大跨度高塔柱桥基边坡稳定性研究
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摘要
浙江省舟山西堠门大桥为一主跨跨度为1 650 m的悬索桥,其主塔高度约200 m,且位于海中的孤岛上。桥基所在地层为晚侏罗系流纹斑岩,山体顶部有少量坡残积层,地形上该山体平均长200 m、宽80 m,四面临空,且受数条小断层及其他构造裂隙的影响,山体岩体完整性较差。显然考虑大跨度和高塔柱的联合作用,尤其是台风的叠加作用下,桥基边坡稳定性是该大桥方案能否成立的关键。结合桥基设计位置,在考虑工程荷载作用下,未来边坡最易发生失稳的部位应是南侧边坡,其余地段发生较大规模失稳的可能性小。通过现场地质调查,在查明控制桥基南侧边坡稳定的控制性边界条件基础上,通过多种计算方法,系统分析受上部结构荷载尤其是风荷载等综合作用下的工程边坡稳定性。
The main span of Xihoumen Suspension Bridge is 1 650 m,and its main tower(bridge foundation) with height above 200 m lies on an island in the sea.Stratum near the bridge foundation is rhyolite porphyry in late Jurassic period.A little of slope eluvium exists on the top of the mountain,which is 200 m long and 80 m wide,and its all sides face to sea.The integrality of rock mass of the mountain is relatively poor because of the effect of some faults and other structural fissures.Obviously,the stability of the bridge foundation slope considering the united effect of large span and high tower,especially the repeated additional effect of typhoon,is a key problem related that whether the bridge project is tenable.Combining the design place of the bridge foundation,considering engineering load effect,it is found that the position where destabilization will happen most easily is the south slope;and the possibility that the large-scale destabilization happens in other positions of the slope is small.Based on the field geological survey,the boundary conditions controlling the stability of south slope are found.Systematic analysis of the slope stability is conducted under the integrated effects of top structure loads,especially the wind load through many methods.
The main span of Xihoumen Suspension Bridge is 1 650 m,and its main tower(bridge foundation) with height above 200 m lies on an island in the sea.Stratum near the bridge foundation is rhyolite porphyry in late Jurassic period.A little of slope eluvium exists on the top of the mountain,which is 200 m long and 80 m wide,and its all sides face to sea.The integrality of rock mass of the mountain is relatively poor because of the effect of some faults and other structural fissures.Obviously,the stability of the bridge foundation slope considering the united effect of large span and high tower,especially the repeated additional effect of typhoon,is a key problem related that whether the bridge project is tenable.Combining the design place of the bridge foundation,considering engineering load effect,it is found that the position where destabilization will happen most easily is the south slope;and the possibility that the large-scale destabilization happens in other positions of the slope is small.Based on the field geological survey,the boundary conditions controlling the stability of south slope are found.Systematic analysis of the slope stability is conducted under the integrated effects of top structure loads,especially the wind load through many methods.
引文
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[2]赵文,谢强.宜万线野三河大桥桥基位置选择[J].西南交通大学学报,2003,38(1):57–59.(ZHAO Wen,XIE Qiang.Selection of positions for Yesan river bridge foundations in Yichang—Wanzhou railway[J].Journal of Southwest Jiaotong University,2003,38(1):57–59.(in Chinese))
[3]詹志峰,谢强,赵文.峡谷区岩质桥基岸坡稳定性系统分析方法研究[J].四川大学学报(工程科学版),2003,35(6):31–35.(ZHAN Zhifeng,XIE Qiang,ZHAO Wen.Systematic analysis method research on rocky slope stability of bridge foundation in gorge area[J].Journal of Sichuan University(Engineering Science),2003,35(6):31–35.(in Chinese))
[4]冯兆祥.江阴大桥南岸基岩开挖与稳定性分析[C]//1998年全国桥梁学术讨论会论文集.北京:人民交通出版社,1998:157–162.(FENG Zhaoxiang.Analysis of bedrock excavation and stability in the south bank of Jiangyin bridge[C]//Proceedings of the Bridge Science Conference in 1998.Beijing:China Communications Press,1998:157–162.(in Chinese))
[5]MEYERHOF G G.Behavior of piles foundations under special loading conditions:1994 R.M.Hardy keynote address[J].Canadian Geotechnical Journal,1995,32(2):204–222.
