作　　者： ; ; ;

机构地区： 东南大学交通学院

出　　处： 《水利学报》 2005年第1期116-119,共4页

摘　　要： 本文分析了次固结产生的机理以及应力水平和应力历史对次固结系数的影响,得出在正常压力水平下,连云港软黏土的次固结系数与固结压力无关,预压不但能减小次固结系数,还能延长次固结发生的时间,从而减小软基在一定时间内的固结变形;研究了次固结系数与压缩指数和加荷比的关系,认为连云港软黏土次固结系数与压缩指数的比值为一个常数,并且受加荷比影响不大。随后,在主固结完成后次固结才产生的假定下,提出了一种次固结变形的简化计算公式,并在分析试验结果的基础上得出各种参数,验证了该方法的适用性。 The definition of secondary consolidation is investigated. The influences of stress level and stress history on secondary consolidation coefficient are discussed and the conclusion that the secondary consolidation coefficient of soft clay is independent of consolidation pressure is obtained. It is found that pre-compression method reduces the secondary consolidation coefficient, delays the occurrence of secondary consolidation and results in the reduction of consolidation deformation. The relationship between secondary consolidation coefficient and compression index is a constant ratio, which indicates that the load ratio has little influence on secondary consolidation coefficient. A simplified formula for calculating the secondary consolidation deformation is proposed and the validity of the formula is verified by the experimental results.

关 键 词： 软黏土 次固结系数 应力历史 压缩指数

领　　域： [建筑科学] [建筑科学]