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Research Report 222 Natural hazard risk management for road networks: part II: implementation strategies

Published: | Category: Natural hazard risk management , Research programme , Research & reports | Audience: General

Road networks are lifelines for the community and are essential for the economic and social well-being of New Zealand. Significant natural hazard events can cause widespread damage to transportation networks, leading to significant repair costs to road controlling authorities, access difficulties for emergency services and disruption to road users and the community at large.

Research Report 058 Seismic assessment of New Zealand highway bridges: development and testing of preliminary screening procedures

Published: | Category: Natural hazard risk management , Research programme , Research & reports | Audience: General

A preliminary screening procedure for the prioritisation of New Zealand State Highway bridges is presented. The procedure is designed to identify bridges which justify detailed assessment of their earthquake resistance. The derivation of the procedure is described and the source material is listed. The results of a pilot application carried out in 1994 of a preliminary version of the screening procedure are presented. The pilot application considered 29 bridges on State Highway 1 between Bulls and Wellington, North Island. The results from the screening procedure were compared with those from an economic analysis which used base data from an approximate structural assessment. The comparison led to some modifications being made to the preliminary procedures to produce the final version. Results of the comparison and details of the modifications are presented.

Research Report 382 Using risk analysis to assess treatments for frost and ice

Published: | Category: Natural hazard risk management , Research programme , Research & reports | Audience: General

The comparative effects on skid resistance of the two commonly used treatments for frost and ice on New Zealand roads, mineral grit and the anti-icing/de-icing agent calcium magnesium acetate (CMA), were examined through an on-road test programme. This involved locked-wheel braking tests on selected test sites under a variety of conditions using an instrumented car. Tests were conducted for various treatments, including dry (no treatment), wet, application of grit and application of CMA. Road surface types included fine and coarse chipseal, open-graded porous asphalt, asphaltic concrete and slurry seal. Comparisons of skid resistance were made between the different surfaces and different road surface treatments. Additional laboratory tests were conducted to assess the comparative variation of skid resistance with time following treatment. Typical traffic levels were also obtained for the test sites. These were combined with the changes in skid resistance for the different treatments at different times to provide an...

Research Report 147 Security of New Zealand's strategic roading system

Published: | Category: Natural hazard risk management , Research programme , Research & reports | Audience: General

The reliable operation of New Zealand's road network is critical to both its economic success and its social development. Disruption to some parts of the network may therefore have a large negative impact on these.

Research Report 148 Risk assessment methods in road network evaluation

Published: | Category: Natural hazard risk management , Research programme , Research & reports | Audience: General

This study, carried out in 1998, investigates hazards that have the potential to close the Desert Road, which traverses for some 60 km the Central Volcanic Plateau of the North Island, New Zealand, at around 1000 m altitude. It is part of New Zealand's major north-south link, State Highway 1, and it provides a case study for the application of risk assessment methodology to the evaluation of road networks in New Zealand.

Research Report 208 Progressive underslip stabilisation using gravel columns

Published: | Category: Natural hazard risk management , Research programme , Research & reports | Audience: General

This report presents the findings of the monitoring programme undertaken by GHD at Snake Hill (SH1 RP 144/11.34), a road slip site which was stabilised using graded gravel column drains. Monitoring of pore water pressures was undertaken using piezometers, inclinometers were monitored to determine deformation, and computer simulated back analysis was undertaken. This report discusses the results of the monitoring programme, and asserts that the column drains have provided effective positive subsurface drainage to the failure planes, resulting in the stabilisation of the site. It also discusses the typical cost of methods for the stabilisation of deep-seated road failures driven by high pore water pressures, and finds that column drains are comparatively cost-effective.

Research Report 272 Standardisation of design flows for coastal catchments in New Zealand

Published: | Category: Natural hazard risk management , Research programme , Research & reports | Audience: General

As one of the outputs from the Transfund research project Standardisation of Design Flows and Debris Control Intake Structures, the purpose of this report is to provide further information for the bridge and culvert designer on hydrological approaches that are appropriate to the estimation of design flows in low-lying coastal catchments. Keywords: catchment, coastal, debris control, design flow, hydrology, New Zealand, residential zone, roads, rural zone, transport, urban, urbanisation

Research Report 159 The effect of link reliability on benefit/cost ratios

Published: | Category: Natural hazard risk management , Research programme , Research & reports | Audience: General

This report develops project evaluation procedures to incorporate risk assessment of road link reliabilities. The current Transfund evaluation procedures and recent work in this area are reviewed and suggested directions discussed. Simple link reliabiity theory is then developed, as well as typical examples of how this theory could be applied. The application of this theory within a project evaluation context is also considered.

Research Report 217 Natural hazard risk management for road networks: Part I: risk management strategies

Published: | Category: Natural hazard risk management , Research programme , Research & reports | Audience: General

Road networks are lifelines for the community and are essential for the economic well-being of New Zealand. Significant natural hazard events can also cause widespread disruption to transportation, leading to significant repair costs to road controlling authorities, access difficulties for emergency services, and disruption to road users, tourists and the community at large.

Research Report 276 Developing a hazard risk assessment framework for the New Zealand state highway network

Published: | Category: Natural hazard risk management , Research programme , Research & reports | Audience: General

The New Zealand Civil Defence Emergency Management (CDEM) Act (2002) requires all lifelines, including the road network, to be able to function to the fullest possible extent during and after an emergency, and that lifeline providers have plans for such continuity that can be made available to the Director of CDEM if requested. To be able to meet this legislative requirement, road network managers require a comprehensive framework for identifying, evaluating and managing risks to the road network. This risk management framework needs to strike an appropriate balance between capturing the complexities of hazard risks to the road network, and the need to be cost-effective, achievable, and likely to be taken up and actively used by those people managing the road network. Keywords: hazard, risk management, risk assessment, road, road closure, State Highway
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