Soil Nailing ,Ground Anchors 

Liverton Mill soil nailing slope stabilisation

Location:  Liverton, near Guisborough,
North Yorkshire

Client: St Astier

 

 

soil nailing contractor

Project Overview

 

A landslip had caused the closure of an adopted highway linking the hamlets of Moorsholm and Liverton between Guisborough and Whitby. The road is on an incline and sits between a steep downslope with a beck at the toe on the North side and a significantly steeper upslope on the South side. It was apparent that some type of soil nailing scheme could be a viable solution.

A site investigation report showed that failure to the steep bank 35deg happened following a period of very heavy rain and was likely caused by blocked drainage along the road resulting in water cascading down on to the slope and infiltrating the already saturated ground. Previous slips were evident on adjacent ground, and a series of shallower slips within the main landslip were also present on the site. Some very steep tension cracks and hummocky ground were also evident.

Result

The chosen design solution was the installation of an extensive array of high yield-strength Soil Nails in combination with geotextile erosion protection matting, placed over an area of some 240sqm. The area to be drilled/stabilised was 450sqm, requiring 203 soil nails which varied in length from 6.0 to 13.0m. An array of Ground Anchors was installed above the road. Pennine commissioned the soil nailing design from an external design house.

  

Technical Information

Soil Nailing materials used were Ischebeck-Titan, high yield-strength steel R32/20 tendons, galvanised on the upper length

TEi 550 drillmast

Komatsu PC340 long reach