PROPOSED CONSTRUCTION OF RESIDENTIAL BUILDING (G+2...
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PROPOSED CONSTRUCTION OF RESIDENTIAL BUILDING (G+2
UPPER FLOORS) AT S.NO:156/1A1A1A2, 1ST CROSS STREET,
NEW BALAJI NAGAR, SELAIYUR, CHENNAI - 600 073.
Report on Geotechnical Investigation
Client: M/s. Alankar Construction,
No-12A, Bharathi Poonga Street,
Selaiyur , Tambaram,
Chennai-600 073.
MARS SYNERGY GEOTECH Pvt Ltd
An ISO 9001: 2015 Certificate Company
Plot #:206, 3rd Link Street, Nehru Nagar, Kottivakkam, OMR, (Kandanchavadi), Chennai-600 041.
Mail : [email protected], [email protected], Web: www.msgeotech.com
Project No: MSGTPL/SI-4001/18-19 Apr-2018
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Geo-Technical Investigation Report
Project No: MSGTPL/SI-4001/18-19 APr-2018.
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Proposed Construction of Residential Building (G+2 Upper Floors) at Selaiyur
TABLE OF CONTENTS
1.0 INTRODUCTION……………………………………………………………………. 1
1.1 DESCRIPTION OF STRUCTURE………………………………………………… 1
1.2 SOIL INVESTIGATION PROGRAMME …………………………………………. 1
1.3 FIELD SAMPLING……………………………………………….………………… 2
1.4 LABORATORY TESTS…………………………………………………………… 2
1.5 SOIL PROFILE………………………………………………………………………. 2
1.6 GROUND WATER TABLE……………………………………………………….. 3
1.7 DISCUSSION ON FOUNDATION…………………………………………………. 3
1.8 RECOMMENDATIONS……………………………………………………………. 3
2.0 SAFE BEARING CALCULATIONS.................................................................. 4
3.0 SITE PLAN –MSGTPL/SI-4001……………………………………………………. 5
4.0 BORE-LOGS………………………………………………………………………… . 6
5.0 TEST RESULTS…………………………………………………………………….. 8
6.0 NATURAL MOISTURE CONTENT……………………………………………….. 10
7.0 SPECIFIC GRAVITY…………………………………………………………………. 12
8.0 GRAIN SIZE ANALYSIS…………………………………………………………….. 14
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Geo-Technical Investigation Report
Project No: MSGTPL/SI-4001/18-19 APr-2018.
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Proposed Construction of Residential Building (G+2 Upper Floors) at Selaiyur
REPORT ON SUBSOIL INVESTIGATION AND RECOMMENDATIONS FOR
SUITABLE TYPE OF FOUNDATION FOR THE PROPOSED CONSTRUCTION OF
RESIDENTIAL BUILDING (G+2) AT SELAIYUR.
1.0 INTRODUCTION
M/s. Alankar Construction, Chennai is planning to construct the residential building
(G+2) at S.No:156/1A1A1A2, 1st Cross Street, New Balaji Nagar, Selaiyur, Chennai -
600 073, Tamil Nadu, INDIA. M/s. Mars Synergy Geotech Pvt Ltd, Chennai has
carried out this investigation and completed the field work on 3rd Apr 2018 as per
instructions from the owner of the project.
The scope of work includes the following
Making two numbers of Standard Soil Investigation bore-holes
Collecting soil samples at regular depth intervals
Conducting SPTs at every 1.0m/1.50m depth intervals
Conducting laboratory tests on samples collected
Submitting report with laboratory test results and recommendations for
foundations.
1.1 DESCRIPTION OF STRUCTURE
The proposed structure is residential building (G+2 upper floors). The exact details of
columns are not available at the time of preparation of this report. Assuming an
approximate column spacing of 4 to 5 m c/c considering this the central column load
works about 60 to 80tones for proposed building. These loads are assumed for
foundation only and for the structural design, exact loads are to be estimated based on a
suitable structural analysis.
1.2 SOIL INVESTIGATION
The field investigation works were carried out using 1 set of Rotary mechanical drilling
Rig. The following activities, carried out in chronological sequence, comprised the
fieldwork for the project
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Geo-Technical Investigation Report
Project No: MSGTPL/SI-4001/18-19 APr-2018.
