HOMER TUNNEL

Geohazard mitigation with blasting to remove a feature above the Homer tunnel on SH94 in the magnificent Fiordland region

Project Overview

 

Geovert assessed the feature with NZTA engineer’s Opus, and determined the rock mass was failing in a combination sliding
rotational toppling mechanism with less than 10% of the toe area
providing the only point of attachment.

 

As a result of this inspection the road was closed to all traffic until the drill and blast removal of a 25m high 2000 tonne unstable rock mass was removed. This was located 900m vertical above the western portal of the Homer Tunnel at 1800m ASL and the contract period began in May which meant dealing with severe alpine weather conditions.

 

Geovert Solution

 

The rock mass was deemed highly unstable and a drill and blast programme was implemented under urgency to remove it. A series of extensometer points were installed to monitor for any movement during drilling and for post blast inspection. The blast design was engineered to maximise fragmentation and reduce damage
to existing highway furniture including the newly completed
temporary portal extension structure. Drilling was completed
for 23 holes, with 300kg of high velocity explosives used. Post blast
scaling and inspection was completed to allow the road to reopen. 
Several storm events resulted in 200km/h winds, minus 18degtemperatures, numerous snow events with over 2m falling duringthe contract period and over 500ml of rain.

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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