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近年来，在对国内广泛分布的老粘性土、红土等土体的研究过程中发现，这些土均为＂超固结土＂，其先期固结压力（Ｐｃ）值不仅与土的受荷历史有关，而且还与土的物质组成和结构特征有着十分密切的关系。研究结果表明，影响Ｐｃ值大小的因素很复杂，红土和下蜀土中对Ｐｃ值大小起决定作用的为游离氧化物的胶结连结，而黄土状土中土自重压力则为主导因素。可见土的先期固结压力并非唯一由上覆荷载所致。
In recent years, it has been found during the research on the soils of old cohesive soils and laterite widely distributed in China that these consolidated soils are “overconsolidated soils”. The values of pre-consolidation pressure (Pc) are not only related to the loading history of soils Related, but also with the material composition and structural characteristics of the earth has a very close relationship. The results show that the factors that affect the size of Pc are complex. The content of Pc in red clay and Xiashu clay is the cementing bond of free oxide, while the weight of soil in loessial soil is the dominant factor. It can be seen that the pre-consolidation pressure of the soil is not the only one caused by the overburden.