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柔性基础下复合地基桩土应力比模型试验
引用本文:方磊,谢永利.柔性基础下复合地基桩土应力比模型试验[J].长安大学学报(自然科学版),2005,25(2):30-32.
作者姓名:方磊  谢永利
作者单位:长安大学,特殊地区公路工程教育部重点实验室,陕西,西安,710064
基金项目:国家西部交通建设科技项目(2001 318 812 59)
摘    要:在研制的模型箱内,应用PVC管件模拟桩体,气囊加载,应变片和压力盒测试应力,在不同地基土状态下,对柔性基础下复合地基的桩顶应力、桩间土应力、桩端承载力进行了测试,研究了不同工况下桩土应力比的变化规律,并与刚性基础下复合地基桩土应力比进行了对比分析,结果表明桩土应力比随着桩底持力层强度的提高而增大,随着桩间土密实度的增大而减小,随着上部荷载的增加而逐渐趋于稳定。

关 键 词:道路工程  复合地基  柔性基础  模型试验  桩土应力比
文章编号:1671-8879(2005)02-0030-03
修稿时间:2004年2月29日

Model experiment of pile-soil stress ratio of composite ground under flexible foundation
FANG Lei,XIE Yong-li.Model experiment of pile-soil stress ratio of composite ground under flexible foundation[J].JOurnal of Chang’an University:Natural Science Edition,2005,25(2):30-32.
Authors:FANG Lei  XIE Yong-li
Abstract:In model box, PVC pipe was utilized to simulate pile, the air chamber was loaded, the stress was tested with strain gauge and pressure gauge, the stress of pile tip and pile bottom and the stress of the earth between piles were measured, the changing law of the pile-soil stress ratio of the composite ground under flexible foundation was studied, the results were compared with the pile-soil stress ratio of the composite ground under rigid foundation. The results indicate that the pile-soil stress ratio increase with the stress of pile bottom, decrease when the earth density increase, become stability when load aggrandize.
Keywords:road engineering  composite ground  flexible foundation  model experiment  pile-soil stress ratio
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