F.Y. M.Tech. Civil (Structural Engineering) (Semester- (CBCS)
Examination, 2018
ADVANCED DESIGN OF FOUNDATION
Day and Date Wednesday, 12-12-2018 Max. Marks: 70
Time 10.00 A.M. to 1.00 P.M
Instructions: All questions are compulsory.
Make suitable assumption if necessary and mention it clearly.
Figures to the right indicate full marks.
Section I
Q.1 Write IS code method formula for the determination of ultimate bearing
capacity of soils. How does it differ from Terzaghi's formula?
04
8
A plate load test was performed on a uniform deposit of sand and the
following observations were recorded.
Size of plate was 30 x 30cm. Plot load settlement curve and determine the
load on a footing of size 1.5m x 1.5m can carry safely if the settlement is
not to exceed 50 mm.
Q.2 Describe different types of combined footing with neat sketch. Mention
their suitability also.
04
Design a strap footing to carry two column loads of 1000kN and 1800 kN.
The centre to centre distance between the columns are 6 m. Size of
column are 500 x 500 mm (1000 kN) and 600 x 600 mm (1800 kN).
Footing area under the columns are Respectively 1m x 2.8m and 2.8 x
2.8m connected by strap. Take SBC 205 kN/m2. Use M-20 concrete and
Fe-415 steel.
08
Q.3 Explain various steps in designing rigid raft foundation 06
What are the basic considerations in design of raft foundation, stating the
circumstances in which raft foundation is preferred
05
Section II
Q.4 What is pile group efficiency? How it is determined? 04
A pile 400 mm dia and 10 m length is cast in situ. Pile is constructed
through soil consisting of two layers mentioned below,
08
14 ∅
4 m thick top layer (from ground level)
17 ∅
6 m thick layer (below top layer)
Determine its static capacity if FOS=2
Q.5 What do you understand by scour depth and grip length? What is its
importance in Well foundation?
06
What are the merits and demerits of drilled pier and caisson foundation 05
Q.6 Show Yawing, Rocking and pitching with neat sketch. 06
Discuss the criteria for satisfactory performance of machine foundation 06