Civil Engineering (CE) Exam > Civil Engineering (CE) Questions > Identify the correct Statement:a)Toughness in...
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Identify the correct Statement:
- a)Toughness index is defined as the ratio of Plasticity index to the Flow Index
- b)For the soils having high rate of loss of shear strength, their degree of firmness is more.
- c)Both 1 and 2
- d)None of the above
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
Identify the correct Statement:a)Toughness index is defined as the rat...
Toughness index is defined as the ratio of Plasticity index to the flow index.
Toughness Index= 
IP = Plasticity Index
If = Flow index, which represent the rate of loss of shear strength in soils.
More will be the toughness index, more will be the soil firm.
Most Upvoted Answer
Identify the correct Statement:a)Toughness index is defined as the rat...
Toughness Index in Soil Mechanics
Definition:
The toughness index is defined as the ratio of the plasticity index to the flow index. It is used to characterize the shear strength and deformation properties of soil.
Formula:
Toughness index (TI) = Plasticity index (PI) / Flow index (FI)
Description:
The plasticity index (PI) of soil is the difference between the liquid limit and the plastic limit. It represents the range of moisture content where soil behaves as a plastic material.
The flow index (FI) is a measure of the rate of deformation of soil under constant stress. It is defined as the slope of the log shear stress vs. log shear rate curve.
The toughness index (TI) is a measure of the soil's ability to resist deformation and maintain shear strength under various stress conditions.
Significance:
The toughness index is an important parameter in geotechnical engineering. It helps in the design of foundations, retaining walls, and other structures that are subjected to dynamic loads.
Soils with a high toughness index are preferred for construction purposes as they offer better stability and resistance to deformation.
Conclusion:
In conclusion, the correct statement is option 'A'. The toughness index is defined as the ratio of the plasticity index to the flow index. It is an important parameter in geotechnical engineering and helps in the design of stable structures.
Definition:
The toughness index is defined as the ratio of the plasticity index to the flow index. It is used to characterize the shear strength and deformation properties of soil.
Formula:
Toughness index (TI) = Plasticity index (PI) / Flow index (FI)
Description:
The plasticity index (PI) of soil is the difference between the liquid limit and the plastic limit. It represents the range of moisture content where soil behaves as a plastic material.
The flow index (FI) is a measure of the rate of deformation of soil under constant stress. It is defined as the slope of the log shear stress vs. log shear rate curve.
The toughness index (TI) is a measure of the soil's ability to resist deformation and maintain shear strength under various stress conditions.
Significance:
The toughness index is an important parameter in geotechnical engineering. It helps in the design of foundations, retaining walls, and other structures that are subjected to dynamic loads.
Soils with a high toughness index are preferred for construction purposes as they offer better stability and resistance to deformation.
Conclusion:
In conclusion, the correct statement is option 'A'. The toughness index is defined as the ratio of the plasticity index to the flow index. It is an important parameter in geotechnical engineering and helps in the design of stable structures.
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Identify the correct Statement:a)Toughness index is defined as the ratio of Plasticity index to the Flow Indexb)For the soils having high rate of loss of shear strength, their degree of firmness is more.c)Both 1 and 2d)None of the aboveCorrect answer is option 'A'. Can you explain this answer?
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