某矩形大断面地下通道超浅埋暗挖工程设计与施工
|
摘要
文章以通过下穿繁忙道路下的2个矩形大断面超浅埋暗挖工程为例,介绍采用锁扣管棚预加固、全断面注浆、型钢拱架支护、分大断面为小断面错位开挖等一系列超浅埋暗挖法设计与施工技术。表明在城市不宜明挖的条件下,采用超浅埋暗挖矩形大断面地下通道有较大的技术优势,并提出:1)采用锁扣管棚是本工程成功的关键,设计时应充分考虑各种工况,设计计算可采用弹性支点法,在入口1H(H为洞高)范围内,管棚内力及支反力变化较大,应仔细考虑,而其后为一般开挖段,内力及支反力均趋于稳定;2)施工前对地下管线进行详细探查尤为重要;3)长距离锁扣管棚施工难度较大,钻进工艺由原来钢管全程双线约束,改为一线一点约束,管棚施工可以顺利进行。
The paper innovates the design and construction method of ultra-shallow buried excavation by introducing an example of two ultra-shallow buried excavation rectangular tunnels,including pre-reinforcement with lock pipe roof,fullface grouting,steel arch support and excavation of both big and small cross-section,etc. The example proves the advantages of ultra-shallow buried excavation when open excavation is impossible in cities and offers the following suggestions:( 1) As the use of lock pipe roof is the key to success,multi-operation conditions should be considered in design,and flexibility fulcrum method should be used in design calculation. In the entrance 1 H range,pipe roof internal force and support reaction changes greatly,to which special attention should be paid. Afterwards it is in a normal excavation stage,pipe roof internal force and support reaction tend to be stable.( 2) It is particularly important to explore the underground pipeline in detail before construction.( 3) As the construction of long lock pipe roof is difficult,the drilling technology has changed from steel pipe double line restraint to one line one point constraint to make pipe roof construction smooth and feasible.
The paper innovates the design and construction method of ultra-shallow buried excavation by introducing an example of two ultra-shallow buried excavation rectangular tunnels,including pre-reinforcement with lock pipe roof,fullface grouting,steel arch support and excavation of both big and small cross-section,etc. The example proves the advantages of ultra-shallow buried excavation when open excavation is impossible in cities and offers the following suggestions:( 1) As the use of lock pipe roof is the key to success,multi-operation conditions should be considered in design,and flexibility fulcrum method should be used in design calculation. In the entrance 1 H range,pipe roof internal force and support reaction changes greatly,to which special attention should be paid. Afterwards it is in a normal excavation stage,pipe roof internal force and support reaction tend to be stable.( 2) It is particularly important to explore the underground pipeline in detail before construction.( 3) As the construction of long lock pipe roof is difficult,the drilling technology has changed from steel pipe double line restraint to one line one point constraint to make pipe roof construction smooth and feasible.
引文
[1]许亚军.超浅埋暗挖隧道下穿高速公路的施工技术[J].隧道建设,2009,29(1):101.XU Yajun.Construction technology for super-shallow-buried underground excavated tunnels crossing underneath freeway[J].Tunnel Construction,2009,29(1):101.
[2]谭忠盛,马栋,孙晓静,等.不停航机场跑道下大断面隧道施工技术[J].土木工程学报,2015,48(增刊1):378.TAN Zhongsheng,MA Dong,SUN Xiaojing,et al.Technique for construction of large cross-section tunnels under uninterrupted airport runway[J].China Civil Engineering Journal,2015,48(S1):378.
[3]段英丽.不停航跑道下超浅埋暗挖隧道初支和二衬施工技术[J].铁道建筑,2014(1):40.DUAN Yingli.Construction technology for initial support and final lining of ultra shallow buried tunnel under uninterrupted airport runway[J].Railway Engineering,2014(1):40.
