Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech IV Year SOIL MECHANICS Previous Question Paper (December - 2019 - R16)
Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks and may have a, b as sub questions.
PART - A
Summarize about moisture content in soils.
Answer
Moisture content, or water content, is defined as the ratio of the mass of water to the mass of solids in a given soil sample, expressed as a percentage. It is a fundamental index property that significantly influences the engineering behavior of soil, including its consistency, strength, and compressibility.
Outline about three phase system in soils.
Answer
Soil is a three-phase system consisting of solid particles, water, and air. These phases are represented as: 1) Solids (soil grains), 2) Water (liquid phase in voids), and 3) Air (gaseous phase in voids). The interaction between these phases determines the physical and mechanical properties of the soil mass.
Explain about uses of flownets.
Answer
Sign in to view the complete answer paper.
Explain about principle of effective stress in soils.
Answer
Sign in to view the complete answer paper.
Outline about stress distribution in soils.
Answer
Sign in to view the complete answer paper.
Explain about variation of vertical stress along the vertical plane and horizontal plane.
Answer
Sign in to view the complete answer paper.
Summarize about normally consolidated soil and over consolidated soil.
Answer
Sign in to view the complete answer paper.
Summarize about stress history of clay.
Answer
Sign in to view the complete answer paper.
Explain about critical void ratio in sands.
Answer
Sign in to view the complete answer paper.
Summarize about significance of shear strength in soils.
Answer
Sign in to view the complete answer paper.
PART - B
Explain the step by step procedure to identify the grain size from sieve analysis test and to grade the soil.
Answer
Sign in to view the complete answer paper.
Derive the relation between dry density and void ratio. Also, relation between relative density and dry density.
Answer
Sign in to view the complete answer paper.
Elaborate the step by step procedure for the laboratory determination of coefficient of permeability by using variable head method with the help of neat sketch.
Answer
Sign in to view the complete answer paper.
A sand deposit has a porosity of 30%. The ground water table is 2.5m below the ground surface. Evaluate the effective stress at a depth of 6m below ground surface if capillary rise is 1.5m above the water table. Take G=2.70.
Answer
Sign in to view the complete answer paper.
Explain about Newmark’s influence chart for irregular areas with a neat sketch.
Answer
Sign in to view the complete answer paper.
A concentrated load of 300kN acts on the surface of a soil. Determine the vertical stress increment at points directly under the load up to a depth of 10m and draw the plot.
Answer
Sign in to view the complete answer paper.
Discuss about Terzaghi’s one dimensional consolidation theory.
Answer
Sign in to view the complete answer paper.
A 8m thick clay layer with single drainage settles by 60mm in 24months. The coefficient of consolidation for this clay layer was found to be 8 × 10-2 cm2/sec. Determine the ultimate consolidation settlement and also the time taken for 50% consolidation.
Answer
Sign in to view the complete answer paper.
Explain about determination of shear strength using unconfined compression test.
Answer
Sign in to view the complete answer paper.
Discuss about Mohr-Coulomb equation for the determination of shear strength of soils.
Answer
Sign in to view the complete answer paper.
Assess Mohr failure envelope with a neat sketch.
Answer
Sign in to view the complete answer paper.
Discuss about consolidated undrained test in tri-axial test.
Answer
Sign in to view the complete answer paper.