不同含水率下非饱和黄土K_0固结特性试验  

Analysis on the K_0 Consolidation Tests of Unsaturated Loess under Different Moisture Contents

作　　者：赵丽娅[1] 鞠兴华[1,2] 刘保健[1] 李廷斌[3] 

机构地区：[1]长安大学公路学院,西安710064 [2]陕西铁路工程职业技术学院,陕西渭南714000 [3]西安市政设计研究院有限公司,西安710064

出　　处：《南水北调与水利科技》2012年第2期120-123,共4页South-to-North Water Transfers and Water Science & Technology

基　　金：中央高校基本科研业务费专项资金项目(CHD2009JC117)

摘　　要：针对非饱和原状黄土进行了不同含水率下的恒荷重K0固结试验研究,分析了含水率对割线模量,应力应变特性及侧压力系数的影响。试验表明,在其他条件相同的情况下,割线模量随着荷载的施加逐渐减小,最终趋于稳定,达到稳定值时的割线模量随着含水率的增大而减小,且与含水率线性相关;含水率越大,静止侧压力系数K0增长速率越快,至土结构完全破坏,K0趋于稳定;不同含水率的K0值最终趋于稳定,且稳定值差异性较小;提出了考虑含水率因素的连续加载条件下K0固结过程的变形模型,为研究黄土地区K0固结过程中土体变形特性及路堤沉降提供参考。In this paper,the K_0 consolidation tests with constant load are carried out for the unsaturated original loess under different moisture contents,and the effects of the moisture content on the secant modulus,the stress-strain,and the coefficient of lateral pressure are analyzed.The results show that the secant modulus decreases as the load is applied and becomes stabilized eventually when other conditions are the same.When the secant modulus reaches a steady value,it shows a linearly decreasing trend with the increasing of the moisture content.The greater the moisture content,the faster the growth rate of the static coefficient of lateral pressure K_0.K_0 is tending towards stability when the soil structure is completely destroyed.Finally,the values of K_0 under different moisture contents become stabilized with small differences in the stabilized K_0 values.This paper also proposes the deformation model of the K_0 consolidation process with continuous load considering the moisture content,which provides references for the study of deformation characteristics during the K_0 consolidation process and the subsidence of the embankment in loess region.

关 键 词：含水率 原状黄土 K0固结 

分 类 号：U414[交通运输工程—道路与铁道工程]