[6]朱杰兵,卢桂臣,曾平,等.舟山西堠门跨海大桥基岩工程地质研究[J].人民长江,2005,36(4):25–27.(ZHU Jiebing,LU Guichen,ZENG Ping,et al.Research on main engineering mechanics issues of rock foundation of Xihoumen sea-crossing bridge at Zhoushan[J].Yangtze River,2005,36(4):25–27.(in Chinese))
[7]潘永坚.舟山大陆连岛工程西堠门大桥北塔位天然岩质边坡的稳定性[J].山地学报,2004,22(4):467–471.(PAN Yongjian.Rock-slope stability of Xihoumen bridge foundation in Zhoushan island-mainland link project[J].Journal of Mountain Science,2004,22(4):467–471.(in Chinese))
[8]陈志坚,卓家寿,刘世君.干扰位移法及层状岩质边坡滑动边界的确定[J].岩石力学与工程学报,2000,19(5):630–633.(CHEN Zhijian,ZHUO Jiashou,LIU Shijun.Interference-displacement method and determination of slide boundary of layered rock slope[J].Chinese Journal of Rock Mechanics and Engineering,2000,19(5):630–633.(in Chinese))
[9]《岩土工程手册》编写委员会.岩土工程手册[M].北京:中国建筑工业出版社,1994:690–693.(Compile Commission of Manual of Geotechnical Engineering.Manual of geotechnical engineering[M].Beijing:China Architecture and Building Press,1994:690–693.(in Chinese))
[10]交通部第二公路勘察设计院.公路设计手册——路基[M].北京:人民交通出版社,1996:243–268.(The Second Highway Surveying and Designing Institute of Ministry of Communications.Highway designing manual—roadbed[M].Beijing:China Communications Press,1996:243–268.(in Chinese))
[11]陈蜀俊,党晓英,曾心传,等.奉节长江大桥北岸边坡在地震荷载作用下的稳定性分析[J].岩石力学与工程学报,2004,23(4):657–662.(CHEN Shujun,DANG Xiaoying,ZENG Xinchuan,et al.Seismic stability analysis of slope at north bank of Fengjie Yangtze River bridge[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(4):657–662.(in Chinese))
[12]胡卸文.无泥型软弱层带物理力学特性[M].成都:西南交通大学出版社,2002:71–85.(HU Xiewen.Physico-mechanical characters of no-clay weak interbed[M].Chengdu:Southwest Jiaotong University Press,2002:71–85.(in Chinese))
[13]中华人民共和国国家标准编写组.GB50287–99水利水电工程地质勘察规范[S].北京:中国计划出版社,1999:52–57.(The National Standards Compilation Group of People′s Republic of China.GB50287–99 Code for water resources and hydropower engineering geological investigation[S].Beijing:China Planning Press,19995:2–57.(in Chinese))
[14]陈筠,宋建波.嵌岩抗滑桩设计理论和方法研究[J].贵州工业大学学报(自然科学版),2003,32(5):72–77.(CHEN Jun,SONG Jianbo.Design theory and method research on anti-sliding rock-socket piers[J].Journal of Guizhou University of Technology(Natural Science),2003,32(5):72–77.(in Chinese))
[15]张志明,杨国平.在大水平力作用下嵌岩桩设计计算方法的探讨[J].水运工程,2002,(7):66–68.(ZHANG Zhiming,YANG Guoping.Research on design and calculation methods of rock socketed piles under large horizontal force[J].Port and Waterway Engineering,2002,(7):66–68.(in Chinese))
[16]中华人民共和国行业标准编写组.JGJ94–94建筑桩基技术规范[S].北京:中国建筑工业出版社,1995:26–44.(The Professional Standards Compilation Group of People′s Republic of China.JGJ94–94 Technical code for building pile foundations[S].Beijing:China Architecture and Building Press,1995:26–44.(in Chinese))
[17]中华人民共和国行业标准编写组.JTJ024–85公路桥涵地基与基础设计规范[S].北京:人民交通出版社,2002:16–36.(The Professional Standards Compilation Group of People′s Republic of China.JTJ024–85 Specifications for design of ground base and foundation of highway bridges and culverts[S].Beijing:China Communications Press,2002:16–36.(in Chinese))
[18]丁秀丽,付敬,张奇华.奉节南桥头三峡水库水位涨落条件下滑坡稳定性分析[J].岩石力学与工程学报,2004,23(17):2 913–2 919.(DING Xiuli,FU Jing,ZHANG Qihua.Stability analysis of landslide in the south end of Fengjie highway bridge with fluctuation of water level of the Three Gorges Reservoir[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(17):2 913–2 919.(in Chinese))
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