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土体孔隙溶液化学特性反映其沉积环境,沉积环境影响土体的工程性质,其相关性是土力学的重要研究内容。本文首先详细介绍软土孔隙溶液化学特性的试验方法,并对上海浅层黏土展开试验研究。通过试验给出了土层各项化学特性指标的分布规律。结合上海地区海平面变化,探讨上海浅部土层的化学特性所反映的沉积环境变迁历史,尤其是第四纪海侵海退对土体化学特性的影响。分析土体的化学特性与其物理力学特性的相关性,获得了在不同沉积环境(海侵和海退)中软土的含盐量对灵敏度和物理指标的两种相反的影响规律。
The chemical properties of soil pore solution reflect the sedimentary environment, the sedimentary environment affects the engineering properties of soil, and the correlation is an important research content of soil mechanics. In this paper, the method of testing the chemical properties of soft soil pore solution is introduced in detail, and the experimental study of Shanghai shallow clay is carried out. Through experiments, the distribution rules of various chemical properties of soil are given. Combined with the sea level changes in Shanghai, the authors discuss the history of the sedimentary environment reflected by the chemical characteristics of the shallow soil in Shanghai, especially the influence of Quaternary sea transgression and regression on the soil chemical properties. By analyzing the correlation between soil chemical properties and physical and mechanical properties, the influence of the salinity of soft soil on the sensitivity and physical indexes in different sedimentary environments (transgression and regression) was contrasted.