深水超长钢板桩围堰受力特性分析
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摘要
以芒稻河特大桥主墩深水超长钢板桩围堰为例,考虑钢板桩与地基土、内撑、回填物的相互作用,利用ABAQUS软件建立平面有限元接触模型,通过单元"生死"和位移追踪技术,进行施工全过程仿真模拟,分析围堰受力变形特性。研究表明:基坑开挖完成后,桩后土压力呈R形分布,入土段下部弹性嵌固作用明显。封底砼顶部在抽水后、冠梁在拆撑过程中有显著的支承作用。钢板桩弯矩在第二道内撑拆除后最大,底撑在抽水后反力最大,其他各道内撑分别在下一道内撑拆除后反力最大。各道围檩最大挠度接近,内撑竖向布置和构件设计合理。
Taking the super-long steel sheet pile cofferdam of the main pier of the Mangdao River super-large bridge as an example, taking the interaction between the steel sheet pile and the foundation soil, the inner support and the backfill, ABAQUS was used to establish the plane finite element contact model. The whole process simulation was carried out by means of "life and death" and displacement tracking technology, then the mechanical characteristic of cofferdam was analyzed. The research shows that after the foundation pit is completed, the earth pressure behind the pile is R shaped, and the effect of elastic embedding on the lower part of the soil section is obvious. The top of the cover concrete after pumping and the crown beam in the process of support removing have significant support effect. The bending moment of steel sheet pile is the largest after second support dismantling and the reverse force of the bottom support is the greatest after pumping, the reverse forces of the other supports are also the maximum after the next support is removed. The maximum deflection of the enclosing purlin is close to each other, the vertical arrangement of the supports and the design of the construction members are reasonable.
Taking the super-long steel sheet pile cofferdam of the main pier of the Mangdao River super-large bridge as an example, taking the interaction between the steel sheet pile and the foundation soil, the inner support and the backfill, ABAQUS was used to establish the plane finite element contact model. The whole process simulation was carried out by means of "life and death" and displacement tracking technology, then the mechanical characteristic of cofferdam was analyzed. The research shows that after the foundation pit is completed, the earth pressure behind the pile is R shaped, and the effect of elastic embedding on the lower part of the soil section is obvious. The top of the cover concrete after pumping and the crown beam in the process of support removing have significant support effect. The bending moment of steel sheet pile is the largest after second support dismantling and the reverse force of the bottom support is the greatest after pumping, the reverse forces of the other supports are also the maximum after the next support is removed. The maximum deflection of the enclosing purlin is close to each other, the vertical arrangement of the supports and the design of the construction members are reasonable.
引文
[1]何良德,彭天驰,李元青,等.翻车机房圆形基坑支护结构受力特性分析[J].水道港口,2018,39(1):89-95.HE L D,PENG T C,LI Y Q,et al.Characteristic analysis on retaining structure of cylindrical foundation pit of dumper shed[J].Journal of Waterway and Harbor,2018,39(1):89-95.
[2]刘国彬,王卫东.基坑工程手册[M].北京:中国建筑工业出版社,2009.
[3]尹铁锋,顾其波,高京生,等.基坑施工对地铁隧道影响的模拟分析[J].水道港口,2017,38(3):291-298.YIN T F,GU Q B,GAO J S,et al.Numerical modeling analysis of influence on metro tunnels due to excavation of foundation pit[J].Journal of Waterway and Harbor,2017,38(3):291-298.
[4]张成君.深水基础钢板桩围堰施工动态仿真技术研究[D].南京:河海大学,2018.
[5]贺炜,李传习.考虑施工过程的深水钢板桩围堰有限元计算分析[J].公路与汽运,2009(3):160-163.HE W,LI C X.Finite element calculation and analysis of deep water steel sheet pile cofferdam considering construction process[J].Road and freight transportation,2009(3):160-163.
[6]汤劲松,熊保林.钢板桩围堰设计的土压力计算方法探讨[J].岩土工程学报,2014,36(s2):36-41.TANG J S,XIONG B L.Discussion on calculation method of earth pressure for steel sheet pile cofferdam design[J].Journal of geotechnical engineering,2014,36(s2):36-41.
[7]徐彪,刘佳.对深基坑坑底隆起问题的探讨[J].广西工学院学报,2004,15(1):66-68.XU B,LIU J.An inquiry into the problem of upheaval in the bottom of the deep foundation pit[J].Journal of Guangxi University of Technology,2004,15( 1):66-68.
[8]蔡正银,侯伟.单锚板桩结构的工作机理研究[J].岩土工程学报,2015,37(1):29-34.CAI Z Y,HOU W.Mechanism of sheet-pile structure with a single anchorage[J].Journal of geotechnical engineering,2015,37(1):29-34.
[9]杨光华.深基坑支护结构的实用计算方法及其应用[J].岩土力学,2004,25(12):1 885-1 896.YANG G H.Practical calculation method of retaining structures for deep excavations and its application[J].Geotechnical Mechanics,2004,25(12):1 885-1 896.
[2]刘国彬,王卫东.基坑工程手册[M].北京:中国建筑工业出版社,2009.
[3]尹铁锋,顾其波,高京生,等.基坑施工对地铁隧道影响的模拟分析[J].水道港口,2017,38(3):291-298.YIN T F,GU Q B,GAO J S,et al.Numerical modeling analysis of influence on metro tunnels due to excavation of foundation pit[J].Journal of Waterway and Harbor,2017,38(3):291-298.
[4]张成君.深水基础钢板桩围堰施工动态仿真技术研究[D].南京:河海大学,2018.
[5]贺炜,李传习.考虑施工过程的深水钢板桩围堰有限元计算分析[J].公路与汽运,2009(3):160-163.HE W,LI C X.Finite element calculation and analysis of deep water steel sheet pile cofferdam considering construction process[J].Road and freight transportation,2009(3):160-163.
[6]汤劲松,熊保林.钢板桩围堰设计的土压力计算方法探讨[J].岩土工程学报,2014,36(s2):36-41.TANG J S,XIONG B L.Discussion on calculation method of earth pressure for steel sheet pile cofferdam design[J].Journal of geotechnical engineering,2014,36(s2):36-41.
[7]徐彪,刘佳.对深基坑坑底隆起问题的探讨[J].广西工学院学报,2004,15(1):66-68.XU B,LIU J.An inquiry into the problem of upheaval in the bottom of the deep foundation pit[J].Journal of Guangxi University of Technology,2004,15( 1):66-68.
[8]蔡正银,侯伟.单锚板桩结构的工作机理研究[J].岩土工程学报,2015,37(1):29-34.CAI Z Y,HOU W.Mechanism of sheet-pile structure with a single anchorage[J].Journal of geotechnical engineering,2015,37(1):29-34.
[9]杨光华.深基坑支护结构的实用计算方法及其应用[J].岩土力学,2004,25(12):1 885-1 896.YANG G H.Practical calculation method of retaining structures for deep excavations and its application[J].Geotechnical Mechanics,2004,25(12):1 885-1 896.