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Transcript of soil report
Date : 20/02/2012 Report No: RGT12-018
Form No. : FGT-03 Issue : 01/01.03.2007 Rev. : 00 Page 2 of 7
CCOONNTTEENNTTSS
Page No.
1 Introduction 03
1.1 General Geology of the Area 03
2 Project and Site Description 03
3
Field Work
04
3.1 Standard Penetration Test 04
4 Laboratory Testing 04
4.1 Determination of Particle Size Distribution 04
4.2 Chemical Analysis 04
5 Sub-surface Conditions
05
5.1 Sub-surface Lithology 05
5.2 Ground Water 05
6 Recommendations 06
6.1 Allowable Bearing Pressures(Shallow foundations) 06
6.2 Excavations 07
6.3 Foundation settlements 07
7 Foundation Concrete 07
Appendix A : Site Location Map
Appendix B : Borehole Logs
Appendix C : Laboratory Testing
Appendix D : Chemical Standard
Date : 20/02/2012 Report No: RGT12-018
Form No. : FGT-03 Issue : 01/01.03.2007 Rev. : 00 Page 3 of 7
1. INTRODUCTION
On the request of M/s. Erga Progress on behalf of the owner, a site investigation work has been carried
out by Universal Soil Testing Laboratory for the proposed project. The main object of investigation was
to determine the sub-surface conditions at the proposed site and to provide necessary geotechnical
information to aid the structural engineer in designing their foundation. This report presents the general
characteristics and variability of the ground, ground water conditions and the conclusions of the of the
geotechnical investigation. The scope of work include preliminary site visit to collect information about
the present site conditions, drilling of boreholes up to required depth and sampling disturbed and
undisturbed samples, Performing the necessary field and laboratory testing on samples, Obtaining the
subsurface lithology of the site and ground water conditions and developing conclusions and
recommendations on the basis of discussion and observations.
1.1 General Geology of the Area
The deposits of the United Arab Emirates coastline and the floor of the Arabian Gulf are of mostly
Pleistocene or recent in age. Dubai is a place where a hot arid climate prevails. Average annual rainfall
may only be a few centimeters and the summer shade temperatures are frequently in excess 40°C. The
contrast between night and day temperatures and night and day humidity is often high. 'Desert' is a
geologically recent feature, the result of prolonged sub-aerial erosion and deposition in an arid
environment. Most of the surface of the present day UAE is a sand desert, stretching from the Arabian
Gulf Coast south to the unbroken and uninhabited sands of the Empty Quarter and east to the gravel
plains bordering the Hajar Mountains. At Dubai and Sharjah coastline is dissected by channels or
creeks and consists of a beach dune complex with development of Subkha plains in the hinterland at
the head of the creeks. Recent sediments overlying aeolian carbonate sandstone are therefore
generally encountered with occasional development of bioclastic limestone. The surface level of the
sandstone varies appreciably over the area being exposed at the ground level in some localities in
Dubai and occurring at depths of up to ten or twelve meters elsewhere. Towards Sharjah the sandstone
passes literally into sand with cemented and sandstone layers, which is encountered to the depth of
penetration of normal site investigation boreholes.
2. PROJECT & SITE DESCRIPTION
The proposed project consist a G+1 Villa. The site is located on Plot No. RO.082(refer Appendix A) at
Dubai Land, Dubai-UAE. The plot covers approximately an area of 625.44m2. At the time of
investigation, the site area was flat and vacant. The plot is bordered with vacant plots and paved roads.
Site levels are related to temporary bench mark established at the adjacent paved road level (Access
Road).
Date : 20/02/2012 Report No: RGT12-018
Form No. : FGT-03 Issue : 01/01.03.2007 Rev. : 00 Page 4 of 7
3. FIELD WORK
The execution of field Work on the site commenced on 12/02/2012 and the work completed on
16/02/2012. The borehole points were shown and identified by the client as depicted in the site plan
presented in Appendix A. Two (2) boreholes were drilled up to a depth of 15.5m each using cable
percussion techniques (Rig No. : RM-03) as per BS 5930: 1999, Code of practice for site Investigations.
