冻土中单桩抗拔承载力的模型试验研究  

Model Study of Tensile Bearing Capacity of a Single Pile under Frozen Condition

作　　者：汪仁和[1] 王伟[2] 程永锋[3] 

机构地区：[1]安徽理工大学土木工程系,安徽淮南232001 [2]同济大学地下建筑与工程系,上海200092 [3]北京国电电力建设研究所,北京100055

出　　处：《冰川冻土》2006年第5期766-771,共6页Journal of Glaciology and Geocryology

基　　金：安徽省自然科学基金项目(050440501)资助

摘　　要：以新疆地区某高压输电线冻土桩基础受力分析为背景,在人工冻结条件下,进行了单桩的室内抗拔模型试验.研究了在不同冻结温度下,冻土中单桩在竖向上拔荷载作用下的承载力特性及其力学性状,分析了包括桩的轴力、桩土之间的冻结力沿桩身的分布规律,桩头竖向位移与荷载的关系,并且定量分析了冻结力和承载力与冻结温度的关系.最后,将分析结果与抗压桩进行了比较.成果可为西部冻土地区桩基的设计与施工提供参考依据.Aimed at the pile foundation in frozen soil of a high voltage transmission line project in Xinjiang Region, a laboratory tensile model test is carried out under artificial frozen condition. The characteristics of load-bearing capacity of a single pile and its mechanical behaviors under a vertical tensile load in frozen soil with various temperatures were revealed from the test. The pile＇s axis force, adfreezing force between pile and soil and its distribution in frozen soil, as well as the relationship between vertical displacement of pile and load, were analyzed. Function formulas were given out to describe the effect of temperature on ad- freezing force and bearing capacity. The results were compared with that of a pile in compressive condition. Through the research, adfreezing force of a pile and the relationship between tensile bearing capacity and temperature in tensile condition were gained. It is useful for pile foundation designing and constructing in western frozen areas.

关 键 词：单桩 室内模型试验 抗拔承载力 冻结力 冻土 

分 类 号：P642.14[天文地球—工程地质学]