USN 10cv64

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Sixth Semester B.E. Degree Examination, Dec.2013 I Jan.2Ol4Geotechnical Engineering - ll

Time: 3 hrs. Max. Marks:100

Note: 1. Answer any FIVE full questions, selecting

PART - AI a. Define terms with reference to ru-plirrgfrb., *ith a neat sketch. i.1 Inside clearance ratio

ii) Or,ri64,,clearance ratio iii) Area ratio iv) Recovery ratio. Indicate.Indicate the recommended values to get least disturbed samples. '- (08 Marks)

b. Explain briefly the spacing and depth of boring or open pit adopted for various civilengineering structures. (06 Marks)

c. Estimate ground watei,table, with the following .data : Depth upto which water boiledout : 15.0m ; Water ris.e ip first day : 0.80m ; Water rise in second duy :0.70m

;

Water rise in third day: 0.60m. (06 Marks)

2 a. What are the assumptions and limitations of Boussinesq theory of concentrated loads to

b.

c.

determine stresses in soil? ,

Explain contact pressure distribution in soils.Construct the Newmark's chart with an influence factor of 0.005 with 20 sectors and findthe vertical stress a point A Fig.Q2(c) at a depth of i 5m for the uniformly loaded area with a

load of 250kN/m2. (to_M-arks)

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a. What is flownet? List the properties of flow nets. Indicate the uses of flow net. (08 Marks)b.,,, What is Phreatic line? Enumerate the steps to obtain phreatic line in earthen dams with

filter. (08 Marks)c. For a homogeneous earthern dam 52m height and 2.0m free board. The flow net has 22

potential lines and 5 flow channels. Calculate the discharge per meter length of the dam.The K of the soil is 22 x 10-6 m/s. (04 Marks)

a. What are the assumptions and limitations of Rankine and Coulomb's earth pressuretheories? (07 Marks)

b. Explain Culmann's graphical method of finding out the Active earth pressure. (07 Marks)c. A retaining wall retains a cohensionless back fill with a height of 7.5m. The top 3.0m of the

backfill has a unit weight of 18kN/m3 and $ : 300. Lower 4.5m of the backfill has unitweight of 24kN/m3 and O : 200. Obtain pressure distribution diagram and determine thetotal active earth pressure and its point of application.

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(06 Marks)

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10cv64

PART - Ba. What are the causes of failure of slopes? Explain various types of failure of slopes.

(06 Marks)b. Explain method of slice to determine the factor of safety against failure of finite slope.

c. A canal having side slopes 1:1 is proposed to be constructed in a cohesive soil to f iffiT)f5m below g_round surface. The soil properties are as follows : 0, : 150 ; C,, : 12kNim2 .,

€ : 1 .0 ; G : 2.65. Find the factor of safety with respect to cohesion against failure of thebank slopes when the canal subjected to sudden drawdown of water. The stability number is0.t26, ,: , (04 Marks)

a. Define :' i), Ultimate bearing capacity ii) Net ultimate bearing capacity iiD Safebearing cdpacity ir) Allowable bearing pressure. (04 Marks)

b. Explain plate lo.pd,lest with neat sketches to determine bearing capacity soils. (10 Marks)c. A foundation 2.0in:!Quare is installed 1.2m below ground level in sandy soil having unit

weight of 19.2kN/# above water table and submerged'unit weight of 10.1kN/m2. tf b : O

and Q : 300. Find ultimate bearing capacity when i) Water table is well below the base of

foundation iit Water table rises to the base of foundation iii) Water table rises to

a. Explain importance and concept of settlement analysis. (06 Marks)b. Explain BIS specifications for total and differential settlement of footings and raft.1ot Marks)c. A 8.0m thick clay layer with singlehrainage settles by 120mm in 2 yeais. The coetficient of

consolidation for this clay was found to be 6 x 10-5mm2/S. Calculate the likely ultimateconsolidation settlement and find out how long it will take to undergo 90% of this

ground level. Take No :22 bnd N,: 20. :

settlement.

a. Enumerate the factors influencing the selection of depth of foundation,t

t

..,.b. What are the factors influencing allowable bearing pressure?c. Classify the.File foundation anJ explain briefly.

(06 Marks)

(06 Marks)

and choice of(08 Marks)(04 Marks)(08 Marks)

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