deep ground improvement by controlled modulus …...2020/01/04 · deep ground improvement by...

Deep Ground Improvement by Controlled Modulus

Columns (CMC) and Prefabricated Vertical Drains (PVD)

Future Fuel Terminal

Tuxpan, Veracruz, México

1

TC211 Workshop

Cancún 2019

www.menard.com.mx / www.menard-group.com(52) 55 5241 1108 / [email protected]

http://www.menard-group.com/


Contents

01 Project

02 Design

03 Execution

04 QA/QC

Project

01




4 www.menard.com.mx / www.menard-group.com

Deep Ground Improvement by CMC and PVD



Scope:

➢ Landfill of 3m thick (113,000m2), distributed load 50 kPa

➢ Foundation of 11 tanks, diameter 43m, applying 202 kPa on the ground


Deep Ground Improvement by CMC and PVDNormalized plots

Min. elevation: -34.34 m

SOIL ANALYSIS FROM CPT

-34.4

-32.4

-30.4

-28.4

-26.4

-24.4

-22.4

-20.4

-18.4

-16.4

-14.4

-12.4

-10.4

-8.4

-6.4

-4.4

-2.4

-0.4

+1.6

+3.6

0 4 8 12

Ele

vati

on

(m

RL

)

Cone resistance qt (MPa)

-34.4

-32.4

-30.4

-28.4

-26.4

-24.4

-22.4

-20.4

-18.4

-16.4

-14.4

-12.4

-10.4

-8.4

-6.4

-4.4

-2.4

-0.4

+1.6

+3.6

0 2 4 6 8

Ele

vati

on

(m

RL

)

Friction ratio Rf (%)

GWT

-34.4

-32.4

-30.4

-28.4

-26.4

-24.4

-22.4

-20.4

-18.4

-16.4

-14.4

-12.4

-10.4

-8.4

-6.4

-4.4

-2.4

-0.4

+1.6

+3.6

-300 0 300 600 900 1200

Ele

vati

on

(m

RL

)

Pore pressures u0, u2 (kPa)

u0 u2

-34.4

-32.4

-30.4

-28.4

-26.4

-24.4

-22.4

-20.4

-18.4

-16.4

-14.4

-12.4

-10.4

-8.4

-6.4

-4.4

-2.4

-0.4

+1.6

+3.6

1 2 3 4

Ele

vati

on

(m

RL

)

SBTn index Ic

0 1 2 3 4 5 6 7 8 9+3.98

+1.98

-0.02

-2.02

-4.02

-6.02

-8.02

-10.02

-12.02

-14.02

-16.02

-18.02

-20.02

-22.02

-24.02

-26.02

-28.02

-30.02

-32.02

-34.02

Normalized Soil Behaviour Type SBTn

Ele

vati

on

(m

RL

)



Scope of work

• Landfill of 3m thick (113,000m2), distributed load 50 kPa

✓ Settlements (medium and long term)

➢ Prefabricated Vertical Drains and Preload

• Foundation of 11 tanks, diameter 43m, applying 202 kPa on the ground

✓ Total and differential settlements

✓ Bearing capacity

➢ Controlled Modulus Columns (CMC)

/ geotechnical challenges / ground improvement solution:

Design

02






Design basis:

- Controlled Modulus Columns (CMC)

- Diameter 400 mm

- Distance 2.0 to 2.5 m

- Depth from 35 to 38 m

- Prefabricated Vertical Drains (PVD)

- Prefabricated Material

- Distance about 2.0 m


Below the tanks



Design basis:

- Controlled Modulus Columns (CMC)

- Diameter 400 mm

- Distance 2.0 to 2.5 m


- Prefabricated Vertical Drains (PVD)

- Prefabricated Material

- Distance about 2.0 m


Below the tanks + preloaded areas



Determination of loading time Value Unit

Loading time t 4.00 month

undrained consolidation Uv 26.25 %

drained consolidation U 90.95 %

Soil parameters Value Unit

Vertical consolidation coefficient Cv 1.3E-07 m²/s

Radial consolidation coefficient Cr 3.9E-07 m²/s

Drained sides (1 ou 2) 2

Drained thickness h 10.00 m

Vertical Drains parameters Value Unit

Mesh L 2.0 m

Triangular (1,05); Squared (1,13) 1.13

Drains diameter d 0.05 m

Execution

03






CMC + PVD combined solution



Constructive details for

treatment below the ringwall



CMC equipments



PVD equipment

QA / QC

04






Real time monitoring system



➢ Hydraulic pressure

➢ Concrete pressure

➢ Pull-down

➢ Torque

➢ Penetration speed

➢ Extraction speed

➢ CMC’s profile



Load-bearing

control test



Load-bearing control test



Concrete slump

test

Compressive

strength tests



Piezometers

¡GRACIAS!




deep ground improvement by controlled modulus …...2020/01/04 · deep ground improvement by...

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