深基坑隔离桩对坑外既有隧道保护效果分析
|
摘要
依托南昌市某深基坑开挖时采用隔离桩保护临近既有地铁隧道工程,采用ABAQUS有限元数值建模并结合实测数据,研究隔离桩在基坑开挖时对坑外既有地铁隧道的保护效果。通过建立多组有限元模型,研究基坑开挖时隔离桩在不同水平位置和不同桩顶埋深条件下既有隧道衬砌内力、直径变形情况。研究结果表明:隔离桩水平位置对隧道衬砌的内力影响较为明显,隔离桩离隧道越近,隔离桩对既有隧道的保护效果越好;设置隔离桩能明显减小既有隧道衬砌的变形,且隔离桩对其竖向变形影响小于对其水平变形的影响;埋入式隔离桩隔离效果在一定程度上优于非埋入式隔离桩,在实际工程中可以采用埋入式隔离桩,适当减小桩身长度,降低工程造价。
The isolated pile technique was adopted in a practical foundation project in Nanchang. Based on this project,numerical modeling simulations built with ABAQUS were combined with the observed data to study the protection effect of isolated piles on adjacent subway tunnel when the foundation pit was proceeded. The influences of horizontal location as well as buried depth of the isolated piles on internal stress and diameter variation of lining in existing tunnel during excavation were studied,based on the analysis on several sets of numerical models. A significant influence of the horizontal location on internal stress of the lining has been observed,a shorten gap of the isolated piles to the tunnel implied an improved protection effect. In addition,the deformation of the lining could be greatly suppressed by setting the isolated piles and more prominent effect on horizontal deformation compared with that on vertical direction. A further analysis indicated that the buried isolated piles performed better than the exposed ones. In general,the buried isolated piles with shortened pile length could be used in practical engineering to reduce the project cost.
The isolated pile technique was adopted in a practical foundation project in Nanchang. Based on this project,numerical modeling simulations built with ABAQUS were combined with the observed data to study the protection effect of isolated piles on adjacent subway tunnel when the foundation pit was proceeded. The influences of horizontal location as well as buried depth of the isolated piles on internal stress and diameter variation of lining in existing tunnel during excavation were studied,based on the analysis on several sets of numerical models. A significant influence of the horizontal location on internal stress of the lining has been observed,a shorten gap of the isolated piles to the tunnel implied an improved protection effect. In addition,the deformation of the lining could be greatly suppressed by setting the isolated piles and more prominent effect on horizontal deformation compared with that on vertical direction. A further analysis indicated that the buried isolated piles performed better than the exposed ones. In general,the buried isolated piles with shortened pile length could be used in practical engineering to reduce the project cost.
引文
[1]CHANG C T,WANG M J,CHANG C T,et al.Repair of displaced shield tunnel of the Taipei rapid transit system[J].Tunnelling&Underground Space Technology Incorporating Trenchless Technology Research,2001,16(3):167-173.
[2]CHANGC T,SUN C W,DUANN S W,et al.Response of a Taipei rapid transit system(TRTS)tunnel to adjacent excavation[J].Tunnelling and Underground Space Technology,2001,16(3):151-158.
[3]李大勇,龚晓南,张土乔.软土地基深基坑周围地下管线保护措施的数值模拟[J].岩土工程学报,2001,23(6):736-740.LI Dayong,GONG Xiaonan,ZHANG Tuqiao.Numerical simulation of the buried pipelines protection adjacent to deep excavation[J].Chinese Journal of Geotechnical Engineering,2001,23(6):736-740.
[4]欧章煜,谢百钩.深开挖邻产保护之探讨[J].岩土工程学报,2008,30(增刊1):509-517.OU Zhangyu,XIE Baigou.Building protection measures in deep excavations[J].Chinese Journal of Geotechnical Engineering,2008,30(Suppl.1):509-517.
[5]雷永生.西安地铁二号线下穿城墙及钟楼保护措施研究[J].岩土力学,2010,31(1):223-236.LEI Yongsheng.Research on protective measure of city w all and bell tow er due to underneath crossing Xi'an metro line No.2[J].Rock and Soil M echanics,2010,31(1):223-236.
[6]苏维捷,屠传豹.基坑开挖下隔离桩受力变形的解析研究[J].低温建筑技术,2014,36(6):105-107SU Weijie,TU Chuanbao.Analytical study on the deformation of the isolation pile under foundation pit excavation[J].Low Temperature Building Technology,2014,36(6):105-107.
[7]BILOTTA E.Use of diaphragm walls to mitigate ground movements induced by tunnelling[J].Géotechnique,2008,58(2):143-155.
[8]李雪,周顺华,王培鑫,等.隔离桩及盾构近接施工对高铁桩基的影响分析[J].岩土力学,2015,36(增刊1):235-240.LI Xue,ZHOU Shunhua,WANG Peixin,et al.Analysis of the influence of isolation pile and shield construction on high-speed rail pile foundation[J].Rock and Soil M echanics,2015,36(Suppl.1):235-240.
[9]应宏伟,李涛,杨永文,等.深基坑隔断墙保护邻近建筑物的效果与工程应用分析[J].岩土工程学报,2011,33(7):1123-1128.YING Hongw ei,LI Tao,YANG Yongw en,et al.Effect and application w alls in protecting adjacent buildings from deep foundation pits[J].Chinese Journal of Geotechnical Engineering,2011,33(7):1123-1128.
[10]郑刚,杜一鸣,刁钰.隔离桩对基坑外既有隧道变形控制的优化分析[J].岩石力学与工程学报,2015,34(增刊1):3499-3509.ZHENG Gang,Du Yiming,DIAO Yu.Optimization analysis of existing pile deformation control of existing piles outside the foundation pit[J].Journal of Rock Mechanics and Engineering,2015,34(Suppl.1):3499-3509.
[11]曾晓鑫,丁文湘,彭玲,等.隔离桩间距对基坑开挖引起地铁隧道的位移影响分析[J].中国科技论文,2018,13(1):17-22.ZENG Xiaoxin,DING Wenxiang,PENG Ling,et al.A-nalysis of the influence of the spacing of the isolation piles on the displacement of the subw ay tunnel caused by the excavation of the foundation pit[J].Chinese Science and Technology Paper,2018,13(1):17-22.
[12]曾晓鑫,丁文湘,彭玲,等.隔离桩桩径对基坑开挖引起既有地铁隧道位移的影响[J].铁道建筑,2017(6):95-97.ZENG Xiaoxin,DING Wenxiang,PENG Ling,et al.Influence of isolated pile diameter on excavation of existing subw ay tunnel caused by foundation pit excavation[J].Railway Construction,2017(6):95-97.
[13]曾晓鑫,丁文湘,彭玲,等.深基坑开挖时隔离桩位置对邻近既有地铁隧道的变形分析[J].科学技术与工程,2017,17(14):296-301.ZENG Xiaoxin,DING Wenxiang,PENG Ling,et al.Deformation analysis of the location of isolation piles in the excavation of deep foundation pits adjacent to existing metro tunnels[J].Science and Technology and Engineering,2017,17(14):296-301.
[14]DONG Y P,BURD H J,HOULSBY G T.Finite element parametric study of the performance of a deep excavation[J].Soils and Foundations,2018,58(3):729-743.
[15]王金昌,陈页开.ABAQUS在土木工程中的应用[M].杭州:浙江大学出版社,2006.
[16]徐中华,王卫东.敏感环境下基坑数值分析中土体本构模型的选择[J].岩土力学,2010,31(1):258-264.XU Zhong hua,WANG Wei dong.Selection of soil constitutive models for numerical analysis of deep excavations in close proximity to sensitive properties[J].Rock and Soil M echanics,2010,31(1):258-264.
[17]LIU C,ZHANG Z,REGUEIRO R A.Pile and pile group response to tunnelling using a large diameter slurry shield-Case study in Shanghai[J].Computers&Geotechnics,2014,59(59):21-43.
[2]CHANGC T,SUN C W,DUANN S W,et al.Response of a Taipei rapid transit system(TRTS)tunnel to adjacent excavation[J].Tunnelling and Underground Space Technology,2001,16(3):151-158.
[3]李大勇,龚晓南,张土乔.软土地基深基坑周围地下管线保护措施的数值模拟[J].岩土工程学报,2001,23(6):736-740.LI Dayong,GONG Xiaonan,ZHANG Tuqiao.Numerical simulation of the buried pipelines protection adjacent to deep excavation[J].Chinese Journal of Geotechnical Engineering,2001,23(6):736-740.
