膨胀作用力与允许变形量之关系的试验研究  

Experiment research on relationship between swelling force and allowable deformation

作　　者：杨和平[1] 廖亚林[1] 张智斌[1] 李艳艳[1] 

机构地区：[1]长沙理工大学特殊土工程研究所,湖南长沙410004

出　　处：《长沙理工大学学报（自然科学版）》2010年第4期1-6,共6页Journal of Changsha University of Science and Technology:Natural Science

基　　金：国家自然科学基金资助项目(50978035);交通部西部科技项目(200831800089);交通部科技项目(2009353311060)

摘　　要：为了弄清3种膨胀力测试方法的差异,探讨允许试样少量变形后膨胀作用力的衰减规律,以百色膨胀土为研究对象,在单轴固结仪上完成平衡加压及膨胀反压两种膨胀力试验.同时按照加压膨胀法的基本原理,利用控制允许变形的平衡加压实测数据,分析其对应的膨胀力数值,获得同一干密度2种含水率土样3种方法测定的膨胀力排序:膨胀反压法最大,平衡加压法居中,加压膨胀法最小.此外,膨胀作用力随变形量呈负指数衰减,上覆压力能起到有效抑制膨胀土体的增湿作用.In order to understand the differences of swelling force tests among three conventional methods and discuss the swelling force attenuation after a small amount of sample deformation was allowed,the expansive soil in Baise was used in the research.Two swelling force tests such as balance pressure and anti-inflation pressure were completed on the uniaxial consolidation apparatus,at the same time,according to the basic principles of expansion force,the swelling force value was analyzed with reference to the balance pressure that the deformation was controlled.The order of the swelling force value of the soil sample with the same dry density and two different water content under three test methods was obtained： the anti-inflation pressure value was the largest,the balance pressure value was in the middle,and the pressure expansion value was the minimum.In addition,there was a negative exponential between the swelling force and the expansion deformation,the humidification of the expensive soil was restrained because of the overburden pressure.

关 键 词：平衡加压法 膨胀反压法 加压膨胀法 膨胀力 允许变形量 

分 类 号：U412.221[交通运输工程—道路与铁道工程]