Download ECIV-3433 Foundations Midterm Review Questions with Complete Solutions and more Exams Nursing in PDF only on Docsity!
ECIV-3433 Foundations Midterm Review Questions
with Complete Solutions
For a soil with a unit weight of 19.8kN/m^3 and a groundwater table at a depth of 10m from the ground surface, at the groundwater table depth (N1)60 = N60 (True or False) Correct Answer-False A clay soil with liquid limit of 100 and plastic limit of 20. For this soil, the undrained shear strength measured by a field vane test may underestimate the actual shear strength (True or False) Correct Answer- False Vesic' ultimate bearing capacity equation for shallow foundations is based on general shear failure mode (True or False) Correct Answer- True A soil sample collected in-situ by a piston sampler can be used for Atterberg limits test (True or False) Correct Answer-True For groundwater table within the failure zone of a shallow foundation, the y' in the third term of Terzaghi's ultimate bearing capacity equation is <= y - yw (True or Flase) Correct Answer-False A rectangular footing, 6m x 10m, with two-way eccentric loading, eb = 0.4m and eL = 1m, will have compression contact pressure along the entire footing (True or False) Correct Answer-True
Fine-grained soil samples recovered using thin wall (Shelby) tubes are in general less disturbed than samples recovered from the same soils using piston sampler (True or False) Correct Answer-False The bearing pressure under a continuous footing is 180 kPa while the allowable bearing capacity is 540 kPa. The factor of safety against shear failure is 3 (True or False) Correct Answer-False In subsurface investigations for a building of area 150 m2, a minimum of three boreholes is required (True or False) Correct Answer-True A shear vane 6.4 cm in diameter was pushed into an undistributed soil and rotated to measure the undrained shear strength. The maximum torque recorded in the vane was 0.15 N m. The undrained shear strength of the soil is: a) 15.6 kpa b) 100 kpa c) 156 kpa d) 427 kpa answer format: letter Correct Answer-c
c) 8.4% Answer Format: Letter Correct Answer-c In a pressuremeter test in a soft saturated clay, the measuring cell volume is 515 cm3, po = 42 kN/m2, pf = 326.5 kN/m2, vo = 46 cm3 and vf = 180 cm3. The pressuremeter modulus the soft saturated clay, Ep (assume soil Poisson's ratio = 0.5): a) 6Mpa b) 4Mpa c) 2Mpa d) 1Mpa Answer Format: Letter Correct Answer-b For a site with average subsurface conditions and a shallow foundation at a depth of 1.5 m for a 5 stories building, the minimum depth of the borehole for subsurface investigation is: a) 21m b) 16.9m c) 10.8m Answer Format: Letter Correct Answer-b
For a shallow foundation, the ultimate limits state is ensure by having: (a) Total settlement with tolerable limit (b) Differential settlement within tolerable limit (c) Global factor of safety against shear failure >= 2 (d) a and b answer format: letter Correct Answer-c For soil with a unit weight of 19.8 kN/m3 and a groundwater table at the ground surface, at depth of 10 m (N1)60 = N60 (True or False) Correct Answer-True For groundwater table below a shallow foundation and within the failure zone, the y' in the third term of Terzaghi's ultimate bearing capacity equation is <= y - yw (True or False) Correct Answer-False The bearing pressure under a shallow footing is 240 kPa while the allowable bearing capacity is 480 kPa. The factor of safety against shear failure is 2 (True or False) Correct Answer-False A soil sample collected in-situ by a piston sampler can be used for grain size distribution (True or False) Correct Answer-True Serviceability Limit States indicates the adequacy of the foundation against shear failure (True or False) Correct Answer-False
c) 4% Correct Answer-a A shear vane, 51 mm diameter and 102 mm long, was fully pushed into an undistributed soil and rotated to measure the undrained shear strength. The maximum torque recorded in the vane was 100 N m. The undrained shear strength of the soil is: a) 280kpa b) 206kpa c) 26kpa Correct Answer-b For a site with good subsurface conditions and a shallow foundation at a depth of 2 m for a six-stories building, the minimum depth of the borehole for subsurface investigation is: a) 23m b) 19.5m c) 12.5m Correct Answer-c For a shallow foundation, the serviceability limit state is ensure by having: a) Total settlement with tolerable limit b) Differential settlement within tolerable limit c) Global factor of safety against shear failure >= 2 d) All of the above e) (a) and (b) Correct Answer-e
Fine-grained soil samples recovered using thin wall (Shelby) tubes are in general less disturbed that samples recovered from the same soils using piston sampler (True or False) Correct Answer-False For soil with a unit weight of 19.8 kN/m3 and a groundwater table at the ground surface at depth of 10 m (N1)60 = N60 (True or False) Correct Answer-True The bearing pressure under a shallow footing is 280 kPa while the allowable bearing capacity is 280 kPa. The factor of safety against shear failure is 1 (True or False) Correct Answer-False The value of the factor of safety influences the magnitude of the nominal unit bearing capacity of a shallow foundation (True or False) Correct Answer-False Vesic' ultimate bearing capacity equation for a shallow foundation is based on general shear failure mode (True or False) Correct Answer- True For strip footing at depth D below the ground surface and supported by a layer of a saturated clay soil, the nominal unit bearing capacity of the footing for undrained condition increases by the increase of the width of the footing (True or False) Correct Answer-False
