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Certificationof

Reinforced Fill Products Ir K C Lam

Chief Geotechnical Engineer/Geotechnical Projects

GEO, CEDD

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Outline of Presentation

1. Examples of Reinforced Fill Structures

and Slopes

2. Key Components of Reinforced FillStructures and Slopes

3. Certification System for Reinforced Fill

Products

4. Other GEO Certification System

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Examples of Reinforced Fill

Structures and Slopes

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Concrete Panel Wall at North West Tsing Yi

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Concrete Block Wall at Discovery Bay

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Airport Express Lantau Tunnel, West Portal

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Tsing Yi North Costal Road

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Castle Peak Road, Ting Kau

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Castle Peak Road, Ting Kau

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Yuen Long Highway

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Route 3, Yuen Long

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Shenzhen River Regulation

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Kau Sai Chau Golf Course, Sai Kung

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Key Components of Reinforced Fill

Structures and Slopes

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Concrete Block Wall

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Concrete Panel Wall

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Reinforced Fill Slope

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Common Reinforcing Products

Metallic Reinforcement

Polymeric Reinforcement

High Density Polyethylene (HDPE)

Polyester (PET)

Polyaramid

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Common Form of Polymeric Reinforcement

Ribbed polyolefincasing

Polyester orpolyaramid bands

Woven or knitted polyestergrid or grid formed by welding/knitting individual strips/bars

Drawn polymer sheet containing holes

Strips/bars

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Strip Reinforcement

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Grid Reinforcement

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Characteristics of Polymeric Materials

Strength and stress/strain characteristic of polymeric reinforcement are

(1) function of the constituent materials and the geometric arrangement of the

elements; and

(2) temperature and time dependant

Stress/Strain Characteristics of

Different Polymeric Materials

Effects of Geometrical Structure on Stress/

Strain Characteristics of Polyester Fibres

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Creeping of Polymeric Materials

Stress-rupture Behaviour of Different Forms of

Polymeric Reinforcement

Creep Curves of Polyester Strip Reinforcement

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Creeping of Polymeric Materials

Creep Coefficients Versus Percentage Applied

Load for Various Polymeric Reinforcing Materials

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Certification System for Reinforced

Fill Products

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Environment, Transport & Works Bureau Technical Circular

(Works) No. 24/2003

Permanent Reinforced Fill Structures and Slopes

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Works Policy as Stipulated in ETWB TCW No. 24/2003

1. The long-term strength and stress-strain

characteristics of many reinforcing products (e.g.

polymeric reinforcing products) are temperature

and time dependent. These products arerequired to be certified by the Civil Engineering

and Development Department before they are

used in permanent reinforced fill structures and

slopes in Government projects.

2. Metallic reinforcing products do not require

certification.

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Design Guidance - GEOGUIDE 6

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Administration of the Certification System

Authority certificate to be issued by DCED Policy Controller DH(I)

Operation control CGE/GP with technical

support from Reinforced Fill Advisory Panel(also external specialist consultant)

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Assessment of Applications

Durability, hydrolysis, creep and stress

rupture

Long-term design strengths and fill-to-reinforcement interaction

Potential for construction damage

Quality assurance

Further requirements for compliance

testing

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Tests for Durability

Polyester- immersion of specimens in

hot sodium hydroxide solution of pH = 9

or greater.

Polyethylene oven ageing and UV

radiation exposure of 40 MJ/m

2

.

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Tests for Creep and Stress Rupture

Perform creep tests on specimens at

elevated temperature (e.g. 30C) until

rupture or otherwise for a period rangingfrom at least 1,000 hrs to more than

10,000 hrs.

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Tests for Construction Damage

Perform site damage test by subjectingthe test specimens to the environmentaland construction conditions of thereinforced fill feature.

Measure the influence on thecharacteristic strength of the test

specimens by recovering them from testsites and comparing them with the virginspecimens.

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Tests for Fill-to-Reinforcement

Interaction

Shear and pullout tests to be

performed with soils of similar

particle size distribution to theTypes I and II fill as defined in

Geoguide 6

C tifi t i d b DCED

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Certificate issued by DCED

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Contents of Individual Product Certificates

Product Information

Design tensile strength and partial material

factor on tensile strength

Design coefficient of fill-to-reinforcement

interaction

- direct sliding coefficient

- pullout coefficient Requirements for compliance testing

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Other GEO Certification System- Anchor Certification System

-

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Certificate Issued by CEDD

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Details of a Certified Ground Anchor

(PVC sheath and cement grout as corrosion protection barriers)

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Merits of Certification System

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Thank You