s05220000120104002topic 5 (session 8) geonet and geopipe

7/28/2019 S05220000120104002Topic 5 (Session 8) Geonet and Geopipe

1/19

GEONETS & GEOPIPESSession 8

Course : S0522 - Geosynthetic Application in Civil Engineering

Year : 2010


2/19

Bina Nusantara

GENERAL

SCOPE OF THE COURSEDefinition and FunctionsProperties and test methodsApplicationsDesigning CriteriaConstruction methods and techniques


3/19

Bina Nusantara

DEFINITION & TYPES

A geonet is stiff polymer net-like sheets with in-plane

openings used primarily as a drainage material within

landfills or in soil and rock masses, formed by continuous

extrusion of parallel sets of polymeric ribs at acute anglesto one another. When the ribs are opened, relatively large

apertures are formed into a netlike configuration.

Geopipe is perforated or solid wall polymeric pipes used

for the drainage of various liquids. Made from HDPE, PP or

PVC.


4/19

Process of Production

GEONETS


5/19

Geonet types

GEONETS


6/19

Geonet types

GEONETS


7/19

Bina Nusantara

Polymer Types : HDPE, PP & PVC

Types : Perforation and Corrugated

Size : Variation (starting from 1 to 2 m)

Function : Drainage medium

GEOPIPES


8/19

GEONET PROPERTIES

Physical Properties Density Thickness Mass per unit area Mesh size

Mechanical Properties Tensile Strength Compressive Strength

Hydraulic Properties Flow rate capacity against certain pressure and gradient hydraulic

Endurance Properties Installation damage Creep behaviour

Degradation Properties Against temperature Against chemical substance

Against micro organism


9/19

GEONET APPLICATIONSDRAINAGE SYSTEM

AT LANDFILL AREA

CAPPING

DRAINAGE

DRAINAGE UNDERNEATH

LANDFILL


10/19

GEONET APPLICATIONS

Roof

garden


11/19

GEONET APPLICATIONS


12/19

GEOPIPE APPLICATIONS

Drainage Medium at Sport

Field


13/19

GEOPIPE APPLICATION

Drainage Medium at

Road construction


14/19

DESIGN CRITERIA

Bina Nusantara


15/19

Bina Nusantara

DESIGN CRITERIA


16/19

Bina Nusantara

DESIGN CRITERIA


17/19

Installation Procedures of Geonet:

1. After the geomembrane/ substratum has been installed/ constructed, tested andapproved by the Engineer, the surface shall be clean and free of excess dirt and debris.

2. The geonet roll should be installed down the slope, and precautions taken to minimizewrinkles. The tri-planar geocomposite directs flow predominately in the machinedirection (along the roll length) and thus should be installed in the intended direction offlow. This is generally directly down slope unless the Engineer specifies an alternativedrainage path.

3. In the presence of wind, all geonet materials shall be weighted with sandbags or theequivalent. Such sandbags shall be installed during placement and shall remain untilreplaced with specified overlying material.

4. If there are any obstructions (such as outlet pipes or monitoring wells) while deployingthe geonet, the geonet shall be cut to fit around the obstruction. Care should be taken

as to make sure there is no gap

GEONET INSTALLATION


18/19

GEONET INSTALLATION

Seams and overlaps

The geonet and each component of the geocomposite (geonet & geotextile(s)) will be secured

or seamed to the like component at overlaps.

Overlap Along Roll Length


19/19

GEONET INSTALLATION

Overlap Along Roll Width (CD)

s05220000120104002topic 5 (session 8) geonet and geopipe

Documents