天津滨海重塑软黏土一维固结蠕变特性研究

软黏土蠕变产生的长期变形严重影响建筑物及地基的安全性和稳定性,故通过设置不同预压条件模拟软黏土的初始受力状态,对重塑软黏土进行一维固结蠕变试验。研究表明:不同预压条件下,重塑软黏土一维固结蠕变历时曲线的瞬时变形较大,随着加载时间的增长,土体产生缓慢的蠕变,变形量逐渐减小,最终趋于稳定;此外,软黏土一维固结蠕变等时曲线中应变随应力水平的增大而增大,曲线延伸方向逐渐向应变轴靠拢,非线性愈加明显。基于上述研究,引入时间参量t,建立了软黏土一维固结蠕变预测公式,并对公式的准确性和适用性进行验证。该公式可对软黏土地基因蠕变产生的长期变形进行预测分析,为实际工程的设计、施工提供理论指导。

Study on the One-Dimensional Consolidation Creep Characteristics of Tianjin Binhai Remoulded Soft Clay

The long-term deformation caused by the creep of soft clay seriously affects the safety and stability of buildings and foundations. Therefore, one-dimensional consolidation creep tests of remolded soft clay were carried out by setting different preloading conditions to simulate the initial stress state of soft clay. The research results show that under different preloading conditions, the instantaneous deformation of the one-dimensional consolidation creep duration curve of remodeled soft clay is overall change trend is relatively large. As the loading time increases, the soil mass slow creep, the amount of deformation gradually decreases, and finally stabilizes. In addition, the strain in the one-dimensional consolidation creep isochronous curve of soft clay increases with the increase of the stress level, and the extension direction of the curve gradually moves closer to the strain axis, the nonlinearity becomes more obvious. On the basis of above researches, the time parameter t was introduced to establish the one-dimensional consolidation creep prediction formula of soft clay, and verify the accuracy and applicability of the formula. This formula can predict and analyze the long-term deformation caused by the genetic consolidation creep of soft clay, and provide theoretical guidance for the design and construction of actual projects.