砂土地层中多叶片螺旋钢桩压缩承载特性研究  

Study on Compression Bearing Characteristics of Multi-blade Helical Pilein Sandy Stratum

作　　者：邬叶飞 高平 高丽峰 王华志 邵康 WU Yefei;GAO Ping;GAO Lifeng;WANG Huazhi;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64-70,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：为分析砂土地层螺旋钢桩压缩承载特性,介绍多叶片螺旋钢桩竖向压缩承载力的计算方法;采用有限元软件分析砂土地层中双叶片螺旋钢桩在竖向压缩荷载下桩顶沉降响应,验证有限元模型的可靠性;设置不同叶片间距的9组多叶片螺旋钢桩模型,分析轴力和桩周土体剪应变分布规律和荷载分担模式;有限元分析与理论计算承载力结果进行对比,并引入叶片承载力折减系数修正承载力计算公式。结果表明:多叶片螺旋钢桩承载模式由叶片间距决定,叶片间距比等于2是单盘承载模式和筒状剪切模式的分界点;引入叶片承载力折减系数后,结合理论计算公式可较准确地预测多叶片螺旋钢桩极限承载力。In order to analyze the compression bearing characteristics of helical pile in sandy stratum,the method calculating vertical compression bearing capacity of multi-blade helical pile was introduced.Finite element software was used to analyze the pile top settlement response of the double-blade helical pile under vertical compression load in sandy stratum and verify the reliability of the finite element model established.Nine groups of multi-blade helical pile models in different blade spacing were set to analyze the distribution of the axial force of the pile and the shear strain in the soil around the pile,as well as the load sharing mode.The results of the finite element analysis and the bearing capacity calculated theoretically were compared,and then the calculation formula for bearing capacity corrected by blade bearing capacity reduction factor was introduced.The result shows that,the bearing mode of multi-blade helical pile is determined by blade spacing,and the ratio of blade spacing equal to 2 is the point dividing individual bearing mode and cylindrical shearing mode;after the blade bearing capacity reduction factor is introduced,with the theoretical calculation,the ultimate bearing capacity of multi-blade helical pile may be predicted accurately.

关 键 词：砂土 螺旋钢桩 验证 有限元方法 承载机制 极限承载力 

分 类 号：TU473.11[建筑科学—结构工程]