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3 |
Soil samplings and samplers |
1 |
Soil Sampling |
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In general soil samples are categorized as
shown in fig. 1.5 |
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Fig. 1.5 Types of samples |
2 |
Disturbed samples: |
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The structure of the soil is disturbed to the considerable degree by the action of the boring tools or the excavation equipments. |
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The disturbances can be classified in following basic types: |
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Change in the stress condition, |
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Change in the water content and the void ratio, |
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Disturbance of the soil structure, |
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Chemical changes, |
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Mixing and segregation of soil constituents |
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The causes of the disturbances are listed below: |
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Method of advancing the borehole, |
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Mechanism used to advance the sampler, |
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Dimension and type of sampler, |
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Procedure followed in sampling and boring. |
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If all the constituents are present in the sample which represents the same soil type from any place, then it is called a representive sample. In the remoulded sample the engineering properties get changed due to remoulding. |
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