Model tests on a caisson-pile composite foundation in sand subjected to lateral static and cyclic loadings
ZHANG Xun1, 2, HUANG Mao-song1, 2
1. Key Laboratory of Geotechnical and Underground Engineering of the Ministy of Education, Tongji University, Shanghai 200092, China; 2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China
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.
张勋, 黄茂松. 砂土中沉井加桩复合基础水平静力及循环模型试验[J]. 岩土工程学报, 2015, 37(zk2): 121-124.
ZHANG Xun, HUANG Mao-song. Model tests on a caisson-pile composite foundation in sand subjected to lateral static and cyclic loadings. Chinese J. Geot. Eng., 2015, 37(zk2): 121-124.
[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.