[4]欧章煜,谢百钩.深开挖邻产保护之探讨[J].岩土工程学报,2008,30(增刊1):509-517.OU Zhangyu,XIE Baigou.Building protection measures in deep excavations[J].Chinese Journal of Geotechnical Engineering,2008,30(Suppl.1):509-517.
[5]雷永生.西安地铁二号线下穿城墙及钟楼保护措施研究[J].岩土力学,2010,31(1):223-236.LEI Yongsheng.Research on protective measure of city w all and bell tow er due to underneath crossing Xi'an metro line No.2[J].Rock and Soil M echanics,2010,31(1):223-236.
[6]苏维捷,屠传豹.基坑开挖下隔离桩受力变形的解析研究[J].低温建筑技术,2014,36(6):105-107SU Weijie,TU Chuanbao.Analytical study on the deformation of the isolation pile under foundation pit excavation[J].Low Temperature Building Technology,2014,36(6):105-107.
[7]BILOTTA E.Use of diaphragm walls to mitigate ground movements induced by tunnelling[J].Géotechnique,2008,58(2):143-155.
[8]李雪,周顺华,王培鑫,等.隔离桩及盾构近接施工对高铁桩基的影响分析[J].岩土力学,2015,36(增刊1):235-240.LI Xue,ZHOU Shunhua,WANG Peixin,et al.Analysis of the influence of isolation pile and shield construction on high-speed rail pile foundation[J].Rock and Soil M echanics,2015,36(Suppl.1):235-240.
[9]应宏伟,李涛,杨永文,等.深基坑隔断墙保护邻近建筑物的效果与工程应用分析[J].岩土工程学报,2011,33(7):1123-1128.YING Hongw ei,LI Tao,YANG Yongw en,et al.Effect and application w alls in protecting adjacent buildings from deep foundation pits[J].Chinese Journal of Geotechnical Engineering,2011,33(7):1123-1128.
[10]郑刚,杜一鸣,刁钰.隔离桩对基坑外既有隧道变形控制的优化分析[J].岩石力学与工程学报,2015,34(增刊1):3499-3509.ZHENG Gang,Du Yiming,DIAO Yu.Optimization analysis of existing pile deformation control of existing piles outside the foundation pit[J].Journal of Rock Mechanics and Engineering,2015,34(Suppl.1):3499-3509.
[11]曾晓鑫,丁文湘,彭玲,等.隔离桩间距对基坑开挖引起地铁隧道的位移影响分析[J].中国科技论文,2018,13(1):17-22.ZENG Xiaoxin,DING Wenxiang,PENG Ling,et al.A-nalysis of the influence of the spacing of the isolation piles on the displacement of the subw ay tunnel caused by the excavation of the foundation pit[J].Chinese Science and Technology Paper,2018,13(1):17-22.
[12]曾晓鑫,丁文湘,彭玲,等.隔离桩桩径对基坑开挖引起既有地铁隧道位移的影响[J].铁道建筑,2017(6):95-97.ZENG Xiaoxin,DING Wenxiang,PENG Ling,et al.Influence of isolated pile diameter on excavation of existing subw ay tunnel caused by foundation pit excavation[J].Railway Construction,2017(6):95-97.
[13]曾晓鑫,丁文湘,彭玲,等.深基坑开挖时隔离桩位置对邻近既有地铁隧道的变形分析[J].科学技术与工程,2017,17(14):296-301.ZENG Xiaoxin,DING Wenxiang,PENG Ling,et al.Deformation analysis of the location of isolation piles in the excavation of deep foundation pits adjacent to existing metro tunnels[J].Science and Technology and Engineering,2017,17(14):296-301.
[14]DONG Y P,BURD H J,HOULSBY G T.Finite element parametric study of the performance of a deep excavation[J].Soils and Foundations,2018,58(3):729-743.
[15]王金昌,陈页开.ABAQUS在土木工程中的应用[M].杭州:浙江大学出版社,2006.
[16]徐中华,王卫东.敏感环境下基坑数值分析中土体本构模型的选择[J].岩土力学,2010,31(1):258-264.XU Zhong hua,WANG Wei dong.Selection of soil constitutive models for numerical analysis of deep excavations in close proximity to sensitive properties[J].Rock and Soil M echanics,2010,31(1):258-264.
[17]LIU C,ZHANG Z,REGUEIRO R A.Pile and pile group response to tunnelling using a large diameter slurry shield-Case study in Shanghai[J].Computers&Geotechnics,2014,59(59):21-43.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |