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对与大多数工程而言,将土作为饱和土是一种合理的简化,然而,随着研究的不断深入,对于工程中一部分特殊性质的土,这种简化将造成实践当中失误。例如,在膨胀土地基基础的设计中,假如按照膨胀土的现有强度进行设计,有可能将强度参数估计过高,对于实际而言显得不安全;而如果按最低强度进行设计,又不可避免地造成浪费。因此,按非饱和状态研究土工程力学性质是非常重要的。
For most projects, the use of soil as a saturated soil is a reasonable simplification. However, with the continuous deepening of research, this simplification will lead to mistakes in practice for some special types of soil in the project. For example, in the design of expansive soil foundations, if the design is based on the existing strength of expansive soils, it is possible to overestimate the strength parameters and may not be safe in practice; and if the design is based on the lowest strength, it is inevitable To waste. Therefore, it is very important to study the geotechnical properties of unsaturated soil.