GATE, PSUs- Soil Engineering - Notes- Part 4

Hello there,
Welcome to the part 4 of the one liners from Soil Engineering, which are useful for the preparation of GATE and other similar examinations.

• If the water table rises up to ground surface, effective stress is reduced due to increase in pore water pressure only but total stress does not change.
• The critical hydraulic gradient ic of a soil mass of specific gravity G and voids ratio e is given by (G-1)/(1+e).
• Quick sand is a flow condition occurring in cohesion-less soils.
• Effective stress on soil decreases with void ratio and permeability.
• Constant head permeability method is best suitable for determination of permeability of coarse grained soils, but Falling head permeability method is suitable for determination of permeability of clayey soils.
• co-efficient of permeability of soil increases with increase in temperature.
• The average co-efficient of permeability of natural deposits parallel to stratification is always greater than that perpendicular to stratification.
• The total discharge from two wells situated near to each other is less than the sum of the discharges from individual wells.
• The most suitable method for drainage of fine grained cohesive soils is electro-osmosis method.
• Vertical stress on a vertical line at a constant radial distance from the axis of a vertical load first increases, attains a maximum value and then decreases.
• Phreatic line in an earthen dam is parabolic.
• The hydraulic pressure on the phreatic line within a dam section is equal to atmospheric pressure.
• Rate of consolidation increases with increase in temperature.

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