城市地下立交隧道交叉口施工方法研究
|
摘要
城市立交隧道施工的难点在于两条隧道合并为一条隧道的交叉口施工,该处存在特大断面隧道、偏连拱隧道和小净距隧道型式的多重转换,施工风险高,对工法、工艺要求苛刻。文章以杭州市紫之隧道的地下立交交叉口工程为依托,提出了一种小洞开大洞,然后再横向开挖,最后反向开挖的施工方法和施工工序。结合工程特点,采用有限元数值模拟和监控量测方法验证了该施工方法的合理性。结果表明:对隧道交叉口采用导洞爬坡反向施工方法可以保证分叉段施工安全,解决小洞往大洞方向开挖的难题;分叉隧道开挖过程中,围岩所受拉应力主要集中在拱顶、拱底及中间岩柱上,所受压应力主要集中在中间岩柱及大拱拱腰、小净距外侧拱腰处;衬砌结构最大拉应力出现在拱底,最大压应力发生在拱腰处。
The construction difficulty of an urban underground interchange tunnel is focused on the intersection where two tunnel tubes are incorporated into one-tube tunnel,so the construction is of high risks and the requirements for construction method and technology are rigorous due to multiple conversion of tunnel system modes,such as the super-large section tunnel,the double-arch tunnel and the small-spacing tunnel.Based on construction practice of the underground intersection of Zizhi tunnel in Hangzhou,a construction method and procedure were proposed,namely constructing the large tube from the small tube,then transverse enlarging excavation and finally reverse excavation.The rationality of the proposed construction method was verified by using FEM numerical simulation and monitoring and measuring considering the characteristics of the project.The results show that the construction method of climbing excavation of the adit+transverse enlarging excavation+reverse construction can guarantee the construction safety of tunnel intersection,solve the difficulty excavating from a small tube to a large one;during the construction of the bifurcated tunnel,the tensile stress of surrounding rocks mainly concentrates on the vault,arch bottom and middle rock pillar while the compressive stress mainly concentrates on the middle rock pillar,the haunch of the large arch tunnel and the haunch outside of the small-spacing tunnel;the maximum tensile stress of the lining structure occurs at arch bottom and the maximum compressive stress occurs at haunch.
The construction difficulty of an urban underground interchange tunnel is focused on the intersection where two tunnel tubes are incorporated into one-tube tunnel,so the construction is of high risks and the requirements for construction method and technology are rigorous due to multiple conversion of tunnel system modes,such as the super-large section tunnel,the double-arch tunnel and the small-spacing tunnel.Based on construction practice of the underground intersection of Zizhi tunnel in Hangzhou,a construction method and procedure were proposed,namely constructing the large tube from the small tube,then transverse enlarging excavation and finally reverse excavation.The rationality of the proposed construction method was verified by using FEM numerical simulation and monitoring and measuring considering the characteristics of the project.The results show that the construction method of climbing excavation of the adit+transverse enlarging excavation+reverse construction can guarantee the construction safety of tunnel intersection,solve the difficulty excavating from a small tube to a large one;during the construction of the bifurcated tunnel,the tensile stress of surrounding rocks mainly concentrates on the vault,arch bottom and middle rock pillar while the compressive stress mainly concentrates on the middle rock pillar,the haunch of the large arch tunnel and the haunch outside of the small-spacing tunnel;the maximum tensile stress of the lining structure occurs at arch bottom and the maximum compressive stress occurs at haunch.
引文
[1]胡学兵.地下立交设计施工关键技术研究[J].公路交通技术, 2012,(3):91-95.HU Xuebing. Research on Key Techniques in Design and Construction of Underground Interchanges[J]. Technology of Highway andTransport, 2012,(3):91-95.
[2]黄宣明.大型地下立交隧道施工技术探讨[J].地下空间与工程学报, 2007, 3(4):765-769.HUANG Xuanming. Study on the Construction Technology of Large-scale 3D Traffic Tunnel[J]. Chinese Journal of UndergroundSpace and Engineering, 2007, 3(4):765-769.
[3]罗强,张茜,姚建军,杜细春.地下大型立交结构方案研究及设计创新[J].公路交通技术, 2008,(6):66-70.LUO Qiang, ZHANG Qian, YAO Jianjun, DU Xichun. Scheme Research and Design Innovation on Underground Large-size Inter?change Structure[J]. Technology of Highway and Transport, 2008,(6):66-70.
[4]王渭明,王冲,秦志斌,曹正龙,孙捷城.WANG Weiming, WANG Chong, QIN Zhibin, CAO Zhenglong, SUN Jiecheng. Optimization for Excavation Spacing of Two Lower Tunnel Tubes at Overlapped Section with a Minimum Clear Distance[J]. Modern Tunnelling Technology, 2017, 54(5):200-208.
[5]王海涛,王凯,宋词,常胜涛.地铁隧道钻爆法施工临近埋地管线的安全风险管理研究[J].科学技术与工程, 2015, 15(11):106-110WANG Haitao, WANG Kai, SONG Ci, CHANG Shengtao. Research on Safety Management of Adjacent Buried Pipelines in Blasting Excavation of Subway Tunnel[J]. Science Technology and Engineering, 2015, 15(11):106-110.
[6]张有生.古迹坪隧道雪沟斜井喇叭口施工技术[J].现代隧道技术, 2011, 48(2):132-136.ZHANG Yousheng. Construction Techniques for the Intersection Part of Xuegou Inclined Shaft with Gujiping Tunnel[J]. Modern Tunnelling Technology, 2011, 48(2):132-136.