3.1 SPT (Standard Penetration Test)
In order to determine the relative density of the strata, SPT (standard penetration tests) were carried
out at every half meter interval up to the depth of 3.0m and there after at every one meter interval up to
the required investigation depth. SPT tests were performed in accordance with BS1377:1990 Part 9
AMD8264-95, “Determination of Penetration Resistance Using Split Barrel Sampler (SPT)”. The test
consists of driving a 50mm external diameter thick walled sampler into soil using 63.5kg hammer falling
freely from a height of 760mm. The number of blows required to achieve a penetration of 300mm, after
an initial seating drive of 150mm is recorded and termed as "N Value". Disturbed split spoon samples
from the boreholes were also collected and examined through the SPT tests. All the results of the site
work are logged in the attached borehole logs in Appendix B.
4. LABORATORY TESTING
Laboratory tests were carried out on selected samples recovered from the borehole in order to
determine the physical and chemical properties. The results of laboratory tests are presented in
Appendix C.
4.1 Determination of Particle size Distribution
Selected soil samples were mechanically analyzed for classification and comparison purposes. Tests
were carried out in accordance with BS 1377 Part 2: 1990 Clause. 9.2 and the results are presented in
Appendix C of this report.
4.2 Chemical Analysis
Soil samples from the borehole were selected and given to another independent laboratory for the
determination of chloride content, sulphate content and pH value. The results are presented in
Appendix C. Chemical analyses were performed as per the following standards.
• BS 1377 Part 3 : 1990 Clause 5 - Determination of sulphate content
• BS 1377 Part 3 : 1990 Clause 7 - Determination of chloride content
• BS 1377 Part 3 : 1990 Clause 9 - Determination of pH value
Date : 20/02/2012 Report No: RGT12-018
Form No. : FGT-03 Issue : 01/01.03.2007 Rev. : 00 Page 5 of 7
5. SUBSURFACE CONDITIONS
The findings of the borehole were generally consistent with the anticipated geology of the site.
5.1 Sub-surface lithology
The nature of sub surface lithology as encountered by borehole drilling is summarized below
Borehole # 1
Depth (m) Description of Strata
0.0 – 0.5 Light brown, silty, fine grained SAND.
0.5 – 3.0 Medium dense, light brown, silty, fine grained SAND.
3.0 – 4.0 Very dense, brown, silty, fine grained SAND with rare gypsum.
4.0 – 12.0 Very dense, brown, silty, fine grained CEMENTED SAND.
12.0 – 15.5 Very dense, reddish brown, silty, fine to medium grained CEMENTED SAND with
occasional conglomerate pieces.
Borehole # 2
Depth (m) Description of Strata
0.0 – 0.5 Light brown, silty, fine grained SAND.
0.5 – 3.0 Medium dense to dense, light brown, silty, fine grained SAND.
3.0 – 4.0 Very dense, brown, silty, fine grained SAND with rare gypsum.
4.0 – 12.0 Very dense, brown, silty, fine grained CEMENTED SAND.
12.0 – 15.5
Very dense, reddish brown, silty, fine to medium grained CEMENTED SAND with
occasional conglomerate pieces.
5.2 Ground Water
Observations concerning ground water were made during drilling and at completion of the field work.
Measurements of ground water levels were taken on the next day of drilling completion of each
borehole. Measured ground water table may be expected to vary due to the seasonal and tidal
fluctuations or any dewatering in the vicinity.
Ground Water table on the boreholes
Borehole No. Drilled Depth (m) Ground Water level (m)
BH 1 15.5 8.80
BH 2 15.5 8.70
Date : 20/02/2012 Report No: RGT12-018
Form No. : FGT-03 Issue : 01/01.03.2007 Rev. : 00 Page 6 of 7
6. RECOMMENDATIONS
Based on the test results and discussion, our recommendations are provided for the foundation design
and construction.
6.1 Allowable Bearing Pressures (Shallow Foundations)
6.1.1 Isolated/Strip at level 1.0m to 1.5m below
The foundation depth may vary according to the architectural requirement. However, the foundations
can be placed at a minimum depth of 1.0m below the Adjacent Paved Road (Access Road) Level. Prior
to construction, the top soil has to be excavated to at least 1.0m depth below the Road Level. The
excavated ground shall be inspected by an experienced engineer and if any soft spots are encountered
shall be removed and replaced with well compacted granular materials. The founding level at this layer
shall be tested for in-situ density of not less than 95% of its MDD. Covering with a layer of concrete
blinding should then protect the top surface.
Based on the standard penetration tests, practical experience and the empirical equations developed
by Terzaghi, Meyerhof and Bowels, below mentioned allowable bearing pressures were determined
considering shallow foundation at the above specified depth.
