双线地铁隧道泥水及土压平衡盾构施工地层变形特征研究
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摘要
为分析圆砾地层双线地铁隧道分别采用泥水和土压平衡盾构施工时的地层变形特征,以南宁地铁3号线东葛路站—滨湖路站区间盾构施工工程为背景,采用现场监测数据分析2种盾构施工时的地表横向沉降特征和监测点纵向沉降历程特征。利用FLAC3D软件对2种盾构工法进行简化模拟,验证模拟方法的可行性;设计双线地铁隧道分别采用土压平衡盾构和泥水平衡盾构、全部采用泥水平衡盾构、全部采用土压平衡盾构3种工况的模拟方案,研究3种工况下的地层变形特征。研究结果表明:1)双线地铁隧道采用2种类型盾构施工时,地层沉降曲线偏向土压平衡盾构施工的隧道一侧;采用同种类型盾构施工时,地层距离隧道越近,沉降曲线呈"W"特征越明显; 2)双线地铁隧道采用土压平衡盾构施工时各地层沉降较大,地表横向沉降影响范围约50 m;采用泥水平衡盾构施工时各地层沉降相对较小,地表横向沉降影响范围约30 m; 3) 3种工况下,双线地铁隧道采用土压平衡盾构施工时引起的地表水平位移最大。
The horizontal ground settlement characteristics and longitudinal settlement characteristics of monitoring point of Donggelu Station-Binhulu Station shield tunnel on Nanning Metro Line No.3 bored by slurry balance shield and EPB shield are analyzed by field monitoring data.The software FLAC3D is used to simplify the simulation of the two shield construction methods,and the monitoring results are used to verify the feasibility of the simulation method.Three working conditions,tunnels bored by slurry balance shield and EPB shield respectively,tunnels bored by slurry balance shield and those bored by EPB shield,are designed and simulated,and corresponding ground deformation characteristics are studied.The study results show that:(1) When the tunnels are bored by slurry balance shield and EPB shield respectively,the ground settlement curve is biased towards the side of the tunnel bored by EPB shield;when the tunnels are bored by slurry/EPB shield,the closer the ground to the tunnel,more obvious the "W"-shape of the settlement curve presents.(2) When the tunnels are bored by EPB shield,the ground settlement is large,and the influencing range of surface settlement is about 50 m;however,when the tunnels are bored by slurry balance shield,the ground settlement is relevant small,and the influencing range of surface settlement is about 30 m.(3) The horizontal surface displacement is the largest when the tunnels are bored by EPB shield.
The horizontal ground settlement characteristics and longitudinal settlement characteristics of monitoring point of Donggelu Station-Binhulu Station shield tunnel on Nanning Metro Line No.3 bored by slurry balance shield and EPB shield are analyzed by field monitoring data.The software FLAC3D is used to simplify the simulation of the two shield construction methods,and the monitoring results are used to verify the feasibility of the simulation method.Three working conditions,tunnels bored by slurry balance shield and EPB shield respectively,tunnels bored by slurry balance shield and those bored by EPB shield,are designed and simulated,and corresponding ground deformation characteristics are studied.The study results show that:(1) When the tunnels are bored by slurry balance shield and EPB shield respectively,the ground settlement curve is biased towards the side of the tunnel bored by EPB shield;when the tunnels are bored by slurry/EPB shield,the closer the ground to the tunnel,more obvious the "W"-shape of the settlement curve presents.(2) When the tunnels are bored by EPB shield,the ground settlement is large,and the influencing range of surface settlement is about 50 m;however,when the tunnels are bored by slurry balance shield,the ground settlement is relevant small,and the influencing range of surface settlement is about 30 m.(3) The horizontal surface displacement is the largest when the tunnels are bored by EPB shield.
引文
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[12]王国富,王建,路林海,等.富水大粒径砂卵石地层盾构施工适应性研究[J].施工技术,2017,46(19):88.WANG Guofu,WANG Jian,LU Linhai,et al.Adaptability research of shield construction in the stratum full of water and large particle cobble[J].Construction Technology,2017,46(19):88.
