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What is area ratio for good quality of undisturbed sample what should be its value?Īrea ratio: It should be kept less as possible as such a lesser area ratio implies a sharp edge. Definition of undisturbed soil sample: When the structural integrity of the soil is retained and has a high recovery rate, then that type of sample is called an undisturbed soil sample.
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If the in-situ properties of soil do not retain while collection process then that type of soil is called a disturbed soil sample. What is the difference between disturbed and undisturbed soil samples?
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What is undisturbed soil sampling?ĭuring the sampling process of the soil sample, if the natural structure of the soil and water content does not disturb, that means the soil retained its natural structure and water content, then these types of soil samples are called undisturbed soil samples.įor testing CBR, the mold (after soaking if necessary) is placed on the base of a loading frame provided with a screw jack, and the standard plunger (having a circular cross section of 3 sq in.) is placed in the center of the specimen and load is applied by working the screw jack. The results show that, with the addition of volcanic ash and lime, there is an increase in the CBR value of soil, dry density and a decrease in optimum water content. The tests are compaction, CBR, and SEM (Scanning Electron Microscopy) tests. What laboratory tests is ideal for the undisturbed soil sample? The quality of samples obtained is excellent and the probability of obtaining a satisfactory undisturbed sample is high. The stationary piston sampler is used for sampling soft-to-stiff cohesive soils. Which type of sampler gives high degree of undisturbed samples? The sampler tube is twisted and pushed into the soil. b) Thick-walled sampler: These are used to obtain disturbed but representative samples. The sampler tube is pushed into the soil without any twisting. A) Thin-walled sampler: These are used to obtain undisturbed samples.