竖向抗压单桩变形破坏机制  

Deformation and failure mechanism of single pile under vertical load

作　　者：陈亚东[1] 王旭东[2] 刘剑雄[1] 

机构地区：[1]淮阴工学院建筑工程学院,江苏淮安223001 [2]南京工业大学交通学院,江苏南京210009

出　　处：《南京工业大学学报（自然科学版）》2013年第3期88-91,共4页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：江苏省六大人才高峰基金(09-F-004);淮安市科技支撑计划(工业)(HAG2012049)

摘　　要：采用可视化室内模型试验方法,对垂直受荷单桩桩周土体位移场、应变场发展规律及破坏性状进行较为深入研究。结果表明:桩侧土体变形影响范围为(3～4)b(b为方桩边长),桩端下土体影响范围为(5～6)b;单桩桩侧土体最大剪应变由桩身上部逐渐向桩身下部延伸,桩端以上(3～4)b截面附近存在侧阻力弱化区;单桩破坏面由桩侧土体剪切滑动面、桩端鼻锥状弹性核及桩端附近的2片剪切滑动面组成。The change regulation of soil displacement and strain field, and the destruction behavior of single pile under vertical loads were studied by a visualization model method. The results showed that the affected area of pile lateral deformation was （3-4）b （b was the side length） and that of pile tip deformation was （5- 6） b. The maximal shear strain extended from top to bottom of the pile body, and a frictional resistance weakening area existed above the pile tip section （3-4）b. Single pile damage plane was composed of shear sliding surfaces near pile side ,pile tip nose cone-shaped elastic core and two shear sliding surfaces near pile tip.

关 键 词：桩基础 模型试验 位移 破坏机制 

分 类 号：TU473[建筑科学—结构工程]