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For analysis of pavements and determination of modulus of sub-grade reaction by plate load test, the most representative value of modulus reaction can be obtained at a pressure of______g/cm2
- a)1.70
- b)0.20
- c)2.50
- d)0.70
Correct answer is option 'D'. Can you explain this answer?
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For analysis of pavements and determination of modulus of sub-grade re...
Concept:
Plate load test:
- The plate load test is a field test, which is performed to determine the ultimate bearing capacity of the soil and the probable settlement under a given load.
- This test is very popular for the selection and design of shallow foundation.
Procedure:
- Excavate test pit up to the desired depth. The pit size should be at least 5 times the size of the test plate (Bp).
- At the center of the pit, a small hole or depression is created. The size of the hole is the same as the size of the steel plate.
- A mild steel plate is used as a load-bearing plate whose thickness should be at least 25 mm thickness and size may vary from 300 mm to 750 mm. The plate can be square or circular. Generally, a square plate is used for square footing and a circular plate is used for circular footing.
- A column is placed at the center of the plate. The load is transferred to the plate through the centrally placed column.
- The load can be transferred to the column either by the gravity loading method or by the truss method.
- At least two dial gauges should be placed at diagonal corners of the plate to record the settlement. The gauges are placed on a platform so that it does not settle with the plate.
- Apply a seating load of 0.7 g/cm2 or T/m2 and release before the actual loading starts.
- The initial readings are noted.
- The load is then applied through the hydraulic jack and increased gradually. The increment is generally one-fifth of the expected safe bearing capacity or one-tenth of the ultimate bearing capacity or any other smaller value. The applied load is noted from the pressure gauge.
- The settlement is observed for each increment and from the dial gauge. After increasing the load-settlement should be observed after 1, 4, 10, 20, 40, and 60 minutes and then at hourly intervals until the rate of settlement is less than .02 mm per hour. The readings are noted in tabular form.
- After completing the collection of data for a particular loading, the next load increment is applied and readings are noted under new load. This increment and data collection is repeated until the maximum load is applied. The maximum load is generally 1.5 times the expected ultimate load or 3 times of the expected allowable bearing pressure.
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For analysis of pavements and determination of modulus of sub-grade re...
Introduction:
The modulus of sub-grade reaction is a key parameter used in the analysis and design of pavements. It represents the stiffness or support provided by the underlying sub-grade soil. The plate load test is commonly used to determine the modulus of sub-grade reaction by applying a known pressure to a plate and measuring the corresponding settlement.
Determination of the modulus of sub-grade reaction:
During the plate load test, a circular plate of known dimensions is loaded incrementally with a known pressure. The corresponding settlement is measured at each load increment. The relationship between the applied pressure and the resulting settlement is used to determine the modulus of sub-grade reaction.
Significance of the most representative value:
The most representative value of the modulus of sub-grade reaction is crucial in pavement analysis and design as it accurately reflects the behavior of the underlying sub-grade soil. This value is used to estimate the load-carrying capacity of the pavement and assess its performance under traffic loading.
The pressure at which the most representative value is obtained:
According to the given question, the most representative value of the modulus of sub-grade reaction is obtained at a pressure of 0.70 g/cm2. This means that the settlement measured at this pressure provides the most accurate estimation of the sub-grade soil's stiffness or support.
Reason for selecting a pressure of 0.70 g/cm2:
The specific reason for selecting a pressure of 0.70 g/cm2 as the most representative value may not be provided in the question. However, it is likely that this value has been determined based on previous experience or research studies. It is important to note that the most representative value may vary depending on the specific soil conditions, pavement type, and design requirements.
Conclusion:
In summary, the most representative value of the modulus of sub-grade reaction in the plate load test is obtained at a pressure of 0.70 g/cm2. This value accurately represents the stiffness or support provided by the underlying sub-grade soil and is crucial for pavement analysis and design. It is important to consider site-specific factors and design requirements when determining the most representative value.
The modulus of sub-grade reaction is a key parameter used in the analysis and design of pavements. It represents the stiffness or support provided by the underlying sub-grade soil. The plate load test is commonly used to determine the modulus of sub-grade reaction by applying a known pressure to a plate and measuring the corresponding settlement.
Determination of the modulus of sub-grade reaction:
During the plate load test, a circular plate of known dimensions is loaded incrementally with a known pressure. The corresponding settlement is measured at each load increment. The relationship between the applied pressure and the resulting settlement is used to determine the modulus of sub-grade reaction.
Significance of the most representative value:
The most representative value of the modulus of sub-grade reaction is crucial in pavement analysis and design as it accurately reflects the behavior of the underlying sub-grade soil. This value is used to estimate the load-carrying capacity of the pavement and assess its performance under traffic loading.
The pressure at which the most representative value is obtained:
According to the given question, the most representative value of the modulus of sub-grade reaction is obtained at a pressure of 0.70 g/cm2. This means that the settlement measured at this pressure provides the most accurate estimation of the sub-grade soil's stiffness or support.
Reason for selecting a pressure of 0.70 g/cm2:
The specific reason for selecting a pressure of 0.70 g/cm2 as the most representative value may not be provided in the question. However, it is likely that this value has been determined based on previous experience or research studies. It is important to note that the most representative value may vary depending on the specific soil conditions, pavement type, and design requirements.
Conclusion:
In summary, the most representative value of the modulus of sub-grade reaction in the plate load test is obtained at a pressure of 0.70 g/cm2. This value accurately represents the stiffness or support provided by the underlying sub-grade soil and is crucial for pavement analysis and design. It is important to consider site-specific factors and design requirements when determining the most representative value.
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For analysis of pavements and determination of modulus of sub-grade reaction by plate load test, the most representative value of modulus reaction can be obtained at a pressure of______g/cm2a)1.70b)0.20c)2.50d)0.70Correct answer is option 'D'. Can you explain this answer?
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For analysis of pavements and determination of modulus of sub-grade reaction by plate load test, the most representative value of modulus reaction can be obtained at a pressure of______g/cm2a)1.70b)0.20c)2.50d)0.70Correct answer is option 'D'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about For analysis of pavements and determination of modulus of sub-grade reaction by plate load test, the most representative value of modulus reaction can be obtained at a pressure of______g/cm2a)1.70b)0.20c)2.50d)0.70Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for For analysis of pavements and determination of modulus of sub-grade reaction by plate load test, the most representative value of modulus reaction can be obtained at a pressure of______g/cm2a)1.70b)0.20c)2.50d)0.70Correct answer is option 'D'. Can you explain this answer?.
For analysis of pavements and determination of modulus of sub-grade reaction by plate load test, the most representative value of modulus reaction can be obtained at a pressure of______g/cm2a)1.70b)0.20c)2.50d)0.70Correct answer is option 'D'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about For analysis of pavements and determination of modulus of sub-grade reaction by plate load test, the most representative value of modulus reaction can be obtained at a pressure of______g/cm2a)1.70b)0.20c)2.50d)0.70Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for For analysis of pavements and determination of modulus of sub-grade reaction by plate load test, the most representative value of modulus reaction can be obtained at a pressure of______g/cm2a)1.70b)0.20c)2.50d)0.70Correct answer is option 'D'. Can you explain this answer?.
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