[7]中华人民共和国交通运输部.公路隧道设计细则:JTG/T D70-2010[S].北京:人民交通出版社, 2010.Ministry of Transport of the People′s Republic of China. Guidelines for Design of Road Tunnel:JTG/T D70-2010[S]. BeiJing:China Communications Press, 2010.
[8]关宝树.隧道工程施工要点集[M].北京:人民交通出版社,2003.Guan Baoshu. Collection of the Key Points in Tunnel Construction[M]. BeiJing:China Communications Press, 2003.
[9]蒋树屏,石波,林志,晋学辉.大型地下立交正交下穿段三维有限元数值分析[J].隧道建设, 2011, 31(3):273-277.JIANG Shuping, SHI Bo, LIN Zhi, JIN Xuehui. 3D FE Numerical Analysis on Undercrossing Section of Underground Interchange[J].Tunnel Construction, 2011, 31(3):273-277.
[10]王辉,赵文娟.叠交隧道设计参数对既有隧道稳定性影响的动态模拟研究[J].现代隧道技术, 2017, 54(1):116-122+152.WANG Hui, ZHAO Wenjuan. Dynamic Simulation of the Effects of Design Parameters of Overlapped Tunnels on the Stability of Existing Tunnels[J]. Modern Tunnelling Technology, 2017, 54(1):116-122+152.
[11]靳晓光,张宪鑫,李勇,林志.大型地下立交动态施工过程3D有限元分析[J].地下空间与工程学报, 2009, 5(2):215-219.JIN Xiaoguang, ZHANG Xianxin, LI Yong, LIN Zhi. 3D Finite Element Research on Dynamic Construction Mechanics for a Largesized Underground Interchange[J]. Chinese Journal of Underground Space and Engineering, 2009, 5(2):215-219.
[2]黄宣明.大型地下立交隧道施工技术探讨[J].地下空间与工程学报, 2007, 3(4):765-769.HUANG Xuanming. Study on the Construction Technology of Large-scale 3D Traffic Tunnel[J]. Chinese Journal of UndergroundSpace and Engineering, 2007, 3(4):765-769.
[3]罗强,张茜,姚建军,杜细春.地下大型立交结构方案研究及设计创新[J].公路交通技术, 2008,(6):66-70.LUO Qiang, ZHANG Qian, YAO Jianjun, DU Xichun. Scheme Research and Design Innovation on Underground Large-size Inter?change Structure[J]. Technology of Highway and Transport, 2008,(6):66-70.
[4]王渭明,王冲,秦志斌,曹正龙,孙捷城.WANG Weiming, WANG Chong, QIN Zhibin, CAO Zhenglong, SUN Jiecheng. Optimization for Excavation Spacing of Two Lower Tunnel Tubes at Overlapped Section with a Minimum Clear Distance[J]. Modern Tunnelling Technology, 2017, 54(5):200-208.
[5]王海涛,王凯,宋词,常胜涛.地铁隧道钻爆法施工临近埋地管线的安全风险管理研究[J].科学技术与工程, 2015, 15(11):106-110WANG Haitao, WANG Kai, SONG Ci, CHANG Shengtao. Research on Safety Management of Adjacent Buried Pipelines in Blasting Excavation of Subway Tunnel[J]. Science Technology and Engineering, 2015, 15(11):106-110.
[6]张有生.古迹坪隧道雪沟斜井喇叭口施工技术[J].现代隧道技术, 2011, 48(2):132-136.ZHANG Yousheng. Construction Techniques for the Intersection Part of Xuegou Inclined Shaft with Gujiping Tunnel[J]. Modern Tunnelling Technology, 2011, 48(2):132-136.
[7]中华人民共和国交通运输部.公路隧道设计细则:JTG/T D70-2010[S].北京:人民交通出版社, 2010.Ministry of Transport of the People′s Republic of China. Guidelines for Design of Road Tunnel:JTG/T D70-2010[S]. BeiJing:China Communications Press, 2010.
[8]关宝树.隧道工程施工要点集[M].北京:人民交通出版社,2003.Guan Baoshu. Collection of the Key Points in Tunnel Construction[M]. BeiJing:China Communications Press, 2003.
[9]蒋树屏,石波,林志,晋学辉.大型地下立交正交下穿段三维有限元数值分析[J].隧道建设, 2011, 31(3):273-277.JIANG Shuping, SHI Bo, LIN Zhi, JIN Xuehui. 3D FE Numerical Analysis on Undercrossing Section of Underground Interchange[J].Tunnel Construction, 2011, 31(3):273-277.
[10]王辉,赵文娟.叠交隧道设计参数对既有隧道稳定性影响的动态模拟研究[J].现代隧道技术, 2017, 54(1):116-122+152.WANG Hui, ZHAO Wenjuan. Dynamic Simulation of the Effects of Design Parameters of Overlapped Tunnels on the Stability of Existing Tunnels[J]. Modern Tunnelling Technology, 2017, 54(1):116-122+152.
[11]靳晓光,张宪鑫,李勇,林志.大型地下立交动态施工过程3D有限元分析[J].地下空间与工程学报, 2009, 5(2):215-219.JIN Xiaoguang, ZHANG Xianxin, LI Yong, LIN Zhi. 3D Finite Element Research on Dynamic Construction Mechanics for a Largesized Underground Interchange[J]. Chinese Journal of Underground Space and Engineering, 2009, 5(2):215-219.