黏性土地基螺旋锚基础上拔承载性能试验和有限元分析  

Test and finite element analysis of uplift bearing capacity of spiral anchor foundation on cohesive soil foundation

作　　者：刘永宽 张楷 王树峰 李红旭 焦利欣 Liu Yongkuan;Zhang Kai;Wang Shufeng;Li Hongxu;Jiao Lixin(Cangzhou Power Supply Branch,State Grid Hebei Electric Power Co.,Ltd.,Cangzhou 061000,China;PowerChina Hebei Electric Power Design&Research Institute Co.,Ltd.,Shijiazhuang 050021,China)

机构地区：[1]国网河北省电力有限公司沧州供电分公司,河北沧州061000 [2]中国电建集团河北省电力勘测设计研究院有限公司,河北石家庄050021

出　　处：《能源与环保》2023年第4期295-300,305,共7页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

基　　金：国家电网公司基建依托新技术科技项目(GCB11202002122)。

摘　　要：为了研究黏性土中螺旋锚受竖向上拔荷载的承载性能,基于现场静载试验,建立螺旋锚有限元模型分析,与试验结果进行对比分析;基于验证的有限元模型,研究分析了埋深比与锚片间距对螺旋锚的上拔承载性能的影响。研究结果表明,在黏性土中,对于单锚片螺旋锚,当埋深比H/D<3时,随埋深比的增加螺旋锚抗拔承载力逐渐增强,增加的趋势逐渐放缓;当埋深比H/D≥4时,埋深比对螺旋锚抗拔承载力的影响可忽略不计。对于多锚片螺旋锚,锚片间距h/D<3时,锚片间距的相互影响较为明显;当锚片间距h/D≥3时,锚片承载性能可发挥90%以上。In order to study the bearing performance of screw anchor under vertical uplift load in cohesive soil,based on the field static load test,the finite element model of screw anchor is established and compared with the test results.Based on the verified finite element model,the effects of buried depth ratio and anchor spacing on the uplift bearing performance of spiral anchor are studied and analyzed.The results show that in cohesive soil,for single anchor spiral anchors,when the buried depth ratio H/D is less than 3,the pull-out bearing capacity of spiral anchor increases gradually with the increase of buried depth ratio,and the increasing trend slows down gradually.When the buried depth ratio H/D is≥4,the influence of buried depth ratio on the pull-out bearing capacity of spiral anchor can be ignored.For multi blade spiral anchors,when the spacing h/D of anchor blades is less than 3,the interaction between the spacing of anchor blades is more obvious.When the spacing h/D≥3,the bearing performance of anchor blades can play more than 90%.

关 键 词：螺旋锚 上拔承载性能 静载试验 数值模拟 

分 类 号：TU432[建筑科学—岩土工程]