , engineering , paleontology
Heavy rainfall in areas with developed karst depressions will cause the water pressure behind the tunnel lining structure to rise rapidly, which brings about high safety risk of the lining structure. In order to determine the stress characteristics of the karst tunnel lining structure under the effect of rainfall seepage, a load-structure numerical model was established to analyze the changes in axial force, bending moment and safety factor under different water load conditions. The calculation results show that the single-point (small range) water pressure often leads to the damage of the arch and invert of the lining structure. When the pressure-bearing range increases, the damage of the foot and side wall of the lining structure tends to occur. When the overall range of the invert is subjected to water pressure, the damage of the lining structure from the invert to the side wall is likely to occur. Among them, the increasing pressure-bearing range is the most unfavorable water load state, and the safety factor of each part of the lining structure is significantly smaller than that in other three water load states. The research results can provide reference for the design of the lining structure section in similar conditions.