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Proposed Construction of Residential Building (G+2 Upper Floors) at Selaiyur
• Mobilization of rotary drill rig, water pump, testing tools and accessories.
• Collection of disturbed samples of non-cohesive soils.
• Sampling and logging of the boreholes. Packing, labeling and dispatching the
samples to laboratory.
• Field investigation, tests and laboratory tests conducted as per IS-1892 and IS -2720
1.3 FIELD SAMPLING
Two numbers of standard soil investigation boreholes of 100mm diameter was made at
the locations shown in the figure, MSGTPL/SI-4001 enclosed. Investigations were
conducted 6.50m from existing ground level where SPT is more than 50blows. SPTs
were conducted at every 1.0m/1.5m depth intervals and samples were collected for
identification and testing.
1.4 LABORATORY TESTS
The laboratory-testing scheme is so designed to obtain the design parameters for the
foundations. The following parameters are evaluated:
Type of soil and it's gradation properties
Specific Gravity
Natural Moisture Content (NMC)
Sieve analysis on the coarse grained soil fraction
All the test results are presented in the tabular forms. Comprehensive field information
along with SPT values is presented on separate sheet.
1.5 SOIL PROFILE
Based on visual identification of soil samples and test results (of both field and
laboratory tests), the soil profile arrived. Subsoil is made-up of four distinctive layers
there are
(i) Very loose to Medium Dense fine SAND up to -1.8m with SPT’s N=2-14
(ii) Very dense Moorum -1.80m to -2.50m with SPT’s N=>50
(iii) Soft Disintegrated Rock -2.5m to -3.5m with SPT’s N=>100
(iv) Fractured Hard Rock -3.50m to -6.50m with core recovery 10%
The soil profile details are presented in the bore-chart.
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Project No: MSGTPL/SI-4001/18-19 APr-2018.
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Proposed Construction of Residential Building (G+2 Upper Floors) at Selaiyur
1.6 GROUND WATER TABLE
At the time of soil investigation (03/04/2018), the ground water table was (-) 2.50m
encountered within the drilled depth.
1.6 DISCUSSION ON FOUNDATION
From the sub soil profile and laboratory test data, it can be seen that the soil is good at
shallow depth onwards up to drilled depth -6.50m from existing ground level.
Based on soil strata it is ideal to adopt open shallow foundation at -1.8m level,
recommended.
1.8 RECOMMENDATIONS
The proposed structure is a G+2 upper floors residential building.
Excavate up to -1.80m, after excavation proper compaction to be done.
Adopt open shallow foundation in the form of isolated/strip raft at a depth of 1.8m below
the G.L
The Safe bearing capacity can be taken of soil at 1.8m below G.L can be taken as
25T/Sq.m.
Foundation should rest on 100mm thick 1:3:6 concrete mat.
Columns shall be tied in both directions at plinth level.
All foundation works should be done in dry conditions only.
Settlements are within permissible limits as per IS-1904-1986.
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Project No: MSGTPL/SI-4001/18-19 APr-2018.
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Proposed Construction of Residential Building (G+2 Upper Floors) at Selaiyur
2.0 DETERMINATION OF BEARING CAPACITY OF SHALLOW FOUNDATIONS [Based On IS: 6403-1981]
Size of Footing (1.5x1.5m) Calculation Purpose
Depth of Foundation: 1.8m
Existing Ground level: 0.00M
Ground Water Table level: -0.00M (Due to Heavy Rain Temporary)
Bulk Density (W) of Soil above Footing Base: 1.80
Submerged Density (W') of Soil above Footing Base: 0.80T/Cu.M.
Bulk Density (W) of Soil Below Footing Base: 1.80T/Cu.M.
Factor of Safety 2.5
Shape factor Depth Factor Inclination Factor Sq = 1.200 Dq = 1.22 Iq = 1.000 Sg = 0.600 Dg = 1.22 Ig = 1.000 Water Table Correction Factor w’ = 0.50
Effective surcharge at base level q = 1.20 T/Sq.M.
