Geotechnical Investigation for Construction of Underground Water Tank at ABC Housing Society, Gulistan-e-Jauhar,Karachi

1. SOIL MECHANICS-II (UE-405)
GEOTECHNICAL INVESTIGATION FOR
CONSTRUCTION OF UNDERGROUND WATER TANK AT
ABC HOUSING SOCIETY, GULISTAN-E-JAUHAR,
KARACHI
GROUP MEMBERS:
• Abdul Basit (UE-16045)
• Mehdi Raza (UE-16068)
• Moin Umar Khan (UE-16074)
• Barak Ullah (UE-16082)
PRESENTED TO:
Sir Shoaib Yaqub

2. FIELD TEST 1:
STANDARD PENETRATION TEST
Standard penetration test is a common in situ testing method used
to determine the geotechnical engineering properties of subsurface
soils
2 bore holes were drilled at a distance of 5ft with the help of rotary
drill. This test was carried out in accordance with the prescribed
procedure given in
BS 1377-9:1990. Groundwater table in both the boreholes was found
to be at 2.14m.

4. LAB TEST 1:
GRAIN SIZE ANALYSIS
The grain size analysis is conducted in two parts: for particles above
the # 200 US sieve, sieve analysis is carried out by passing the selected
soil sample from various sieves. For particles finer than the # 200 US
sieve, hydrometer analysis is carried out. This procedure of finding out
the size of particles is called the grain size analysis. This test was carried
out according to ASTM D-422.

6. LAB TEST 2:
NATURAL MOISTURE CONTENT
In this test, the moisture content of a soil sample is determined. The moisture content is given
as a percentage of its oven dried mass. The following formula is used:
ω =
M2 − M3
M3 − M1
Where
M1= weight of tin
M2=weight of moist soil + tin
M3=weight of dried soil +tin
This test was performed 2 times in each borehole in accordance with ASTM 2216-05.

7. Sr. No. Borehole No. Sample Depth (m) Natural moisture
content
1 BH-01 SPT-01 2.0 12.47
2 BH-01 SPT-03 4.0 15.82
3 BH-02 SPT-02 2.0 2.647
4 BH-02 SPT-04 5..0 2.651

8. LAB TEST 3:
SPECIFIC GRAVITY
Specific gravity (Gs) is defined as mass of material in air divided by mass of water
displaced by material. This quantity is used for calculation of void ratio, in hydrometer
test, etc. Specific gravity of four (04) samples was determined in accordance with the
procedure described in ASTM Designation C 127-81.

9. Sr. No. Borehole No. Sample Depth (m) Specific gravity
1 BH-01 SPT-01 2.0 2.609
2 BH-01 SPT-03 4.0 2.631
3 BH-02 SPT-02 2.0 2.647
4 BH-02 SPT-04 5..0 2.651

10. LAB TEST 4:
CHEMICAL TESTS
The following chemical tests were carried out on soil and water samples:
• Total dissolved solids
• Chloride content
• Sulphate content
• pH