盾构隧道埋深对临近铁路桥梁的影响分析
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摘要
为研究盾构隧道下穿临近铁路桥梁过程中隧道埋深对既有桥梁沉降变形及水平位移变化的影响,以武汉地铁3号线区间盾构穿越铁路桥梁工程为依托,利用有限元软件ANSYS对不同隧道埋深(2D、2.5D、3D(D为隧道直径))下桥梁的梁体结构、轨道线路及桩基位移等进行对比分析,并结合现场数据进行验证。研究结果表明:1)随着隧道埋深的增大会引起桩基、梁体及钢轨等结构竖向位移的增大,当隧道埋深为18 m时,墩台最大沉降超过了限制值;2)隧道埋深分别为12、15、18 m时,桥梁墩台及梁体结构均表现出以沉降为主的变形,而水平位移变化幅度较小;3)在满足地表沉降限值的条件下可适当减少隧道埋深,以控制隧道开挖引起的上部桥梁、钢轨等结构物变形。
Taking the construction of the shield tunnel crossing railway bridge of Wuhan Metro Line 3 as an example,the displacement of the beam structure,track line and pile bridges under different burial depths( 2 D,2. 5 D,3 D) are analyzed with the finite element software ANSYS and then being validated with the field data to study the effect of tunnel buried depth on the settlement deformation and horizontal displacement of existing bridges during the process of shield tunnels passing through adjacent railway bridges. The results showed that:( 1) Increasing the depth of tunnel will increase the vertical displacement of pile foundation,beam and rail structure,and when the depth of the tunnel is 18 m,the maximum settlement of the pier exceeds the limit value;( 2) When the tunnel burial depths are 12 m,15 m and 18 m,the deformations of piers and beam structures are mainly vertical displacements,while horizontal displacements are smaller;( 3) When the surface subsidence limit is met,the deformation of the upper bridges,rails,and other structures caused by the tunnel excavation is controlled by appropriately reducing the tunnel burial depth.
Taking the construction of the shield tunnel crossing railway bridge of Wuhan Metro Line 3 as an example,the displacement of the beam structure,track line and pile bridges under different burial depths( 2 D,2. 5 D,3 D) are analyzed with the finite element software ANSYS and then being validated with the field data to study the effect of tunnel buried depth on the settlement deformation and horizontal displacement of existing bridges during the process of shield tunnels passing through adjacent railway bridges. The results showed that:( 1) Increasing the depth of tunnel will increase the vertical displacement of pile foundation,beam and rail structure,and when the depth of the tunnel is 18 m,the maximum settlement of the pier exceeds the limit value;( 2) When the tunnel burial depths are 12 m,15 m and 18 m,the deformations of piers and beam structures are mainly vertical displacements,while horizontal displacements are smaller;( 3) When the surface subsidence limit is met,the deformation of the upper bridges,rails,and other structures caused by the tunnel excavation is controlled by appropriately reducing the tunnel burial depth.
引文
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[2]LEE G T K,NG C W W.Effects of advancing open face tunneling on an existing loaded pile[J].Journal of Geotechnical and Geoenvironmental Engineering,2005,131(2):193.
[3]LEE C J,JACOBSZ S W.The influence of tunneling on adjacent piled foundations[J].Tunneling and Underground Space Technology,2006,21:430.
[4]王述红,赵贺兴,姜磊,等.基于两阶段法地铁盾构开挖对邻近桩基影响分析[J].东北大学学报(自然科学版),2014(6):871.WANG Shuhong,ZHAO Hexing,JIANG Lei,et al.Analysis of the impact on adjacent pile caused by excavation with metro shield based on two-stage method[J].Journal of Northeastern University(Natural Science),2014(6):871.
[5]CHEN L T,POULOS H G.Pile responses caused by tunneling[J].Journal of Geotechnical and Geoenvironmental Engineering,1999,125(3):207.
[6]LOGANATHAN N,POULOS H G,STEWART D P.Centrifuge model testing of tunneling-induced ground and pile deformations[J].Geotechnique,2000,50(3):283.
[7]JACOBSZ S W,STANDING J R,MAIR R J,et al.Centrifuge modeling of tunneling near driven piles[C]//Proc.of the 3rd int.symp.on Geotechnical Aspects of Underground Construction in Soft Ground.Toulouse:[s.n.],2002:89.
[8]王立峰.盾构施工对桩基的影响及桩基近邻度划分[J].岩土力学,2014(增刊2):319.WANG Lifeng.Shield construction influences on piles and classification of adjacent pile degree[J].Rock and Soil Mechanics,2014(S2):319.
[9]MAIR R J.Developments in geotechnical engineering research:Application to tunnels and deep excavations[C]//Proceedings of Institution of Civil Engineers,Civil Engineering.London:[s.n.],1 9 9 3:2 7.
[10]李旺旺,韦宏鹄.北京昌平线二期地铁盾构侧穿桥梁沉降监测分析[J].隧道建设,2015(2):139.LI Wangwang,WEI Honghu.Analysis on settlement of bridge caused by side crossing of shield case study on shield tunneling of phase 2 of Changping Line of Beijing Metro[J].Tunnel Construction,2015(2):139.
[11]徐源,董志高.地铁隧道下穿既有高铁桥梁基础的变形控制[J].现代交通技术,2014,11(1):26XU Yuan,DONG Zhigao.Foundation deformation control of shield tunnel under-pass existing high speed railway[J].Modern Transportation Technology,2014,11(1):26.
[12]贾广武.盾构隧道下穿川陕立交施工技术研究[J].隧道建设,2014,34(8):778JIA Guangwu.Construction technologies for shield-bored tunnel crossing underneath Chuanshan interchange[J].Tunnel Construction,2014,34(8):778.
[13]黄新民.盾构隧道下穿既有桥桩工程的保护方案研究[J].地下空间与工程学报,2012,8(3):557.HUANG Xinmin.Study of protection scheme for shield tunnel construction beneath bridge's pile foundation[J].Chinese Journal of Underground Space and Engineering,2012,8(3):557.
[14]倪安斌.泥炭(质)土地层中盾构法施工对邻近桥梁的影响分析[J].现代隧道技术,2014,51(3):168.NI Anbin.Analysis of the influence of shield tunneling in cumulosol strata on adjacent bridges[J].Modern Tunnelling Technology,2014,51(3):168.
[15]周济民.盾构区间隧道下穿高架桥桩基群施工技术与环境影响预测[J].现代隧道技术,2016,53(1):165.ZHOU Jimin.Construction technology and environmental impact prediction for a shield tunnel under a viaduct pile foundation group[J].Modern Tunnelling Technology,2016,53(1):165.