[2]施成华,彭立敏,雷明锋.盾构法施工隧道地层变形时空统一预测方法研究[J].岩土力学,2009,30(8):2379.SHI Chenghua,PENG Limin,LEI Mingfeng.Study of timespace united calculating method of stratum deformation caused by shield tunnel excavation[J].Rock and Soil Mechanics,2009,30(8):2379.
[3]王鹏,周传波,刘亚辉,等.武汉地铁三号线土层盾构开挖引起的地表沉降研究[J].水文地质工程地质,2015,42(1):75.WANG Peng,ZHOU Chuanbo,LIU Yahui,et al.A study of land subsidence in the subway shield tunnel excavation in soil strata in Wuhan[J].Hydrogeology&Engineering Geology,2015,42(1):75.
[4]王国才,马达君,杨阳,等.软土地层中地铁盾构施工引起地表沉降的三维有限元分析[J].岩土工程学报,2011,33(增刊1):266.WANG Guocai,MA Dajun,YANG Yang,et al.3-D finite element analysis of ground settlement caused by shield construction of metro tunnels in soft soils[J].Chinese Journal of Geotechnical Engineering,2011,33(S1):266.
[5]魏新江,周洋,魏纲.土压平衡盾构掘进参数关系及其对地层位移影响的试验研究[J].岩土力学,2013,34(1):73.WEI Xinjiang,ZHOU Yang,WEI Gang.Research of EPBshield tunneling parameter relations and their influence on stratum displacement[J].Rock and Soil Mechanics,2013,34(1):73.
[6]姜忻良,李林,袁杰,等.深层地铁盾构施工地层水平位移动态分析[J].岩土力学,2011,32(4):1186.JIANG Xinliang,LI Lin,YUAN Jie,et al.Dynamic analysis of strata horizontal displacements induced by shield construction of deep tunnel[J].Rock and Soil Mechanics,2011,32(4):1186.
[7]王忠昶,王海涛,朱训国,等.地铁盾构双隧道施工诱发的地层变形规律分析[J].中国铁道科学,2013,34(3):53.WANG Zhongchang,WANG Haitao,ZHU Xunguo,et al.Analysis of stratum deformation rules induced by the construction of double-tube parallel shield tunnels for metro[J].China Railway Science,2013,34(3):53.
[8]蒋胜光,张子新.圆砾地层双线盾构施工参数及沉降特征分析[J].地下空间与工程学报,2015,11(增刊2):698.JIANG Shengguang,ZHANG Zixin.Analysis of boring parameters and ground settlement characteristics during double-line tunneling in circular-gravel layer[J].Chinese Journal of Underground Space and Engineering,2015,11(S2):698.
[9]林存刚,张忠苗,吴世明,等.泥水平衡盾构掘进参数对地面沉降影响实例研究[J].土木工程学报,2012,45(4):116.LIN Cungang,ZHANG Zhongmiao,WU Shiming,et al.Case study of slurry shield driving parameters'influence on ground surface settlements[J].Chinese Civil Engineering Journal,2012,45(4):116.
[10]李承辉,贺少辉,刘夏冰.粗粒径砂卵石地层中泥水平衡盾构下穿黄河掘进参数控制研究[J].土木工程学报,2017,50(增刊2):147.LI Chenghui,HE Shaohui,LIU Xiabing.Study of main parameters control of tunneling through the yellow river by a slurry balance shield in sandy gravel stratum with some large-size grains[J].Chinese Civil Engineering Journal,2017,50(S2):147.
[11]杨晓华.砂卵石地层中复合式土压平衡盾构掘进参数及地层变形规律研究[J].隧道建设,2014,34(8):721.YANG Xiaohua.Study of boring parameters of composite EPB shield in sandy cobble strata and study of ground deformation rule[J].Tunnel Construction,2014,34(8):721.
[12]王国富,王建,路林海,等.富水大粒径砂卵石地层盾构施工适应性研究[J].施工技术,2017,46(19):88.WANG Guofu,WANG Jian,LU Linhai,et al.Adaptability research of shield construction in the stratum full of water and large particle cobble[J].Construction Technology,2017,46(19):88.