垂向动载荷下桶形基础响应实验研究  

Experimental study on the bucket foundation responses under vertical vibration load

作　　者：矫滨田[1,2] 鲁晓兵[1] 张建红[3] 时忠民[2] 

机构地区：[1]中国科学院力学研究所,北京100080 [2]中国海洋石油总公司研究中心,北京100027 [3]清华大学水利系,北京100080

出　　处：《海洋工程》2009年第3期45-53,共9页The Ocean Engineering

基　　金：中国科学院;中海油联合重大资助项目(KJCX2-SW-L03-01);中科院创新方向性资助项目(KJCX2-YW-L02)

摘　　要：对垂向动载荷作用下吸力式桶形基础(简称桶基)响应进行离心机实验模拟。结果表明,在垂向动载荷作用下,当载荷幅值超过一定值时,桶基周围砂土软化甚至液化,发生明显的沉降。桶基周围土体的沉降随着载荷幅值的增加而增加。由于液化区的滤波和对动载的衰减作用,发生沉降的范围有限,离桶壁约一倍桶高距离。超孔隙水压从桶基边沿水平向逐渐衰减,从土面开始往下逐渐衰减到零。桶基周围砂土完全液化的厚度随载荷幅值的增加而增加,最大值约为桶高的40%。The dynamic responses of suction bucket foundations under vertical vibration are experimentally studied. The results show that the sand layer surrounding the bucket foundation softens or even liquefies under vertical dynamic load. Obvious settlement of sand layer occurs when the load amplitude is over a critical value. With the increase of load amplitude, the settlement of sand layer increases, but the affected area whieh has obvious deformation is limited （about one time of the bucket＇s height） because of the filtering and decaying effects of the liquefaction area on the vibration. The excess pore pressure decreases in horizontal direction from the side wall and in vertical direction from the surface of sand layer. The complete liquefaction thickness of the sand layer increases with the increase of load amplitude whose maximum is about 40% of the bucket＇s heigth.

关 键 词：饱和砂土 离心机实验 沉降 垂向动载荷 液化 桶形基础 

分 类 号：TE319[石油与天然气工程—油气田开发工程]