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In a shear test on cohensionless soils, if the initial void ratio is less than critical void ratio (ec), the sample will:
- a)Increase in volume
- b)Initially increases in volume and then remain constant
- c)Decrease in volume
- d)Initially decreases and then increases in volume
Correct answer is option 'D'. Can you explain this answer?
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In a shear test on cohensionless soils, if the initial void ratio is l...
If the initial void ratio is less than the critical void ratio, this means it is dense sand. Hence volume will initially decrease and then increase.
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In a shear test on cohensionless soils, if the initial void ratio is l...
Explanation:
When a shear test is conducted on cohesionless soils, the sample undergoes deformation due to the application of shear stress. The behavior of the sample depends on its initial void ratio and the critical void ratio.
- Initial void ratio: The initial void ratio is the ratio of the volume of voids to the volume of solids in the soil sample before any deformation occurs. It is denoted by e0.
- Critical void ratio: The critical void ratio (ec) is the void ratio at which the soil is just on the verge of being fully saturated. It is also called the minimum void ratio. At this void ratio, the soil experiences the least compressibility and maximum shear strength.
Now, let's consider the different scenarios based on the initial void ratio of the sample:
1. e0 < />
When the initial void ratio of the sample is less than the critical void ratio, the following happens:
- Initially, the sample experiences a decrease in volume due to the application of shear stress. This is because the soil particles are rearranging themselves to align with the direction of the applied stress.
- However, as the deformation progresses, the voids start to close up and the volume of the sample starts to increase. This is because the soil particles are getting closer together and the voids are reducing in size.
- At a certain point, the volume of the sample reaches a maximum and then starts to decrease again. This is because the voids have been completely closed and the soil particles are now being compressed under the applied stress.
Therefore, the correct answer is option 'D', i.e., the sample initially decreases in volume and then increases in volume.
When a shear test is conducted on cohesionless soils, the sample undergoes deformation due to the application of shear stress. The behavior of the sample depends on its initial void ratio and the critical void ratio.
- Initial void ratio: The initial void ratio is the ratio of the volume of voids to the volume of solids in the soil sample before any deformation occurs. It is denoted by e0.
- Critical void ratio: The critical void ratio (ec) is the void ratio at which the soil is just on the verge of being fully saturated. It is also called the minimum void ratio. At this void ratio, the soil experiences the least compressibility and maximum shear strength.
Now, let's consider the different scenarios based on the initial void ratio of the sample:
1. e0 < />
When the initial void ratio of the sample is less than the critical void ratio, the following happens:
- Initially, the sample experiences a decrease in volume due to the application of shear stress. This is because the soil particles are rearranging themselves to align with the direction of the applied stress.
- However, as the deformation progresses, the voids start to close up and the volume of the sample starts to increase. This is because the soil particles are getting closer together and the voids are reducing in size.
- At a certain point, the volume of the sample reaches a maximum and then starts to decrease again. This is because the voids have been completely closed and the soil particles are now being compressed under the applied stress.
Therefore, the correct answer is option 'D', i.e., the sample initially decreases in volume and then increases in volume.
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In a shear test on cohensionless soils, if the initial void ratio is less than critical void ratio (ec), the sample will:a)Increase in volumeb)Initially increases in volume and then remain constantc)Decrease in volumed)Initially decreases and then increases in volumeCorrect answer is option 'D'. Can you explain this answer?
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In a shear test on cohensionless soils, if the initial void ratio is less than critical void ratio (ec), the sample will:a)Increase in volumeb)Initially increases in volume and then remain constantc)Decrease in volumed)Initially decreases and then increases in volumeCorrect answer is option 'D'. Can you explain this answer? for Railways 2024 is part of Railways preparation. The Question and answers have been prepared according to the Railways exam syllabus. Information about In a shear test on cohensionless soils, if the initial void ratio is less than critical void ratio (ec), the sample will:a)Increase in volumeb)Initially increases in volume and then remain constantc)Decrease in volumed)Initially decreases and then increases in volumeCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Railways 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In a shear test on cohensionless soils, if the initial void ratio is less than critical void ratio (ec), the sample will:a)Increase in volumeb)Initially increases in volume and then remain constantc)Decrease in volumed)Initially decreases and then increases in volumeCorrect answer is option 'D'. Can you explain this answer?.
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