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Geotechnical seminars

CIVILS 2006

Geotechnical subjects feature strongly throughout the extensive seminar programme that accompanies Civils 2006. Attendence is free and seats are allocated on a first come, first served basis. The programme of geotechnical seminars is listed here with short summaries. Please note that some details were not available as GE went to press but will be posted on www. civils. com when they are confirmed.

Tuesday 28 November

11.30 Red Theatre Foundations into the 21st Century John Patch, director, Roger Bullivant The market continues to change and evolve and those who don't embrace innovation in all its guises will suffer. This talk seeks therefore to identify the drivers for innovations and the thinking behind certain new and improved products and systems. It will not present a boring list of so called new products and systems, but a demonstration of the reasons for adopting certain innovative pathways.

13.45 Blue Theatre Delivering cost savings and sustainability objectives in regeneration projects with the innovative use of mechanical stabilisation and reinforced soil solutions John H Dixon, special projects engineer, Tensar International Using case studies and calling on 25 years of experience, this seminar will look at how reinforced soil and mechanically stabilised layers are being applied to resolve some tricky problems as well as delivering real cost savings in some of the more routine aspects of regeneration schemes. Examples will be shown of capping over ultra soft waste lagoon deposits;

reducing aggregate thicknesses in permanent roads over weak or variable ground and building more economical working platforms for piling rigs and heavy crane access.

14.30 Red Theatre Geophysics and regeneration Andrew Trafford, ground investigation manager, Aperio An update on the role of geophysics for ground and structural investigations in regeneration projects, describing the main methods and presenting a number of case studies. The talk will cover advances in technology.

15.45 Blue Theatre Who's responsible for sewerage flooding?

Jonathan Hatcher, eastern region director, Mott MacDonald Group Cutting edge techniques and software are allowing Mott MacDonald to identify sewer flooding causes and properties at risk. An integrated approach is needed to deal with flooding, particularly for urban areas where complex drainage systems interact and problems often have no 'owner'. Mott MacDonald will detail how it is looking at a large number of sewer flooding problems, and also carrying out projects including both urban and rural catchment studies to provide an effective and visual method of identifying issues and risks.

Wednesday 29 November

11.30 Red Theatre Alternative foundation solutions using ground improvement methods George Shepheard, geotechnical adviser, Con-Form Contracting Ground improvement can be achieved through many different approaches but the prime goal generally is to increase the bearing capacity of the soils which is achieved by increasing the shear strength of cohesive soils and the angle of internal friction of granular soils. Many approaches are not exclusive and often a combination will provide the best solution. The presentation will focus on soil stabilisation and rolling dynamic, explaining what each of the processes are and how the synergies of two competing technologies that enabled Con-Form to produce its new E-Found foundation. Technical case studies will show how these processes were put into practice.

12.45 Blue Theatre High definition surveying for civil engineers Steven Ramsey, HDS UK project engineer, Leica Geosystems Three dimensional terrestrial laser scanning or high definition surveying (HDS) is providing a wealth of information for all engineers in the civils environment.

Using Leica's Cyclone and Cloudworx this 3D data can be used to check structural deformation, model surfaces, merge digital photos and integrate directly with CAD systems.

13.30 Red Theatre Advances in ground investigation Rob Gardiner, business development manager, Lankelma Cone penetration testing (CPT) applies state-of-the-art technology to site investigation. In addition to high-quality, in situ testing, the technology can be used for the installation of instrumentation and ground source heat exchangers.

This presentation explains the historical background and looks at test procedures, interpretation and reporting. Advances in CPT technology and new systems will follow and the session will end with a look at the use of the technology for both onshore and marine testing.

13.45 Blue Theatre Prestressed concrete retaining walls, Milbury Systems Concrete specialist Milbury Systems will demonstrate its wide range of precast and prestressed concrete products, structures and services, with particular emphasis on concrete retaining walls. The company will present its Rocket Wall, an innovative and patented Y-shaped product that allows storage of material within a freestanding wall without protruding feet, and Karapace, Milbury's revolutionary concept in precast retaining walls.

14.30 Red Theatre Foundations for a large motorway sign in a few hours?

A reality not a dream Peter Dunn, chairman, Screwfast Foundations; and Keith Cook, framework manager, Nuttall-Hynes Peter Dunn promises a 'mindreading act' to open this introduction to screwpiling. He will then outline how a ve-year long campaign for the acceptance of the Screwfast system reached a milestone in June this year with the construction of an MS3 (large motorway sign) in 10 working hours. Keith Cook from the framework contractor will explain how this was achieved on junctions 12-13 of the M11.