Ultimate Net B.C. = Qult_n = q*(Nq-1)*Sq*Dq*Iq + 0.5*B*W*Ng*Sg*Dg*Ig*W'
Angle of Internal Friction (phai): 320
Bearing Capacity Factors Nq = 24.36, Ng = 32.65
Thus Qult_n =65.38 T/Sq.M.
Allowable Bearing Capacity (Qall) =26.15T/Sq.M. Say 25T/m2
Settlement Calculations as per IS-8009-(Part1) 1998
S= Sc+Si Sc≈10mm
=0.01277x1000=12.77mm S= Sc+Si
S=10+12.77=22.77mm Say 23mm Total settlements 22mm, it is less than 25mm hence it is safe as per IS-1904-1986.
IEs
pBSi)1(
2µ−
=
mxSi 0102.031.13500
)3.01(5.132
2
=−
=
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Project No: MSGTPL/SI-4001/18-19
Project: Proposed Construction of Residential Building (G+2 Upper Floors) at Selaiyur
Location Selaiyur
Nil
Rotary Date of Start
Date of Complete
Dia of Bore (mm) 100 Sheet
Termination Depth (m) 6.5m 1 of 1
De
pth
be
low
EG
L (
m)
La
ye
r T
hic
kn
ess
Soil Layers Description
So
il S
ym
bo
l
IS-C
lassific
atio
n
Typ
e F
ield
Te
st
Te
st D
ep
th (
m)
SP
T-
N-
Va
lue
0.0
0.5
1.0 SPT 1.0 3 5 9 14
1.5
2.0 SPT 2.0 17 21 33 54
2.5
3.0 SPT 3.0
Very Dense Brownish
Moorum
50 Blows for 3CmSoft Disintegrated Rock G
P
Drilling
Medium Dense Brownish
Clayey SAND SC
SM
1.0
1.0
1.0
BOREHOLE LOG
Ground R.L (-) 2.5m
3-Apr-2018
SPT Values Record
0 to 45cm
Graphical Representation of SPT
3-Apr-2018
Borehole No BH-1
G.W.T (m)
0 10
20
30
40
50
60
70
80
90
10
0
Graphical Representation of SPT
3.0 SPT 3.0
3.5
4.0 SPT 4.0 - - - >100
4.5
5.0 SPT 5.0
5.5
6.0
6.5 SPT 6.5
7.0
7.5
8.0
8.5
9.0
9.5
10.0
10.5
11.0
11.5
12.0
12.5
13.0
13.5
14.0
14.5
15.0
EGL- Existing Ground Level SPT- DS-
R.L- Reduced Level UDS- CR-
Ground Water Table VST- RQD- Rock Quality Designation
CR=10%
50 Blows for 3Cm
CR=5%
Ve
ry P
oo
r
Fractured Hard Rock
Borehole Termination Depth (m) 6.5m
GWT-
Disturbed SampleStandard Penetration Test
Undisturbed Sample
Vane Shear Test
Core Recovery
3.5
6
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Project No: MSGTPL/SI-4001/18-19
Project: Proposed Construction of Residential Building (G+2 Upper Floors) at Selaiyur
Location Selaiyur
Nil
Rotary Date of Start
Date of Complete
Dia of Bore (mm) 100 Sheet
Termination Depth (m) 6.5m 1 of 1
De
pth
be
low
EG
L (
m)
La
ye
r T
hic
kn
ess
Soil Layers Description
So
il S
ym
bo
l
IS-C
lassific
atio
n
Typ
e F
ield
Te
st
Te
st D
ep
th (
m)
SP
T-
N-
Va
lue
0.0
0.5
1.0 SPT 1.0 1 1 1 2
1.5
2.0 SPT 2.0 9 22
2.5
3.0 SPT 3.0
50 Blows for 9Cm
GP
SM
Soft Disintegrated Rock
Very Dense Brownish
Moorum
1.0
1.0
1.0Very Loose Brownish Silty
Fine SAND SM
50 Blows for 0Cm
Drilling 3-Apr-2018
3-Apr-2018
SPT Values Record
0 to 45cm
Graphical Representation of SPT
Ground R.L G.W.T (m) (-) 2.5m
BOREHOLE LOG
Borehole No BH-2
0 10
