由拳路下穿沪昆铁路箱涵顶进施工监测及变形控制分析
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摘要
箱涵顶进工法已成为下穿既有线路一种重要的施工方法。其凭借高效、快捷、自能化的优势,在工程中得到了广泛的推广和应用。施工中的变形控制及既有线路的运行安全,是此类工程设计及施工优先考虑的问题。具体工程因水文地质条件、线路工况、工期及环境保护要求等不同,已有的工程经验并不能照搬套用,很多施工技术有待改进。
课题以浙江省嘉兴市由拳路下穿沪昆铁路立交桥工程为背景,运用理论分析、数值模拟、工程计算,并结合现场实时监测数据,对大跨度箱涵顶进施工关键技术做了系统研究,具体包括以下内容：
(1)在总结前人箱涵顶进施工技术的基础上,结合本项目的安全、质量、工期、成本等指标要求,系统研究了由拳路下穿沪昆铁路大跨度箱涵顶进施工成套施工技术。
(2)采用人工与自动监测技术对沪昆铁路线进行沉降变形监测,通过采集施工中的数据信息及时调整设计,反馈到施工中,这样可使设计更加合理,真正做到信息化施工；实测数据显示,线路经过便梁-系梁-桩基的加固,只要沉降量不超过4mm,就可确保顶进施工过程中铁路运营安全及施工人员的人身安全。
(3)结合本项目的工程地质、水文地质特点及既有线路运输繁忙的工况,从理论上研究了大跨度箱涵施工中加固线路的沉降变形的影响因素,得出移动荷载的振动效应和施工扰动是项目应优先防范和监控的危害,并对工程中的移动荷载引起的沉降进行了理论计算。
(4)采用ABAQUS软件进行工况的模拟,分析箱涵顶进施工引起周围环境变化规律,并将监测数据与软件数值模拟计算结果对比分析,得出两者在数值上比较接近,变化规律上较一致,表明以本项目为背景形成的成套施工技术在计算上可行,在实践上有效,可用于类似项目。
Box culvert jacking has become an important construction beneath the existing line.lt has been wilding promoted and applied for its unique advantages such as efficient,fast and self-energy. Deformation control of construction the and safe operation of the existing line are priority issues in engineering design and construction.The existing experience in engineering can not be applied without any change for specific project's unique characteristics such as hydrological and geological conditions,route conditions and environmental requirements of different duration. So there are a lot of room for improvement in construction technology.
Base on Youquan road across the culvert of Shanghai-Kunming railway in Jiaxing city, Zhejiang province, this paper does a systematic study of construction of key technologies of long-span box culver jacking by means of analytical equation, numerical simulation, engineering calculations and site measurement, specifically include the following:
(1) Based on the results of prevention studies and the index of the project,such as safety,quality,duration and cost target,this paper gives a systematic study of key technologies of long-span box culvert in Youquan road beneath Shanghai-Kunming railway.
(2) Manual and automated monitoring technology were used in monitoring settlement and deformation of the existing railway.Through collected data to adjust the design,back to the construction,it will make the design more rational and tuly informative construction.Measured data show that the safety of staff and railway operations can be ensure when the settlement of existing railway reinforced by Will beam-Tie beam-Pile is no more than 4 mm.
(3)With the project engineering geology,hydrogeology characteristics and busy condition of existing transportation lines, this paper does a systematic study of the law of settlement deformation of reinforced line by means of analytical equation. Come to the vibration of moving loads and the effects of disturbance should be give priority to prevention and control in the similar projects,and do a theoretical calculation of the settlement caused by the moving load in the projece.
(4) Simulating conditions by ABAQUS software,this paper analyze for changes of the surrounding environment caused by box culvert jacking, and monitoring data and software simulation results compared. Measured data is perfect consistent with calculated settlement deformation, so it show that the complete technique is feasible in compulation and effective in practice, and it can be used in similar project.
课题以浙江省嘉兴市由拳路下穿沪昆铁路立交桥工程为背景,运用理论分析、数值模拟、工程计算,并结合现场实时监测数据,对大跨度箱涵顶进施工关键技术做了系统研究,具体包括以下内容：
(1)在总结前人箱涵顶进施工技术的基础上,结合本项目的安全、质量、工期、成本等指标要求,系统研究了由拳路下穿沪昆铁路大跨度箱涵顶进施工成套施工技术。
(2)采用人工与自动监测技术对沪昆铁路线进行沉降变形监测,通过采集施工中的数据信息及时调整设计,反馈到施工中,这样可使设计更加合理,真正做到信息化施工；实测数据显示,线路经过便梁-系梁-桩基的加固,只要沉降量不超过4mm,就可确保顶进施工过程中铁路运营安全及施工人员的人身安全。
(3)结合本项目的工程地质、水文地质特点及既有线路运输繁忙的工况,从理论上研究了大跨度箱涵施工中加固线路的沉降变形的影响因素,得出移动荷载的振动效应和施工扰动是项目应优先防范和监控的危害,并对工程中的移动荷载引起的沉降进行了理论计算。
(4)采用ABAQUS软件进行工况的模拟,分析箱涵顶进施工引起周围环境变化规律,并将监测数据与软件数值模拟计算结果对比分析,得出两者在数值上比较接近,变化规律上较一致,表明以本项目为背景形成的成套施工技术在计算上可行,在实践上有效,可用于类似项目。
Box culvert jacking has become an important construction beneath the existing line.lt has been wilding promoted and applied for its unique advantages such as efficient,fast and self-energy. Deformation control of construction the and safe operation of the existing line are priority issues in engineering design and construction.The existing experience in engineering can not be applied without any change for specific project's unique characteristics such as hydrological and geological conditions,route conditions and environmental requirements of different duration. So there are a lot of room for improvement in construction technology.
