ABSTRACT

Soft foundations of high embankments exhibit significant time-dependent effect on deformation in decades after construction, and there is a lack of simple method for predicting the creep rate of over-consolidated soft clay under plain strain condition. In this paper, laboratory creep tests under plain strain consolidation with different principal stress ratio were shown. The variation of stress in zero strain direction (σ_y) under different degree of consolidation was analysed. Linear relationship between (σ_y) and the applied principal stress σ_x (or σ_z) was found. And then, the creep rate of volumetric strain (C_α) and vertical strain (β) were calculated and linked to volumetric stress defined ratio of over-consolidation (OCR_p) and stress ratio (K). Finally, the new parameter K∙OCR_p was found to have a good correlation with the creep rate (C_α or β).

摘要

高路堤软基在施工后的几十年中对变形具有显着的时间依赖性，缺乏简单的方法来预测超固结软粘土在平原应变条件下的蠕变速率。本文给出了不同主应力比的平面应变固结下的室内蠕变试验。应力的零应变方向（变化σ _ý下不同程度的整合）进行了分析。发现 ( σ _y ) 与施加的主应力σ _x (或σ _z )之间存在线性关系。然后，体积应变 ( C _α ) 和垂直应变 (β ) 被计算并与体积应力定义的过度固结比 (OCR _p ) 和应力比 (K) 相关联。最后，发现新参数 K∙OCR _p与蠕变速率（C _α或β）具有良好的相关性。