非饱和膨胀土非线性经验蠕变模型的研究  

Experimental study on experiential model considering non-linear creep of unsaturated expansive soil

作　　者：肖宏彬[1] 马千里[1] 金文婷[2] 

机构地区：[1]中南林业科技大学土木工程与力学学院,湖南长沙410004 [2]湖南工业大学岩土工程研究所,湖南株洲412008

出　　处：《中南林业科技大学学报》2011年第6期1-5,共5页Journal of Central South University of Forestry & Technology

基　　金：国家自然科学基金项目(50978097);湖南省科技厅资助项目(2010SK3047)

摘　　要：针对南宁非饱和膨胀土进行了一系列室内一维压缩蠕变试验,得到了相应的应力-应变曲线,探讨了该膨胀土的流变特性。试验结果表明:南宁非饱和膨胀土具有非线性流变变形特征,且随着压应力的增加,膨胀土流变的非线性程度增大。对不同含水率下的应变-时间关系曲线均可拟合成对数函数形式,可以得到拟合程度很高的蠕变方程。该经验模型为膨胀土非线性流变问题的进一步研究提供了理论依据。Aiming at the unsaturated expansive soil in Nanning city of Guangxi Zhuang Autonomous Region,a series of indoor one-dimensional compression creep tests were conducted,the related stress-strain curves were obtained and the soil＇s non-linear rheological characteristics have been researched.The results show that the nonlinear rheological characteristics was found in the creep deformation of the soil,and the degree of nonliner rheology will grow when the stress increasesd.Under any water content,the strain-time curves can be fitted in the form of logarithmic function,and the creep equation with high fitting degree can be obtained.This empirical model provides a theoretical basis for the further study on non-linear rheological characteristics of unsaturated expansive soils.

关 键 词：非饱和土 膨胀土 非线性变形 流变特性 

分 类 号：TU411.5[建筑科学—岩土工程]