桩土应力比曲线的机理分析  

Mechanism Analysis of Pile-soil Stress Ratio Curve

作　　者：叶观宝[1] 李志斌[1] 徐超[1] 王森[1] 杨晓明[1] 

机构地区：[1]同济大学地下建筑与工程系,上海市200092

出　　处：《勘察科学技术》2004年第3期3-5,共3页Site Investigation Science and Technology

摘　　要：该文在高速公路水泥土搅拌桩复合地基载荷试验的基础上 ,现场测量了桩顶应力和桩间土应力 ,得到桩土应力比的曲线。并结合桩间土的室内三轴试验 ,分析了桩土应力比曲线产生的机理 :桩身材料表现为应变软化 ,而桩间土表现为应变硬化 ,所以桩土应力比先是增大 ,达到峰值后逐渐减小。Stress of pile tip and stress of soil among piles are measured by plate load test of the composite foundation with cement mixing pile in expressway construction and the curve of pile-soil stress ratio is observed.The variation mechanism of the pile-soil stress ratio is analyzed in association with triaxial tests of the soil.The material of pile performs strain softening, however the soil performs strain hardening, so the pile-soil stress ratio increases in the beginning and then decreases after its peak reached.

关 键 词：水泥土搅拌桩 地基加固 高速公路 载荷试验 

分 类 号：TU473.1[建筑科学—结构工程]