Experimental Study on Pull-Out Resistance Properties of Suction Anchors in Sandy Soil
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摘要: 为揭示砂土地基中吸力锚在拉拔荷载作用下的响应机理,通过室内物理模型试验对砂土中吸力锚基础的承载特性进行研究。制备了长径比分别为0.5、0.8、1.0、1.5、2.0的5种不同尺寸的吸力锚基础模型,探究不同锚固点位置、加载角度对其承载特性的影响。试验表明:在加载角小于60°情况下,不同长径比吸力锚可能产生前倾转动破坏、后仰转动破坏和平移滑动破坏等失稳机制;吸力锚基础抗拔承载力随着加载角度的增大而降低;对于长径比小于1的吸力锚,其最优锚固点基本位于筒壁中点,而长径比大于1时,其最优锚固点位置出现下移,大约位于筒壁埋深的70%处。Abstract: The response of suction anchors subjected to inclined uplift loading in sand foundation is not clear. The bearing properties of suction anchors in sand foundation was studied through a series of model tests. Five suction anchor models with the aspect ratio of 0.5, 0.8, 1.0, 1.5 and 2.0 were prepared to explore the effects of loading positions and load inclination angles on their bearing characteristics. The test results show that suction anchors with various aspect ratios might produce instability mechanisms such as forward rotation failure, backward rotation failure and sliding failure when the load inclination angle was less than 60°. The pull-out capacity of suction anchors decreased with the increase of load inclination angle. For suction anchors with an aspect ratio less than 1, the optimal anchoring point is located at the middle point of the skirt wall, while for suction anchors with an aspect ratio greater than 1, the optimal anchoring point moved down to about 70% of the buried depth of the skirt wall.
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Key words:
- sand /
- suction anchor /
- bearing property /
- model test /
- failure mechanism
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