14.45 Blue Theatre Delivering a Tube for 2012 Ian Copeland, director of projects, Tube Lines The target of producing a modern and efcient set of tube lines in time for the London Olympics in 2012 will be the central theme.

Improvement will be a continuous process between now and then, and build on achievements already in station upgrades, line and rolling stock improvement with special attention to disability access.

15.30 Red Theatre AB Chance helical piling system Duncan Robson, UK Operations director, Sub Surface Technologies This presentation will cover a brief history of screwpiles and their evolution, in the US and then Europe for building use.

The installation of the piles will be explained, emphasising that only small standard construction plant is required for the work.

Typical projects where the system is suitable are outlined, especially when access is limited, or noise, vibration and spoil removal are issues.

Thursday 30 November

10.30 Red Theatre Mobile terrestrial laser scanning Ian Anderson, 3D Laser Mapping 3D Laser Mapping's new StreetMapper system will be reviewed, beginning with a general look at laser scanning technology, and then terrestrial laser scanning principles, and moving on to the specics of the StreetMapper system, its principles and the technology behind it. The development of StreetMapper provides a unique mobile approach to the capture of LiDAR data, using airborne scanning technology mounted on a variety of groundbased vehicles. Survey methodology and accuracies will be considered and then applications in highways, rail and city modelling with some case studies. The presentation will describe the advantages of the StreetMapper system for a variety of applications, with supporting case studies.

10.45 Blue Theatre Pre-cast concrete buried arch structures - The development, benets and application of Matière system Sean Minihane, director, ABM Group; and Mike Sanderson, UK business development manager, ABM Design & Build Matière precast buried arch structures offer an innovative, cost-effective solution in bridge, culvert and underpass applications.

Originally developed in the early 1980s for hydraulic applications in France, the concept has been developed to use precast concrete elements which can be easily transported to site and quickly connected using a ball and socket joint. The system can use spans from 3m to 20 m and offers true 'value engineering' through rapid design and construction; factory controlled quality; self-stabilisation;

exible open or closed cell conguration; soil structure interaction; and cost effectiveness.

The presentation will review the development of the Matière system, highlight the benets at all stages of the construction process and give examples of its use in a number of prestigious structures both in the UK and worldwide.

11.45 Blue Theatre Third generation geosynthetics Chris Quirk, Naue Geosynthetics Geogrids are increasingly in demand for the construction of structures including roads, foundations, railways, runways and carparks.

Geogrid technology has moved it is now into the third generation.

This presentation will show Naue's understanding of how geogrids work and why they are manufactured the way they are.

12.45 Blue Theatre Permeable pavements and the use of geotextiles Dr Stephen Coupe, associate lecturer and research fellow in sustainable drainage, Coventry University; and Formpave UK Permeable block paving is now routinely used within urban drainage to provide an attractive, durable surface combined with the required levels of ow attenuation and pollution prevention associated with Sustainable Drainage Systems (SUDS). Geotextiles are manufactured synthetic fabrics, routinely used for many geotechnical applications such as separating aggregate layers, liners for membranes and for slope stabilisation. The combination of these innovations has been shown to provide multiple environmental benets with a fully integrated pollutant trap, oil bioreactor and water recycling and reuse system.

Early research into the potential for incorporating geothermal heating and cooling systems, into permeable pavements for domestic users, will also be presented.

13.45 Blue Theatre Dounreay shaft isolation project - an update Ian Dalgleish, director and general manager, Ritchies division of Edmund Nuttal The seminar will cover the work done to date on a technically challenging project to empty intermediate level radioactive waste from an old 65m deep construction shaft which was used as a repository during early operation of the Dounreay nuclear reactor and experimentation site now being decommissioned. To allow the shaft to be emptied it must rst be hydraulically isolated from the country rock. In late 2004 a design and construct contract was let by UKAEA to Ritchies with Halcrow as the designer to undertake the isolation works.

Ground investigation, trials, the diversion of a drain and the construction of the raised working platform have been undertaken over the past two years.

The presentation covers some of the drilling, grouting and measurement challenges addressed and overcome during extensive trials work as well as the preparations for the main isolation works starting now, and due for completion in the rst half of 2008.

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