摘要
我国室内固结试验中把次固结沉降曲线作为线性处理,然而,大量的实验数据证明,测定周期的不同次固结曲线呈非线性特征,故次固结系数为变数。通过我国近海典型海相软黏土——浙江平阳港次固结试验为验证实例,提出一种适用于工程的分级加载、延时校正及保持试样结构原状的土工快速测试法。对工程中试验曲线分析及研究表明:我国近海区域软黏土次固结系数与固结压力、压缩指数以及测试时间存在着一定的相关性,次固结系数与固结压力变化呈先增、后降、趋稳的现象,次固结系数峰值与土体深度等有关,Ca/Cc比值为常数。实验中所得到的经验值可作为邻近工程固结沉降量预估,所创方法为填补国家标准规范次固结试验的空白提供有益参考。
In Chinese the secondary consolidation settlement curve in consolidation tests is taken as a linear curve,however,a large number of experimental data demonstrate that there are secondary consolidation curves with non-linear characteristics during different experimental periods,the secondary consolidation coefficient is variable.Through consolidation tests on off shore typical marine soft clay from Zhejiang Pingyang Port to validate the case,a rapid method was proposed for the project with classification of applied loads,delay correction and maintaining undisturbed soil structure.Analysis and study on consolidation test curves for engineering show that： the coefficient of secondary consolidation of soft clay in Chinese＇s coastal regions is correlated with consolidation pressure,compression index and testing time,the coefficient of secondary consolidation was first increased,then dropped,and stabilized with consolidation pressure variation,the peak coefficient of secondary consolidation is relevant to soil depth and the Ca/ Ccratio is constant. Empirical value obtained in the experiment can be used in estimation of consolidation settlement in neighboring project,this new method fills the blank and provides a useful reference for the secondary consolidation test in national standards.
出处
《地下空间与工程学报》
CSCD
北大核心
2016年第4期1082-1088,共7页
Chinese Journal of Underground Space and Engineering
关键词
软黏土
次固结系数
测试周期
原状
曲线
soft clay
coefficient of secondary consolidation
test period
undisturbed
curve
