分层土中的沉桩试验及分析  

Experiment and analysis of jacked pile in layered soil

作　　者：蒋跃楠[1] 黄广龙[2] Jiang Yuenan Huang Guanglong(Jinling Institute of Technology Architectural Engineering Institute, Nanjing 211169, China College of Civil Engineering Nanjing Tech University, Nanjing 210009, China)

机构地区：[1]金陵科技学院建筑工程学院,南京211169 [2]南京工业大学土木与交通学院,南京210009

出　　处：《工程勘察》2017年第4期1-6,共6页Geotechnical Investigation & Surveying

基　　金：国家自然科学基金项目(41472283);金陵科技学院科研启动基金(jit-rcyj-201402)

摘　　要：静压桩的沉桩过程与桩端土性质密切相关,压桩力或桩端阻力在土层分界面上下发生变化,存在超前深度、滞后深度等现象,探讨分层土的沉桩机理对于合理确定静压桩的桩端持力层深度、进行桩基优化设计等方面都有重要意义。本文通过室内模型试验进行了静压桩在分层土中的沉桩分析,试验结果表明:同一桩径的桩在不同分层土中的沉桩特性不同,不同桩径的桩在同一分层土中的沉桩特性也不同,端阻力和压桩力在分层界面上下的变化趋势相近,分层界面处的土颗粒位移是分层效应产生的主要原因。The pile jacking process is closely related to the surrounding soil property. The pile driving pressure or tip resistance will change in advance or lag at the interface of different soil stratum. It is significant to study the pile jacking mechanism in layered soil because it will help to determine the bearing Stratum and optimize the pile design. The pile-driven mechanism in layered soil is analyzed by a model test. The result shows that the pile-driven process of the pile is different with the same pile diameter in different layered soil and different pile diameter in same layered soil. The changing tendency of pile driven pressure and tip resistance near the interface is similar. The pile-driven effect in layered soil is mainly caused by the soil particles movement around the interface.

关 键 词：静压桩 分层土 沉桩效应 模型试验 

分 类 号：TU413.5[建筑科学—岩土工程]