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Slope Stability - Via Gellia, Derbyshire 2017

Rope Access vegetation clearence prior to drilling works beginning

Slope Stability - Via Gellia, Derbyshire 2017

Showing the large loose block being stabilised by Spider® S3-130

Slope Stability - Via Gellia, Derbyshire 2017

Looking West at the loose block stabilised by Spider® S3-130

Slope Stability - Via Gellia, Derbyshire 2017

Image showing the DELTAX® G80/2 mesh with underlayed Spider® S3-130 at lower right edge

Slope Stability - Via Gellia, Derbyshire 2017

DELTAX® G80-2 over full height of slope

Slope Stability - Via Gellia, Derbyshire 2017

DELTAX® G80/2 drape

 

Year of installation

2017

Initial situation

During routine maintenance of the rock slope it was noted that a large block was very close to failure. AECOM undertook the geological mapping and survey.

Description

AECOM designed a DELTAX® drape to 90 % of the slope to control the weathering and failure of the rock slope. The large block is a different issue and SPIDER® S3-130 was specified to hold the large block in place. The site was cleared of vegetation, any large trees were treated with eco plugs to kill off the growth of the stump.

Using DTH (down the hole hammer) drilling methods working from top down 3 metres deep GEWI 25 bar was installed. The upper 3 rows of bolts were installed with resin grout, the lower rows were grouted with OPC water mix.

The SPIDER® S3-130 mesh was installed first and secured at all edges with 14 mm wire rope and P33 system spike plates. 

Once all the bolts had been installed the DELTAX® G80/2 mesh was installed from top down over the full site including over the top of the SPIDER® S3-130 mesh. This was profiled in place with P33 system spike plates.

12 mm boundary rope was installed and tensioned to the rockface on all edges. This 12 mm rope was secured to the DELTAX® G80/2 mesh with T2 compression claws.

The road was reopened to public use just 11 days after closure. A total of 946 m² of DELTAX® G80/2 and 235 m² of SPIDER® S3-130 were installed with 44 number 3 meters long GEWI 25 bars.

Customer

Derbyshire County Council

Engineering

AECOM Chesterfield Office

Contractor

CAN Geotechnical

Protected object

Road, Mine / Quarry

Corrosion protection

GEOBRUGG SUPERCOATING, GEOBRUGG ULTRACOATING

Your local contact

René Müller
   

René Müller

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

Natural Hazards
Hydraulic Engineering
Mining / Tunnels
Geobrugg AG,Industriestrasse 21,5200 Brugg / Switzerland Country Manager Kantone AG BE BL BS FR GE JU NE SO VD VS

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Olivia Sartorius
   

Olivia Sartorius

Natural Hazards
Hydraulic Engineering
Mining / Tunnels
Geobrugg AG

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Alexander Bittendorfer
   

Alexander Bittendorfer

Project Manager Inspection Services

Natural Hazards
Geobrugg AG,Trucks via road 14 or 13 only!, Aachstrasse 11,8590 Romanshorn / Switzerland Project Manager Inspection Services

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Isacco Toffoletto
   

Isacco Toffoletto

Natural Hazards
Hydraulic Engineering
Mining / Tunnels
Geobrugg AG Ticino,Via Brusada 5,6933 Muzzano / Switzerland

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