河南理工大学学报（自然科学版）2025，Vol.44Issue(2)：176-185,10.DOI:10.16186/j.cnki.1673-9787.2023110005
阶梯型变截面桩水平承载机理研究
Study on the horizontal bearing mechanism of stepped variable cross-section piles
摘要
Abstract
Objectives This study aims to investigate the horizontal bearing mechanism of rigid and elastic stepped variable cross-section piles in silty sand foundations and to evaluate the impact of variable diameter factors on horizontal bearing capacity.Indoor and numerical simulation experiments were conducted.Meth-ods Horizontal loading tests were performed on rigid and elastic stepped variable cross-section piles as well as constant cross-section piles.Finite element software was used to develop numerical models with different variable diameter ratios and lengths for analysis.Results The results indicate that reducing the diameter of the lower half of the pile,using the stepped variable cross-section design,has a minimal impact on the horizontal bearing capacity of the elastic piles.Considering material efficiency,the unit volume horizontal bearing capacity of the rigid stepped variable cross-section pile is 6.4%higher than that of the constant cross-section pile,while the elastic stepped variable cross-section pile shows a 33.28%increase.Under the same horizontal load conditions,the shallow soil resistance of the rigid stepped variable cross-section pile is higher than that of the constant cross-section pile,while the shallow soil resistance of the elastic stepped variable cross-section pile is lower than that of the elastic constant cross-section pile.The horizontal bearing capacity of the stepped variable cross-section pile increases with higher variable diameter ratios and lengths,while the unit volume horizontal bearing capacity decreases as the variable diameter ratio in-creases.When the variable diameter ratio is 0.8 and the variable diameter length is 50%of the pile length,the horizontal bearing capacity of the elastic stepped variable cross-section pile is close to that of the elastic constant cross-section pile.Compared to the elastic constant cross-section pile,the unit volume horizontal bearing capacity is maximized when the variable diameter ratio is 0.8 and the variable diameter length is 40%of the pile length.Conclusions The unit horizontal bearing capacity of the stepped variable cross-section pile is higher than that of the constant cross-section pile.Reasonable optimization of the variable di-ameter length and ratio can help reduce project costs.The findings provide valuable insights for the applica-tion of stepped variable cross-section piles in practical engineering.关键词
粉砂地基/阶梯型变截面桩/水平承载机理/变径比/有限元分析Key words
silty sand foundation/stepped variable cross-section pile/horizontal bearing mechanism/model test/finite element analysis分类
建筑与水利引用本文复制引用
张建伟,杨森,瑜璐,赫山林,张龑..阶梯型变截面桩水平承载机理研究[J].河南理工大学学报（自然科学版）,2025,44(2):176-185,10.基金项目
国家自然科学基金资助项目(51508163) （51508163）
河南省研究生教育改革与质量提升工程资助项目(YJS2021JD13) （YJS2021JD13）
河南省自然科学基金资助项目(232300420292) （232300420292）
河南大学研究生英才计划资助项目(SYLYC2023060) （SYLYC2023060）
