中粗砂中裙式吸力基础位移控制式加载试验  

Displacement-controlled Loading Tests of the Skirted Suction Foundation in Medium-coarse Sand

作　　者：李珊珊[1,2] 李大勇[1,2] 郭彦雪[1,2] 

机构地区：[1]山东科技大学山东省土木工程防灾减灾重点实验室,山东青岛266590 [2]山东科技大学土木建筑学院,山东青岛266590

出　　处：《山东科技大学学报（自然科学版）》2013年第4期11-15,51,共6页Journal of Shandong University of Science and Technology(Natural Science)

基　　金：国家自然科学基金项目(51078227);山东省自然科学基金项目(ZR2009FM003);教育部留学回国人员科研启动基金项目;山东科技大学研究生科技创新基金(YCB120127)

摘　　要：裙式吸力基础是一种新兴的海洋基础形式,可显著提高水平承载能力并限制上部结构在较大水平荷载作用下的侧移量,更适用于海上风力发电基础。通过饱和中粗砂土地基中裙式吸力基础的位移控制式水平单调加载试验,探究了裙结构对基础承载力的影响。试验表明:与荷载控制式加载相比,位移控制式加载所得荷载-位移关系曲线后期呈软化状态;与传统吸力基础相比,裙式吸力基础承载力随着裙高、裙宽的增加而显著增加,提高幅度为10.9%～39.7%;相比传统吸力基础,极限状态下裙式吸力基础的水平侧移量明显减小,水平侧移的减小幅度为4.68%～60.42%。The skirted suction caisson,as a novel type foundation,may increase the horizontal bearing capacity and reduce the deflection to some extent and it is very suitable for offshore wind turbines. Effects of the ＂skirted＂ struc- ture on lateral bearing capacity were investigated by using model tests conducted in saturated medium-coarse sand under displacement-controlled loading, with a series of load-displacement curves obtained. Test results show that load-displacement curves captured under displacement-controlled loading are in softening condition compared with weight-controlled loading. Moreover, the lateral bearing capacity of the skirt suction caissons increases by 10.9%- 39. 7 % compared with the traditional caisson,and it increases with increasing length and width of the skirted structure. And the lateral deflection of the skirt suction caissons decreases by 4.68 % - 60.42 % compared with the traditional caisson.

关 键 词：裙式桶形基础 中粗砂 位移控制式加载 水平承载力 

分 类 号：TU435[建筑科学—岩土工程]