河南科技大学学报（自然科学版）2024，Vol.45Issue(4)：57-63,72,8.DOI:10.15926/j.cnki.issn1672-6871.2024.04.008
黄土地基阶梯型截面桩承载模型试验与计算
Model Tests and Calculations on Bearing Capability of Step-type Section Pile in Loess Base
摘要
Abstract
To study the load transfer mechanism of step-type section piles in loess base,the laboratory model tests and finite element calculations were utilized to analyze the axial force,lateral friction resistance,pile top settlement,and load sharing ratio at various depths of step-type section piles under vertical static load.The study explored the impact of the change in diameter ratio on its operational performance and conducted an optimization design.The results indicate that under the same load,the pile top settlement of the step-type section pile is noticeably less than that of the constant section pile.The best control effect on settlement,with the highest material utilization,is achieved when the diameter change ratio is 0.8～0.9.If the ultimate bearing capacities are equal,the highest material utilization rate for the step-type section pile reaches 1.06 times that of the uniform cross-section pile.The step-type section pile acting as a friction pile,receives support from the soil at the variable cross-section.The soil at the base of the variable diameter portion can bear part of the pile top load,while the pile sides can share a greater portion of the pile top load,thus reducing the load on the pile end soil.The lateral friction resistance is more effectively utilized when the diameter change ratio is 0.8～0.9.When the material usage is the same,the step-type section pile significantly increases the bearing capacity compared to the constant section pile.关键词
阶梯型截面桩/等截面桩/变径比/模型试验/有限元分析Key words
step-type section pile/constant section pile/variable diameter ratio/model tests/finite element analysis分类
建筑与水利引用本文复制引用
邓友生,马二立,马建军,李文杰,张克钦,李龙..黄土地基阶梯型截面桩承载模型试验与计算[J].河南科技大学学报（自然科学版）,2024,45(4):57-63,72,8.基金项目
国家自然科学基金项目(51878554,41672308) （51878554,41672308）
陕西省自然科学基础研究计划重点项目(2018JZ5012) （2018JZ5012）
