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Calculate the following:

1. Voids Ratio

2. Degree of Saturation

3. Bulk unit weight of the moist soil

4. Dry unit weight

**Question 1.1**

A **falling-head permeability test **was carried out on a silty soil.

The soil specimen length is 158.0mm.

The specimen diameter is 101.6mm.

The water temperature is 20oC.

The cross-sectional area of the standpipe is 183square millimetres

The water level in the standpipe at the beginning of the test h1 was 1.200m.

The water level in the standpipe at the end of the test h2 was 1.100m.

The time required for the standpipe water level to drop from h1 to h2 was 20.0minutes.

*Calculate the coefficient of permeability.*

*Comment on the permeability of the soil.*

**Question 1.2**

The mass of a **moist sample **of soil is 20.7 kg.

The total volume of the sample before drying is 0.011m3

The mass of the dry sample was found to be 17.3 kg.

The specific gravity of the solids particles is 2.68

Determine

a) Voids ratio

b) Degree of saturation

c) Bulk unit weight of the moist soil

d) Dry unit weight

**Question 1.3**

The voids ratio of an undisturbed soil sample is 0.94

The Degree of Saturation of the sample is 35%

The specific gravity of the solids particles is 2.71

Hint assume overall volume of the sample is 1.0m³

Determine

a) Water content

b) Bulk unit weight

**Question 1.4**

The effective pressure is required 8.0 metres below the ground surface.

The soil profile consists of a layer of sand (SW) 4.0 metres deep, and under that there is

sandy silt (MS).

The water table is 2.0m below the ground surface. Tests indicate that:

For the sand, γ = 15.0kN/m3, and γ SAT= 17.0kN/m3

For the silt, γ SAT= 18.0kN/m3

Calculate the following:

Total stress at 2.0 m depth.

Effective stress at 2.0 m depth.

Pore pressure at 2.0 m depth.

Total stress at 4.0 m depth.

Effective stress at 4.0 m depth.

Pore pressure at 4.0 m depth.

Total stress at 8.0 m depth.

Effective stress at 8.0 m depth.

Pore pressure at 8.0 m depth.

Question 1.1 A falling-head permeability test was carried out on a silty soil. The soil specimen length is 158.0mm..

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