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Wadhurst Cutting (City End)

边坡稳定 - Wadhurst Cutting (City End) 2022

Protected tunnel portal, photo by BAM Ritchies

边坡稳定 - Wadhurst Cutting (City End) 2022

Installation of the protective mesh

 
 

安装年份

2022

情况

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).

地質學

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.

描述

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. 

客户

承包商

防护对象

Railway

腐蚀保护

GEOBRUGG SUPERCOATING

工程

本地联系方式

Kevin H. Coyle
 

Kevin H. Coyle

Regional Manager Northeast

自然災害防護
Hydraulic Engineering
Geobrugg North America, LLC,3 Beaudet Terr,Columbia CT 06237 / 美国 Regional Manager Northeast

联系地址

Saleh Feidi
 

Saleh Feidi

Regional Manager California

自然災害防護
Hydraulic Engineering
Geobrugg North America, LLC,8921 Emperor Ave.,San Gabriel, California 91775 / 美国 Regional Manager California

联系地址

John Kalejta
 

John Kalejta

Regional Manager Central US

自然災害防護
Hydraulic Engineering
Geobrugg North America, LLC,3215 67th Avenue Pl,Greeley CO 80634 / 美国 Regional Manager Central US

联系地址

Bob Lyne
 

Bob Lyne

Regional Manager Southeast

自然災害防護
Hydraulic Engineering
Geobrugg North America, LLC,8004 Windspray Drive,Summerfield NC 27358 / 美国 Regional Manager Southeast

联系地址

Pierce Runnels, Civil Engineer
   

Pierce Runnels

General Manager Geobrugg North America

自然災害防護
Geobrugg North America, LLC,22 Centro Algodones , Civil Engineer General Manager Geobrugg North America

联系地址

Tim Shevlin
 

Tim Shevlin

Sales Director

自然災害防護
Geobrugg North America, LLC,Salem OR 97302 / 美国 Sales Director

联系地址