土体侧移作用下螺旋钢桩被动承载机理分析  

Analysis of Passive Bearing Mechanism of Helical Pile under Lateral Soil Movement

作　　者：李建彪 邬叶飞 马思伟 孙昌利 邵康 LI Jianbiao;WU Yefei;MA Siwei;SUN Changli;SHAO Kang(The Third Engineering Co.,Ltd.of China First Highway Engineering Go.,Ltd.,Beijing 102200,China;School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]中交一公局第三工程有限公司,北京102200 [2]西南石油大学地球科学与技术学院,成都610500

出　　处：《路基工程》2024年第5期32-38,共7页Subgrade Engineering

基　　金：国家自然科学基金项目(52078427);中交第一公路工程局有限公司科技研发项目(2021CX469)。

摘　　要：基于边坡抗滑桩设计混合方法中建议的简化数值分析模型,对多叶片螺旋钢桩和相同桩长直轴桩内力(弯矩、剪力和轴力)在不同侧向土体位移下沿桩身的分布特征进行对比,并研究螺旋钢桩桩身变形和不同位置处螺旋叶片变形特征,以分析螺旋钢桩作为被动桩的承载机理。结果表明:土体侧向位移作用下,螺旋钢桩内力分布特征与直轴桩基本相同,但螺旋钢桩内力峰值更大;螺旋叶片在被动承载过程中根据位置不同而发挥不同作用,桩顶和桩底附近螺旋叶片主要贡献桩身轴力,桩中部附近螺旋叶片主要贡献弯矩和剪力。Based on the simplified numerical analysis model proposed in the hybrid method for slope anti-slide pile design,multi-blade helical pile and straight shaft pile with the same length were taken as the control group,the distribution features of the internal force(bending moment,shearing force and axial force)along the pile under different lateral soil displacement were compared so as to study the deformation of the helical pile body and the deformation characteristics of the helical blades at different positions,and then to analyze the bearing mechanism of the helical pile as passive pile.The result shows that:under the action of lateral displacement of soil,the helical pile has basically the same distribution characteristics of internal force as straight shaft pile,but larger peak value of internal force than straight shaft pile;the helical blades play different roles according to their position in the course of passive bearing as follows:the blades near the pile top and bottom mainly contribute to the axial force,and the blade in the middle to the bending moment and shearing force.

关 键 词：螺旋钢桩 侧向位移 数值分析 内力与变形 被动承载机理 

分 类 号：TU473.11[建筑科学—结构工程]