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本文首先研究软粘土的天然强度及其在各种条件下随荷重而变化的规律;提出综合的抗剪强度理论和原位不排水强度随主应力偏转而变化的表达式。然后讨论软粘土的变形性质,建议采用割线模量曲线的坡度和截距作为其压缩性指标;认为应该区分应力历史和相对密度的影响,以避免出现视先期固结的模糊概念。本文还提出一种弹望性应力应变模式。最后,讨论几种计算软粘土性状的方法,并用工程实例来说明上述各种方法的应用以及计算结果与实测情况的比较。
In this paper, we first study the natural strength of soft clay and its variation with loading under various conditions. We put forward the comprehensive shear strength theory and the expression of in-situ undrained strength as principal stress deflection. Then the deformation properties of soft clay are discussed. It is suggested that the slope and intercept of the secant modulus curve be used as the index of compressibility; it is considered that the influence of stress history and relative density should be discriminated to avoid the fuzzy concept of pre-consolidation. This paper also proposes an elastic stress-strain model. Finally, several methods for calculating soft clay traits are discussed, and engineering examples are used to illustrate the application of the above methods and the comparison between the calculated results and the measured conditions.