Foundation Bearing Capacity
Isolated/Strip up to max. width 3.0m 130 kN/m²
Isolated/Strip of 3.0-5.0m width 120 kN/m²
6.1.2 Isolated/Strip or Raft at level 3.0m to 4.0m below
The foundation depth may vary according to the architectural requirement. However, the foundations
can be placed at a minimum depth of 3.0m below the Adjacent Paved Road (Access Road) Level. Prior
to construction, the top soil has to be excavated to at least 3.20m depth below the Road Level. The
excavated ground shall be inspected by an experienced engineer and if any soft spots are encountered
shall be removed and replaced with well compacted granular materials. Place at least one layer of
granular road base material of compacted thickness 0.20m at the foundation formation layer. The
founding level at this layer shall be tested for in-situ density of not less than 98% of its MDD. Covering
with a layer of concrete blinding should then protect the top surface.
Foundation Bearing Capacity Modulus of Sub grade ‘k’ value
Isolated/Strip up to 5.0m width 160kN/m² -
Raft Foundation 170 kN/m² 17850 kN/m3
APPENDIX A
SITE LOCATION MAP
APPENDIX B
BOREHOLE LOGS
Report No. : RGT12-018 Date : 20/02/2012
Borehole No. : 1Client : M/s. Erga Progress Eng. & Consultants Borehole Depth (m) : 15.5Project : Proposed G+1 Villa Co-ordinates : Not GivenLocation : Plot No. RO.082, Dubailand, Dubai-UAE Drilling Method : Light cable PercussionGround Level : Flat Drilling Fluid : Water Drilling Started on : 12/02/2012 Depth of Casing Used (m) : 3.0Drilling Completed on : 13/02/2012 Inside Dia of Casing(mm) : 150Core Dia : Not Applicable Core Barrel : Not Applicable
N' Values TCR SCR RQD0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
6.5
7
7.5
8
8.5
9
9.5
10
TCR : Total core recovery SCR : Solid core recovery RQD : Rock quality designation
Ground Water Level (m) : 8.8 Date & Time of Water Level Measured : 13/02/2012 @ 10.00am
Remarks : None Driller Name : Raju Rig No. : RM-03
Form No. : FGT-01 Issue : 01/01.03.2007 Rev. : 01/26.05.2009 Page 1 of 2
Very dense, brown, silty, fine grained
CEMENTED SAND.
Light brown, silty, fine grained SAND.
Medium dense, light brown, silty, fine grained
SAND.
Borehole Log
Strata
Symbol
Depth
(m)Strata Description
Core RecoveryWater
Level
Sample
Type
Standard Penetration Test (No. of blows)
150mm 150mm 150mm
SPT
SPT
SPT
SPT
SPT
SPT
SPT
SPT
SPT 50/80 R
50/100
25/100
50/80mm
50/70mm25/80 50/70 RSPT
25/85
SPT
50/80
25/70
SPT 25/90
SPT R 50/80mm
50/95mm50/95 R
47
20
10 12
11
19
R 50/105mm
50/100mm
50/155mm
6
6
4
22
10 13
6
18
25/95
50/105
50/85mm
25/110
50/85 R
R
3/5
8 12
Very dense, brown, silty, fine grained SAND
with rare gypsum.
Request No. : QGT12-018
23
20
11 30
9
5
Continued on next page...
0.5m
4.0m
0.5m
4.0m
3.0m
Report No. : RGT12-018 Date : 20/02/2012
Borehole No. : 1Client : M/s. Erga Progress Eng. & Consultants Borehole Depth (m) : 15.5Project : Proposed G+1 Villa Co-ordinates : Not GivenLocation : Plot No. RO.082, Dubailand, Dubai-UAE Drilling Method : Light cable PercussionGround Level : Flat Drilling Fluid : Water Drilling Started on : 12/02/2012 Depth of Casing Used (m) : 3.0Drilling Completed on : 13/02/2012 Inside Dia of Casing(mm) : 150Core Dia : Not Applicable Core Barrel : Not Applicable
N' Values TCR SCR RQD10.5
11
11.5
12
12.5
13
13.5
14
14.5
15
15.5
TCR : Total core recovery SCR : Solid core recovery RQD : Rock quality designation
Ground Water Level (m) : 8.8 Date & Time of Water Level Measured : 13/02/2012 @ 10.00am
Remarks : None Driller Name : Raju Rig No. : RM-03
Form No. : FGT-01 Issue : 01/01.03.2007 Rev. : 01/26.05.2009 Page 2 of 2
Request No. : QGT12-018
50/70mm
25/90
25/40
25/60
25/55
25/80
50/50mm
50/55mm
R 50/35mm
50/65mm
50/50 R
50/70
50/65 R
R
50/55 R
50/35
SPT
SPT©
SPT©
SPT©
SPT
Water
Level
Sample
Type
Standard Penetration Test (No. of blows)
150mm 150mm 150mm
Core Recovery
Borehole Log
Strata
Symbol
Depth
(m)Strata Description
Very dense, reddish brown, silty, fine to
medium grained CEMENTED SAND with
occasional conglomerate pieces.
