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利用改装后的固结仪,针对天津地区真空预压处理后的吹填软土,开展了一系列固结特性试验研究,着重研究了试样尺寸对吹填软土固结特性的影响.结果表明,不同尺寸试样的e-lg,p曲线均表现为结构较完整、结构破坏、趋于重塑土3个阶段;在同一等级荷载作用下,稳定应变随着试样高度的增加而线性减小;固结系数和次固结系数均随荷载先增大后减小,最后趋于稳定,固结系数的峰值随着试样尺寸的增大而减小,次固结系数的峰值则相反.基于试验结果建立了一维应变预测模型,模型考虑了尺寸效应,具有参数少、易确定的优点.
Using the modified consolidation instrument, a series of experimental studies on the consolidation properties of vacuum-infilled soft soil under vacuum preloading have been carried out in Tianjin, and the effect of sample size on the consolidation properties of the soft soil under dredging has been studied. Results It is shown that the e-lg and p curves of samples with different sizes show three stages of structural integrity, structural failure and tend to rebuild the soil. Under the same level of loading, the steady strain increases linearly with the height of the sample The consolidation coefficient and secondary consolidation coefficient increase first and then decrease with the increase of load, and finally tend to be stable. The peak value of consolidation coefficient decreases with the increase of specimen size, and the peak value of secondary consolidation coefficient On the contrary, a one-dimensional strain prediction model is established based on the experimental results. The model takes into account the size effect and has the advantages of less parameters and easy determination.