拱北隧道5台阶14部开挖施工组织方案分析
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摘要
港珠澳大桥拱北隧道口岸暗挖段采用255 m曲线管幕+冻结法施工,采用5台阶14部开挖方法穿越富水软弱地层及拱北口岸敏感区域。为解决该工法下大断面开挖及多工序交叉作业施工的施工组织及安全问题,从现场管理角度出发介绍5台阶14部开挖法的施工方案,通过现场施工验证方案的可行性,并分析施工中存在的部分台阶断面划分、导洞施工顺序安排、工作面设置等方面存在的问题。据此,提出开挖方案和施工组织优化思路以及增设斜坡道的比选方案,监测结果表明:施工组织调整及优化是切实可行的,能够确保拱北隧道按期顺利贯通。
The 255 m-long mined section of Gongbei Tunnel of Hong Kong-Zhuhai-Macao Bridge,crosses water-rich weak stratum and sensitive area of Gongbei Port,is constructed by curved pipe roof + freezing method and five-bench and fourteen-step excavation method.In order to guarantee the smooth construction organization and construction safety,the detail of five-bench and fourteen-step excavation method is introduced from the perspective of site management;the feasibility of the scheme is verified by field construction;and the existing problems,such as cross-section division of some benches,construction sequence arrangement of pilot tunnel,working face arrangement,etc.,are put forward.Finally,the idea of excavation scheme and construction organization optimization and the comparison and selection scheme of adding ramp are proposed,and the monitoring results show that:The construction organization adjustment and optimization are feasible,which can ensure the smooth completion of Gongbei Tunnel on schedule.
The 255 m-long mined section of Gongbei Tunnel of Hong Kong-Zhuhai-Macao Bridge,crosses water-rich weak stratum and sensitive area of Gongbei Port,is constructed by curved pipe roof + freezing method and five-bench and fourteen-step excavation method.In order to guarantee the smooth construction organization and construction safety,the detail of five-bench and fourteen-step excavation method is introduced from the perspective of site management;the feasibility of the scheme is verified by field construction;and the existing problems,such as cross-section division of some benches,construction sequence arrangement of pilot tunnel,working face arrangement,etc.,are put forward.Finally,the idea of excavation scheme and construction organization optimization and the comparison and selection scheme of adding ramp are proposed,and the monitoring results show that:The construction organization adjustment and optimization are feasible,which can ensure the smooth completion of Gongbei Tunnel on schedule.
引文
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[13]程勇,刘继国.拱北隧道设计方案[J].公路隧道,2012(3):34.CHENG Yong,LIU Jiguo.Design of Gongbei Tunnel[J].Highway Tunnel,2012(3):34.
[14]余晶,程勇,贾瑞华.港珠澳大桥珠海连接线拱北隧道方案论证[J].现代隧道技术,2012,49(1):119.YU Jing,CHENG Yong,JIA Ruihua.Option demonstration for the Gongbei Tunnel at the Zhuhai Link of the Hong Kong-Zhuhai-Macau Bridge[J].Modern Tunnelling Technology,2012,49(1):119.
[15]程占,程勇,刘志刚.拱北隧道管幕-暗挖法工作井设计关键技术[J].隧道建设,2015,35(11):1214.CHENG Zhan,CHENG Yong,LIU Zhigang.Key technologies for design of working shaft of Gongbei Tunnel:Considering tunneling and pipe jacking conditions[J].Tunnel Construction,2015,35(11):1214.
[2]郭卫社.浅埋暗挖法新趋势[J].隧道建设,2012,32(6):757.GUO Weishe.New trends of shallow-cover mining method[J].Tunnel Construction,2012,32(6):757.
[3]吴延平,王军,刘建民,等.浅埋暗挖法改良淤泥地层注浆方案选取的试验研究[J].岩石力学与工程学报,2013(增刊2):3575.WU Yanping,WANG Jun,LIU Jianmin,et al.Experimental study of grouting plants of shallow tunneling method to improve intensity in mud ground[J].Chinese Journal of Rock Mechanics and Engineering,2013(S2):3575.
