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In a soil investigation work at a site, Standard Penetration Test (SPT) was conducted at every 1.5 m interval up to 30 m depth. At 3 m depth, the observed number of hammer blows for three successive 150 mm penetrations were 8, 6 and 9, respectively. The SPTN-value at 3 m depth, is
- a)14
- b)17
- c)23
- d)15
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
In a soil investigation work at a site, Standard Penetration Test (SPT...
No. of blows for each 150 mm penetration 8, 6 and 9.
We will not consider first 150 mm number of blows.
Hence, for last 300 mm, number of blows are 15.
Hence, observed SPT number = 15.
We will not consider first 150 mm number of blows.
Hence, for last 300 mm, number of blows are 15.
Hence, observed SPT number = 15.
Most Upvoted Answer
In a soil investigation work at a site, Standard Penetration Test (SPT...
Given information:
- Standard Penetration Test (SPT) conducted at every 1.5 m interval up to 30 m depth.
- Observed number of hammer blows for three successive 150 mm penetrations at 3 m depth are 8, 6, and 9.
To find: SPTN-value at 3 m depth.
Solution:
The SPTN-value represents the number of blows required to achieve a penetration of 300 mm. In the given case, the penetration is 150 mm, so we need to determine the SPTN-value using the observed number of blows.
Calculating SPTN-value:
To calculate the SPTN-value at 3 m depth, we need to find the average number of blows for three successive 150 mm penetrations.
Step 1: Add the number of blows for each penetration.
8 + 6 + 9 = 23
Step 2: Divide the sum by the number of penetrations (3).
23 / 3 = 7.67
Since the SPTN-value represents the number of blows required for a penetration of 300 mm, we need to scale up the obtained value.
Step 3: Scale up the average number of blows to 300 mm penetration.
7.67 * (300 / 150) = 15.34
Rounding off to the nearest integer, we get the SPTN-value at 3 m depth as 15.
Therefore, the correct answer is option 'D' - 15.
- Standard Penetration Test (SPT) conducted at every 1.5 m interval up to 30 m depth.
- Observed number of hammer blows for three successive 150 mm penetrations at 3 m depth are 8, 6, and 9.
To find: SPTN-value at 3 m depth.
Solution:
The SPTN-value represents the number of blows required to achieve a penetration of 300 mm. In the given case, the penetration is 150 mm, so we need to determine the SPTN-value using the observed number of blows.
Calculating SPTN-value:
To calculate the SPTN-value at 3 m depth, we need to find the average number of blows for three successive 150 mm penetrations.
Step 1: Add the number of blows for each penetration.
8 + 6 + 9 = 23
Step 2: Divide the sum by the number of penetrations (3).
23 / 3 = 7.67
Since the SPTN-value represents the number of blows required for a penetration of 300 mm, we need to scale up the obtained value.
Step 3: Scale up the average number of blows to 300 mm penetration.
7.67 * (300 / 150) = 15.34
Rounding off to the nearest integer, we get the SPTN-value at 3 m depth as 15.
Therefore, the correct answer is option 'D' - 15.
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In a soil investigation work at a site, Standard Penetration Test (SPT) was conducted at every 1.5 m interval up to 30 m depth. At 3 m depth, the observed number of hammer blows for three successive 150 mm penetrations were 8, 6 and 9, respectively. The SPTN-value at 3 m depth, isa)14b)17c)23d)15Correct answer is option 'D'. Can you explain this answer?
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In a soil investigation work at a site, Standard Penetration Test (SPT) was conducted at every 1.5 m interval up to 30 m depth. At 3 m depth, the observed number of hammer blows for three successive 150 mm penetrations were 8, 6 and 9, respectively. The SPTN-value at 3 m depth, isa)14b)17c)23d)15Correct answer is option 'D'. Can you explain this answer? for GATE 2024 is part of GATE preparation. The Question and answers have been prepared according to the GATE exam syllabus. Information about In a soil investigation work at a site, Standard Penetration Test (SPT) was conducted at every 1.5 m interval up to 30 m depth. At 3 m depth, the observed number of hammer blows for three successive 150 mm penetrations were 8, 6 and 9, respectively. The SPTN-value at 3 m depth, isa)14b)17c)23d)15Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for GATE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In a soil investigation work at a site, Standard Penetration Test (SPT) was conducted at every 1.5 m interval up to 30 m depth. At 3 m depth, the observed number of hammer blows for three successive 150 mm penetrations were 8, 6 and 9, respectively. The SPTN-value at 3 m depth, isa)14b)17c)23d)15Correct answer is option 'D'. Can you explain this answer?.
In a soil investigation work at a site, Standard Penetration Test (SPT) was conducted at every 1.5 m interval up to 30 m depth. At 3 m depth, the observed number of hammer blows for three successive 150 mm penetrations were 8, 6 and 9, respectively. The SPTN-value at 3 m depth, isa)14b)17c)23d)15Correct answer is option 'D'. Can you explain this answer? for GATE 2024 is part of GATE preparation. The Question and answers have been prepared according to the GATE exam syllabus. Information about In a soil investigation work at a site, Standard Penetration Test (SPT) was conducted at every 1.5 m interval up to 30 m depth. At 3 m depth, the observed number of hammer blows for three successive 150 mm penetrations were 8, 6 and 9, respectively. The SPTN-value at 3 m depth, isa)14b)17c)23d)15Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for GATE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for In a soil investigation work at a site, Standard Penetration Test (SPT) was conducted at every 1.5 m interval up to 30 m depth. At 3 m depth, the observed number of hammer blows for three successive 150 mm penetrations were 8, 6 and 9, respectively. The SPTN-value at 3 m depth, isa)14b)17c)23d)15Correct answer is option 'D'. Can you explain this answer?.
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