Important RGPV Question
CE 802 (B) Foundation Engineering
VIII Sem, CE
UNIT 1- Selection Of Foundation And Sub-Soil Exploration/Investigation
Q.1) What are various types of footing? Mention the basic criteria for satisfactory performance of a foundation.
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Q.2) Describe the SPT method in brief. Also explain overburden and dilatancy correction on N value.
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Q.3) Why and in which situations soil stabilization techniques are required in field? Describe the electrical stabilization technique for improvement of soil.
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Q.4) Explain various characteristics of expansive and collapsible soils.
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Q.5) Explain Standard Penetration Test and corrections applied to observed N value. Illustrate test with figure.
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Q.6) Explain in detail the rotary drilling technique. State also its advantages over other methods of boring.
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Q.7) What do you understand by Geophysical method of soil exploration?
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Q.8) What is meant by N value? Why should we apply correction for the N value obtained from the field? Briefly explain the corrections.
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Q.9) What are the factors affecting the selection of type of foundations?
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Q.10) Explain any two boring methods with a neat sketch.
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UNIT 2- Shallow Foundation
Q.1) Explain the concept of general shear failure.
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Q.2) Explain what is meant by ‘safe bearing capacity’ of soil. Indicate how the bearing capacity of shallow footing in a given soil can be calculated from the strength characteristics of the soil such as cohesion and angle of internal friction?
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Q.3) The width and depth of a footing are 2m and 1.5m respectively. The water table at the site is at a depth of 3m below the ground level. Find the water table correction factor for the calculation of the bearing capacity of soil.
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Q.4) A footing of 4m x 4m carries a uniform gross pressure of 300 kN/m² at a depth of 1.5m in a sand. The saturated unit weight of the sand is 20 kN/m³ and the unit weight above the water table is 17 kN/m³. The shear strength parameters are c’ = 0, ‘ = 32°. Determine the factor of safety with respect to shear failure for the following cases:
i) The water table is at ground surface
ii) The water table is 1.5m below the surface
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Q.5) Determine net ultimate bearing capacity of the circular footing of size 2.5 m located at 1.5 m depth below ground level in pure clay soil for the following cases:
When water table is at-
(i) far below from foundation base
(ii) Ground level.
Consider the following soil characteristics, cohesion = 50 kPa and unit weight of soil is 18 kN/m³. Use Terzaghi’s theory.
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Q.6) What are the Factors affecting bearing capacity of the soil?
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Q.7) The plate load test was conducted on a clayey soil strata by using a plate of 0.3 m wide square and the ultimate load per unit area for the plate was found to be 180 kPa. What would be the ultimate bearing capacity (in kPa) of a 2m wide square footing?
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Q.8) A square footing 1.6 m x 1.6 m is placed over sand of density 17 kN/m³ and at a depth of 0.8 m. The angle of shearing resistance is 20°. The bearing capacity factors are Nq = 17.7, Nγ = 7.4 and Nc = 5.0. Determine the total load that can be carried by the footing.
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UNIT 3- Pile Foundations
Q.1) A 12 m long, 300 mm dia concrete pile is driven in a uniform deposit of dense sand. Water table is at great depth and is not likely to rise. The avg dry unit wt. of sand is 18 kN/m³. Use Nq = 137, calculate the safe load capacity of a single pile with a FOS of 2.5, ϕ = 25°.
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Q.2) For 450 mm side square section concrete pile 15 m long is driven in a deep deposit of uniform clay. The laboratory unconfined compression test on undisturbed sample indicates an avg value of UCS (Qu) = 75 kN/m². Calculate the ultimate load capacity of pile. Take α = 0.8, γsat = 18 kN/m³, γw = 10 kN/m³.
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Q.3) Give the classification of pile based on function or actions.
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Q.4) In a layered cohesive soil, bored piles of 300mm are installed. The top layer has a thickness of 5m and the bottom one is of considerable depth. The “c” value of top layer is 40kN/m² and that of the bottom is 100kN/m². Determine the length of the pile required to carry a safe load of 400kN. Assume F.O.S. of 3.
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Q.5) In a pile group, what are the geometrical properties that are to be considered in bringing out a proper spacing of piles? Explain.
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Q.6) Design a pile group to carry a load of 3500 kN including the weight of pile cap, at a site where the soil is uniform clay to a depth of 10 m underlain by rock. The average compressive strength of clay is 50 kN/m². The clay may be assumed to be of normal sensitivity and normally loaded with a liquid limit of 70%. Adopt a factor of safety 2.5 against shear failure.
