BE-02 Open cut method Lesson: Utility Trench Construction

Consistency and Plasticity

Determining the Consistency of Cohesive Soil

The determination of the consistency (condition) can be done both in situ and in the laboratory. In the case of the in-situ test, the condition of a cohesive type of soil is to be determined as follows:

  1. A type of soil is called “very soft, if it runs through the fingers while being pressed together in a fist;

  2. Soft, if it can be kneaded easily;

  3. Firm, if, although it is hard to be kneaded, it can be rolled out to 0.12 in (3 mm) thick rolls in the hand without ripping or crumbling away in the process;

  4. Stiff, if, although it is ripped and crumbles away in the process of being formed into 0.12 in (3 mm) thick rolls, it is still wet enough to be formed into a lump again;

  5. Solid, if it is dried out and, normally, is light in colour. It can no longer be kneaded, but only be broken apart. The individual broken bits can no longer be formed into a lump again.“ 

[DINENISO14688:2001]

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