高速列车振动荷载对近接隧道施工影响
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摘要
为降低高速列车振动荷载通过土体作用于在建隧道存在的安全风险,以济南轨道交通R2号线开源路站—烈士陵园站区间工程为研究对象,运用Flac3D软件模拟分析在不同近接距离下,盾构机推进过程中列车振动荷载对隧道施工的影响。研究表明:高速列车振动荷载加剧隧道管片变形,随着近接开挖距离增加振动荷载影响程度趋于缓和;振动荷载加剧土体塑性变形,地面与隧道管片之间部分土体承受张拉剪切协同破坏。
In order to reduce the safety risk of high-speed train vibration load through the soil acting on the tunnel under construction, based on the section project of Jinan Rail Transit R2 Line Kaiyuan Road Station-Martyrs Cemetery Station,Flac3 D software is used to simulate and analyze the impact of train vibration load on tunnel construction during the process of machine propulsion under different close distances. The research shows that the vibration load of high-speed trains intensifies the deformation of the tunnel segments, and the degree of vibration load tends to be moderate with the increase of the nearexcavation distance; the vibration load exacerbates the plastic deformation of the soil, and some soils between the ground and the tunnel segments are subjected to tensile shearing and collaborative destruction.
In order to reduce the safety risk of high-speed train vibration load through the soil acting on the tunnel under construction, based on the section project of Jinan Rail Transit R2 Line Kaiyuan Road Station-Martyrs Cemetery Station,Flac3 D software is used to simulate and analyze the impact of train vibration load on tunnel construction during the process of machine propulsion under different close distances. The research shows that the vibration load of high-speed trains intensifies the deformation of the tunnel segments, and the degree of vibration load tends to be moderate with the increase of the nearexcavation distance; the vibration load exacerbates the plastic deformation of the soil, and some soils between the ground and the tunnel segments are subjected to tensile shearing and collaborative destruction.
引文
[1]蔺云宏,李冀伟,王飞.暗挖地铁隧道斜交下穿既有铁路的施工研究[J].铁道工程学报,2012,29(11):82-86.
[2]胡众,邵迅,姚华彦,等.盾构隧道下穿既有城市隧道施工力学分析[J].四川大学学报(工程科学版),2016,48(S2):52-59.
[3]向章波.基于车辆震动荷载对隧道开挖施工的影响[J].水科学与工程技术,2017(5):61-65.
[4]陈云敏,边学成.高速铁路路基动力学研究进展[J].土木工程学报,2018,51(6):1-13.
[5]EASON G.The Stresses Produced in a Semi-Infinite Solid by a Moving Surface Force[J].International Journal of Engineering Sciences,1965(2):581-609.
[6]梁波,罗红,孙常新.高速铁路振动荷载的模拟研究[J].铁道学报,2006(4):89-94.
[2]胡众,邵迅,姚华彦,等.盾构隧道下穿既有城市隧道施工力学分析[J].四川大学学报(工程科学版),2016,48(S2):52-59.
[3]向章波.基于车辆震动荷载对隧道开挖施工的影响[J].水科学与工程技术,2017(5):61-65.
[4]陈云敏,边学成.高速铁路路基动力学研究进展[J].土木工程学报,2018,51(6):1-13.
[5]EASON G.The Stresses Produced in a Semi-Infinite Solid by a Moving Surface Force[J].International Journal of Engineering Sciences,1965(2):581-609.
[6]梁波,罗红,孙常新.高速铁路振动荷载的模拟研究[J].铁道学报,2006(4):89-94.