LIVE Course for free

Rated by 1 million+ students
Get app now
0 votes
in General by (30.0k points)
closed by
For the clay with an OCR of greater than 4 in a CD test, the A-factor at failure will be. 
1. Zero
2. Positive (less than 1)
3. Negative
4. Positive (more than 1)

1 Answer

0 votes
by (54.3k points)
selected by
Best answer
Correct Answer - Option 3 : Negative


Over Consolidation Ratio:

Over Consolidation Ratio ( OCR ) is defined as the ratio of maximum pressure experienced in the past

( Preconsoildation pressure ) to the present overburden pressure.

\({\bf{OCR}} = \frac{{{\bf{Maximum}}\;{\bf{pressure}}\;{\bf{in}}\;{\bf{past}}}}{{{\bf{Present}}\;{\bf{overburden}}\;{\bf{pressure}}}}\)

OCR > 1 It is Over consolidated soil

OCR = 1 It is Normally consolidated soil

OCR < 1It is Under consolidated soil


OCR of clay = 4

Since the OCR of the given soil is greater than 1, it is overconsolidated clay.

A – factor is a function of the over-consolidation ratio in the case of overconsolidated clay.

For OC clays, A = f (OCR)

For heavily overconsolidated clay A < 0, the typical value of A are –0.2 to –0.3

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.