Match List-I (Property of soil) with List-ll (Laboratory equipment) an...
1. Constant head permeability test:
The coefficient of permeability for coarse-grained soil (Gravel and sand) is determined by means of the Constant-head permeability test. The degree of saturation of soil should be 100%.
By Darcy’s Law,
Q = k i A
Q=khA/L
k=QL/Ah
where, q = Discharge collected in time ‘t’, L = Distance between manometer taping points, A = Cross-sectional area of the sample, H = Difference in manometer levels i.e the head loss.
2. Consolidation Test:
(i) This is used to determine the rate and magnitude of soil consolidation when the soil is restrained laterally and loaded axially. This test is conducted by an Oedometer. As disturbing specimens have a certain pre-consolidation pressure, so for conducting the consolidation test undisturbed soil specimen is required.
(ii) Oedometer is used to find out the void ratio at the end of various stress levels and hence curve is plotted. This curve is useful in calculating the settlement of the soil layer.
(iii) Consolidation test is generally performed on clay soil.
3. Pycnometer test is used to determine the specific gravity of cohesion-less soils and water content.
4. Hydrometer test:
- Measuring the particle size distribution(Grain Size Analysis) of fine-grained soils like clay and silt is best performed using the soil hydrometer test
- The hydrometer analysis of soil, based on Stokes’ law, calculates the size of soil particles from the speed at which they settle out of suspension from a liquid.