SH7 WAIAU FERRYU BLUFFS

Slope stabilisation and rockfall protection along the highway to Canterbury's resort destination, Hanmer Springs.

Project Overview

 

An already fragile slope above the SH7b, the road only access into the resort town of Hanmer Springs, was further affected from the 2016 7.8 magnitude Kaikoura Earthquake and resultant aftershocks with frequent low energy rockfall and debris onto the state highway.

Initially the entire slope which was around 300m long and up to 40m high was designed to be covered with a low energy mesh drape to contain the small debris and rockfall to the road edge which would have been quick and easy to construct.

 

Geovert Solution

 

After commencing we found further tension cracks and localized movements to the slope to the North of the existing area that required stabilisation. Rockfall sources were also found to be coming from further up the slope and bouncing, so the design changed to include a 100m long rockfall attenuator through the middle section with the additional slip area treated with 700m2 of actively stabilised G65/3mm TECCO mesh anchored with 30/11 into broken ground with grout flush.

 

To construct the concrete plinths high up the slope for the attenuator a significant amount of tree felling was completed with a helicopter used to fly material and the concrete to the post foundations along the slope. The initial G80/2mm DELTAX drape was still completed as designed to the southern end of the face.

Ground Engineering Capabilities

Ground Engineering Market Sectors

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Australia Headquarters

Block B, Level 1, 

Suite 8 / 247 King St,

Mascot, NSW 2020, 

Australia

+61 (2) 9700 7975

New Zealand Headquarters

15 Kaimahi Rd
Wairau Valley
North Shore 0627

+64 9 837 7808

United States Headquarters

1919 W Elk Pl
Denver, CO 80211
United States

+1 720 452 1191

Singapore Headquarters

80 Robinson Road, #02-00
Singapore 068898

+65 9640 2997

Asset Integrity Maintenance 

Capabilities:

Blasting and Painting

Bridge Maintenance

Certified Fall Arrest Anchor Systems

Concrete Condition Inspections

Concrete Repair and Crack Injections

Condition Surveys

Confined Space

Corrosion Management

Fabrication and Welding

Industrial Cleaning and Water Blasting

Non-Destructive Testing (NDT)

Plant Shutdowns

Protective Coatings and Waterproofing

Refractory Maintenance

Rope Access

Rigging and Heavy Lifting

Seismic and Structural Strengthening

Temporary Access Platforms

Avalanche Protection

Capabilities:

Avalanche barriers and fences

Avalanche towers

Remote avalanche control systems

Snow avalanche protection systems

Snow netting

Basements & Foundations

Capabilities:

Capping Beams

Ground Anchors

Limited Access Drilling

Micro Piling

Mini Piling

Rock Bolting

Seismic Retrofit

Self Drilled Hollow Bar

Shotcrete

Soil Nails

Temporary Ground Anchors

Timber Pole Walls

Geohazard Mitigation

Capabilities:

Active Mesh Stabilisation

Debris Flow Barriers

Design and Build

Devegetation

Drill and Blast

Erosion Control

Geotechnical Inspection & Instrumentation

Rockfall Assessments and Investigation

Rockfall Attenuators

Rockfall Barriers

Rockfall Mesh Drapes

Rockfall Modelling

Scaling and Block Removal

Shallow Landslide Barriers

Ground Anchors

Capabilities:

Ground Anchor Inspection

Ground Anchor Lift Off Test

Permanent Multistrand Ground Anchors

Platipus Anchors

Post Grouted Ground Anchors

Pregrouted Ground Anchors DCP

Removable Ground Anchors

Restressable Ground Anchors

Self Drilled Hollow Bar Anchors

Temporary Multistrand Ground Anchors

Ground Support

Capabilities:

Active Mesh Stabilisation

Bulk Infil Grouting

Cable Bolts

Drill and Blast

Geotechnical Inspection & Instrumentation

Rockfall Assessments and Investigation

Highwall Stabilisation

Longwall Stabilisation

Portal Protection

Rock Bolting

Rockfall Barriers

Rockfall Mesh Drapes

Rockfall Modelling

Scaling and Block Removal

Retaining Structures

Capabilities:

Active Mesh Stabilisation

Design and Build

Drill and Blast

Geotechnical Inspection & Instrumentation

Rock Bolting

Rock Bolting

Rockfall Attenuators

Rockfall Barriers

Rockfall Mesh Drapes

Rockfall Modelling

Scaling and Block Removal

Rockfall Protection

Capabilities:

Active Mesh Stabilisation

Design and Build

Drill and Blast

Geotechnical Inspection & Instrumentation

Rock Bolting

Rock Bolting

Rockfall Attenuators

Rockfall Barriers

Rockfall Mesh Drapes

Rockfall Modelling

Scaling and Block Removal

Rope Access

Capabilities:

Emergency Response

Geotechnical Instrumentation

Supervised Inspections

Slope Stabilisation

Capabilities:

 

Active Mesh Stabilisation

Devegetation

Erosion Control

Ground Support

Retaining Walls

Rock Bolting

Scaling and Block Removal

Shotcrete

Soil Nails

Tunnelling

Capabilities:

 

Canopy Tubes

Ground Anchors

Injection Grouting

Portal Protection

Rock Bolting

Shotcrete

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