20
30
40
50
60
70
80
90
10
0
Graphical Representation of SPT
3.0 SPT 3.0
3.5
4.0 SPT 4.0 - - - >100
4.5
5.0 SPT 5.0 - - - >100
5.5
6.0
6.5 SPT 6.5 - - - >100
7.0
7.5
8.0
8.5
9.0
9.5
10.0
10.5
11.0
11.5
12.0
12.5
13.0
13.5
14.0
14.5
15.0
EGL- Existing Ground Level SPT- DS-
R.L- Reduced Level UDS- CR-
Ground Water Table VST- RQD- Rock Quality DesignationGWT- Vane Shear Test
Borehole Termination Depth (m)
Ve
ry P
oo
r
3.5
6.5m
Standard Penetration Test Disturbed Sample
Undisturbed Sample Core Recovery
50 Blows for 0Cm
Fractured Hard Rock
7
FINAL COPY5.0 TEST RESULTS
Project No: MSGTPL/SI-4001/18-19
NM
C
WL
WP
I P Ic
Fre
eS
well
Gra
vel
Co
ars
e S
an
d
Med
ium
San
d
Fin
e S
an
d
Sil
t &
Cla
y
0.00
14 1.00 15 2.63 3 5 31 25 36
54 2.00 11 2.61 11 6 23 36 24
>100 3.00
>100 4.00
Rock 5.00
Rock 6.50
Very
poor
3.50 Fractured Hard Rock
Very Dense Brownish Moorum1.00
Soft Disintegrated Rock GP1.00
Grain Size Analysis (%)Index Properties (%)
Project : Proposed Construction of Residential Building (G+2 Upper Floors) at Selaiyur
BH No 1
SUMMARY OF TEST RESULTS
6.5mTermination Depth: Ground Water Level:(-)2.50m
N' V
alu
e
Layer
Th
ickn
ess
Dep
th (
m)
So
il D
escri
pti
on
IS C
lassif
icati
on
SCMedium Dense Brownish Clayey
SAND1.00
SM
Sp
ecif
ic G
ravit
y
8
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Project No: MSGTPL/SI-4001/18-19
NM
C
WL
WP
I P Ic
Fre
eS
well
Gra
vel
Co
ars
e S
an
d
Med
ium
San
d
Fin
e S
an
d
Sil
t &
Cla
y
0.00
2 1.00 14 2.61 5 2 23 38 32
>100 2.00 12 2.63 9 6 29 30 25
>100 3.00
Rock 4.00
Rock 5.00
Rock 6.50
Very
Poor
3.50 Fractured Hard Rock
1.00Very Loose Brownish Silty Fine
SAND SM
SMVery Dense Brownish Moorum1.00
1.00 GPSoft Disintegrated Rock
SUMMARY OF TEST RESULTS
N' V
alu
e
Layer
Th
ickn
ess
Dep
th (
m)
So
il D
escri
pti
on
IS C
lassif
icati
on Index Properties (%)
Sp
ecif
ic G
ravit
y
Grain Size Analysis (%)
Project : Proposed Construction of Residential Building (G+2 Upper Floors) at Selaiyur
BH No 2 Ground Water Level:(-)2.50m Termination Depth: 6.5m
9
FINAL COPY6.0 NATURAL MOISTURE CONTENT
Project No: MSGTPL/SI-4001/18-19
Project : Proposed Construction of Residential Building (G+2 Upper Floors) at Selaiyur
Method: IS-2720 P-2
BH.No/ Pit no
Depth (m)
Tare No 113 136 143 104 244 209 23 169
Wt of Tare (gr) 29.49 29.56 29.53 29.86 29.97 29.26 31.06 30.87
Tare + Soil (gr) 49.79 65.96 66.71 55.11 57.42 61.80 60.56 60.50
Tare+Dry soil (gr) 47.15 61.16 63.12 52.65 54.12 57.78 57.42 57.29
Wt of Water (gr) 2.64 4.80 3.59 2.46 3.30 4.02 3.14 3.21
Wt Dry soil (gr) 17.66 31.60 33.59 22.79 24.15 28.52 26.36 26.42
Water Content (%) 14.95 15.19 10.69 10.79 13.66 14.10 11.91 12.15
Average Water
Content (%)
