Jaypee Institute of Information Technology (JIIT) 2008 B.E Civil Engineering Test 3 : Underground Technology - Question Paper
JAYPEE UNIVERSITY OF INFORMATION TECHNOLOGY
WAKNAGHAT
MAXM. MARKS: 30COURSE CREDIT: 3
TEST-3 7* SEMESTER 2008
MAXM. TIME: I HRS 30 MIN.
COURSE CODE: 07B71CE422
COURSE NAME: UNDERGROUND TECHNOLOGY
Q. 1 Compare the methods of in-situ dcnsification in sands. Suppose as a project engineer, you are called upon to densify a deposit of loose sand. 30m deep. Which method of
densification will you adopt, and why*?
(4)
Q.2 Permeation grouting is to be executed in dry sandy gravel starting from a depth of 3 m below the ground surface down to a depth of 10 m. Grouting will be undertaken as ascending stage grouting in stages of 3 m, starting from 12 m depth and moving upward to 9 m. 6 m and 3 m depths. What is the maximum permissible grout pressure at 12 m depth? By what amount should this grout pressure be reduced for cach stage of ascent? The sandy gravel has V, * 18 kN /m , 0 * 40 and K$ = 0.45. (4)
Q.3 How arc conduits classified for the purpose of analysis? Explain in brief the ditch conduits and the positive projecting conduits. (4)
Q.4 A rigid pipe with an outside diameter of I m is laid in a ditch which is 1.5 m wide at the top of the pipe. The pipe is covered with 9.0m of sandy backfill (Ky7* 0.18). Determine the load on the pipe. Take V - 18 kN /m\ (4)
Q.5 List various methods for providing support to soil along the sides of an excavation. Explain the method of construction of diaphragm walls (4)
Q.6 What are small diameter tunnels? Describe briefly the techniques of small diameter tunneling. (4)
Q. 7 Write short notes on any two of the following.
a. Desirable characteristics of grouts
b. Ground improvement of saturated soft clay deposits
c. Relative merits of well points and deep wells (6)
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