摘要
咬合桩支护结构的变形受桩间距、桩径等多种因素影响,其中荤素桩的布桩方式以及素桩作用对支护结构的整体抗弯特性产生了很大影响。以咬合桩中荤素桩的咬合角度为变量,利用等效刚度法对咬合桩围护结构的抗弯刚度进行理论计算,并结合PLAXIS有限元软件对桩体抗弯承载特性进行模拟。研究分析表明,随着钢筋混凝土桩和素混凝土桩咬合角度不断增大,等效墙体厚度不断增加,桩体抗弯刚度不断增大,桩体侧向位移不断减小,说明咬合角度的增加对于控制基坑稳定性及基坑变形有较为突出的作用。综合对比桩体抗弯刚度、侧向位移、轴向刚度等因素后认为,当桩体咬合角度介于25°~35°时,桩体抗弯承载特性处于最佳状态。
The deformation of the the secant pile support structure is influenced by various factors such as pile spacing and pile diameter.The arrangement of concrete secant piles and reinforced concrete secant piles and the action of concrete secant piles have a significant impact on the overall bending resistance characteristics of the support structure.Taking the occlusion angle of the reinforced concrete secant pile in the secant pile as a variable,the equivalent stiffness method is used to theoretically calculate the bending stiffness of the secant pile enclosure structure,and the bending bearing characteristics of the pile body are simulated and studied using PLAXIS finite element software.Research analysis shows that as the occlusion angle of reinforced concrete piles and plain concrete piles increases,the equivalent wall thickness increases;the bending stiffness of the pile body increases;and the lateral displacement of the pile body decreases,indicating that the increase in occlusion angle plays a prominent role in controlling the stability and deformation of the foundation pit.After comprehensive comparison of factors such as the bending stiffness,lateral displacement and axial stiffness of the pile,it is believed that the bending bearing characteristics of the pile are in the optimal state when the occlusion angle of the pile is between 25°and 35°.
作者
闫文进
曹程明
龙照
郭志元
时轶磊
YAN Wenjin;CAO Chengming;LONG Zhao;GUO Zhiyuan;SHI Yilei(Gansu CSCEC Municipal Engineering Investigation and Design Institute Co.,Ltd.,Lanzhou 730000,China;CSCEC AECOM Consultants Co.,Ltd,Lanzhou 730000,China)
出处
《甘肃科学学报》
2025年第6期32-38,共7页
Journal of Gansu Sciences
基金
甘肃省重点研发计划-工业类(23YFGA0083)。
关键词
咬合角度
抗弯刚度
桩体位移
咬合桩
数值模拟
Occlusion angle
Bending stiffness
Displacement of pile
Secant pile
Numerical simulation