[4]吴昊.复杂地层浅埋暗挖地铁区间隧道近距离下穿地下商业街设计及施工关键技术[J].隧道建设,2016,36(8):988.WU Hao.Key technologies for design and construction of shallow mined metro tunnels closely crossing underneath existing underground commercial street in complex strata[J].Tunnel Construction,2016,36(8):988.
[5]谢勇涛.浅埋大跨隧道平行下穿既有地下商业街施工技术研究[J].隧道建设,2015,35(3):238.XIE Yongtao.Study of construction technologies for shallowcovered long-large tunnel running underneath along existing underground commercial street[J].Tunnel Construction,2015,35(3):238.
[6]董子龙,隆卫.大连地铁兴工街站复合地层超大跨浅埋暗挖施工关键技术[J].隧道建设,2013,33(6):489.DONG Zilong,LONG Wei.Key technology of super large span shallow excavation construction in composite stratum of Xinggong Street Station of Dalian Metro[J].Tunnel Construction,2013,33(6):489.
[7]刘诚,丁文其,谈识,等.基于软弱围岩变形控制工法的浅埋隧道变形现场监测分析[J].公路隧道,2016,95(3):1.LIU Cheng,DING Wenqi,TAN Shi,et al.Monitoring analysis of shallow tunnel deformation based on deformation control method of weak surrounding rock[J].Highway Tunnel,2016,95(3):1.
[8]赵胜,陈浩.砂卵石地层超浅埋小净距暗挖群洞施工探析[J].隧道建设,2015,35(9):907.ZHAO Sheng,CHEN Hao.Study of construction of ultrashallow and small clear-distance grouting in sand-gravel stratum[J].Tunnel Construction,2015,35(9):907.
[9]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(1):100.ZAN Yongqi.Study of construction deformation control technology for super-shallow-buried mined tunnel crossing underneath highway[J].Tunnel Construction,2017,37(1):100.
[10]赵佳云.高速铁路隧道下穿京藏高速公路施工技术研究[J].施工技术,2017,46(1):99.ZHAO Jiayun.Research on construction technology of high speed railway tunnel passing through Beijing-Tibet Expressway[J].Construction Technology,2017,46(1):99.
[11]唐新权.浅埋暗挖大跨黄土隧道下穿地下行包通道沉降分析及对策[J].隧道建设,2016,36(1):80.TANG Xinquan.Settlement analysis on and countermeasures for shallow-covered large-span loess tunnel constructed by mining method crossing underneath baggage-dedicated gallery of airport[J].Tunnel Construction,2016,36(1):80.
[12]张向东,李庆文,李桂秀,等.浅埋松软地层管棚注浆施工引起地表沉降分析[J].岩石力学与工程学报,2013(增刊2):4091.ZHANG Xiangdong,LI Qingwen,LI Guixiu,et al.Analysis of ground settlement induced by pipe grouting in shallow soft formations[J].Chinese Journal of Rock Mechanics and Engineering,2013(S2):4091.
[13]孙玉永,周顺华,肖红菊,等.管棚法应用于软土地层的稳定性分析[J].岩石力学与工程学报,2013(增刊2):4199.SUN Yuyong,ZHOU Shunhua,XIAO Hongju,et al.Application of pipe roof method to the stability analysis of soft soil layer[J].Chinese Journal of Rock Mechanics and Engineering,2013(S2):4199.
[14]赵辉.软土地层大断面矩形隧道结构施工力学行为监测与分析[J].隧道建设,2017,37(1):46.ZHAO Hui.Monitoring and analysis of construction mechanics behavior of rectangular tunnel structure with large cross-section in soft soil[J].Tunnel Construction,2017,37(1):46.
[2]谭忠盛,马栋,孙晓静,等.不停航机场跑道下大断面隧道施工技术[J].土木工程学报,2015,48(增刊1):378.TAN Zhongsheng,MA Dong,SUN Xiaojing,et al.Technique for construction of large cross-section tunnels under uninterrupted airport runway[J].China Civil Engineering Journal,2015,48(S1):378.
