Page 13 - Building Regulation and Design Guidelines - Structural (Grey Code)

SECTION: 1 GEOTECHNICAL GUIDELINES & REGULATIONS SECTION: 1 GEOTECHNICAL GUIDELINES & REGULATIONS

1.2.24 Stating the depths range at which the ground water table was
encountered and to show if the ground water table is subjected to tidal 600 (kg/cm 2 ) Sample No: NU1
weather seasonal variations or by artificial induced effects. Therefore
reconfirmation is recommended prior to any works related to the ground 500 A 4 = 8.5
water regime. Standpipe peizometers to be installed inside minimum 400 B 2
two boreholes for each site after drilling and cleaning of drilling mud by 300 c = 1.10 0
clean water flushing for monitoring the ground water depth. Stress on piston, pst 200 1 2 4 6 8 10 (kg/cm 2 )
1.2.25 Conducting a number of field permeability tests (Falling head for soil (kg/cm 2 ) Sample No: NU2
and packer tests for consolidated and rock material) to measure the 100 4
conductivity of ground materials. 0 0 0.1 0.2 0.3 0.4 0.5 2 = 5.5
c = 1.90
0
0.2
0.1
1.2.26 Earth profile must be plotted using the findings of boreholes in different PENETRATION, INCHES 0 1 2 4 6 8 10 (kg/cm 2 )
ground sections as per Fig. (1.5).
1.2.27 Mentioning all the field and laboratory tests achieved in details and
illustrating the results properly as per Fig. (1.6). Fig. (1.6): Describing Soil Properties

BH.1 BH.2 BH.3 BH.4 BH.5 BH.6 BH.7 1.2.28 Chemical analysis to study the possible susceptibility of foundation
18.00m 18.00m 18.00m 18.00m 16.00m 37.00m
concrete to aggressive in-situ conditions and corrosivity and thereby to
GROUND FILL GROUND FILL GROUND FILL GROUND FILL GROUND FILL GROUND FILL
SAND
SAND SAND determine the concrete mix specifications by determining pH, Sulphur
SAND SAND SAND
SAND SAND SAND Trioxide and Chloride content of the soils and ground water. Minimum
SANDSTONE SANDSTONE SANDSTONE SANDSTONE
number to be considered should be three soil samples from above the
CONGLIMERATE CONGLIMERATE CONGLIMERATE
CONGLIMERATE
CONGLIMERATE ground water table, and three ground water samples for each plot.
CALCISILTITE CALCISILTITE CALCISILTITE CALCISILTITE CALCISILTITE
1.2.29 Recommendations for choice and the type of foundation based on the
geotechnical study carried out by the geotechnical engineer and the local
experience in the area.
BOREHOLE CROSS SECTION
Fig. (1.5). Earth Profile 1.2.30 Information about the seismicity of the area; Soil Profile Type to be
considered in the seismic analysis according to (Table 16-J) as per UBC
1997, Volume 2, ‘Structural Engineering Design Provisions’, Division IV
Compacation Curve 150
30 ZAV = zero air void curve Nonlinear peak = 43.4 ‘Earthquake Design’. Conduct a representative downhole / cross hole
Dry Unit Weight, (kN/m 3 ) 20 Maz. Dry Measured S = Shear stress (k Pa) 100 = 9.8 cv=36.2 based on the area of the site and geologic variations, to measure the
(G 8 = 2.70)
seismic logging test(s), Fig. (1.7), for an appropriate number of boreholes
25
= 44.6
100%
shear and primary seismic wave profiles and dynamic soil / rock
Unit Weight
80%
15
70%
parameters. Table (1.9) is for UBC 1997 Soil Profile Class Estimation.
50
10
moisture
Moisture
contents
Content, w
recommended).
0 5 Optimum opt at varying 0 0 50 100 150 200 1.2.31 Liquefaction analysis in case of reclaimed soil: (CPTU is highly
0 5 10 15 20 25
Water Content, w (%) Normal stress (k Pa) 1 mm = 0.03in
b) Shear strenghts envelopes 1 kPa = 0.145 lbf/in 2
Fig. (1.6): Describing Soil Properties
600 (kg/cm 2 ) Sample No: NU1
24 25