不同桩端土对灌注桩承载特性影响的研究  

RESEARCH ON INFLUENCE OF DIFFERENT PILE-TIP SOILS ON BEARING BEHAVIORS OF BORED PILES BY LABORATORY TESTS

作　　者：刘锟[1,2,3] 赵春风[1,2] 

机构地区：[1]同济大学岩土及地下工程教育部重点实验室,上海200092 [2]同济大学地下建筑与工程系,上海200092 [3]上海市政工程设计研究总院,上海200092

出　　处：《低温建筑技术》2010年第4期63-65,共3页Low Temperature Architecture Technology

摘　　要：就不同桩端土对灌注桩承载特性的影响进行室内试验研究。根据软土地区灌注桩的穿越土层特点,按试验目的设计室内试验,去除成桩质量、桩身粗糙程度等因素的影响,采用预置裹膜预埋的方法设置模型桩。采用六种不同材料模拟桩端土,参照规范对各试桩进行静载试验。结果表明,桩端土的性质对桩极限承载力有较大的影响,采用向桩端粘土掺加水泥来增加桩极限承载力的方法可行,本室内试验可为类似试验提供参考。The primary goal of this paper is to introduce laboratory tests to study the influence of different pile-tip soils on the bearing behaviors of bored piles. Based on the characteristics of strata piles passing through in soft clay zone, laboratory tests were designed to extinguish the influence from pile quality and the coarse degree, by pre-installing prefabricated model piles. Six kinds of pile-tip soil were used in static loading tests. It is concluded that pile-tip soils could generate some influences on bearing behaviors of bored piles, the method of adding cement to the soils was valid, and these laboratory tests could supply some experiences to similar tests.

关 键 词：室内试验 灌注桩 桩端土 承载特性 

分 类 号：TU473[建筑科学—结构工程]