Question

Knowledge questions (1 point/each) Correct Incorrect Fill-in answer The falling head permeability test is generally The constant head permeability test is generally The critical gradient is ratio of the field density Double ring infiltrometers are often performed to When there is large excavation below the on silty sands on clean sands over theb t den measure permeability for excavation p groundwater table pumping tests are generally to The symbol CL means: The failure of Teton dam was the result of Vibratory rollers are better suited for the compaction of Sheepfoot rollers are better suited for the compaction of A: Describe two geotechnical methods to reduce B: A: To calculate the critical gradient one needs to know the following soil properties: B: The two sets of lines in a flow net are: B: A: The authors of the three equations that define groundwater flow are: B: A: Factor of safety against piping is define as the ratio of A/ B, where:

Answer 1

1) Correct rightarrow Falling head permeability test is generally performed on soils which having left and low permeability (2) correct rightarrow constant head permeability test is generally performed on soils which having high permeability (3)correct (4)correct (5)correct (6) CL - Low compressible inorganic clay (7) Failure was attributed to piping through the joints in un sealed rock beneath the groot cap (8) Granular soils (for sands best method) (9) cohesive soils (clay 8) (10) Impermeable cot offs Grat curtains (11) i) Unit weight of soils ii)buoyant weight of soils iii) void ratio & specific gravity (12) i) Flow lines (ground water flow) ii) equipotential (distribution of potential energy) (13) Gilbert H.P. Ovde Michael G (14) A - Critical hydraulic gradient B - hydraulic gradient at exist