摘要
为解决普通螺旋锚复合地基(普通锚地基)的水平承载力和刚度相对较弱问题,提出了一种新型大小螺旋锚组合式复合地基(组合锚地基),并研究其在水平单调递增荷载作用下的破坏形式和承载能力及刚度,以明确其基本力学性能和主要影响因素。首先,对一组典型的组合锚地基进行现场水平循环加载试验,并将试验结果用于验证有限元模型的有效性;然后,论述了普通锚地基水平承载能力及主要影响因素;最后,利用有限元分析方法分别对组合锚地基和普通锚地基进行了不同工况下的水平单调加载全过程分析。结果表明:在达到承载力极限状态时,底部锚盘上部土体率先发生局部剪切破坏,此时的锚盘和锚杆材料均处于弹性状态;与普通锚地基相比,新型组合锚地基的水平静力性能有了显著的改善,其水平承载力提高了约2倍,初始水平抗剪刚度提高了约4倍。组合锚地基具有良好的抗推剪性能,应用前景广泛。
An innovative composite helical pile(CHP)foundation with small and large anchor plates is proposed to solve the issue of relatively weak lateral bearing capacity and stiffness of ordinary helical pile(OHP)one,focusing on investigating the basic mechanical performance such as failure mode,lateral bearing capacity and stiffness under lateral monotonic loading.Firstly,a group of typical CHP foundation under a cyclic loading was tested in-situ,and the experimental results were used to validate the efficiency of the CHP foundation.Then,the lateral ultimate bearing capacity and main influencing factors of OHP were discussed.Finally,a finite element method(FEM)was applied to perform the entire process analyses of CHP and OPC foundations under the lateral monotonic loading,respectively.The results show that when reaching the lateral ultimate bearing capacity state,the soil above the bottom anchor plate leads to taking place the local shear failure,meanwhile,the material of the anchor plate and rod is in an elastic state.Compared with the OHP foundation,the lateral mechanical performance of the innovative CHP foundation has been significantly improved in which its lateral ultimate bearing capacity is twice increased,and the initial lateral anti-shear stiffness is quadrupled.The CHP foundations have excellent lateral resistances with wide application prospects.
作者
刘利民
王治伟
高明德
叶永明
阎石
张曰果
LIU Limin;WANG Zhiwei;GAO Mingde;YE Yongming;YAN Shi;ZHANG Yueguo(Liaoning Electric Power Survey and Design Institute Co.,Ltd.,Shenyang 110179,China;School of Civil Engineering,Shenyang Jianzhu University,Shenyang 110168,China)
出处
《地震工程与工程振动》
CSCD
北大核心
2023年第2期239-246,共8页
Earthquake Engineering and Engineering Dynamics
基金
中国能源建设集团规划设计有限公司科技项目(GSKJ2-T02-2020)。
关键词
组合式螺旋锚复合地基
水平极限承载力
水平抗剪刚度
现场试验
数值分析
composite helical pile(CHP)foundations
lateral ultimate bearing capacity
lateral anti-shear stiffness
experiment in-situ
numerical analysis
