温度对非饱和路基土吸力影响的研究  

Research of Temperature Effects on the Suction for Unsaturated Subgrade Soils

作　　者：汪建峰[1] 汪辉[2] 王钊[3] 

机构地区：[1]武汉铁路局建设管理处,武汉430071 [2]军事经济学院财务系,武汉430035 [3]武汉大学土木建筑工程学院,武汉430072

出　　处：《武汉理工大学学报》2010年第3期50-53,共4页Journal of Wuhan University of Technology

基　　金：交通部西部交通建设科技项目(200531874010)

摘　　要：季节性的温度变化和日温差变化,导致路基土吸力变化,所以研究温度对非饱和路基土吸力的影响意义较大。用连通侧管式张力计测得路基土在含水量不变化时不同温度下的基质吸力值,发现基质吸力值并非恒定,而是随着温度的升高,近似线性降低,随着温度的降低,其值线性升高。分析温度吸力影响的机理后,提出了温度对基质吸力影响的修正公式,使得基质吸力的测量更为精确。Seasonal and daily cyclic changes of temperature result in changes of suction of subgrade soil,so the research of temperature effects on the suction for unsaturated subgrade soils is important.In this article the author discovered that temperature effects on the matric suction are obvious by the experiment.The experimental results show that at constant water content the matric suction tends to decrease with increasing temperatures.Then the mechanism of temperature effects on the suction for unsaturated subgrade soil is analysised.In addition,a modified equation about the temperature effect on the matric suction is put forward in order to measure the matric suction more accurately.

关 键 词：温度 非饱和土吸力 回归分析 修正公式 

分 类 号：U416.1[交通运输工程—道路与铁道工程]