Model tests on a caisson-pile composite foundation in sand subjected to lateral static and cyclic loadings
-
摘要: 采用自主设计的水平循环加载装置进行模型试验研究,探讨了水平静力及循环加载下单体沉井及沉井加桩复合基础承载变形性能。试验研究表明：与单体沉井基础相比,沉井加桩复合基础的水平刚度耦合了沉井及群桩刚度,改善了水平荷载作用下基础的位移响应模式,其水平承载力明显高于单体沉井基础。水平双向对称循环加载后,基础的水平刚度、承载力均有所提高,并且循环加载后沉井加桩复合基础的承载力高于单体沉井基础。因此,针对水平循环加载而言,沉井加桩复合基础是一种更为有效的基础形式。Abstract: Model tests are carried out using a lateral cyclic loading rig developed by the authors in order to investigate the bearing capacity and deformation characteristics of a simple caisson foundation and a caisson-pile composite foundation in sand under lateral static and cyclic loadings. Test results reveal that the lateral stiffness of the caisson-pile composite foundation couples the stiffnesses of caisson and group piles compared with that of the simple caisson foundation, and it improves the deformation response of the foundation under lateral loading. The bearing capacity of the caisson-pile composite foundations is significantly higher than that of the simple caisson foundation. Meanwhile, the lateral stiffness and bearing capacity of foundation increase after the application of lateral bidirectional and symmetric cyclic loading, and the bearing capacity of the caisson-pile composite foundations is higher than that of the simple caisson foundation after cyclic loading. The caisson-pile composite foundation is a more effective solution to increase the capability of the foundation in resisting the lateral cyclic loading.
-
Keywords:
- model test /
- caisson-pile composite foundation /
- lateral cyclic loading /
- sand
-
[1] SEKIGUCHI H, OHMAKI S. Overturning of caissons by storm waves[J]. Soils and Foundations, 1992, 32(3): 144-155. [2] 陈晓平, 茜平一, 张志勇. 沉井基础下沉阻力分布特征研究[J].岩土工程学报, 2005, 27(2): 148-152. (CHEN Xiao-ping, QIAN Ping-yi, ZHANG Zhi-yong. Study on penetration resistance distribution characteristic of sunk shaft foundation[J]. Chinese Journal of Geotechnical Engineering, 2005, 27(2): 148-152. (in Chinese)) [3] 李伟雄. 基于被动土压力的沉井结构分析[J]. 岩土工程学报, 2005, 27(11): 1341-1345. (LI Wei-xiong. Analysis of structure of passive earth pressure on open caisson[J]. Chinese Journal of Geotechnical Engineering, 2005, 27(11): 1341-1345. (in Chinese)) [4] 穆保岗, 朱建民, 牛亚洲. 南京长江四桥北锚碇沉井监控方案及成果分析[J].岩土工程学报, 2011, 33(2): 269-274. (MU Bao-gang, ZHU Jian-min, NIU Ya-zhou. Monitoring and analysis of north anchorage caisson of Fourth Nanjing Yangtze River Bridge[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(2): 269-274. (in Chinese)) [5] 王 建, 刘 杨, 张 煜. 沉井侧壁摩阻力室内试验研究[J]. 岩土力学, 2013, 34(3): 659-666. (WANG Jian, LIU Yang, ZHANG Yu. Model test on sidewall friction of open caisson[J]. Rock and Soil Mechanics, 2013, 34(3): 659-666. (in Chinese)) [6] ZHANG X Y, LEE F H, LEUNG C F. Response of caisson breakwater subjected to repeated impulsive loading[J]. Geotechnique, 2009, 59(1): 3-16. [7] LEBLANC C, HOULSBY G Y, BYRNE B W. Response of stiff piles in sand to long-term cyclic lateral loading[J]. Géotechnique, 2010, 60(2): 79-90. [8] ZHU B, BYRNE B W, HOULSBY G T. Long-term lateral cyclic response of suction caisson foundations in sand[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2013, 139: 73-83.
计量
- 文章访问数:
- HTML全文浏览量: 0
- PDF下载量:
下载:
