穿河地铁隧道施工对既有桥桩影响的数值模拟分析
|
摘要
以青岛地铁2号线汽车东站-东韩站区间穿越张村河段为工程依托,运用有限元软件ABAQUS建立3D模型,对地铁隧道穿越河流的动态施工全过程进行数值模拟,分别从桥隧不同间距、隧道不同埋深和有无地下水等三个不同影响因素,计算和分析地铁隧道开挖对既有桥梁桩体的受力和变形的影响规律。桥隧间距选取6 m、9 m、12 m、15 m和18 m,地铁隧道埋深选取4 m、5. 5 m和7. 5 m,并考虑有无地下水作用,在单一变量下共建立8组不同模型,通过模拟结果曲线的对比来分析不同因素的影响作用。结果表明,桥隧间距越近、埋深越大、有地下水作用时地铁隧道开挖引起的临近桥桩的影响就越大;而且在整个地铁施工过程中地铁基坑开挖到坑底时影响最大。
Based on the construction of the Qingdao Metro Line 2,the 3 D model is established by using the finite element software ABAQUS to simulate the whole process of the dynamic construction of subway tunnel through the river. Three different factors,such as the different spacing of the bridge and tunnel,the different buried depth of the tunnel,and the absence of groundwater,are carried out. The influence of subway tunnel excavation on the stress and deformation of the existing bridge piles is calculated and analyzed.The distance between the bridge and tunnel is selected as 6 m,9 m,12 m,15 m and 18 m. The buried depth of the subway tunnel is selected as 4 m,5. 5 m and 7. 5 m,and 8 different models are established under a single variable. The effects of different factors are analyzed by the comparison of the simulation results curve. The results show that the closer the distance between the bridge and the tunnel,the greater the depth of the buried underground,the greater the influence of the subway tunnel excavation on the adjacent bridge pile. In the whole subway construction process,the subway pit excavation to the bottom of the pit has the greatest impact.
Based on the construction of the Qingdao Metro Line 2,the 3 D model is established by using the finite element software ABAQUS to simulate the whole process of the dynamic construction of subway tunnel through the river. Three different factors,such as the different spacing of the bridge and tunnel,the different buried depth of the tunnel,and the absence of groundwater,are carried out. The influence of subway tunnel excavation on the stress and deformation of the existing bridge piles is calculated and analyzed.The distance between the bridge and tunnel is selected as 6 m,9 m,12 m,15 m and 18 m. The buried depth of the subway tunnel is selected as 4 m,5. 5 m and 7. 5 m,and 8 different models are established under a single variable. The effects of different factors are analyzed by the comparison of the simulation results curve. The results show that the closer the distance between the bridge and the tunnel,the greater the depth of the buried underground,the greater the influence of the subway tunnel excavation on the adjacent bridge pile. In the whole subway construction process,the subway pit excavation to the bottom of the pit has the greatest impact.
引文
[1]沈建文,刘力.盾构隧道施工对临近桥桩影响数值及现场监测研究[J].岩土力学,2015,36(s2):709-714.
[2]高伟,韩昌瑞,等.浅埋暗挖隧道对桥梁基础的影响分析[J].公路,2012,(11):123-128.
[3]孙斌,陶连金,张印涛.岛式地铁车站施工对邻近桥梁桩基的影响分析[J].地下空间与工程学报,2009,5(1):163-16.
[2]高伟,韩昌瑞,等.浅埋暗挖隧道对桥梁基础的影响分析[J].公路,2012,(11):123-128.
[3]孙斌,陶连金,张印涛.岛式地铁车站施工对邻近桥梁桩基的影响分析[J].地下空间与工程学报,2009,5(1):163-16.