DHARM756 GEOTECHNICAL ENGINEERING
Questions and Problems
18.1 (a) Describe with a neat sketch how will you carry out the wash boring method of soil explora-
tion. What are its merits and demerits?
(b) Explain the terms ‘inside clearance’ and ‘outside clearance’ as applied to a sampler. Why are
they provided? (S.V.U.—Four-year B.Tech.—Dec., 1984)
18.2 Write a short note on Geophysical exploration using electrical resistivity.
(S.V.U.—Four-year B.Tech.—Dec., 1984)
18.3 Under what circumstances are geophysical methods used in exploration? Discuss the usefulness
of a dynamic cone penetration test and its limitations. Write a brief note on wash borings.
(S.V.U.—Four-year B.Tech.—Sep., 1983)
18.4 (a) Discuss with neat sketches any two boring methods used in soil exploration.
(b) Sketch a split-spoon sampler and explain its parts.
(S.V.U.—B.Tech. (Part-time)—Sep., 1983)
18.5 What are the various steps considered in the planning of sub-surface exploration programme?
Describe the standard penetration test. In what way is it useful in foundation design?
(S.V.U.—Four-year B.Tech.—Apr., 1983)
18.6 Write short notes on:
(a) Geophysical methods, (b) Penetration Tests.
(S.V.U.—Four-year B.Tech.—Apr., 1983)
18.7 Why are undisturbed samples required? Describe any one procedure of obtaining undisturbed
samples for a multi-storeyed building project.
For what purpose are geophysical methods used? Describe any one method.
(S.V.U.—Four-year B.Tech.—Dec., 1982)
18.8 What are the advantages and disadvantages of accessible exploration? Discuss. Explain (a) Wash
boring, (b) Split spoon sampler. Write a brief note on the precautions to be taken in transporting
undisturbed samples. (S.V.U.—Four-year B.Tech.—Oct., 1982)
18.9 (a) Explain and discuss the various factors that help decide the number and depth of bore holes
required for subsoil exploration.
(b) What is ‘N-value’ of Standard Penetration Test? How do you find the relative density from
‘N-value’? Explain the various corrections to be applied to the observed value of N.
(S.V.U.—B.Tech. (Part-time)—Sept., 1982)
18.10 (a) Enumerate the various methods of soil exploration and mention the circumstances under
which each is best suited. What do you mean by undisturbed sample?
(b) Explain with a neat sketch the construction and use of a split spoon sampler.
(S.V.U.—B.E., (R.R.)—Feb., 1976)
18.11 Describe the “Standard Penetration Test” used in soil exploration. List the information that can
be obtained by the test when made in (a) clay, (b) sand.
Comment on the correction factors to be used for N-values
(a) for sands for depth below ground level
(b) for fine sand under water table. (S.V.U.—B.E., (R.R.)—May, 1969)
18.12 Write a brief critical note on vane shear test. (S.V.U.—B.E., (N.R.)—Sep., 1967)