End of borehole 15.5m
12.0m
End of borehole 15.5m
Report No. : RGT12-018 Date : 20/02/2012
Borehole No. : 2Client : M/s. Erga Progress Eng. & Consultants Borehole Depth (m) : 15.5Project : Proposed G+1 Villa Co-ordinates : Not GivenLocation : Plot No. RO.082, Dubailand, Dubai-UAE Drilling Method : Light cable PercussionGround Level : Flat Drilling Fluid : Water Drilling Started on : 15/02/2012 Depth of Casing Used (m) : 3.0Drilling Completed on : 16/02/2012 Inside Dia of Casing(mm) : 150Core Dia : Not Applicable Core Barrel : Not Applicable
N' Values TCR SCR RQD0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
6.5
7
7.5
8
8.5
9
9.5
10
TCR : Total core recovery SCR : Solid core recovery RQD : Rock quality designation
Ground Water Level (m) : 8.7 Date & Time of Water Level Measured : 16/02/2012 @ 12.40pm
Remarks : None Driller Name : Raju Rig No. : RM-03
Form No. : FGT-01 Issue : 01/01.03.2007 Rev. : 01/26.05.2009 Page 1 of 2
Request No. : QGT12-018
25
27
9 22
12
4
5
4
9/15
50/120 R 50/120mm
9
16
22
6
34
29/11521 50/265mm
50/165mm
12/30 50/180mm
16
14 20
15
13
11
7 9
14
50/130mm50/130 R
R 50/95mm50/95
25/100
SPT 25/95
SPT
SPT
25/80
SPT
25/85 50/100 R
50/135mm
50/100mm
R
SPT
SPT 50/13525/130
41
38
25/145
SPT
SPT
SPT
SPT
SPT
SPT
SPT
Water
Level
Sample
Type
Standard Penetration Test (No. of blows)
150mm 150mm 150mm
Core Recovery
Borehole Log
Strata
Symbol
Depth
(m)Strata Description
Light brown, silty, fine grained SAND.
Medium dense to dense, light brown, silty,
fine grained SAND.
Very dense, brown, silty, fine grained SAND
with rare gypsum.
Very dense, brown, silty, fine grained
CEMENTED SAND.
Continued on next page...
0.5m
4.0m
0.5m
4.0m
3.0m
Report No. : RGT12-018 Date : 20/02/2012
Borehole No. : 2Client : M/s. Erga Progress Eng. & Consultants Borehole Depth (m) : 15.5Project : Proposed G+1 Villa Co-ordinates : Not GivenLocation : Plot No. RO.082, Dubailand, Dubai-UAE Drilling Method : Light cable PercussionGround Level : Flat Drilling Fluid : Water Drilling Started on : 15/02/2012 Depth of Casing Used (m) : 3.0Drilling Completed on : 16/02/2012 Inside Dia of Casing(mm) : 150Core Dia : Not Applicable Core Barrel : Not Applicable
N' Values TCR SCR RQD10.5
11
11.5
12
12.5
13
13.5
14
14.5
15
15.5
TCR : Total core recovery SCR : Solid core recovery RQD : Rock quality designation
Ground Water Level (m) : 8.7 Date & Time of Water Level Measured : 16/02/2012 @ 12.40pm
Remarks : None Driller Name : Raju Rig No. : RM-03
Form No. : FGT-01 Issue : 01/01.03.2007 Rev. : 01/26.05.2009 Page 2 of 2
Borehole Log
Strata
Symbol
Depth
(m)Strata Description
Core RecoveryWater
Level
Sample
Type
Standard Penetration Test (No. of blows)
150mm 150mm 150mm
SPT
SPT©
SPT©
SPT©
SPT
50/40 R
50/45
50/55
50/80 R
R
50/80mm
50/85 R
R 50/45mm
50/40mm
25/45
50/85mm25/80
25/55
Request No. : QGT12-018
50/55mm
25/55
25/40
Very dense, reddish brown, silty, fine to
medium grained CEMENTED SAND with
occasional conglomerate pieces.
