刚性基础下水泥土桩复合地基有效长径比研究  

Study on Critical Length-diameter Ratio of Cement-soil Pile Composite Subgrade under Rigid Foundation

作　　者：张兆强[1] 解恒燕[1,2] 陶传迁 杨光[1] 刘文洋[1] Zhang Zhaoqiang;Xie Hengyan;Tao Chuanqian;Yang Guang;Liu Wenyang(College of Engineering and Water Conservancy,Heilongjiang Bayi Agricultural University,Daqing 163319;Beijing Engineering Research Center of Existing Building Retrofitting)

机构地区：[1]黑龙江八一农垦大学土木水利学院,大庆163319 [2]北京市既有建筑改造工程技术研究中心

出　　处：《黑龙江八一农垦大学学报》2021年第6期94-99,113,共7页journal of heilongjiang bayi agricultural university

基　　金：国家自然科学基金项目(51608180);北京市既有建筑改造工程技术研究中心开放课题资助;黑龙江八一农垦大学“三纵”计划项目(ZRCPY201804);北方寒区轻钢温室结构功能提升改造及加固技术研究(校内培育课题)。

摘　　要：桩长和桩径是复合地基设计中的重要参数,合理确定其取值,具有重要的现实意义。针对刚性基础下水泥土桩复合地基,引入有效长径比概念,应用三维非线性有限元方法,从地基变形角度系统分析了置换率、桩土模量比、下卧层与加固区模量比对刚性基础下桩有效长径比的影响。研究结果表明:刚性基础下水泥土桩的有效长径比主要取决于置换率,桩土模量比、下卧层与加固区模量比对其影响相对较小。Length and diameter of pile are very important design parameters of composite foundation,and determining its values reasonably has very important practical significance.For cement-soil pile composite subgrade under rigid foundation,a three-dimensional nonlinear finite element analysis is performed to analyse critical length-diameter ratio according to replacement ratio,pile-soil modulus ratio and the modulus ratio of substratum and reinforced area,and critical length-diameter ratio concept is introduced.It is found that critical length-diameter ratio of cement-soil pile under rigid foundation mainly depends on replacement ratio,the impact of pile-soil modulus ratio and the modulus ratio of substratum and reinforced area is relatively little.

关 键 词：水泥土桩 复合地基 有效长径比 置换率 

分 类 号：TU473.1[建筑科学—结构工程]