es
at Cambridge in July 1992.
This paper reports on seven Soil Nailing contracts
involving stabilisation of existing walls and both new and existing
slopes. Current tendon corrosion protection systems and costs
are highlighted and development of new non-corrosive tendons
is summarised.
- Soil nailing to stabilise existing retaining walls
- Denholme Clough, Bradford.
- Cymsifiog Primary School, Glamorgan.
- Beaufort Road, Bristol.
- Ampthill Road, Bedford.
- Soil nailing to stabilise slopes.
- Temporary soil nail support in Birmingham.
- Permanent support, Dolywern, Clwyd.
- Lakeside, Thurrock.
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"Trial Soil Nails for Tunnel support in London Clay and the Detected Influence of Tendon Stiffness and Bond Length on Load Transfer". A D Barley and M Graham, Proceedings of Third International Conference on Ground Improvement Geosystems, London 1997
The use of soil nails was adopted to allay concern about the stability and to reduce the deformation of the 80 square metre faces of the Terminal Four platform tunnels which form part of the Heathrow Express Rail Link Project.
Prior to installation in the tunnel, a series of trials was carried out to select the optimum combination of soil nail tendons (steel or glass-reinforced plastic), borehole diameter, minimum fixed length and a suitable grout for nails with a maximum mobilised load potential of 200kN to provide short term face restraint.
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"Controlling Factor". Ground Engineering
February 1999.
Tony Barley assesses the influence of the installation
process on the performance of soil nails
Industry reservations about soil nailing in the 1980's meant
a slow start for the technique in the UK, but it is now an
accepted practice for the stabilisation of vertical or steep
slopes and is commonly used to improve the stability of existing
slopes and walls.
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"Slope Stabilisation by Soil Nails and Replacement by Anchored Bored Pile Wall for Area Development". Ground Engineering
February 2002.
The inspection of insitu geotechnical components after a decade or more of use is infrequent. Soil nails are still considered to be novel, and development is only just emerging from infancy.The opportunity to inspect partially exhumed soil nails and report on evidence of only mild forms of corrosion in the upper nails is therefore of value to the industry. The satisfactory performance of the nailed slope enhances confidence in the soil nail solution, although attention should always be paid to the potential corrosion of the tensile member.
The slope replacement by a bored pile wall incorporating very high capacity multiple anchors confirms that safe working capacity of anchors in soil and weak rock has been safely doubled within the last decade.
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"New Zealand Tourist Town Expands Using Multiple Anchors and Actively Stressed Soil Nails for Slope Retention". Author : A.D. Barley. Edited version in Ground Engineering, August 2004
The inspection of insitu geotechnical components after a decade or more of use is infrequent. Soil nails are still considered to be novel, and development is only just emerging from infancy.The opportunity to inspect partially exhumed soil nails and report on evidence of only mild forms of corrosion in the upper nails is therefore of value to the industry. The satisfactory performance of the nailed slope enhances confidence in the soil nail solution, although attention should always be paid to the potential corrosion of the tensile member.
The slope replacement by a bored pile wall incorporating very high capacity multiple anchors confirms that safe working capacity of anchors in soil and weak rock has been safely doubled within the last decade.
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Actively Stressed Soil Nails
