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IN-SITU TEST RESEARCH ON UPLIFT BEARING CAPACITY OF SCREWANCHOR IN SOFT GROUND OF MIRE AREA
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摘要: 输电杆塔螺旋锚基础常用于软土地基，为揭示泥沼软土原状地基螺旋锚抗拔承载性能，开展了不同锚盘直径、埋深、锚盘间距的螺旋锚原位抗拔载荷试验，得到了单锚基础荷载与位移关系曲线及其抗拔极限承载力，分析了泥沼软土地基螺旋锚抗拔承载特性，以及锚盘直径、盘个数、埋深、持力层性质对螺旋锚抗拔承载性能的影响，结果表明：软土地基中，螺旋锚荷载与位移关系曲线临塑荷载较小且塑性变形阶段较长；锚盘直径越大、个数越多则承载力越高；当相邻锚盘间距与锚盘直径之比大于2.0时，同一螺旋锚的锚盘之间抗拔承载性能的相互影响可忽略；锚盘持力层性质对螺旋锚抗拔承载力的影响比埋深更明显。Abstract: Soft ground is one of common applicable conditions of transmission tower screw anchor foundation. In order to understand the uplift bearing capacity of screw anchor in soft soil, in-situ uplift loading tests of screw anchors with different diameters, depths and spacings of anchor plates were carried out. The load-displacement relationship curve and ultimate uplift bearing capacity of single anchor foundation were obtained, and the uplift resistance of screw anchor in mud soft soil was analyzed,as well as the effects of diameter, number, depth, and bearing layer properties of anchor plate on the uplift bearing capacity of screw anchor. The results showed that the relationship between load and displacement of screw anchors in soft ground had smaller plastic load and longer plastic deformation stage; the larger the diameter of anchor plate and the more anchor plates, the higher the bearing capacity; when the ratio of the distance between adjacent anchor plates to the diameter of anchor plate was larger than 2.0, the interaction of a screw anchor between the anchor plates could be neglected, and the effect of the anchor plate bearing layer on the uplift bearing capacity of the screw anchor was more obvious than that of the buried depth.
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Key words:
- soft ground /
- screw anchor /
- uplift bearing capacity /
- bearing performance
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