Identify whether the given statements about the plate load test, used to find the ultimate bearing capacity of soil, are correct or incorrect. (A) The plate load test is a laboratory test used to find the ultimate bearing capacity of soil. (B) The bearing plate is either circular or square, made of steel not less than 25 mm in thickness.
Try it first: pick an option, then read the explanation.
Asked in SSC JE 06/11/2024 (Morning)
Detailed Explanation
The plate load test loads a small steel plate placed at the proposed foundation level on site and measures how much it settles. From the load–settlement curve we get the bearing capacity and an estimate of settlement.
Why “Statement B is correct and A is incorrect” Is Correct
Statement A is incorrect: the test is done in a pit at the site, on the soil in its natural state. It is an in-situ (field) test, not a laboratory test.
Statement B is correct: the plate is mild steel, square or circular, 300 mm to 750 mm in size and at least 25 mm thick so that it behaves as rigid.
Why the Other Options Are Wrong
- B. Both statements are incorrect: Statement B is correct.
- C. Both statements are correct: Statement A is wrong — it is a field test.
- D. Statement A is correct and B is incorrect: It is the other way round: A is wrong and B is right.
Key Point
Plate load test = field test; plate 300–750 mm, at least 25 mm thick.
Key Concepts for Students
- The test only reflects soil to a depth of about 2 × plate width.
- Results on sand must be scaled carefully to full-size footings.
- A seating load is applied and released before the test starts.
Practice more: this is question 16 in Shallow and Deep Foundation MCQs – Part 2. Try the whole set and check every answer instantly.