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Exam (elaborations)

Soil Mechanics Questions and Answers Fully Solved 100%

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  • Course
  • Soil Mechanics
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  • Soil Mechanics

accuracy of k determined in lab depends on 6 variables - ️️temperature of fluid, viscosity of fluid, trapped air bubbles present in soil specimen, degree of saturation of the soil specimen, migration of fines during testing, and duplication of field conditions in the lab boutwell permeamete...

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  • November 18, 2024
  • 4
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • Soil Mechanics
  • Soil Mechanics
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PatrickKaylian
Soil Mechanics
accuracy of k determined in lab depends on 6 variables - ✔️✔️temperature of fluid,
viscosity of fluid, trapped air bubbles present in soil specimen, degree of saturation of
the soil specimen, migration of fines during testing, and duplication of field conditions in
the lab


boutwell permeameter - ✔️✔️hole is drilled and casing placed in it. casing filled with
water and falling-head permeability test is conducted, hole is deepened, repeat

hydraulic gradient - ✔️✔️i = ∆h/L

Darcy's Law - ✔️✔️discharge velocity of water through saturated soils
v = ki k is hydraulic conductivity (coefficient of permeability)

seepage velocity - ✔️✔️velocity of water through void space

constant-head test - ✔️✔️laboratory determination of hydraulic conductivity where the
difference of head between inlet and outlet remains constant

falling-head test - ✔️✔️laboratory determination of hydraulic conductivity where water
from a standpipe flows through a soil. head difference and time are recorded at t1 and
t2

hydraulic conductivity and void ratio for granular soils - ✔️✔️increases linearly

3 methods to estimate in situ hydraulic conductivity of compacted clay soils -
✔️✔️boutwell permeameter, constant-head borehole permeameter, porous probes


Permeability - ✔️✔️soils permeable due to existence of interconnected voids through
which water can flow from high energy points to low energy points


constant-head borehole permeameter - ✔️✔️constant head is maintained by supplying
water, rate of flow q is measured

porous probes - ✔️✔️driven into soil, constant or falling-head permeability test is
performed

laboratory consolidation tests - ✔️✔️hydraulic conductivity of saturated cohesive soils
can be determined

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