桥梁桩基被动式托换体系承载特性模型试验研究
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摘要
以兰州地铁烂泥沟桥桩基托换工程为依托,通过室内模型试验模拟施工过程,研究桩基托换过程中既有桩与托换桩桩身轴力变化情况及桩的承载特性。结果表明:托换后既有桩轴力先增大减小,既有桩桩身轴力在承台下方桩身长度1/8范围内衰减较大。试验结果对实际工程施工有一定的参考价值。
Taking pile foundation underpinning engineering of Lannigou bridge in Lanzhou Metro as an example,construction process was simulated through indoor model tests,and the axial force change of the existing piles and the underpinning piles and the bearing characteristics of piles were studied in the process of pile foundation underpinning.The results show that the axial force of the existing pile increases first and then decreases after underpinning,and the attenuation of existing pile axial force is great in the range of one-eighth of the pile length underneath the cushion cap.The test results have certain reference value for actual engineering construction.
Taking pile foundation underpinning engineering of Lannigou bridge in Lanzhou Metro as an example,construction process was simulated through indoor model tests,and the axial force change of the existing piles and the underpinning piles and the bearing characteristics of piles were studied in the process of pile foundation underpinning.The results show that the axial force of the existing pile increases first and then decreases after underpinning,and the attenuation of existing pile axial force is great in the range of one-eighth of the pile length underneath the cushion cap.The test results have certain reference value for actual engineering construction.
引文
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[2]叶书麟,韩杰.托换技术综述[C]//中国土木工程学会.第三届全国地基处理学术讨论会论文集.秦皇岛:研讨会组委会,1992:43-50.
[3]唐新权.地铁区间隧道下穿桥梁大轴力桩基托换设计与施工[J].铁道标准设计,2016,60(1):87-91.
[4]周冠南,周顺华,候刚,等.邻近盾构施工中的桩基托换效果研究[J].地下空间与工程学报,2010,6(4):803-809.
[5]金方方,徐前卫,马忠政,等.桥梁下方桩基托换过程中开挖暴露长度研究[J].地下空间与工程学报,2012,8(2):396-403.
[6]MASUDA Y,MINDSHIMA T,MAKIND H.Large-scale Underpinning for an Underground Urban Railway Station[J].Tunneling and Underground Space Technology,1992,7(2):133-140.
[7]MAKARCHIAN M,POULOS H G.Simplified Method for Design of Underpinning Piles[J].Journal of Geotechnical Engineering,1996,122(9):745-751.
[8]CHOW Y K.Analysis of Vertically Loaded Pile Groups[J].International Journal for Numercial and Analytical Methods in Geomedanics,1986,10(1):59-72.
[9]殷红伟,黄志军,董建刚.桩基托换在广州地铁三号线中的应用[J].山西建筑,2005,31(12):91-92.
[10]张正瑞.深厚湿陷性黄土地区路基侧向防渗新结构模型试验研究[D].兰州:兰州交通大学,2015.
[11]中华人民共和国住房和城乡建设部.JGJ 106-2014建筑基桩检测技术规范[S].北京:中国建筑工业出版社,2014.