登录
注册
E-alert
登录
注册
E-alert
IN-SITU TEST RESEARCH ON UPLIFT BEARING CAPACITY OF SCREWANCHOR IN SOFT GROUND OF MIRE AREA
-
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.
-
Key words:
- soft ground /
- screw anchor /
- uplift bearing capacity /
- bearing performance
-
汪滨. 螺旋锚技术及其在工程中的应用[M]. 北京:中国水利水电出版社, 2005. 张昕. 螺旋锚锚周土体变形试验与抗拔承载力计算模型研究[D]. 郑州:郑州大学,2014. 张文涛.螺旋锚复合基础在软土地基中的应用[J].吉林电力,2015,43(1):38-40. 詹金林.螺旋锚技术在静载试验测试工程中的应用[J].土工基础,2012,26(1):63-66. 丁佩民, 肖志斌, 裘涛. 张拉索膜结构锚板基础设计理论研究[J]. 工业建筑, 2004, 34(4):49-52. 李广信,汤飞. DX桩承力盘抗拔阻力的分析与研究[J]. 工业建筑, 2005,35(6):52-55,60. JOHNSTON G H, LADANYI B. Field Tests of Deep Power-Installed Screw Anchors in Permafrost[J]. Canadian Geotechnical Journal, 1974, 11(3):348-358. MERIFIELD R S. Ultimate Uplift Capacity of Multiplate Helical Type Anchors in Clay[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2011, 137(7):704-716. 郝冬雪, 陈榕, 符胜男. 砂土中螺旋锚上拔承载特性模型试验研究[J]. 岩土工程学报, 2015, 37(1):126-132. 王杰, 孙海峰, 杜秋男, 等. 双锚片螺旋锚极限抗拔承载力研究[J]. 沈阳建筑大学学报(自然科学版), 2008(1):54-57. 胡伟,刘顺凯,张亚惠,等. 单叶片全尺寸螺旋锚桩竖向拉拔试验研究[J]. 土木建筑与环境工程, 2017, 39(5):31-39. MORS H. Behavior of Pole Foundations Under Srain Stresses Das Verhalten von Mastgruendungen bei Zugbeanspruchung[J]. Bautechnik, 1959,36(10):367-378. GHALY A, HANNA A. Uplift Behavior of Screw Anchors in Sand.I:Dry Sand[J]. Journal of Geotechnical Engineering, 1991, 117(5):773-793. LI Y. Compressive Behavior of Grouted Helical Foundations[D]. New York:Syracuse University, 2007. KULHAWY F H. Uplift Behavior of Shallow Soil Anchors:An Overview[C]//ASCE, USA. 1985. -
点击查看大图
计量
- 文章访问数: 98
- HTML全文浏览量: 12
- PDF下载量: 2
- 被引次数: 0
下载:
