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Analysis of deformation of existing tunnel overlapped by new shield tunnel
Received date: 2015-03-17
Online published: 2016-12-30
As the newly-built Metro Line 11 in Shanghai went through Line 4, a method of data monitoring was used to analyze the deformation of the existing tunnel overlapped by Line 11 under construction with lower- and upper-shields. Cubic spline interpolation was used to simulate the deformation curve. A deformation curve of the full-length profile of the cross section was obtained. Based on an improved longitudinal equivalent continuous model of the tunnel, the relationship between the tunnel’s longitudinal deformation curve and the amount of stretching of the circular seam was calculated. Combined with the specifications, control indicators of deformation for the existing tunnel caused by Line 11 were proposed. The results showed that the maximum deformation in excavation engineering should be controlled first when the lower-shield was constructed, and then the upper-shield. At the same time, deformation of the inside and outside circle should be concentrated in its centerline around 2.5 times the outer diameter of the shield tunnel. In constructing the lower part, subsidence in the outer circle was larger because the outer circle was more influenced and the pre-disturbance was mainly concentrated in the outer center region. The results provided a theoretical basis for constructing overlapped metro lines, especially for protecting an existing tunnel when the lower-shield was constructed first.
CAI Weiyang1, ZHANG Mengxi1, WU Huiming2 . Analysis of deformation of existing tunnel overlapped by new shield tunnel[J]. Journal of Shanghai University, 2016 , 22(6) : 813 -820 . DOI: 10.3969/j.issn.1007-2861.2015.02.021
[1] 贾颖绚, 刘维宁, 孙晓静. 三维交叠隧道列车运营对环境的振动影响[J]. 铁道学报, 2009, 31(2): 104-109.
[2] Hansmire W H, Parker H W, Ghaboussi J, et al. Effects of shield tunneling over subways [C]// Proceeding of 3rd Rapid Excavation and Tunneling Conference. 1981: 254-276.
[3] Yamaguchi I, Yamazaki I, Kiritanl Y. Study of ground-tunnel interactions of four shield tunnels driven in close proximity, in relation to design and construction of parallel shield tunnels [J]. Tunnelling and Underground Space Technology, 1998, 13(3): 289-304.
[4] 朱蕾, 黄宏伟. 盾构近距离上穿运营隧道的实测数据分析[J]. 浙江大学学报(工学版), 2010, 44(10): 1962-1966.
[5] 陶连金, 孙斌, 李晓霖. 超近距离双孔并行盾构施工的相互影响分析[J]. 岩石力学与工程学报, 2009, 28(9): 1856-1862.
[6] Suwansawat S, Einstein H H. Describing settlement troughs over twin tunnels using a superposition technique [J]. Journal of Geotechnical and Geoenvironmental Engineering, 2007, 133(4): 445-468.
[7] 白廷辉, 尤旭东, 李文勇. 盾构超近距离穿越地铁运营隧道的保护技术[J]. 地下空间, 1999, 19(4): 311-316.
[8] 刘树佳, 张孟喜. 新建盾构隧道上穿对既有隧道的变形影响分析[J]. 岩土力学, 2013, 34(1): 399-405.
[9] 王有成, 张孟喜, 李磊. 软土盾构不同穿越形式对既有隧道扰动影响分析[J]. 上海大学学报(自然科学版), 2014, 20(5): 573-584.
[10] 廖少明, 杨俊龙, 奚程磊. 盾构近距离穿越施工的工作面土压力研究[J]. 岩土力学, 2005, 26(11): 1727-1730.
[11] 李磊, 张孟喜, 吴惠明. 近距离多线叠交盾构施工对既有隧道变形的影响研究[J]. 岩土工程学报, 2014, 36(6): 1036-1043.
[12] 肖劲松, 王沫然. Matlab 5X 与科学计算[M]. 北京: 清华大学出版社, 2000: 139-140.
[13] Chen B, Wen Z Y. Elastoplastic analysis for the effect of longitudinal uneven settlement [C]//Proceedings of the ITA World Tunnelling Congress 2003. 2003: 969-974.
[14] 志波由纪夫, 川岛一彦. 答变位法によろシールドトソホルの地震时断面力の算定法[C]// 土木学会论文集. 1988: 385-394.
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