波浪荷载下砂质海床液化抑制的试验研究

Laboratory Research on Sandy Deposit Liquefaction Suppression Under Wave Loading

在波浪荷载作用下,砂质海床往往会由于海床液化最终导致海床的整体失稳,而海床整体失稳的发生将对其上部承载结构物(近海风机、石油平台等)的稳定性产生严重影响。为控制海床液化的影响,大量学者采用解析、数值和现场试验方法对分层海床的海床响应及液化抑制问题进行了研究,但相关的室内试验研究仍处于起步阶段。为进一步完善海床液化相关试验规律及数据,本文采用一维圆筒试验设备对波浪荷载下砂质海床的响应和液化抑制问题进行了试验研究,发现当替换一部分海床为液化保护层后,海床的液化会被极大地抑制,而当替换的液化保护层厚度达到海床总高度的10%以后,海床将完全不发生液化现象。

For sandy seabed,seabed overall instability are always caused by the wave-induced seabed liquefaction,which will have serious impact on the stability of the structures(offshore wind turbines,oil platforms)upper the seabed.To control the influence of seabed liquefaction,large number of scholars have investigated the wave-induced layered seabed response and liquefaction suppression with analytical and numerical methods,while related experimental research are still in its infancy.To further improve the related test rule and data,the study used one-dimensional cylinder experimental equipment to study the sandy deposit response and liquefaction suppression under wave loading,and found that when replace part of the seabed as liquefied protective layer,seabed liquefaction would greatly suppressed;when the thickness of liquefied protective layer reach10%,seabed liquefaction phenomenon would not occur.