Soil disturbance induced by shield advancing through a small radius path
PAN Hong1，2，SU Wenyuan1，3，ZHAI Guolin4，CAO Hong1，2，LUO Guanyong1，2
(1. School of Civil Engineering and Transportation，South China University of Technology，Guangzhou，Guangdong 510640，China；
2. State Key Laboratory of Subtropical Building Science，South China University of Technology，Guangzhou，Guangdong 510640，China；3. Guangzhou Municipal Engineering Design and Research Institute，Guangzhou，Guangdong 510060，China；4. Guangzhou Metro Company，Guangzhou，Guangdong 510330，China)
Abstract：To avoid the disturbing to the existing underground structures，shield advancing along a path with a small radius of curvature is sometimes inevitable. In this paper，the site observation data，the vertical and horizontal deformation and the pore water pressure of soils around the tunnel，were presented and analyzed when a shield advancing through a path with the radius of curvature being 118 m. It was found that the soil deformation mode was very different from those observed in the case of straight path. The soil around the tunnel on the outside of the curve was squeezed and moved upward and the horizontal displacement of soil around the tunnel consists of two parts. One part was induced by the squeezing effect，which was similar to that induced by shield advancing through a straight path，and the other part was from the turning action. The second part is nonsymmetrical. The soil on the outside of the curve moved away from the tunnel and the soil on the inside moved towards the center of the tunnel. The superimposition of the deformation increased the risk and should be paid more attention.
[1] 贾 勇. 盾构施工地层变形实测与三维数值模拟及参数分析[博士学位论文][D]. 天津：天津大学，2010.(JIA Yong. Ground deformation measurement and three-dimensional numerical simulation and parametric analysis by shield driven[Ph. D. Thesis][D]. Tianjin：Tianjin University，2010.(in Chinese))
[2] 姜忻良，崔 奕，李 园，等. 天津地铁盾构施工地层变形实测及动态模拟[J]. 岩土力学，2005，26(10)：1 612–1 616.(JIANG Xiliang，CUI Yi，LI Yuan，et al. Measurement and simulation of ground settlements of Tianjin subway shield tunnel construction[J]. Rock and Soil Mechanics，2005，26(10)：1 612–1 616.(in Chinese))
[3] DIAS D，KASTNER R. Movements caused by the excavation of tunnels using face pressurized shields—Analysis of monitoring and numerical modeling results[J]. Engineering Geology，2013，152(2)：17–25.
[4] CHEN R P，ZHU J，LIU W，et al. Ground movement induced by parallel EPB tunnels in silty soils[J]. Tunnelling and Underground Space Technology，2011，26(1)：163–171.
[5] SUN Y，XU Y S，SHEN S L，et al. Field performance of underground structures during shield tunnel construction[J]. Tunnelling and Underground Space Technology，2012；28：272–277.
[6] 王占生，王梦恕，张 弥. 盾构隧道施工引起地表下土体变位的分析评估[J]. 岩土力学，2009，27(6)：1 699–1704.(WANG Zhansheng，WANG Mengshu，ZHANG Mi. Methods for estimating subsurface ground movements induced by shield tunneling[J]. Rock and Soil Mechanics，2009，27(6)：1 699–1 704.(in Chinese))
[7] MAIR R J，TAYLOR R N，BRACEGIRDLE A. Subsurface settlement profiles above tunnels in clays[J]. Geotechnique，1993，43(2)：315–320.
[8] 魏 纲. 盾构法隧道施工引起的土体变形预测[J]. 岩石力学与工程学报，2009，28(2)：418–424.(WEI Gang. Prediction of ground deformation induced by shield tunneling construction[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(2)：418–424.(in Chinese))
[9] 梁荣柱，夏唐代，林存刚，等. 盾构推进引起地表变形及深层土体水平位移分析[J]. 岩石力学与工程学报，2015，34(3)：583–593.(LIANG Rongzhu，XIA Tangdai，LIN Cungang，et al. Analysis of ground surface displacement and horizontal movement of deep soils induced by shield advancing[J]. Chinese Journal of Rock Mechanics and Engineering，2015，34(3)：583–593.(in Chinese))
[10] 徐永福，陈建山，傅德明. 盾构掘进对周围土体力学性质的影响[J]. 岩石力学与工程学报，2003，22(7)：1 174–1 179.(XU Yongfu，CHEN Jianshan，FU Deming. Effect of shield tunneling on mechanical properties of soils[J]. Chinese Journal of Rock Mechanics and Engineering，2003，22(7)：1 174–1 179.(in Chinese))
[11] 蒋洪胜，侯学渊. 盾构掘进对隧道周围土层扰动的理论与实测分 析[J]. 岩石力学与工程学报，2003，22(9)：1 514–1 520.(JIANG Hongsheng，HOU Xueyuan. Theoretical study and analysis of site observation on the influence of shield excavation on soft clays around tunnel[J]. Chinese Journal of Rock Mechanics and Engineering，2003，22(9)：1 514–1 520.(in Chinese))
[12] 徐 辉. 铰接式盾构机的铰接与仿形刀应用[J]. 地下工程与隧道，2003，(2)：41–44.(XU Hui. Application of articulation and copying tool in articulated shield[J]. Underground Engineering and Tunnels，2003，(2)：41–44.(in Chinese))
[13] 陈大囡，郑学峰. 小曲率半径隧道盾构推进的轴线控制[J]. 城市道桥与防洪，2009，(5)：132–133.(CHEN Danan，ZHENG Xuefeng. Axis control of shield driving in small curvature radius of tunnel[J]. Urban Roads Bridges and Flood Control，2009，(5)：132–133.(in Chinese))
[14] 黄雪梅，钱 新. 小半径盾构隧道下穿多轨道铁路风险源的研究[J]. 地下工程与隧道，2010，(3)：115–119.(HUANG Xuemei，QIAN Xin. Research of risk sources of shield tunneling in small radius for traversing below multitrack[J]. Underground Engineering and Tunnels，2010，(3)：115–119.(in Chinese))
[15] LEE K M，JI H W，SHEN C K，et al. Ground response to the construction of Shanghai metro tunnel-line 2[J]. Soils and Foundation，1999，39(3)：113–134.
[16] 唐晓武，朱 季，刘 维，等. 盾构施工过程中的土体变形研究[J]. 岩石力学与工程学报，2010，29(2)：417–422.(TANG Xiaowu，ZHU Ji，LIU Wei，et al. Research on soil deformation during shield construction process[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(2)：417–422.(in Chinese))
2017, Vol. 36 