[4]赵文,董驾潮,贾鹏蛟,等.地铁暗挖车站STS管幕结构施工技术研究[J].隧道建设(中英文),2018,38(1):72.ZHAO Wen,DONG Jiachao,JIA Pengjiao,et al.Study of construction technology of steel tube slab structure for mined metro station[J].Tunnel Construction,2018,38(1):72.
[5]张鹏,潘建立,刘应亮,等.拱北隧道曲线顶管管幕施工关键技术[J].隧道建设,2016,36(8):968.ZHANG Peng,PAN Jianli,LIU Yingliang,et al.Key construction technologies for curved jacking pipe roofing of Gongbei Tunnel[J].Tunnel Construction,2016,36(8):968.
[6]樊文虎,杨平,蒋大有,等.全断面注浆管棚矩形冻结加固技术与实测分析[J].地下空间与工程学报,2017,13(2):551.FAN Wenhu,YANG Ping,JIANG Dayou,et al.Rectangular freeing reinforcement technology of full-face grouting pipe-roof and measuring analysis[J].Chinese Journal of Underground Space and Engineering,2017,13(2):551.
[7]胡向东,任辉,陈锦,等.管幕冻结法积极冻结方案模型试验研究[J].现代隧道技术,2014,51(5):92.HU Xiangdong,REN Hui,CHEN Jin,et al.Model test study of the active freezing scheme for the combined piperoof and freezing method[J].Modern Tunnelling Technology,2014,51(5):92.
[8]昝永奇.超浅埋下穿高速公路暗挖隧道变形控制施工技术研究[J].隧道建设,2017,37(增刊1):99.ZAN Yongqi.Study of construction deformation control technology for super shallow-buried mined tunnel crossing underneath highway[J].Tunnel Construction,2017,37(S1):99.
[9]台启民.暗挖交叠隧道地表沉降实测分析[J].现代隧道技术,2017,54(4):193.TAI Qimin.Analysis of measured surface settlements induced by bored overlapping tunnels[J].Modern Tunnelling Technology,2017,54(4):193.
[10]邹金杰,章立峰,胡贤国,等.繁华城区饱和软土地层过街通道浅埋暗挖施工关键技术[J].现代隧道技术,2017,54(3):195.ZOU Jinjie,ZHANG Lifeng,HU Xianguo,et al.Key techniques for an urban underpass in saturated soft soils constructed by the shallow mining method[J].Modern Tunnelling Technology,2017,54(3):195.
[11]王坤,杨会军,孔恒.浅埋暗挖隧道扣拱施工影响效应分析[J].隧道建设,2015,35(4):311.WANG Kun,YANG Huijun,KONG Heng.Analysis on influence of arch construction of shallow-covered mined tunnel[J].Tunnel Construction,2015,35(4):311.
[12]刘泉声,彭星新,雷广峰,等.特大断面浅埋暗挖隧道十字岩柱开挖技术模型试验研究[J].岩土力学,2017,38(10):2780.LIU Quansheng,PENG Xingxin,LEI Guangfeng,et al.Geomechanical model test on excavation technology of supper-large cross-section ultra-shallow tunnel with cross rock pillar method[J].Rock and Soil Mechanics,2017,38(10):2780.
[13]程勇,刘继国.拱北隧道设计方案[J].公路隧道,2012(3):34.CHENG Yong,LIU Jiguo.Design of Gongbei Tunnel[J].Highway Tunnel,2012(3):34.
[14]余晶,程勇,贾瑞华.港珠澳大桥珠海连接线拱北隧道方案论证[J].现代隧道技术,2012,49(1):119.YU Jing,CHENG Yong,JIA Ruihua.Option demonstration for the Gongbei Tunnel at the Zhuhai Link of the Hong Kong-Zhuhai-Macau Bridge[J].Modern Tunnelling Technology,2012,49(1):119.
[15]程占,程勇,刘志刚.拱北隧道管幕-暗挖法工作井设计关键技术[J].隧道建设,2015,35(11):1214.CHENG Zhan,CHENG Yong,LIU Zhigang.Key technologies for design of working shaft of Gongbei Tunnel:Considering tunneling and pipe jacking conditions[J].Tunnel Construction,2015,35(11):1214.