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为研究超固结比对软黏土次固结特性的影响,对温州正常固结和超固结软黏土开展长期一维压缩试验,系统性研究先期固结压力、超固结比等因素对次固结变形和次固结系数的影响。试验结果表明:先期固结压力对软黏土固结变形发展曲线有显著影响,固结压力小于先期固结压力时,曲线变化较小,接近直线,此时次固结系数随固结压力增长较快;当固结压力超过先期固结压力后,曲线变化明显,呈三段式发展,次固结系数随固结压力的增大略有减小,最后趋向某一稳定值。软黏土的次固结系数随超固结比的增大而减小,通过试验结果分析得到了次固结系数随超固结比变化的计算式。次固结变形随时间的变化在双对数坐标下近似为直线关系,基于此建立了次固结变形累积方程。
In order to study the effect of overconsolidation ratio on secondary consolidation characteristics of soft clay, a long-term one-dimensional compression test was carried out on Wenzhou normal consolidation and overconsolidated soft clay. The factors such as pre-consolidation pressure and over consolidation ratio were systematically studied. Effect of consolidation deformation and secondary consolidation coefficient. The experimental results show that the consolidation pressure has a significant effect on the consolidation curve of soft clay. When the consolidation pressure is less than the initial consolidation pressure, the curve changes little and approaches the straight line. The secondary consolidation coefficient increases with the consolidation pressure When the consolidation pressure exceeds the preconsolidation pressure, the curve changes obviously with a three-stage development. The secondary consolidation coefficient decreases slightly with the increase of the consolidation pressure and finally reaches a certain stable value. The coefficient of secondary consolidation of soft clay decreases with the increase of the ratio of over consolidation, and the formula of the coefficient of secondary consolidation as a function of over consolidation ratio is obtained through the analysis of test results. The secondary consolidation deformation changes with time in the double logarithmic coordinates approximate linear relationship, based on which established secondary consolidation deformation cumulative equation.