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Advanced Geo Technology Engineering (April 2010)

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Total No. of Questions : 12] [Total No. of Pages : 4 [3764]-105 P1590 B.E. (Civil) ADVANCED GEO TECH. ENGINEERING (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates : 1) Answer 3 questions from each section. 2) Answers to the two sections should be written in separate answer books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables in allowed. 6) Assume suitable data, if necessary. SECTION - I Q1) a) Explain significance of classification of soils. What are the different systems of classification of soil, and state the basis on which each system classify soils. [7] Cu = 4 and Cc Cu Cc = 9, where, Cu and Cc represent co-efficient of uniformity and coefficient of curvature, respectively. If, effective grain size of soil is 0.1 mm, determine Cu, Cc, D60, D30 and coefficient of permeability. [5] b) On carrying out dry sieve analysis, it is noticed that, c) Explain the following two fundamental building blocks involved in the formation of clay mineral structure : [6] i) Tetrahedral unit. ii) Octahedral unit. OR Q2) a) State the criteria that should be satisfied for classifying following soils: SW GP SM MH CI ML. [6] P.T.O. b) Explain with the help of neat sketches distinction between the following : [6] i) Single grained structure and honeycombed structure. ii) Flocculant and dispersed structure. c) On carrying out liquid limit and plastic limit test, on a soil sample, following observations are made : [6] % water content when 25 number of blows required to close the gap = 85. Flow index = 0.75 Plastic limit = 25 Natural water content = 65. Determine : i) Toughness index ii) Consistency index iii) Compression index iv) Classify soil. Q3) a) State two classical earth pressure theories and the basic assumptions made in these theories. [5] b) Derive an expression for critical height Hc of an unsupported vertical cut in cohesive soil. [4] c) A retaining wall 4 m high, has a smooth vertical back. The backfill has a horizontal surface in level with the top of the wall. Find total active earth pressure and its point of application using the following data :[7] i) Uniformly distributed surcharge of 30 kN/m 2 intensity over backfill. ii) Properties of backfill r = 18 kN/m3, = 30 & C = 0. iii) Water table is 1.5 m below the top of the wall. OR Q4) a) Explain Rebhann s graphical method to determine lateral earth pressure with a neat sketch. [5] b) State the criteria for design of gravity retaining wall. [4] c) A retaining wall 10 m high retains a cohesionless soil having an angle of internal friction of 30 . The surface of the soil is level with the top of the wall. The top 3 m of the fill has a unit weight of 20 kN/m3 and that of the rest is 30 kN/m3. Find the magnitude per metre run and point of application of the resultant active thrust. Assume the same for both the strata. [7] [3764]-105 -2- Q5) a) Draw a tree type chart showing different types of geotextiles. Also state important characteristics of each type. [4] b) Draw illustrative labelled sketches showing 4 applications of geotextiles. [4] c) Draw a neat diagram of vertical reinforced earth retaining wall. Explain how length of reinforcement, sectional area of reinforcement is designed. Show on the diagram length, extent and zone of providing reinforcement is provided. [8] OR [2] Q6) a) State the four functions for which geotextiles can be used. b) Draw illustrative sketches showing examples of use of the four functions of geotextiles. Also explain procedure for laying of geotextiles. [6] c) Explain the circumstances/examples under which it is [2] i) Advisiable to use geotextiles. ii) Not advisiable to use geotextiles. d) Explain the design measures to be taken to guard against failure of grouted soil nails. [6] SECTION - II Q7) a) Draw a neat sketch of a curve of strain (X axis) and stress (Y axis) for determination of soil modulus. From this curve explain and demonstrate how would you determine tangent modulus. State where the value of tangent modulus is maximum. b) Explain how would you calculate analytically elastic settlement of foundations. c) Draw a neat sketch of frequency f (X axis) and soil response (Y axis) and explain its behaviour and state how would you calculate critical frequency. d) Define spring constant. Explain how would you determine the same in field as well as from laboratory tests. [17] OR Q8) a) Draw a smooth curve of strain and stress and state how would you determine secant modulus from the curve. Also explain how would you determine the same by empirical method. b) Define tolerable settlement. Explain the factors affecting the same by giving any two numerical examples. [3764]-105 -3- c) Draw a neat sketch of general layout of machine foundation showing foundation block, pedustal, machine and vibrating soil and explain the concept of soil mass. Also indicate how would you determine emperically the same. d) Explain with a sketch the concept of damping constant also discuss what are two types of damping in soil? [17] Q9) a) Explain the following with reference to dynamic consolidation with sketches : i) Procedure in details ii) Where useful and why iii) Field control-adopted. b) Explain the following with reference to sand drain and blanket. i) Draw a neat sketch of proposal in plan and section. ii) Principle involved. iii) Specifications for drain & blanket. [17] OR Q10) a) Explain by drawing a table showing size of soil grain with classification (X axis) and eight different methods used for in place treatment on other axis. b) Explain the following with reference to blasting. i) General Procedure. ii) Specifications. iii) Precaution. [17] Q11) Explain sketches the following models with their mathematical formulation and graphical presentation. [16] a) St. Venant Model. b) Maxwell Model. c) Kelvin Voieht Model. OR Q12) Starting with three fundamental models of elastic, viscous and friction develop the models suggested by Burger and Bingham and present them with sketch, mathematical and graphical presentation. [16] rrrr [3764]-105 -4-

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Additional Info : April 2010 Examination - Advanced Geo Technology Engineering (2003 Course)
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