地铁大跨暗挖隧道下穿桥隧结构变形影响分析
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摘要
以某地铁工程中单洞双线暗挖隧道下穿桥隧结构为例,通过实测数据分析及数值模拟验证,得出:在现有施工方法及地层条件下,上部既有桥隧结构的变形整体符合Peck单凹槽曲线,其中既有隧道结构沉降曲线比既有桥梁结构沉降曲线更接近Peck公式;地层损失率在0.20%～0.24%之间。分析结果说明,三维数值模拟可较为准确地预测上覆既有桥隧结构的沉降趋势,模拟结果与实测值差异较小。
Focusing on the deformation characteristics of bridge and tunnel structure when the large-span underground excavation tunnel crossing under them simultaneously, based on a double-tracked single-bored metro tunnel, the measured data are analyzed and validated with numerical simulation. It is concluded that in the fixed conditions of construction and stratum, the whole deformation of the upper existing bridge and tunnel structure conforms to Peck single groove curve, in which the subsidence curve of tunnel structure is closer to Peck formula than that of the bridge structure; according to the fitting data, the ground loss ratio in this condition ranges from 0.2% to 0.24%. A three dimensional numerical simulation could predict accurately the settlement trend of the upper bridge and tunnel structure, and simulation result has only slight difference from the measured data.
Focusing on the deformation characteristics of bridge and tunnel structure when the large-span underground excavation tunnel crossing under them simultaneously, based on a double-tracked single-bored metro tunnel, the measured data are analyzed and validated with numerical simulation. It is concluded that in the fixed conditions of construction and stratum, the whole deformation of the upper existing bridge and tunnel structure conforms to Peck single groove curve, in which the subsidence curve of tunnel structure is closer to Peck formula than that of the bridge structure; according to the fitting data, the ground loss ratio in this condition ranges from 0.2% to 0.24%. A three dimensional numerical simulation could predict accurately the settlement trend of the upper bridge and tunnel structure, and simulation result has only slight difference from the measured data.
引文
[1] 陈梦乔,杨广武.新建地铁车站近距离穿越既有地铁隧道的变形控制[J].中国铁道科学,2011,32(4):53.
[2] 张成平,张顶立,王梦恕.大断面隧道施工引起的上覆地铁隧道结构变形分析[J].岩土工程学报,2009,31(5):805.
[3] 张成平,张顶立,吴介普,等.暗挖地铁车站下穿既有地铁隧道施工控制[J].中国铁道科学,2009,30(1):69.
[4] 李倩倩,张顶立,房倩,等.浅埋暗挖法下穿既有盾构隧道的变形特性分析[J].岩石力学与工程学报,2014,33(增刊2):3911.
[5] 白海卫,何海健,李玲.正交下穿施工对上部既有隧道安全的影响研究[J].地下空间与工程学报,2014,10(2):434.
[6] 张晓光,剧亮,李菲.暗挖隧道下穿跨河桥部分桥桩的影响分析及对策——以北京地铁14号线北工大站—平乐园站区间为例[J].隧道建设,2015,35(7):692.
[7] 杨广武,赵江涛,苏洁.地铁施工对既有桥梁桩基的影响研究[J].都市快轨交通,2014,27(3):40.
[8] 马伟斌,付兵先,杜晓燕,等.地铁隧道下穿铁路桥施工变形分析及处理措施[J].地下空间与工程学报,2013,9(4):896.
[9] PECK R B.Deep excavations and tunneling in soft ground[C]//Proceedings of the 7th International Conference of Soil Mechanics and Foundation Engineering.Mexico:[s.n.],1969:225.
[10] ATTEWELL P B,YEATES J,SELBY A R.Soil movements induced by tunnelling and their effects on pipelines and structures[M].Glasgow:Blackie and Son,1986:10.
[11] RANKIN W J.Ground movement resulting from urban tunnelling:predictions and effects.engineering geology of underground movements[C]// Proceedings of the 23rd Annual Conference on the Engineering Group of the Geological Society,UK.Nottingham:Nottingham University,1988:79.
[12] MAIR R J,TAYLOR R N,BRACEGIRDLE A.Subsurface settlement profiles above tunnels in clays[J].Geotechnique,1993,43(2):315.
[13] 韩煊,刘赪炜,JAMIE R.隧道下穿既有线的案例分析与沉降分析方法[J].土木工程学报,2012(1):134.
[14] 韩煊,李宁,JAMIE R.地铁隧道施工引起地层位移规律的探讨[J].岩土力学,2007,28(3):609.
[15] 王剑晨,张项立,张成平,等.浅埋暗挖隧道近距施工引起的上覆地铁结构变形分析[J].岩石力学与工程学报,2014,33(1):90.
[2] 张成平,张顶立,王梦恕.大断面隧道施工引起的上覆地铁隧道结构变形分析[J].岩土工程学报,2009,31(5):805.
[3] 张成平,张顶立,吴介普,等.暗挖地铁车站下穿既有地铁隧道施工控制[J].中国铁道科学,2009,30(1):69.
[4] 李倩倩,张顶立,房倩,等.浅埋暗挖法下穿既有盾构隧道的变形特性分析[J].岩石力学与工程学报,2014,33(增刊2):3911.
[5] 白海卫,何海健,李玲.正交下穿施工对上部既有隧道安全的影响研究[J].地下空间与工程学报,2014,10(2):434.
[6] 张晓光,剧亮,李菲.暗挖隧道下穿跨河桥部分桥桩的影响分析及对策——以北京地铁14号线北工大站—平乐园站区间为例[J].隧道建设,2015,35(7):692.
[7] 杨广武,赵江涛,苏洁.地铁施工对既有桥梁桩基的影响研究[J].都市快轨交通,2014,27(3):40.
[8] 马伟斌,付兵先,杜晓燕,等.地铁隧道下穿铁路桥施工变形分析及处理措施[J].地下空间与工程学报,2013,9(4):896.
[9] PECK R B.Deep excavations and tunneling in soft ground[C]//Proceedings of the 7th International Conference of Soil Mechanics and Foundation Engineering.Mexico:[s.n.],1969:225.
[10] ATTEWELL P B,YEATES J,SELBY A R.Soil movements induced by tunnelling and their effects on pipelines and structures[M].Glasgow:Blackie and Son,1986:10.
[11] RANKIN W J.Ground movement resulting from urban tunnelling:predictions and effects.engineering geology of underground movements[C]// Proceedings of the 23rd Annual Conference on the Engineering Group of the Geological Society,UK.Nottingham:Nottingham University,1988:79.
[12] MAIR R J,TAYLOR R N,BRACEGIRDLE A.Subsurface settlement profiles above tunnels in clays[J].Geotechnique,1993,43(2):315.
[13] 韩煊,刘赪炜,JAMIE R.隧道下穿既有线的案例分析与沉降分析方法[J].土木工程学报,2012(1):134.
[14] 韩煊,李宁,JAMIE R.地铁隧道施工引起地层位移规律的探讨[J].岩土力学,2007,28(3):609.
[15] 王剑晨,张项立,张成平,等.浅埋暗挖隧道近距施工引起的上覆地铁结构变形分析[J].岩石力学与工程学报,2014,33(1):90.