中南大学学报（自然科学版）2023，Vol.54Issue(12)：4720-4731,12.DOI:10.11817/j.issn.1672-7207.2023.12.011
浅埋偏压多洞室隧道洞口段施工力学特性现场试验研究
Field test study on construction mechanical behavior of entrance section of shallow-buried multi-chamber tunnel with biased pressure
摘要
Abstract
During the construction of a multi-arch road tunnel with multiple chambers and small-distance cross section that passes through a shallow-buried strata with biased pressure,the lining supporting structure of tunnel at entrance section is easily damaged,and subsequently,the construction safety and engineering progress of tunnel will be greatly affected.Based on a shallow-buried four-parallel-chamber road tunnel group with biased pressure,the in-situ monitoring was carried out with regard to the stress-strain variation law of primary lining and secondary lining of multi-chamber tunnel at entrance section subjected to the whole process of dynamic construction.The stress and deformation characteristics of tunnel supporting structure during different construction procedures were studied.The influence of tunnel excavation process on adjacent chamber was analyzed,and the corresponding construction suggestions were put forward.The results show that the deformation of steel arch in primary lining of motor-vehicle tunnel at bias shallow-buried side is the largest near the position of middle partition wall.Compared with the surrounding rock of tunnel,the intermediate rock at arch position between left and right motor-vehicle tunnels tends to be more unstable.Due to the influence of terrain bias,the left and right motor-vehicle tunnels show a significant asymmetric stress-strain characteristic,while the east and the west tunnels for pedestrians and non-motor vehicles do not show an obvious asymmetric stress-strain characteristic.The force of the primary lining of the left motor-vehicle tunnel(constructed in advance at shallow side)is larger than that of the right tunnel(constructed thereafter at deep side).Tunnel excavation presents a"leading perturbation effect"on the surrounding rock in front of the tunnel face.After the construction of supporting structure in shallow-buried tunnel,the bias effect of tunnel lining of tunnel at deep-buried side is weakened.关键词
多洞室隧道群/浅埋偏压/施工力学特性Key words
multi-chamber tunnel group/shallow-buried bias/construction mechanical characteristic分类
交通工程引用本文复制引用
林宇亮,卢思达,杨果林,张沛然,帅建国,付雄..浅埋偏压多洞室隧道洞口段施工力学特性现场试验研究[J].中南大学学报（自然科学版）,2023,54(12):4720-4731,12.基金项目
国家自然科学基金资助项目(51878667,51778641,51678571) （51878667,51778641,51678571）
湖南省自然科学基金资助项目(2021JJ30830,2018JJ2517)(Projects(51878667,51778641,51678571)supported by the National Natural Science Foundation of China （2021JJ30830,2018JJ2517）
Projects(2021JJ30830,2018JJ2517)supported by the Natural Science Foundation of Hunan Province) （2021JJ30830,2018JJ2517）
