高陡边坡变截面桩基础受力性能研究  

STUDY ON THE APPLICATION OF STEP VARIABLE SECTION PILE FOUNDATION IN HIGH AND STEEP SLOPES

作　　者：张丽娟[1] 马会超 马一丹 王文明 ZHANG Lijuan;MA Huichao;MA Yidan;WANG Wenming(Shandong Electric Power Engineering Consulting Institute Co.,Ltd.,Jinan 250013,China;Department of Civil Engineering,Shandong Jianzhu university,Jinan 250101,China;Renovation of Building Structure and Underground Space Engineering Key Laboratory of Ministry of Education,Jinan 250101,China)

机构地区：[1]山东电力工程咨询院有限公司,济南250013 [2]山东建筑大学土木工程学院,济南250101 [3]建筑结构加固改造与地下空间工程教育部重点实验室,济南250101

出　　处：《低温建筑技术》2024年第4期45-49,共5页Low Temperature Architecture Technology

基　　金：国家自然科学基金资助项目(51908340);山东省重点研发项目(2022KJ209)。

摘　　要：高陡边坡中输电塔大直径钢管直桩基础存在材料浪费、经济型较差的问题,使用阶梯变截面桩基础可有效提高基础的经济性、降低施工难度。文中采用ABAQUS软件分别建立45°边坡的变截面桩及直桩精细化有限元模型,在相同下压工况下,以最大应力和最大位移为分析对象,对变截面桩和直桩进行对比。研究发现,在软土地区45°边坡条件下,变截面桩和等截面桩最大拉应力值均符合强度要求,最大位移和钢筋笼最大应力相差很小,变截面桩可以代替直桩;在硬土地区45°边坡条件下,变截面桩和等截面桩最大拉应力值均符合强度要求,最大位移和钢筋笼最大应力相差很小,变截面桩可以代替直桩。研究成果可为阶梯变截面桩在高陡边坡输电塔中应用提供一定的借鉴与参考。Material waste and poor economy performance exist in the foundation of large diameter steel pipe pile for transmission tower in high and steep slope.The use of step variable section pile foundation effectively improves the economy and reduces the construction difficulty.The refined finite element model of the variable section piles and straight piles in a 45° slope is established by ABAQUS software.The variable section piles and straight piles are compared in terms of the maximum stress and maximum displacement under the same pressure condition.The results show that under the condition of a 45° slope in soft soil areas,the maximum tensile stress values of variable cross-section piles and equal cross-section piles meet the strength requirements,and the difference between the maximum displacement and the maximum stress of the steel cage is small,in which variable cross-section piles can replace straight piles.Under the condition of a 45° slope in hard soil areas,the maximum tensile stress values of variable cross-section piles and equal cross-section piles meet the strength requirements,and the difference between the maximum displacement and the maximum stress of the steel cage is small,in which variable cross-section piles can replace straight piles.The results may provide the reference and guidance for the application of stepped variable cross-section piles in high and steep slope transmission towers.

关 键 词：变截面桩 等截面桩 大直径钢管桩 

分 类 号：TU47[建筑科学—结构工程]