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Estabilização de taludes - Wadhurst Cutting (City End) 2022

Protected tunnel portal, photo by BAM Ritchies

Estabilização de taludes - Wadhurst Cutting (City End) 2022

Installation of the protective mesh

 
 

Ano de instalação

2022

Situação inicial

Wadhurst Cutting (city end) is located along the Tonbridge to Hastings railway line in East Sussex and has provided key transport links between London and Hastings for the past 170 years. Following a number of failures of an oversteepened cutting in 2014, 2016 and 2019, both at the city end and country end of the cutting, which are separated by a short tunnel BAM was engaged to install an approved solution (designed by Byrne Looby) to remediate the cutting. The initial emergency works were undertaken on the country end of the cutting and are not detailed here.

Instability originated from over-steepening sections of the cutting, which is made up of the Wadhurst Clay Formation (clay/mudstone) and the Ashdown formation (sandstone & siltstone).

Geologia

Geology on site consisted of the Wadhurst Clay Formation which is primarily a mudstone which had weathered to clay in the upper section where it had been exposed to continuous weathering. Underlying the mudstone are sandstone and siltstones of the Ashdown Formation.

Descrição

Due to the size and complexity of the project, with

  • heights of the cutting ranged from 8 - 18 meters
  • approximately 300 meters in length
  • a tunnel portal at the southern extent of the site

a range of geotechnical solutions was installed. Given the proximity to the track, part of the works was completed in a seven-day blockade of the line in October 2021.

Extensive soil nailing was undertaken around the tunnel portal, where nails between 10 - 12 meters in length were installed. Prior to soil nailing, TECCO G65/3 mesh was laid as a temporary protection measure to prevent any loose material from falling onto the track during drilling; the mesh was then drilled through as nails were installed. 

On both the cutting's up and down lines, approximately the upper 6 - 8 meters of the faces were remediated using an active soil nailing (28 mm diameter) and meshing (TECCO G65/3). Due to the contouring of the existing slope creating a slight overhang, below this section, down to track level was remediated with a passive drape system (TECCO G65/3) with regular nailing along the base of the slope along with some intermittent profiling nails.

The result was across the entire cutting (city end), over 16,000 square meters of TECCO G65/3 was installed, and over 14,000 meters of soil nails and rock bolts were drilled (across approximately 3000 locations). Going forward, the remediation will ensure fewer disruptions to rail users while also increasing staff and public safety on the railway for its 60-year design life. 

Promotor

Contratante

Objecto protegido

Caminho de ferro

Proteção contra a corrosão

GEOBRUGG SUPERCOATING

Empreteiro

O seu contacto local

Roger Moor
   

Roger Moor

Country Manager Ost- und Zentralschweiz, Liechtenstein

Riscos naturais
Engenharia Hidráulica
Mineração / Túneis
Geobrugg AG,Aachstrasse 11,8590 Romanshorn / Suíça Country Manager Ost- und Zentralschweiz, Liechtenstein

E-mail

René Müller
   

René Müller

Country Manager Kantone AG BE BL BS FR GE JU NE SO VD VS

Riscos naturais
Engenharia Hidráulica
Mineração / Túneis
Geobrugg AG,Industriestrasse 21,5200 Brugg / Suíça Country Manager Kantone AG BE BL BS FR GE JU NE SO VD VS

E-mail

Alexander Bittendorfer
   

Alexander Bittendorfer

Project Manager Inspection Services

Riscos naturais
Geobrugg AG,Aachstrasse 11,8590 Romanshorn / Suíça Project Manager Inspection Services

E-mail

Isacco Toffoletto
   

Isacco Toffoletto

Ticino Country Manager

Riscos naturais
Engenharia Hidráulica
Mineração / Túneis
Geobrugg AG Ticino,Stabile Cometal, via Pizzante 7,6595 Riazzino / Suíça Ticino Country Manager

E-mail