城市快速路小间距并行高铁深塘跨越技术
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摘要
以小间距并行京沪高铁的苏州中环城市快速路深塘跨越段为研究对象,利用数值方法从京沪高铁桥梁墩台水平位移、沉降、桩身轴力及桩侧摩阻力等四方面分析了传统高填方路基填筑及运营对京沪高铁带来的影响。研究表明:高填方路基引起的地层扰动引起的京沪高铁水平位移远远超过限值,会对其高架桥造成较为严重的破坏。提出了采用"预应力混凝土空心板梁,先简支后连续桥面、重力式桥台、钻孔灌注桩基础、墩高4 m"的矮桥深塘跨越技术。数值模拟分析可知,该技术对京沪高铁扰动极小,结合施工过程中的监控量测,验证了矮桥深塘跨越技术的可靠性。
A deep pond section of a city expressway with small interval parallel to the Beijing-Shanghai High-Speed Railway was taken as engineering background.The impact of traditional high embankment on the Beijing-Shanghai High-Speed Railway was analyzed by numerical method from the following four aspects:horizontal displacement and settlement of bridge piers,axial force and skin friction of piles.The results indicated that horizontal displacement of the Beijing-Shanghai High-speed Railway caused by high embankment was far more than the limit,which would cause serious damage to its viaduct.So a spanning technology using low bridges was put forward,which included pre-stressed concrete slab beam,continuous bridge deck erected as simple-supported,gravity abutment,bored pile foundation and 4 m pier.Displacement caused by the low bridge was far less than the limit value.This technology would not affect the normal operation of the Beijing-Shanghai High-speed Railway.Subsequent monitoring results also showed that the low bridge was a reliable technology to spanning deep pond with small interval paralleling to high-speed railway.
A deep pond section of a city expressway with small interval parallel to the Beijing-Shanghai High-Speed Railway was taken as engineering background.The impact of traditional high embankment on the Beijing-Shanghai High-Speed Railway was analyzed by numerical method from the following four aspects:horizontal displacement and settlement of bridge piers,axial force and skin friction of piles.The results indicated that horizontal displacement of the Beijing-Shanghai High-speed Railway caused by high embankment was far more than the limit,which would cause serious damage to its viaduct.So a spanning technology using low bridges was put forward,which included pre-stressed concrete slab beam,continuous bridge deck erected as simple-supported,gravity abutment,bored pile foundation and 4 m pier.Displacement caused by the low bridge was far less than the limit value.This technology would not affect the normal operation of the Beijing-Shanghai High-speed Railway.Subsequent monitoring results also showed that the low bridge was a reliable technology to spanning deep pond with small interval paralleling to high-speed railway.
引文
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[21]彭文斌.FLAC 3D实用教程[M].北京:机械工业出版社,2008.
[22]周宏益.碎石土高填方填筑体变形数值模拟[J].土工基础,2010,24(3):39-42.ZHOU Hongyi.Numerical simulation study of deformation of gravel soil high embankment[J].Soil Engineering and Foundation,2010,24(3):39-42.(编辑:甄鹏)
[2]刘光秀.分级填筑过程中软土路基稳定性失效的演化机制[J].价值工程,2014,33(20):104-106.LIU Guangxiu.The evolution mechanism of stability invalidation for the soft-clay ground during the stage construction[J].Value Engineering,2014,33(20):104-106.
[3]赵明华,刘煜,曹文贵.软土路基沉降发展规律及其预测[J].中南大学学报(自然科学版),2004,35(1):157-161.ZHAO Minghua,LIU Yu,CAO Wengui.The developing regularity and forecasting of settlement in soft clay roadbed[J].Journal of Central South University(Natural Science),2004,35(1):157-161.
[4]龙海涛,李天斌,孟陆波,等.高填方软土路基快速填筑沉降监测规律及FLAC~(3D)模拟[J].四川建筑科学研究,2012,38(4):156-159.LONG Haitao,LI Tianbin,MENG Lubo,et al.The settlement monitoring regulation of fast-filling high refilled soft clay and the FLAC3D simulation[J].Sichuan Building Science,2012,38(4):156-159.
[5]冯学钢.高填方路基沉降处治灌浆技术的工程实践与认识[J].岩石力学与工程学报,2006,25(2):334-339.FENG Xuegang.Practice and understanding of grouting technique in treatment of highway subgrade settlement[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(2):334-339.
[6]陈晓燕,张宏博,宋修广.湖相软土区路基填筑引起的地基沉降特性研究[J].公路与汽运,2009(1):84-88.CHEN Xiaoyan,ZHANG Hongbo,SONG Xiuguang.Study on foundation settlement induced by roadbed filling in lake facie soft soil region[J].Highways&Automotive Applications,2009(1):84-88.
