Case Studies

USE OF TECHGRID GEOGRID FOR 45M REINFORCED SOIL SLOPE, SHILLONG

M/s Best Geotechnics Pvt. Ltd
SHILLONG

There is a construction of a Reinforced Soil Slope at Shillong bypass (Meghalaya) connecting NH-40 and NH-44 with the application of geosynthetics in that region which has natural mountain terrain, deep valley at rare end side, with touch of natural green aesthetic and state of the art design & architecture.

The reinforced soil slope & gabion retaining wall at toe has been proposed to slope elevated terrain in concurrence to design, consultant & architect. Their joint views have taken into many revisions before arriving at practicable solution which encircles the aesthetic view with as a final outcome at rare deep valley portion, based on the submission of M/s Best Geotechnics. Keeping the above perspective, the scope work of Techfab India Industries Ltd., was to meet:

• Supply of Techgrid Geogrids, Metal Gabion, Nonwoven Geo textile. • Supervision.

Wrap-around Geogrid facing for Reinforced Soil Slope, with Geotextile bags filled with sand. Techfab Metal Gabion as toe wall.

Introduction

Over- excavated area the sub grade shall be in maximum loose lifts of 250mm & shall be
compacted to a minimum of 95% Standard Proctor Dry Density with 1% to 2% of OMC in
accordance with relevant standard.

Engineer In Charge inspect for the sub grade soil properties for the reinforced zone should
fulfil the requirements according to design & drawings.

Problem Description

Excavation:
a) Excavate the sub grade vertically to the plan elevation & horizontally to the extent of the
geogrid lengths.
b) Remove & replace the unnecessary soil not meeting the requirement given by the design
engineer with the approved materials from owner’s side.
c) Protect excavated materials that can be used as a backfill for the reinforcement zone against
weather.

Solution Proposed

Foundation Preparation:
a) Over- excavated area the sub grade shall be in maximum loose lifts of 250mm & shall be
compacted to a minimum of 95% Standard Proctor Dry Density with 1% to 2% of OMC in
accordance with relevant standard.
b) Engineer In Charge inspect for the sub grade soil properties for the reinforced zone should
fulfil the requirements according to design & drawings.

Construction:
a) Construct reinforced soil slope in accordance with the approved design & drawings.
b) All precautions are to be taken while placing the geogrids to avoid damages.
c) Reinforced soil & backfill must fulfil the requirements according to the approved design &
drawings

Execution On Site

The supplied materials, Techgrid - Geogrid, Nonwoven Geotextile, and PVC coated galvanised
Gabion are the in house manufactured products of Techfab India Ltd., in their state of the ISO
9001:2008 certified factory under the proven and tested qualified experienced faculties having edge of
national globally accredited QTP & QTC.

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