[3]段英丽.不停航跑道下超浅埋暗挖隧道初支和二衬施工技术[J].铁道建筑,2014(1):40.DUAN Yingli.Construction technology for initial support and final lining of ultra shallow buried tunnel under uninterrupted airport runway[J].Railway Engineering,2014(1):40.
[4]吴昊.复杂地层浅埋暗挖地铁区间隧道近距离下穿地下商业街设计及施工关键技术[J].隧道建设,2016,36(8):988.WU Hao.Key technologies for design and construction of shallow mined metro tunnels closely crossing underneath existing underground commercial street in complex strata[J].Tunnel Construction,2016,36(8):988.
[5]谢勇涛.浅埋大跨隧道平行下穿既有地下商业街施工技术研究[J].隧道建设,2015,35(3):238.XIE Yongtao.Study of construction technologies for shallowcovered long-large tunnel running underneath along existing underground commercial street[J].Tunnel Construction,2015,35(3):238.
[6]董子龙,隆卫.大连地铁兴工街站复合地层超大跨浅埋暗挖施工关键技术[J].隧道建设,2013,33(6):489.DONG Zilong,LONG Wei.Key technology of super large span shallow excavation construction in composite stratum of Xinggong Street Station of Dalian Metro[J].Tunnel Construction,2013,33(6):489.
[7]刘诚,丁文其,谈识,等.基于软弱围岩变形控制工法的浅埋隧道变形现场监测分析[J].公路隧道,2016,95(3):1.LIU Cheng,DING Wenqi,TAN Shi,et al.Monitoring analysis of shallow tunnel deformation based on deformation control method of weak surrounding rock[J].Highway Tunnel,2016,95(3):1.
[8]赵胜,陈浩.砂卵石地层超浅埋小净距暗挖群洞施工探析[J].隧道建设,2015,35(9):907.ZHAO Sheng,CHEN Hao.Study of construction of ultrashallow and small clear-distance grouting in sand-gravel stratum[J].Tunnel Construction,2015,35(9):907.
[9]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(1):100.ZAN Yongqi.Study of construction deformation control technology for super-shallow-buried mined tunnel crossing underneath highway[J].Tunnel Construction,2017,37(1):100.
[10]赵佳云.高速铁路隧道下穿京藏高速公路施工技术研究[J].施工技术,2017,46(1):99.ZHAO Jiayun.Research on construction technology of high speed railway tunnel passing through Beijing-Tibet Expressway[J].Construction Technology,2017,46(1):99.
[11]唐新权.浅埋暗挖大跨黄土隧道下穿地下行包通道沉降分析及对策[J].隧道建设,2016,36(1):80.TANG Xinquan.Settlement analysis on and countermeasures for shallow-covered large-span loess tunnel constructed by mining method crossing underneath baggage-dedicated gallery of airport[J].Tunnel Construction,2016,36(1):80.
[12]张向东,李庆文,李桂秀,等.浅埋松软地层管棚注浆施工引起地表沉降分析[J].岩石力学与工程学报,2013(增刊2):4091.ZHANG Xiangdong,LI Qingwen,LI Guixiu,et al.Analysis of ground settlement induced by pipe grouting in shallow soft formations[J].Chinese Journal of Rock Mechanics and Engineering,2013(S2):4091.
[13]孙玉永,周顺华,肖红菊,等.管棚法应用于软土地层的稳定性分析[J].岩石力学与工程学报,2013(增刊2):4199.SUN Yuyong,ZHOU Shunhua,XIAO Hongju,et al.Application of pipe roof method to the stability analysis of soft soil layer[J].Chinese Journal of Rock Mechanics and Engineering,2013(S2):4199.
[14]赵辉.软土地层大断面矩形隧道结构施工力学行为监测与分析[J].隧道建设,2017,37(1):46.ZHAO Hui.Monitoring and analysis of construction mechanics behavior of rectangular tunnel structure with large cross-section in soft soil[J].Tunnel Construction,2017,37(1):46.