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《Chinese Journal of Underground Space and Engineering》 2017-03
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The influences of Scouring on the Caisson-piles Composite Foundation under Lateral Cyclic Loading

Tang Huawei;Zhang Chenrong;Gao Bolei;Key Laboratory of Geotechnical and Underground Engineering of the Ministry of the Education,Tongji University;Department of Geotechnical Engineering,Tongji University;China Merchants Shekou Industrial Zone Holdings Co.,Ltd;  
As the common foundation of the large bridge in deep water area,the stability of caisson-piles composite foundation is directly related to the safety of the bridge.To investigate the influences of scouring on the lateral bearing capacity and the horizontal stiffness of hysteresis loop of the composite foundation in sand under cyclic loading,the static loading test and post-cyclic test were carried out for the caisson-piles composite foundation.Finally,lateral load-displacement curves and cyclic hysteresis loops were obtained from the test.The test results show that scouring obviously reduces the lateral loading capacity of the foundation.For the current sand with intermediate density and low confining pressure,cyclic loading can increase the lateral loading capacity of the foundation.By comparing the post-cyclic load-displacement curves,the lateral bearing capacity under scouring is less than that free of scour.For cyclic curves,the horizontal stiffness of hysteresis loop under scouring is less than that free of scour,which grows slowly with increased cyclic number,and gradually becomes stabilized.
【Key Words】: model test scour cyclic lateral loading caisson-piles composite foundation sand
【Fund】: 国家973计划课题(2013CB036304);; 国家自然科学基金(51378392)
【CateGory Index】: TU473.1
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