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Nam O ResortDa Nang, Vietnam Bund Wall Conceptual Design 17 October 2017... Unit Weight, kN/m 3 Condition f  c‘ kPa Su kPa Above GWL Below GWL The soil parameters adopted for the conce

Nam O Resort

Da Nang, Vietnam

Bund Wall Conceptual Design

17 October 2017

0+110

0+360

0+210

Location Plan

Location of Chainage

0+510

Site Boundary

Site Investigation Plan

BH17

BH14

BH16

BH15

BH11 BH10 BH9 BH8BH7

BH6

BH3 BH2 BH1

Source: “BH Layout - Phase 1 - R03 (170905).pdf” attached in TTG’s email on 29 Sep 2017

Geological Section at Site Boundary along Cu De River

Source: “170929_R02-Nam O_Bored Hole Log Model (1).dwg” attached in TTG’s email on 29 Sep 2017

Level

(Assumed

mND)

+2.00

-8.00

-18.00

-28.00

-38.00

-0.50

-3.00

-5.50

-10.50

-13.00

-15.50

-20.50

-23.00

-25.50

-30.50

-33.00

-35.50

Medium dense,

dense SAND

Soft CLAY

Firm CLAY

Dense

GRAVEL Clayey SAND

(weathered)

Weathered

SILTSTONE

MSL = +0.0

1

4

5 6

8

9 3

-Summary of Boreholes

-Clayey SAND

(weathered)

4

5

6

7

8

Soft CLAY

- Low SPT N-Value (3 to 9)

- Low strength ►Bund Stability Issue

- Compressible ► Settlement

- Much thicker at BH14 and BH17 (12m thk)

- Medium-dense SAND

-45

-40

-35

-30

-25

-20

-15

-10

-5

0

5

SPT N-Value

BH15 BH16 BH14 BH17

Geotechnical Interpretation

Loose

Representative Line

Mean SPT-N = 20 Angle of friction = 33

(Ref CIRIA R143 Fig 36)

-40

-35

-30

-25

-20

-15

-10

-5

0

5

SPT N-Value

BH15 BH16 BH14 BH17

Geotechnical Interpretation

Firm

Representative Line

Mean SPT-N = 6 Undrained Shear Strength

Su = 27kPa (Su = 4.5×N)

(Ref CIRIA R143 Fig 31)

Soft CLAY

4

Soft

V.Soft

-40

-35

-30

-25

-20

-15

-10

-5

0

5

SPT N-Value

BH15 BH16 BH14 BH17

Geotechnical Interpretation

Firm

Firm CLAY

5

Soft

V.Soft

Representative Line

Mean SPT-N = 12 Undrained Shear Strength

Su = 54kPa (Su = 4.5×N)

(Ref CIRIA R143 Fig 31)

Dense GRAVEL

-45

-40

-35

-30

-25

-20

-15

-10

-5

0

5

SPT N-Value

BH15 BH16 BH14 BH17

Geotechnical Interpretation

Loose

Representative Line

SPT-N = 100 (majority) Angle of friction = 42

(Ref CIRIA R143 Fig 36)

6

Geotechnical Interpretation

-45

-40

-35

-30

-25

-20

-15

-10

-5

0

5

SPT N-Value

BH15

BH16

Loose

Medium Dense SAND

7

Representative Line

Mean SPT-N = 22 Angle of friction = 34

(Ref CIRIA R143 Fig 36)

-40

-35

-30

-25

-20

-15

-10

-5

0

5

SPT N-Value

BH15 BH16 BH14 BH17

Geotechnical Interpretation

Loose

Representative Line

SPT-N = 75 to 100 Angle of friction = 42

(Ref CIRIA R143 Fig 36)

Clayey SAND (weathered)

8

Unit Weight, kN/m 3

Condition f

( )

c‘

(kPa)

Su (kPa)

Above GWL

Below GWL

The soil parameters adopted for the conceptual design are based on the information presented in borehole logs BH14 to BH17 along Cu De River The parameters are

assumed based on the descriptions of the soil strata only, and will need to be further reviewed when laboratory testing is completed.

Note 1 Undrained shear strength of Deep Cement Mixing is estimated based on 50%

replacement ratio, and Uniaxial Compressive Strength of DCM columns of 1MPa

Soil Parameters

4 5 6 7 8

Topography

Existing Ground Profile

(Section A-A)

Firm CLAY

Medium dense SAND

Soft CLAY

Dense GRAVEL

Mean Sea Level (0mND)

Clayey SAND

1

4

5 6 8

3

+5

0

-5

-10

-15

-20

-25

-30

Level

(mND)

-35

-40

BH14

Site Boundary

Existing Ground Profile

(Section A-A)

Firm CLAY

Medium dense SAND

Soft CLAY

Dense GRAVEL Clayey SAND

1

4

5 6 8

3

+5

0

-5

-10

-15

-20

-25

-30

Level

(mND)

-35

-40

BH14

Site Boundary

The ground is underlain by

very thick soft clay, which

may affect river bank

stability.

Fill to +3mND

1

Mean Sea Level

(0mND)

Existing Ground Profile

(Section A-A)

Firm CLAY

Medium dense SAND

Soft CLAY

Dense GRAVEL

Mean Sea Level

(0mND)

Clayey SAND

1

4

5 6 8

3

+5

0

-5

-10

-15

-20

-25

-30

Level

(mND)

-35

-40

BH14

Site Boundary

Fill to +3mND

The sandy river

bank may erode

due to river flow and wave

2

MLLW (-0.4mND)

Bund Wall Option

Rockfill Bund on Deep Cement Mixing Foundation

Firm CLAY

Medium dense SAND

Soft CLAY

Dense GRAVEL

Mean Sea Level

(0mND)

Clayey SAND

1

4

5 6 8

3

+5

0

-5

-10

-15

-20

-25

-30

Level

(mND)

-35

-40

BH14

Site Boundary

Fill to +3mND

The sandy river

bank may erode

due to river flow and wave

MLLW (-0.4mND)

DCM (10m wide;

35% plan replacement)

Rockfill Bund (2m wide top;

1v:2h gradient Bund

Wall Top (+4mND)