# Limitations of Terzaghi theory

- The value of the coefficient of consolidation has been assumed to be constant.
- The distance d of the drainage path cannot be measured accurately in the field. The thickness of the deposit is generally variable, and an average value has to be estimated.
- There is sometimes difficulty 1n locating the drainage face, sometimes thin previous seams which can act as good drainage face are missed in the boring operations.
- The equation is based on the assumption that the consolidation is one-dimensional. In the field, the consolidation is generally 3-dimensional. The lateral drainage may have a significant effect on the time rate of consolidation.
- The initial consolidation and secondary consolidation have been neglected. Sometimes these form an important part of the total consolidation.
- In actual practice, the pressure distribution may be far from linear or uniform

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