End of borehole 15.5mEnd of borehole 15.5m
12.0m
End of borehole 15.5m
Report No. : RGT12-018 Date : 20/02/2012
APPENDIX C
LABORATORY TESTING
Report No. : RGT12-018 Date : 20/02/2012
Request No. : QGT12-018 Borehole No. : 1
Sample No. : SGT12-018/01-1.5 Depth (m) : 1.5
Location : Plot No. RO.082, Dubailand, Dubai-UAE Source : Site
Sample Size (g) : 562.8
Sample Description : Sand
Sampling Method : BS 5930 Cls 22
Initial Sample Preparation : BS 1377 Part 1 : 1990 Cls 7.3 and 7.4.5
Test specimen Preparation : BS 1377 Part 2 : 1990 Cls 9.2.3
Test Method : BS 1377 Part 2 : 1990 Cls 9.2.4
Test Method Variation : None
Remarks : None
Date Tested : 12-14/02/2012
Tested By : AN
TEST RESULTS
* Results relates only to the items tested.
* Reports shall not be reproduced (except in full) without written approval of the laboratory.
Form No. : FGT-04 Rev. : 00 Page 1 of 1
Issue : 01/01.03.2007
REPORT ON PARTICLE SIZE DISTRIBUTION
0.300 96
0.212 88
TEST SIEVE SIZE( mm) PERCENTAGE
PASSING
0.425 99
1.18 100
0.600 99
30.063
690.150
0
10
20
30
40
50
60
70
80
90
100 0.00
0.01
0.10
1.00
10.00
100.00
1000.00
BS Sieve aperture Size (mm)
Percentage Passing
SAND
CLAY / SILT
% )
GRAVEL
COBBLE
BOULDERS
Date : 20/02/2012
Report No. : RGT12-018
1.5
1
BS Classification
Depth (m)
Borehole No.
Sample No.
SGT12-018/01-1.5
silty, fine grained SAND.
fine
medium
coarse
fine
medium
coarse
medium
coarse
fine
0.002
0.006
0.02
0.06
0.2
0.6
2.0
6.0
20
60
200
Report No. : RGT12-018 Date : 20/02/2012
Request No. : QGT12-018 Borehole No. : 1
Sample No. : SGT12-018/01-1.0 Depth (m) : 1.0
Location : Plot No. RO.82, Dubailand, Dubai-UAE Source : Site
Sample Size (g) : 500.0
Sample Description : Sand
Sampling Method : BS 5930 Cls 22
Sample Preparation : BS 1377 Part 3 : 1990 Cls.7.2.3 Amd.9028-96 (Chloride)
: BS 1377 Part 3 : 1990 Cls.5.3 Amd.9028-96 (Sulphate)
: BS 1377 Part 3 : 1990 Cls.9.4 Amd.9028-96 (pH Value)
Test Method : BS 1377 Part 3 : 1990 Cls.7.2 Amd.9028-96 (Water Extraction) (Chloride)
: BS 1377 Part 3 : 1990 Cls.5.5 Amd.9028-96 (Water Extraction) (Sulphate)
: BS 1377 Part 3 : 1990 Cls.9 Amd.9028-96 (pH Value)
Test Method Variation : None
Remarks : None
Date Tested : 14-18/02/2012
Tested By : SC*
TEST RESULTS
Results relates only to the items tested.
Reports shall not be reproduced (except in full) without written approval of the laboratory.
* Test was subcontracted.
Form No. : FGT-05 Issue : 01/01.03.2007 Rev. : 00 Page 1 of 1
REPORT ON CHLORIDE, SULPHATE AND pH IN SOIL SUSPENSION
0.01
Parameter
Water Soluble Chloride as Cl-
%
pH Value at 200C
Unit Result
0.3
8.8
g/LWater Soluble Sulphate as SO3
pH Units
APPENDIX D
CHEMICAL STANDARD
Report No. : RGT12-018 Date : 20/02/2012
Report No. : RGT12-018 Date : 20/02/2012