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Rise of water table above the ground surface causes
- a)equal increase in pore water pressure and total stress
- b)equal decrease in pore water pressure and total stress
- c)increase in pore water pressure but decrease in total stress
- d)decrease in pore water pressure but increase in total stress
Correct answer is option 'A'. Can you explain this answer?
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Rise of water table above the ground surface causesa)equal increase in...
**Explanation:**
The rise of the water table above the ground surface can have several effects on the soil and the stress conditions within it. The correct answer to this question is option A, which states that there is an equal increase in pore water pressure and total stress. This answer can be explained by considering the behavior of water and soil under different conditions.
1. **Pore Water Pressure**: Pore water pressure is the pressure exerted by water within the void spaces (pores) of a soil mass. When the water table rises above the ground surface, the water in the soil pores is subjected to increased hydrostatic pressure. This results in an increase in pore water pressure.
2. **Total Stress**: Total stress is the sum of the effective stress and the pore water pressure. The effective stress is the stress carried by the soil grains themselves, while the pore water pressure acts in the opposite direction and reduces the effective stress. When the water table rises, the pore water pressure increases, which in turn increases the total stress.
3. **Equilibrium Condition**: In a saturated soil, the pore water pressure tends to reach an equilibrium condition with the external water pressure (in this case, the rising water table). As the water table rises, the pore water pressure increases to match the increase in external water pressure. This is because water tends to flow from areas of higher pressure to areas of lower pressure, and the soil pores allow water to flow freely.
4. **Hydrostatic Pressure**: The increase in pore water pressure due to the rising water table is proportional to the increase in the hydrostatic pressure exerted by the water table. This means that the increase in pore water pressure is equal to the increase in total stress, as both are influenced by the rising water table.
Therefore, the correct answer is option A, which states that there is an equal increase in pore water pressure and total stress. This is because the rise of the water table above the ground surface causes an increase in pore water pressure, which in turn increases the total stress in the soil mass.
The rise of the water table above the ground surface can have several effects on the soil and the stress conditions within it. The correct answer to this question is option A, which states that there is an equal increase in pore water pressure and total stress. This answer can be explained by considering the behavior of water and soil under different conditions.
1. **Pore Water Pressure**: Pore water pressure is the pressure exerted by water within the void spaces (pores) of a soil mass. When the water table rises above the ground surface, the water in the soil pores is subjected to increased hydrostatic pressure. This results in an increase in pore water pressure.
2. **Total Stress**: Total stress is the sum of the effective stress and the pore water pressure. The effective stress is the stress carried by the soil grains themselves, while the pore water pressure acts in the opposite direction and reduces the effective stress. When the water table rises, the pore water pressure increases, which in turn increases the total stress.
3. **Equilibrium Condition**: In a saturated soil, the pore water pressure tends to reach an equilibrium condition with the external water pressure (in this case, the rising water table). As the water table rises, the pore water pressure increases to match the increase in external water pressure. This is because water tends to flow from areas of higher pressure to areas of lower pressure, and the soil pores allow water to flow freely.
4. **Hydrostatic Pressure**: The increase in pore water pressure due to the rising water table is proportional to the increase in the hydrostatic pressure exerted by the water table. This means that the increase in pore water pressure is equal to the increase in total stress, as both are influenced by the rising water table.
Therefore, the correct answer is option A, which states that there is an equal increase in pore water pressure and total stress. This is because the rise of the water table above the ground surface causes an increase in pore water pressure, which in turn increases the total stress in the soil mass.
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Rise of water table above the ground surface causesa)equal increase in pore water pressure and total stressb)equal decrease in pore water pressure and total stressc)increase in pore water pressure but decrease in total stressd)decrease in pore water pressure but increase in total stressCorrect answer is option 'A'. Can you explain this answer?
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