Project Site Description Area – 2,30,327 m 2 Global Position – Between N 19 0 02’20” to N19...

Project Site Description

• Area – 2,30,327 m2

• Global Position – Between N 19002’20” to N19002’71” and E 72089’50” to E72090’80”

• Elevation – +14.5m to +71m m.s.l.

• Rainfall – 2211 mm annual

• Temperature – Min. 15.5 0C Dec.; Max. 350C May

• Nearest Rly. Stn. – Kurla, 10 km

Project Site Description

LEGEND:

- Ground Level +50m.a.m.s.l.

- Ground Level +17m.a.m.s.l.

N

Geological Investigations and results

Regional Geology


Testing at site


Testing at site

Hole No. Total no. of Joints observedJoints as per inclination

Spacing. of Joints (m)

<50o >70o

BH-1 53 33 20 0.80

BH-2 91 78 13 1.20

BH-3 49 44 5 0.65

BH-4 30 30 NIL 0.40

BH-5 56 39 17 1.23

BH-6 97 74 23 0.77

BH-7 65 55 10 0.54

BH-8 123 63 60 1.00


Testing at site


Testing at site

1- Soil/Weathered rock2- Weathered/jointed rock3- Sparsely jointed/massive rock


Testing at site - Result

Geo-mechanical Investigations and results

In-situ Stress Regime (i) High stress Zone ‘1’ (Depth from surface 30-35m)

v = 0.028*depth, MPa ≈ 1.0 MPa, Dipping vertically downward

H = 4.8 MPa, Strike direction N1230E±300

h = 2.2 MPa, Strike direction N2130E±300

(ii) High stress zone ‘2’ (Depth from surface 50-60m)

v = 0.028*depth, MPa ≈ 1.7 MPa, Dipping vertically downward

H = 18.7 MPa, Strike direction N720E±300

h = 9.7 MPa, Strike direction N1520E±300

(iii) General stress profile

v = 0.028*depth, MPa Dipping vertically downward

H = 0.11*depth, MPa, Strike direction N1260E±300

h = (0.024*depth + 1.08) MPa, Strike direction N2160E±300


In-situ Stress Regime


Physico-mechanical properties

Basic physico-mechanical parameters

Samples borehole numbers

Samples depth range from surface

Parameters value range

Mean value of the parameters

Remarks

Density, , kg/m3 B1, B2, BH3, BH4

5.5m to 54.5m 2.67 to 2.85 2.78 kg/m3

Young’s modulus (static), E, GPa

BH1, BH2, BH3, BH8

25.5m to 65.5m 5.7 to 15.5 8.65 GPa Higher values below -30m m.s.l.

Poisson’s ratio (static),

BH1, BH2, BH3, BH8

25.5m to 65.5m 0.19 to 0.25 0.23

Young’s modulus (Dyn.), Edyn, GPa

BH1 around 47m 53 to 63 56.8 GPa

Poisson’s ratio, (Dyn.), dyn

BH1 around 47m 0.25 to 0.28 0.27

Uniaxial Comp. Strength, UCS, MPa

BH1, BH2, BH3, BH8

28.2m to 65.5m 17.7 to 87.7 45.1 MPa Higher values below -30m m.s.l.

P-Wave velocity, Vp,

km/sec.

BH1 around 47m 4.58 to 5.28 5.01 km/sec.

S-Wave velocity, Vs,

km/sec.

BH1 around 47m 2.70 to 2.93 2.8 km/sec.

Fracture toughness, KIC, MPa/m0.5

BH1 around 47m 1.96 to 2.26 2.06 MPa/m0.5


Rock Mass Characterization Parameter Parameter values Parameter

ratingsRemark

Strength, intact rock

17.7-87.7 MPa 4-7 Rock strength greater than 75 MPa below -30m m.s.l. will result into rating near to 6.

RQD 79-100 17-20 Based on volumetric joint count, RQD surrounding caverns level expected at 95% and will result in the rating of 20.

Spacing, discont. 0.35m to 2.5m 10-20 Expected joint spacing at the proposed caverns level is 0.6m to 2.0m resulting into the rating of 15.

Condition of discontinuities

Joint aperture less than 1mm to tight joints with rough, planar walls with no infillings.

25-30 Based on core drilling and permeability measurements.

Ground water Damp to completely dry 10-15 Based on core drilling and geo-hydrological studies at Calico site. Complete dry rock mass conditions expected for surrounding the caverns housing resulting into the rating of 15.

Adjustment for joint orientation w.r.t. drivage direction.

Fair to very favourable (-5)- 0

Adjusted RMR 61-92 “Good”- “Very good” rock mass conditions. Average RMR of 86 (very good rock mass conditions) is expected to surround the proposed caverns level.


Rock Mass Characterization

Parameter value remark

RQD 100-79 Good to excellent quality cores

Jn 1-12 Massive to three joints sets + random

Jr 1.5-3 Rough or irregular, planar to irregular, undulating joint sets

Ja 0.75-1 Unaltered joint walls, surface staining only to tightly healed joint walls.

Jw 1 Dry

SRF 1 Medium stress

Q 10-300 “Good”- “Ext. Good"


Prediction of Ground Conditions

Immediate Collapse

ROCK MASS R

ATING

20

30

40

50

60

7080

90 10 yr1 yr1 mo1 wk1 dR

oo

f S

pan

,m

2

3

456

8

10

20

30

1

10-1 100 101 102 103 104 106 108

Stand-up Time, hrs

ROCK MASS RATING

No Support Required

20

30

40

5060

70 80

90

Avg. RMR=86

for Calico Plot


Prediction of Ground Conditions

Geo-hydrological Investigations and results

Permeability

test-no. MD L dV/dP Phyd Perm., K kf

m m m3/Pa MPa darcy m/s

8 15.0 0.7 1.97 · 10-11 0.16 2.7 2.7 · 10-11

7 25.0 1.94 · 10-11 0.26 24.9 2.5 · 10-10

6 35.0 2.99 · 10-11 0.35 517.4 5.2 · 10-9

5 40.0 low pressure build-up

4 45.0 6.18 · 10-11 0.45 75.9 7.6 · 10-10

3 51.0 2.03 · 10-11 0.51 18.2 1.8 · 10-10

2 58.0 2.26 · 10-11 0.59 2.9 2.9 · 10-11

1 60.0 2.64 · 10-11 0.62 53.2 5.3 · 10-10


Aquifer


Ground water flow


Geo-hydrology results

Conclusions of the Study

• Calico Plot is an ideal site for crude oil storage at caverns top at -55m m.s.l. Finished products can also be stored in the underground.

• Caverns of 24m width and 24m to 40m height can safely be constructed at the site.

• The site offers for a simple water curtain system operative from the surface to enhance hydraulic containment.

• Caverns at Calico will pioneer the refinery business in India for sustainable growth under constraints of congested urban sprawl.

Project Site Description Area – 2,30,327 m 2 Global Position – Between N 19 0 02’20” to N19...

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