Base on Youquan road across the culvert of Shanghai-Kunming railway in Jiaxing city, Zhejiang province, this paper does a systematic study of construction of key technologies of long-span box culver jacking by means of analytical equation, numerical simulation, engineering calculations and site measurement, specifically include the following:
(1) Based on the results of prevention studies and the index of the project,such as safety,quality,duration and cost target,this paper gives a systematic study of key technologies of long-span box culvert in Youquan road beneath Shanghai-Kunming railway.
(2) Manual and automated monitoring technology were used in monitoring settlement and deformation of the existing railway.Through collected data to adjust the design,back to the construction,it will make the design more rational and tuly informative construction.Measured data show that the safety of staff and railway operations can be ensure when the settlement of existing railway reinforced by Will beam-Tie beam-Pile is no more than 4 mm.
(3)With the project engineering geology,hydrogeology characteristics and busy condition of existing transportation lines, this paper does a systematic study of the law of settlement deformation of reinforced line by means of analytical equation. Come to the vibration of moving loads and the effects of disturbance should be give priority to prevention and control in the similar projects,and do a theoretical calculation of the settlement caused by the moving load in the projece.
(4) Simulating conditions by ABAQUS software,this paper analyze for changes of the surrounding environment caused by box culvert jacking, and monitoring data and software simulation results compared. Measured data is perfect consistent with calculated settlement deformation, so it show that the complete technique is feasible in compulation and effective in practice, and it can be used in similar project.
引文
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[2]海潮,朱尔玉,许庆.在斜交箱形梁桥下开挖地铁时梁体有限元分析[J].铁道建筑,2005,(12)：27-29.
[3]张健,高秀梅,黄生根.既有线下穿箱涵工程对周围环境影响的研究[J].铁道工程学报,2009,(10)：41-46.
[4]孙旻,徐伟.软土地层管幕法施工三维数值模拟[J].岩士工程学报,2006,28(增)：4999-5005.
[5]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.
[6]仇文革.地下工程近接施工力学原理与对策研究[D].成都：西南交通大学士木工程学院,2003.11-38. (QIU Wenge.The Study on mechanics principle and countermeasure of approaching excavation in under ground works[D].Chengdu:The Civil seminary of Southwest Jiao tong U niv ersity,2003.11-38. (in Chinese))
[7]K.M.iLee., R.K. Rowe Finite(?)element(?)modelling of the three-idimensional(?)ground(?) deformationsdue to tunnelling in soft cohesive soils:Part Ⅰ— Method of analysis
[8]Solidman E, Duddeck H. Two and three dimensional analysis of closely double-tube tunnel[J].Tunneling and Underground Space Technology,1993,8 (1):13-18.
[9]I.Yamaguchi.l.Yamazaki, Y.Kirilani.Study of Ground-Tunnel Interacations of Four Shield Tunnels Driven in Close Proximity, in Relation to Design and Construction of Parallel Shield Tunnels[J].Tunnelling and Underground Space Technology.1998,13 (3):289-304.
[10]郑余朝.地铁区间重叠隧道近接施工力学行为三维数值模拟[D].西南交大学,2000.
[11]徐林生.公路隧道施工.围岩稳定性监测预报系统与隧道工程数值模拟研究[R].同济大学,博士后研究工作报告,2001,6.
[12]孙钧,刘洪洲.交叠隧道盾构法施工引起地面沉降的三维模似研究[J].同大学报,2002,30(4)：379-384.
[13]张璞.列车振动荷载作用下上行近距离地铁区间交叠隧道的动力响应分析[D].同济大学,2001.
[14]毕见山.大型顶进箱涵施工技术研究[D].上海交通大学,2008.
[15]彭智勇.盾构隧道下穿既有铁路站场地加固研究[D].北京交通大学,2008.
[16]纪颖波.天津地铁既有线改造中的隧道位移控制研究[D].天津：天津大学,2002,1.
[17]黄生根,张健,张晓炜.超大型箱涵顶进引起的地层位移规律研究[J].岩土力学,2009,30(2)：387-392.
[18]卜昌富.上海世博轴地下大空间结构超厚覆土施工过程数值模拟分析[J].建筑施工,2010,32(3)：200-207.
[19]孙杰.大断面管棚--箱涵顶进的箱涵结构数值模拟[J].河南科学,2007,25(3)：457-460.
[20]郭运华.基于试验设计原理的位移反分析与施工过程仿真研究[D].武汉理工大学,2006
[21]李超.北京地铁区间隧道地表模型试验研究[D].北京交通大学,2010.
[22]ShirlawJ.N.Tham-Lee5.K., WongF.K., Ang-WongL.P., ChenD.C., OsborneN.andTanC.G. Planning he monitoring required to eonfirm them ovemen tandrotation of tunnel sand traek work due to exeavation and tunneling [C]. Proeeeding softhe International Confereneeon Tunnel and Underground Struetures, SingaPore,2000:489 - 494.
[23]杨虹,韩金刚.穿越既有线超浅埋暗挖通道的质量监控[J].铁道工程报,2005,5：71—74.
[24]向昌平.大断面箱涵单端超长顶进监控量测技术的研究[J].石家庄铁道学院学报(自然科学版),2008,21(1):102-104. (XingiChangping. The monitoring technique of large cross-section box culvert during extra long distance jacking[J]. Journal of Shijiazhuang Railway Institute (Natural Science),2008,21 (1):102-104. (in Chinese))
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