动力锚在斜坡地基上的沉贯特性

Dynamic penetration performance of dynamically installed anchor on slope foundation

水上浮式结构都需要锚固基础来定位。动力锚依靠重力以自由落体的方式安装,是一种自安装锚固基础,具有安装过程简单高效的优点。通过1g模型试验研究了自行研制开发的板型动力锚在斜坡地基上的沉贯过程,分别考虑了基床坡度、锚柄方位和贯入速度对锚最终偏角的影响。结果表明:基床的坡度越大,锚的最终偏角也越大,但基床坡度对动力锚最终偏角影响有限,对动力锚的安装和承载能力影响较小。当贯入速度相同时,锚柄平行坡面时锚的最终偏角最小,锚柄指向坡外时锚的最终偏角最大;当基床坡度相同时,锚的贯入速度越大,锚的最终偏角越小。

Floating structures are located by anchors. The dynamically installed anchor(DIA) is a self-installed anchor which is installed by free fall through its gravity. The DIA owns advantages of simple and efficient installation. In this paper, the penetration process of a Light-Weight Gravity Installed Plate Anchor(L-GIPLA), which is a self-designed anchor type, on slope foundations is studied by 1g model test. The influences of the slope angle of the foundation, orientation of the anchor shank, and impact velocity on the final inclined angle of the anchor are investigated respectively. The results show that the final inclined angle of the anchor increases with the increase of the slope angle of the foundation. However, the influence of the slope angle of the foundation on the final inclined angle of the anchor is limited, hence the installation performance and holding capacity of the anchor are less affected by the slope angle. With the same impact velocity, the final inclined angle of the anchor is the smallest when the shank orientation is parallel to the slope surface, while the final inclined angle is the largest when the shank points to the outside of the slope. With the same slop angle, the final inclined angle of the anchor experiences a reduction with increasing impact velocities.