Natural Moisture Content Data Sheet
1.0
1 1 2 2
15 11 14
1.02.0
12
2.0
11
FINAL COPY7.0 SPECIFIC GRAVITY
Project No: MSGTPL/SI-4001/18-19
BH.No 1 BH.No 1
Depth(m) 1.0 Depth(m) 2.0
Pycnometer number 18 82 Pycnometer number 9 61
Weight of bottle w1 g 35.9000 33.2900 Weight of bottle w1 g 34.0800 34.5400
Weight of bottle + soil w2 g 46.7400 47.1600 Weight of bottle + soil w2 g 49.1000 49.5600
Weight of bottle + soil + water w3 g 95.1200 94.8200 Weight of bottle + soil + water w3 g 96.3100 95.4600
Weight of bottle full of water w4 g 88.4000 86.2200 Weight of bottle full of water w4 g 87.0400 86.1900
w2-w1 g 10.8400 13.8700 w2-w1 g 15.0200 15.0200
w2-w1
(w4-w1)-(w3-w2)2.63107 2.63188
w2-w1
(w4-w1)-(w3-w2)2.61217 2.61217
2.63 2.61
SPECIFIC GRAVITY TEST
Project : Proposed Construction of Residential Building (G+2 Upper Floors) at Selaiyur
Specific gravity
Weight of soil
Average value Gs Average value Gs
Weight of soil
Specific gravity
12
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Project No: MSGTPL/SI-4001/18-19
BH.No 2 BH.No 2
Depth(m) 1.0 Depth(m) 2.0
Pycnometer number 60 62 Pycnometer number 63 2
Weight of bottle w1 g 33.9700 34.2000 Weight of bottle w1 g 33.0400 35.9800
Weight of bottle + soil w2 g 50.4600 53.9900 Weight of bottle + soil w2 g 48.5100 50.7500
Weight of bottle + soil + water w3 g 96.4200 98.5300 Weight of bottle + soil + water w3 g 95.0400 96.6400
Weight of bottle full of water w4 g 86.2500 86.3400 Weight of bottle full of water w4 g 85.4500 87.4800
w2-w1 g 16.4900 19.7900 w2-w1 g 15.4700 14.7700
w2-w1
(w4-w1)-(w3-w2)2.60918 2.60395
w2-w1
(w4-w1)-(w3-w2)2.63095 2.63280
2.61 2.63Average value Gs Average value Gs
SPECIFIC GRAVITY TEST
Project : Proposed Construction of Residential Building (G+2 Upper Floors) at Selaiyur
Weight of soil Weight of soil
Specific gravity Specific gravity
13
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8.0 GRAIN SIZE ANALYSIS
GRAIN SIZE ANALYSIS
Project : Proposed Construction of Residential Building (G+2 Upper Floors) at Selaiyur
Project No: MSGTPL/SI-4001/18-19
SILT
4.7520.4250.0750.0020
10
20
30
40
50
60
70
80
90
100
0.001 0.01 0.1 1
Pe
rce
nta
ge
Fin
er
(%)
Particle Size (mm)
BH 1 Depth 1.0m
BH 1 Depth 2.0m
SANDSAND
CLAY SILT
FINE MEDIUM COARSE
Depth Gravel
(m) (%) Coarse Medium Fine
1 1.0m 3 5 31 25 0.000 0.156
1 2.0m 11 6 23 36 0.156 0.449
2 1.0m 5 2 23 38 0.156 -0.056 -0.4
2 2.0m 9 6 29 30 0.449 0.150 0.682 1.5 0.1
SAND (%)BH-No
25
32
24
36
SILT& CLAY
(%)
D60
(mm)
D30
(mm)
D10
(mm)CcCu
4.7520.4250.0750.0020
10
20
30
40
50
60
70
80
90
100
0.001 0.01 0.1 1
Pe
rce
nta
ge
Fin
er
(%)
Particle Size (mm)
2 Depth 1.0m
BH 2 Depth 2.0m
SAND
FINE MEDIUMCLAY
COARSESILT
14