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Experimental study on the long-term horizontal bearing characteristics of suction caisson foundation

ZHU Wenbo;DAI Guoliang;YUAN Longjing;GONG Weiming;ZHAO Xueliang;School of Civil Engineering,Southeast University;Key Laboratory of Concrete and Prestressed Concrete Structure of Ministry of Education,Southeast University;  
Two long-term model tests of different horizontal loads were performed to study the time-dependent suction caisson displacement and the time-dependent soil pressure distribution. The results indicate that the displacements are mainly developed in the earlier stages and then require a longer time to stabilize in the later stages,hence the soil rheological effect is more obvious. The earth pressure distribution curve along the depth shows a parabolic shape,which means that the caisson presents a rotation mode under horizontal load. Passive soil pressure shows an upward trend along with time,while an downward trend is presented in active soil pressure. And soil pressure development mainly concentrates in the early stage of the test,later soil pressure change is relatively small,but the soil pressure stability requires a longer time,and the greater the load value is,the longer the stability of soil pressure will be.
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