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Q.7) What are the various approaches available to estimate the load carrying capacity of a single pile? Discuss the static formulae for pile capacity.
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Q.8) A group of 16 piles of 45cm diameter is arranged with a centre to centre spacing of 1.0m. The piles are 12m long and are embedded in soft clay with cohesion 20 kN/m². Bearing resistance may be neglected for the piles. Adhesion factor is 0.7. Estimate the ultimate load capacity of the pile group.
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Q.9) A drop hammer weighing 60 kN and having an effective fall of 0.75 m drives an RCC pile weighing 30 kN. The average settlement per blow is 1.4 cm. The total elastic compression is 1.8 cm. Assume the coefficient of restitution as 0.3 and a factor of safety is 3, determine the allowable load on pile.
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Q.10) A singly under-reamed, 8 m long RCC pile weighing 20 kN with 350 mm shaft diameter and 750 mm under-ream diameter is installed within the stiff, saturated silty clay (undrained shear strength is 50 kPa, adhesion factor is 0.3, and the applicable bearing capacity factor is 9) to counteract the impact of soil swelling on a structure constructed above. Neglecting suction and the contribution of the under-ream to the adhesion shaft capacity, what would be the estimated ultimate tensile capacity of the pile?
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Q.11) A singly under-reamed, 8 meter long RCC pile weighing 20 kN with a 350 mm shaft diameter and 750 mm under-ream diameter is installed within the stiff, saturated silty clay (undrained shear strength is 50 kPa, adhesion factor is 0.3, and the applicable bearing capacity factor is 9). To counteract the impact of soil swelling on a structure constructed above, what would be the estimated ultimate tensile capacity of the pile?
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UNIT 4- Foundations On Problematic Soil & Introduction To Geosynthetics
Q.1) Describe the Geosynthetics used for soil improvement technique.
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Q.2) Explain various characteristics of expansive and collapsible soils.
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Q.3) What are the problems and preventive measures of foundations on expansive soils?
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Q.4) Explain in detail about the concept of Under-reamed pile foundation and suitability criteria?
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Q.5) Explain in detail about the geosynthetics-materials and types.
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Q.6) What are the characteristics of expansive and collapsible soils?
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Q.7) What are the problems and preventive measures of foundations on collapsible soils?
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UNIT 5- Lateral Earth Pressure
Q.1) What are various types of lateral earth pressure? Derive the expression for calculating earth pressure at rest.
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Q.2) For an earth retaining structure shown in fig.1, construct earth pressure diagram for active state. Also find the total thrust per unit length of wall.
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Q.3) A retaining wall of 5 m height has a stratified backfill as shown in fig.2. Find out the magnitude of total active thrust on the wall and locate the point of application.
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Q.4) A 10m high retaining wall with smooth vertical back supports a horizontal backfill ( = 33°, c = 25kPa, Density above water table 15kN/m³ and below water table 18kN/m³). The water table is at a depth of 3m below the surface of the backfill. The backfill supports a surcharge of 10kPa. Determine the magnitude and line of action of passive earth pressure.
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Q.5) A retaining wall 6m high with a smooth vertical back retains a clay backfill with c’ = 12kN/m², = 18kN/m³ and = 180. Calculate the total active thrust on the wall if tension cracks may develop to the full theoretical depth.
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Q.6) What are the merits in Coulomb’s earth pressure theory as compared to Rankine’s theory? Discuss.
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Q.7) What are the different modes of failure of retaining walls? Explain with the help of neat sketches.
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Q.8) A 5m high rigid retaining wall has to retain a backfill of dry, cohesionless soil having the following properties: Angle of internal friction = 30°, void ratio = 0.74, specific gravity = 2.68. Plot the distribution of Rankine active earth pressure on the wall and determine the magnitude and point of application of the resultant thrust.
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Q.9) A retaining wall of height 5 m retains a sand fill, whose angle of internal friction, = 30° and unit weight is 118 kN/m³. Estimate the active earth pressure force and its position from bottom of wall.
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Q.10) Explain the Culmann’s graphical method.
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Extra Questions-
Q.1) List the various equipments used for field compaction. Also differentiate between light weight and heavy weight proctor test.
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Q.2) Define following terms-
Net pressure, Ultimate bearing capacity, Net ultimate bearing capacity, Net safe bearing capacity and Allowable bearing pressure.
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Q.3) Explain:
i) Disturbed and undisturbed sample
ii) CNS layer
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— Best of Luck for Exam —
