三峡大学学报（自然科学版）2018，Vol.40Issue(1)：54-58,5.DOI:10.13393/j.cnki.issn.1672-948X.2018.01.012
超大直径钻孔灌注桩成桩过程的钢护筒受力分析
Mechanical Analysis of Steel Casing Pipes of Large Diameter Cast-in-situ Bored Pile's Pile-forming Process
摘要
Abstract
Large span transmission tower built in rivers and lakes in the deepwater usually use large diameter bored pile foundation;steel casing pipes are important components which ensure the quality and safety of pouring piles into the hole and into the piles.Combining one of Su-Tong Yangtze River large span transmission tower design-large diameter cast-in-situ bored pile construction,the finite element analysis software ABAQUS is used to carry out the numerical simulation analysis of the process of large diameter cast-in-situ bored piles into piles,and study the mechanical behavior of steel casing pipes of large diameter cast-in-situ bored pile's bored and pile process in the river.Study results show that:Steel casing pipes' stress increases with the drilling process and decreases with the concrete condensation and hardening after pouring concrete.The most unfavorable conditions of pile construction process is pre-pouring concrete stage after the completion of the drilling phase;steel casing pipes' stress reaches a maximum in this condition.This condition is recommended as a control condition for steel casing pipes structure design.The maximum stress of construction after steel protecting tube pile is 24.7％ of the steel strength design value.This article suggests that if structural design using steel casing pipes in pile body stress solution,the construction stress should be considered.关键词
钢护筒/ABAQUS/泥浆护壁/钻孔桩/受力性能Key words
steel casing pipes/ABAQUS/slurry-supported/bored pile/mechanical performance分类
建筑与水利引用本文复制引用
李媛媛,俞瑾,曹平周..超大直径钻孔灌注桩成桩过程的钢护筒受力分析[J].三峡大学学报（自然科学版）,2018,40(1):54-58,5.基金项目
国家自然科学基金“钢—混凝土组合结构粘结滑移统一理论及其破坏准则的研究”(50478044) （50478044）
