吸力式沉箱基础长期水平荷载作用下承载特性试验研究

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

通过两组不同水平荷载作用下吸力式沉箱基础长期模型试验,对吸力式沉箱基础随时间的位移变化规律以及土压力分布规律进行了研究。试验结果表明:在长期模型试验中位移发展主要集中在试验前期,后期位移稳定需要更长时间,土体流变效应较为明显。土压力沿深度分布曲线呈抛物形状,表明沉箱基础在水平荷载作用下为转动模式,随时间增加被动区土压力变化呈增大趋势,主动区土压力呈减小趋势。土压力发展主要集中在试验前期,后期土压力变化相对较小,但土压力稳定所需时间较长,同时荷载值越大土压力稳定所需时间越长。

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.