大型地下结构下修建盾构隧道模型试验
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摘要
采用三维相似模型试验,研究了在南京玄武湖公路隧道下新建地铁盾构隧道时,两重叠隧道间的相互影响.试验结果表明:盾构隧道施工对玄武湖隧道周围土体的扰动十分有限,不会产生因下方土体变形过大导致玄武湖隧道出现“漂移”现象;对玄武湖隧道下方土体进行加固和加设抗拔桩后,结构附加内力和变形值明显减小;地表下沉很小,不会造成路面结构破坏.最后,用有限元计算进行了对比分析,表明盾构隧道施工中,玄武湖隧道和盾构隧道是安全的,不需进行特殊处理.
A 3D model test was carried out to investigate the interference when a metro tunnel is
excavated with the shield method under an existing underground structure, the Xuanwuhu tunnel in
Nanjing City. The experimental results showthatthe construction of the shield tunnel has a slighteffect
on the Xuanwuhu tunnel is and large deformation to lead to the“excursion”of the Xuanwuhu tunnel
does not occur. Under the conditions of setting uplife piles and reinforcing the ground below the
Xuanwuhu tunnel, the additional deformations and internal forces are obviously reduced. In addition,
the settlement of ground is small, so pavement structures can not be destroyed. Finally, to compare
with the experimental result FEM(finite element method) was used. The numerical simulation result
shows that both the Xuanwuhu tunnel and the shield tunnel are safe during the construction of the
shield tunnel, and special measures are needed.
A 3D model test was carried out to investigate the interference when a metro tunnel is
excavated with the shield method under an existing underground structure, the Xuanwuhu tunnel in
Nanjing City. The experimental results showthatthe construction of the shield tunnel has a slighteffect
on the Xuanwuhu tunnel is and large deformation to lead to the“excursion”of the Xuanwuhu tunnel
does not occur. Under the conditions of setting uplife piles and reinforcing the ground below the
Xuanwuhu tunnel, the additional deformations and internal forces are obviously reduced. In addition,
the settlement of ground is small, so pavement structures can not be destroyed. Finally, to compare
with the experimental result FEM(finite element method) was used. The numerical simulation result
shows that both the Xuanwuhu tunnel and the shield tunnel are safe during the construction of the
shield tunnel, and special measures are needed.
引文
①李围,何川.南京地铁区间盾构隧道下穿玄武湖隧道试验研究报告.成都:西南交通大学,2002.
[1]张志强,何川.地铁盾构隧道近接桩基的施工力学行为研究[ J].铁道学报,2003,25(1):92-95.Zhang Z Q, He C. Research on m echan ics behaviour of a sh ield tunnel construction in m etro ad jacent to existing p ilefoundation[ J]. Journal of the Ch ina Railway Soc iety,2003,25(1):92-95.
[2]刘广钧.如何解决重叠隧道施工中的技术难题[ J].铁道建筑技术,2002(6):38-41.L iu G J. Techn ical d ifficu lties encountered in construction of overlapped tunnels and counterm easures [ J ]. RailwayConstruction Technology,2002(6):38-41.
[3] Yam aguch i I Y, K iritan i Y. Study of ground tunnel interactions of four sh ield tunnels driven in c lose proxim ity [ J].Tunnelling and Underground Space Technology,1998,13(3):289-304.
[4]夏才初,李永盛.地下工程测试理论与监测技术[M ].上海:同济大学出版社,1999.94-105.
[5]何川.シ-ルドトンネル縱断方向の地震舉動に関する研究[D ].东京:早稻田大学专业理工学部,1999.
[1]张志强,何川.地铁盾构隧道近接桩基的施工力学行为研究[ J].铁道学报,2003,25(1):92-95.Zhang Z Q, He C. Research on m echan ics behaviour of a sh ield tunnel construction in m etro ad jacent to existing p ilefoundation[ J]. Journal of the Ch ina Railway Soc iety,2003,25(1):92-95.
[2]刘广钧.如何解决重叠隧道施工中的技术难题[ J].铁道建筑技术,2002(6):38-41.L iu G J. Techn ical d ifficu lties encountered in construction of overlapped tunnels and counterm easures [ J ]. RailwayConstruction Technology,2002(6):38-41.
[3] Yam aguch i I Y, K iritan i Y. Study of ground tunnel interactions of four sh ield tunnels driven in c lose proxim ity [ J].Tunnelling and Underground Space Technology,1998,13(3):289-304.
[4]夏才初,李永盛.地下工程测试理论与监测技术[M ].上海:同济大学出版社,1999.94-105.
[5]何川.シ-ルドトンネル縱断方向の地震舉動に関する研究[D ].东京:早稻田大学专业理工学部,1999.