流固耦合作用对新建水底隧道近接施工影响分析
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摘要
为探索流固耦合在水底隧道近接施工中的影响,文中依托长沙地铁4号线下穿湘江近接南湖路隧道建立三维有限元模型,通过数值模拟研究流固耦合作用对新建隧道以及既有隧道的位移和应力的影响.研究发现:考虑流固耦合作用时,盾构隧道掘进扰动的范围更大,引起的变形也更大;有渗流和无渗流作用下土体的竖向沉降曲线与Peck沉降槽一致;在未考虑渗流场时,既有隧道水平向位移是整体趋向于远离新建隧道的方向,竖向位移是整体向上隆起;在考虑渗流场时,既有隧道管片水平位移是向隧道内收敛,竖向位移也是整体向上隆起,研究成果将对今后的类似工程建设提供指导作用.
In order to explore the influence of fluid-solid coupling on the construction of underwater tunnel,this paper has established a three-dimensional finite element model based on Changsha subway line 4 near Nan Hu Road tunnel, and studied the effect of fluid-solid coupling on the new tunnel and the existing tunnel displacement and stress. It is found that when the fluid-solid coupling effect is considered, the tunneling disturbance is larger and the deformation is bigger; the vertical settlement curve of the soil is consistent with the Peck sedimentation tank; when the seepage field is not considered, both the horizontal displacement of the tunnel tends to be far away from the direction of the new tunnel, and the vertical displacement is overall uplift;When considering the seepage field, the horizontal displacement of the tunnel segment is converging into the tunnel, the vertical displacement is also overall uplift. The research results can provide guidance for similar projects in the future.
In order to explore the influence of fluid-solid coupling on the construction of underwater tunnel,this paper has established a three-dimensional finite element model based on Changsha subway line 4 near Nan Hu Road tunnel, and studied the effect of fluid-solid coupling on the new tunnel and the existing tunnel displacement and stress. It is found that when the fluid-solid coupling effect is considered, the tunneling disturbance is larger and the deformation is bigger; the vertical settlement curve of the soil is consistent with the Peck sedimentation tank; when the seepage field is not considered, both the horizontal displacement of the tunnel tends to be far away from the direction of the new tunnel, and the vertical displacement is overall uplift;When considering the seepage field, the horizontal displacement of the tunnel segment is converging into the tunnel, the vertical displacement is also overall uplift. The research results can provide guidance for similar projects in the future.
引文
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[13]陈发本,杨卓,黄德镛.考虑渗流场作用下的富水隧道稳定性影响因素分析[J].交通科学与工程,2013,29(3):34-39.
[14]黄阜,潘秋景.地下水渗流作用下的盾构隧道开挖面安全系数上限分析[J].岩土工程学报,2017,39(8):1461-1469.
[2]李廷春,李术才,陈卫忠,等.厦门海底隧道的流固耦合分析[J].岩土工程学报,2004,26(3):397-401.
[3]吉小明,王宇会.隧道开挖问题的水力耦合计算分析[J].地下空间与工程学报,2005,1(6):848-852.
[4]原华,张庆贺.大直径越江盾构隧道各向异性渗流应力耦合分析[J].岩石力学与工程学报,2008,27(10):2130-2137.
[5]李鹏飞,张顶立,李兵,等.海底隧道施工过程中围岩稳定性的流固耦合分析[J].中国铁道科学,2010,31(3):35-41.
[6]夏炜洋.盾构法隧道施工期流固藕合问题研究[D].成都:西南交通大学,2011.
[7]汪优,王星华.考虑渗流的海底隧道围岩弹塑性分析[J].公路交通科技,2012,29(5):89-95.
[8]徐孟林.渗流水对隧道围岩应力及围岩位移影响的研究[D].大连:大连大学,2014.
[9]王浩然,黄茂松.考虑渗流影响的盾构隧道开挖面稳定上限分析[J].岩土工程学报,2013,35(9):1696-1704.
[10]齐春,何川.考虑流固耦合效应的水下盾构隧道受力特性[J].西南交通大学学报,2015,50(2):306-312.
[11]杨果岳,钟政意,林小城.强渗流条件下山岭分离式隧道围岩变形分析[J].地下空间与工程学报,2015(增刊2):388-393.
[12]雷海波.盾构隧道开挖面附近地下水渗流的数值模拟与解析近似[D].北京:北京交通大学,2016.
[13]陈发本,杨卓,黄德镛.考虑渗流场作用下的富水隧道稳定性影响因素分析[J].交通科学与工程,2013,29(3):34-39.
[14]黄阜,潘秋景.地下水渗流作用下的盾构隧道开挖面安全系数上限分析[J].岩土工程学报,2017,39(8):1461-1469.