[7]王洪德,张立漫.软土路基分级填筑过程地表沉降规律分析[J].辽宁工程技术大学学报(自然科学版),2011,30(6):870-874.WANG Hongde,ZHANG Liman.Ground settlement analysis on the process of stage-filling for soft clay roadbed[J].Journal of Liaoning Technical University(Natural Science),2011,30(6):870-874.
[8]蔡国军,刘松玉.软基上桥头路基填筑对桥台桩的影响研究综述[J].岩石力学与工程学,2004,23(12):2072-2077.CAI Guojun,LIU Songyu.Review on lateral deformation effects of embankment on piled bridge abutments on soft clay[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(12):2072-2077.
[9]杨泉,高柏松,李井元,等.新建线临近既有无砟高速铁路路基施工方案研究[J].高速铁路技术,2016,7(2):15-19.YANG Quan,GAO Baisong,LI Jingyuan,et al.Research on subgrade construction scheme of newly built railway close to ballastless track high-speed railway[J].High Speed Railway Technology,2016,7(2):15-19.
[10]吴立坚,郑甲佳,邓捷.高液限土路基的沉降变形规律[J].岩土力学,2013,34(增刊2):351-355.WU Lijian,ZHENG Jiajia,DENG Jie.Settlement law of high liquid limit soil embankment[J].Rock and Soil Mechanics,2013,34(Suppl.2):351-355.
[11]国家铁路局,高速铁路设计规范:TB-10621-2014[S].北京:中国铁道出版社,2014.
[12]中华人民共和国交通运输部,公路路基设计规范:JTG D30-2015[S].北京:人民交通出版社,2015.
[13]周小文,陈凌伟,程展林,等.软基路堤施工稳定性控制标准研究[J].岩土力学,2016,37(9):2631-2635.ZHOU Xiaowen,CHEN Lingwei,CHENG Zhanlin,et al.Stability controlling standard for embankment construction on soft soil ground[J].Rock and Soil Mechanics,2016,37(9):2631-2635.
[14]刘奉银,赵然,谢定义,等.黄土高填方路堤沉降分析[J].长安大学学报(自然科学版),2003,23(6):23-28.LIU Fengyin,ZHAO Ran,XIE Dingyi,et al.Settlement of loess-filled highway embankment[J].Journal of Chang'an University(Natural Science),2003,23(6):23-28.
[15]容耀华.某高填方软土路基特殊路段处治方案比选[J].公路,2006(4):155-159.RONG Yaohua.Comparison and selection of treatment schemes for a certain high embankment soft soil subgrade[J].Highway,2006(4):155-159.
[16]韩宗良.公路高填方路基沉降变形研究[J].低碳世界,2016(18):194-195.HAN Zongliang.Study on settlement and deformation of highway high fill roadbed[J].Low Carbon World,2016(18):194-195.
[17]张丙印,温彦锋,朱本珍,等.土工构筑物和边坡工程发展综述:作用机理与数值模拟方法[J].土木工程学报,2016,49(8):1-15,35.ZHANG Bingyin,WEN Yanfeng,ZHU Benzhen,et al.Action mechanism and numerical simulation methods of soil structures and slope engineering:the state-of-the-art[J].China Civil Engineering Journal,2016,49(8):1-15,35.
[18]徐会杰,彭华,徐希磊,等.盾构下穿城际客运专线引起变形的数值分析[J].都市快轨交通,2013,26(6):68-72.XU Huijie,PENG Hua,XU Xilei,et al.Numerical analysis of ground deformations caused by shield tunneling under-crossing beijing-tianjin intercity passenger dedicated railway[J].Urban Rapid Rail Transit,2013,26(6):68-72.
[19]陈海丰,袁大军,王飞,等.软弱地层地铁盾构下穿高铁的安全控制技术研究[J].土木工程学报,2015,48(增刊1):256-260.CHEN Haifeng,YUAN Dajun,WANG Fei,et al.Study on safe control of metro shield underpassing high-speed railway in weak stratum[J].China Civil Engineering Journal,2015,48(Suppl.1):256-260.
[20]徐干成,李成学,王后裕,等.地铁盾构隧道下穿京津城际高速铁路影响分析[J].岩土力学,2009,30(增刊2):269-272,276.XU Gancheng,LI Chengxue,WANG Houyu,et al.Analysis of influence of metro shield tunneling crossing underneath high speed railway[J].Rock and Soil Mechanics,2009,30(Suppl.2):269-272,276.
[21]彭文斌.FLAC 3D实用教程[M].北京:机械工业出版社,2008.
[22]周宏益.碎石土高填方填筑体变形数值模拟[J].土工基础,2010,24(3):39-42.ZHOU Hongyi.Numerical simulation study of deformation of gravel soil high embankment[J].Soil Engineering and Foundation,2010,24(3):39-42.(编辑:甄鹏)