风积砂地基中螺旋锚竖向承载特性研究  

Vertical bearing characteristics of helical anchorsin aeolian sand foundations

作　　者：陈庆胜 胡桑田 刘魏 郭咏华 李麟鹤 屈讼昭 张岳 CHEN Qing-sheng;HU Sang-tian;LIU Wei;GUO Yong-hua;LI Lin-he;QU Song-zhao;ZHANG Yue(State Grid Gansu Electric Power Company Economic and Technological Research Institute,Lanzhou 730050,China;School of Civil and Transportation Engineering,Henan University of Urban Construction,Pingdingshan 467036,China;Power China Henan Electric Power Survey&Design Institute,Zhengzhou 450199,China)

机构地区：[1]国网甘肃省电力公司经济技术研究院,甘肃兰州730050 [2]河南城建学院土木与交通学院,河南平顶山467036 [3]中国电建集团河南省电力勘测设计院有限公司,河南郑州450199

出　　处：《河南城建学院学报》2025年第2期9-19,33,共12页Journal of Henan University of Urban Construction

基　　金：河南省高等学校青年骨干教师培养计划(2024GGJS125);国家自然科学基金项目(52208165);河南城建学院学术技术带头人培养项目(YCJXSJSDTR202202);国网甘肃省电力公司2024年研究开发项目(522730240007)。

摘　　要：采用CEL有限元技术探讨风积砂地质条件下螺旋锚的竖向承载性能,重点分析双盘螺旋锚在不同叶片间距下的抗拔与受压承载力特性。系统研究了螺旋锚叶片间距与直径变化对其承载力的影响规律,明确了单盘独立失效与双盘协同失效模式之间的转换临界叶片间距为3D。初步揭示了螺旋锚的钻入施工过程对其上拔承载力的内在影响机制,并通过折减系数法量化了砂土软化效应对其上拔承载力的具体影响。研究结果显示,螺旋锚的竖向承载力随叶片直径增大而提升约48%,随叶片间距增加而增大约20%。上拔承载力的理论计算值与数值模拟结果吻合良好,但下压承载力与数值模拟结果存在偏差,且偏差随叶片数量与间距的增加而增大。同时,发现双叶片螺旋锚在风积砂地质条件下的安装扰动系数为0.24~0.42,表明安装过程对螺旋锚的上拔承载力具有显著影响。研究结果可为风积砂地基中螺旋锚的设计与应用提供关键的理论与实践依据。Utilizing the CEL finite element technique,this study delves into the vertical bearing performance of helical anchors in aeolian sand geological conditions,with a particular focus on analyzing the tensile and compressive bearing capacity characteristics of multi-helix helical anchors at varying helix spacing.A systematic investigation was conducted to explore the influence patterns of helix spacing and diameter variations on bearing capacity,clarifying that the critical spacing for the transition between single-helix independent failure and multi-helix collaborative failure modes is 3 D.Preliminary insights were gained into the intrinsic impact mechanism of the helical anchor drilling installation process on uplift capacity,and the specific influence of soil softening effects in sand on uplift capacity was quantified using a reduction factor method.The research results reveal that the vertical bearing capacity of helical anchors increases by approximately 48%with an increase in helix diameter and enhances by about 20%with an increase in helix spacing.The theoretical calculations for uplift capacity align well with numerical simulation results,however,deviations exist between compressive capacity and numerical simulation results,and these deviations tend to increase with the number and spacing of helices.Additionally,it was found that the installation disturbance factor for double-helix helical anchors in aeolian sand geological conditions ranges between 0.24 and 0.42,indicating a significant impact of the installation process on uplift capacity.These findings provide crucial theoretical and practical guidance for the design and application of helical anchors in aeolian sand foundations.

关 键 词：螺旋锚 风积砂地基 竖向承载特性 数值模拟 安装扰动系数 

分 类 号：TU476[建筑科学—结构工程]