基于结构性参数的昆明软土压缩特性研究

STUDY ON COMPRESSION CHARACTERISTICS OF KUNMING SOFT SOIL BASED ON STRUCTURAL PARAMETERS

为了明确结构性软土的压缩特性以及土体结构性强弱对工程安全的影响,以昆明市巫家坝片区结构性软土为研究对象,开展了一维固结试验及现场实测,提出了综合考虑含水率和屈服应力的结构性参数γ,并通过不同土样进行了验证。研究结果表明,昆明软土具有明显的结构特征,且因其高含水率和较高的有机质含量区别于其他地区土体。随着含水率的增加,软土的结构特性逐渐减弱,更容易发生压缩破坏。并且讨论了先期固结压力随含水率的增加而减小,软土含水率越高,越容易发生变形破坏。研究结果可为预测软土地层中地基的沉降提供理论指导。

In order to clarify the compression characteristics of structural soft soil and the influence of structural strength of soil on engineering safety.Taking the structural soft soil in Wujiaba area of Kunming City as the research object,the one-dimensional consolidation test and field measurement were carried out,and the structural parameterγconsidering the moisture content and yield stress was proposed,which was verified by different soil samples.The results show that soft soil in Kunming has obvious structural characteristics and is different from soil in other areas because of its high moisture content and high organic matter content.With the increase of moisture content,the structural characteristics of soft soil gradually weaken and compression failure is more likely to occur.It is also discussed that the early consolidation pressure decreases with the increase of moisture content,and the higher the moisture content of soft soil,the easier the deformation and failure.The results can provide theoretical guidance for predicting the settlement of the foundation in the soft soil layer.