ASSIGNMENT
1. CALCULATE THE ZERO AIR VOID UNIT WEIGHT FOR A SOIL (KN/CU.M.) AT w = 5%, 8%,
10%, 12% AND 15%, GIVEN Gs = 2.68.
2. THE RESULTS OF A STANDARD PROCTOR TEST ARE GIVEN IN THE TABLE. DETERMINE
THE MAXIMUM DRY UNIT WT. OF COMPACTION AND THE OPTIMUM MOISTURE CONTENT .
ALSO DETERMINE THE MOISTURE CONTENT REQUIRED TO ACHIEVE 95% OF Yd (max).
VOLUME OF PROCTOR
MOLD (CU.CM)
943.3
943.3
943.3
943.3
943.3
943.3
WT. OF WET SOIL IN THE
MOLD (KG)
1.65
1.75
1.83
1.81
1.76
1.70
MOISTURE CONTENT (%)
10
12
14
16
18
20
3. A FIELD UNIT WT DETERMINATION TEST FOR THE SOIL, DESCRIBED IN PROBLEM 2,GAVE
THE FOLLOWING DATA: MOISTURE CONTENT = 15% AND MOIST UNIT WEIGHT = 16.8
KN/M.
a. Determine the relative compaction
b. If Gs is 2.68, WHAT IS THE DEGREE OF SATURATION IN THE FIELD?
4. THE MAXIMUM AND MINIMUM DRY UNIT WTS OF A SAND WERE DETERMINED IN THE LAB
TO BE 16.5 KN/ CU.M. AND 14.5 KN/CU.M., RESPECTIVELY. IN THE FIELD , IF THE
RELATIVE DENSITY OF COMPACTION OF THE SAME SAND IS 70%, WHAT ARE ITS
RELATIVE COMPACTION AND DRY UNIT WT?
5. LABORATORY COMPACTION TEST RESULTS ON A CLAYEY SILT ARE LISTED IN THE
TABLE:
MOISTURE CONTENT
6
8
9
11
12
14
DRY UNIT WT (KN/CU.M)
14.80
17.45
18.52
18.9
18.5
16.9
FOLLOWING ARE THE RESULTS OF A FIELD UNIT WEIGHT DETERMINATION TEST ON THE
SAME SOIL WITH SAND CONE METHOD:
 Calibrated dry density of Ottawa Sand = 1570kg/cu.m
 Calibrated mass of Ottawa Sand to fill the cone = 0.545 kg
 Mass of jar + cone + sand (before use) = 7.59kg
 Mass of jar + cone + sand (after use) = 4.78 kg


Mass of moist soil from hole = 3.007 kg
Moisture content of moist soil = 10.2%
Determine the following:
a. dry unit weight of compaction in the field
b. relative compaction in the field
6. Find the flow rate in cu m/sec / m length ( at right angles to the cross section shown below) through
the permeable soil layer given H = 4m, H 1 =2m, h = 3.1m L = 30 m, Ø =14 degrees and k = 0.05
cm/sec.
h
H
Impervious layer
H1
Ø
Ø
L
7. In a constant head permeability test in the llaboratory, the following values are given L =250 mm
and A = 105 sq cm. if the value of k = 0.014 cm/sec and a flow rate of 120 cu cm/min must be
maintained through the soil, what is the head difference, h, across the specimen? Also, determine
the discharge velocity under the test conditions.
8.
For a falling head permeability test, these values are given:
 Length of the soil specimen = 200 mm
 Area of the soil specimen = 1000 mm
 Area of the standpipe = 40 sq.mm
 Head difference at time t = 0 at 500 mm
 Head difference at time t = 3 min @ 300 mm
Determine the hydraulic conductivity of the soil in cm/sec and what was the head
difference at time t = 100 sec?