摘要
螺旋锚具有安装方便快捷、承载性能可靠且可重复利用等优点,广泛应用于输电线路塔基基础和光伏板结构的基础工程中;然而,目前针对软土地基中螺旋锚在上拔荷载下锚周土体受力变形破坏模式的研究仍相对较少。基于卡波姆U10材料配制的透明黏土和PIV数字图像处理技术,开展软土地基中单叶、双叶螺旋锚在竖向上拔荷载下锚周土体的位移场可视化模型试验研究,对比常规等截面锚杆在上拔荷载下锚周土体的位移场,初步分析了螺旋叶片对锚周土体位移场的影响,探讨了叶片间距对螺旋锚受力变形破坏模式的影响。试验结果表明,本文试验条件下,螺旋叶片的存在会明显扩大锚的受力影响区域,水平方向的最大影响范围约为常规锚的1.8倍;叶片间距在1d与3d时分别表现出圆柱面整体剪切模式和单叶片叠加模式。
Helical screw anchor is very popular as the foundation of transmission towers and photovoltaic stents because of its fast and convenient installation,reliable bearing performance and reusable utilization.However,there is little literature focused on failure mode of screw anchor,especially embedded in soft clay.Based on carbopol U10 mmaterial and PIV technique,visual model tests on the failure mechanism of single-helix and double-helix screw anchors embedded in transparent soft clay under tensile load were conducted.The influences of the helix and the distance between helix on the displacement of the soils around screw anchors were preliminarily analyzed.The test results show that the existence of helix will obviously expand the influenced area of the soils.The maximum influence range of the soils around single-helix screw anchor in horizontal direction is about 1.8 times that of conventional anchor.The performance of the double-helix with distance between the helix at 1 d and 3 d could be consistent with the cylindrical shear method and individual method,respectively.
作者
张天忠
邵先锋
计策
王梦博
Zhang Tianzhong;Shao Xianfeng;Ji Ce;Wang Mengbo(State Grid Anhui Electric Power Company,Hefei 230061,P.R.China;State Grid Anhui Electric Power Company Construction Branch,Hefei 230071,P.R.China;Anhui Huadian Engineering Consultating&Design Co.,Ltd.,Hefei 230022,P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2020年第S02期569-575,共7页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金(51478156)
国家电网安徽省电力公司资助项目(2018-keji015)
关键词
螺旋锚
透明黏土
破坏机理
模型试验
screw anchor
transparent clay
failure mechanism
model test
