Project Examples

The following projects have been carried out in the last 3 years. For a full record of my experience please contact me for further information.

Monitoring Slope Stability for Scarborough Council, North Yorkshire.

Scarborough Borough Council’s  local coastal monitoring programme extends along the length of its North Yorkshire coast from Staithes in the north to Speeton in the south, a distance of approximately 68 km.  Coastal settlements include Runswick Bay, Whitby, Knipe Point, Scarborough, Killerby and Filey Flat Cliffs, most of which have defended frontages.  Most of these coastal defences are now ageing, in poor condition and are subjected to an aggressive wave climate.  Furthermore the defences are backed by coastal slopes which show evidence of both instability and climatic denudation.  These factors, together with environmental considerations of predicted climate change scenarios and sea level rise, focus the need for constant pro-active attention in order to minimise the potential risks to the public and coastal assets of the Borough.
Coastal monitoring equipment has been installed at various locations within the Borough and regular readings have been taken and recorded.  
Working for Mouchel I managed a project which reviewed the existing documentation and analysed and interpreted the monitoring data. A strategy was prepared to undertake monitoring to provide early warning and enable appropriate targeted remedial resources. Monitoring was carried out from 2009 and is currently ongoing. The monitoring stragegy included a specific 'wet weather' response where monitoing frequency was increased during periods of higher risk of failure.

Julian delivered a paper on the project at the Ground Engineering Geotechnical Monitoring Conference in London in March 2010. Copies available on request.

Knipe Point -view looking north east along regressing crest showing recent failure.

Inclinometer and peizometer instrumentation used for monitoring in boreholes.

Glyn Valley Slope Stabilisation

The Glyn Valley is a steeply sided river valley through which the A38 runs between the River Fowey and a main line railway higher up the valley side in Cornwall . The 20 m high slope to the river comprised weak materials which were failing to support the road.

Principal Inspection for the Highways Agency identified Class 1 defects and Class 2 areas at risk (HD 41/03). The defects occur in:

While there were no statutory ecological constraints for the scheme significant environmental mitigation measures were consideration needed to be taken of protection of a spawning river for salmon, a bat population, and visual impact.

The preferred option was an ‘embankment buttress’ to the valley slope at either 1 in 2 or 1 in 3, but this could only be achieved for part of the defect because of environmental and physical constraints.

Working at Mouchel  I designed a composite solution to take into account environmental and physical constraints which comprised three elements:

Gabion wall used for part of the road support above the River Fowey.

Installation of king piles during night time working on the A38, required where there was insufficient space for gabions or a soil batter

Slope stability analysis for composite gabion / soil batter.

Combe Down Stone Mine Stabilisation, Bath, UK

The Combe Down Stone Mines Project is a major project by Bath & North East Somerset Council to stabilise abandoned limestone mine workings in Combe Down and address the Health & Safety issues in the area. 

There are in excess of 300 residential properties, as well as schools, churches and community facilities overlying the mine.

Julian working for Mouchel was appointed to the Government funding body, English Partnerships (Homes and Communities Agency), to oversee the project’s compliance with economic, ecological and Health and Safety constraints.

The mines are located in the village of Combe Down, within the World Heritage Site of the City of Bath and cover an area of approximately 6.2 hectares.

Julian was a technical advisor to English Partnerships, checking that Best Practice and Value for Money principles are adhered to by the appointed contractor to ensure that the project, the largest in the Government’s Land Stabilisation Programme, is managed within the constraints of time and cost.

A badly ‘robbed’ pillar of limestone supporting the roof only 5 m below overlying property at Combe Down village, Bath.

Infilling of Combe Down stone mine with foam concrete

Temporary tunnel support for Hong Kong Mass Transit Railway Tunnels MTR, for Donaldson Associates Ltd.

Temporary design was undertaken for an expanding mass transit railway system which required tunnelled sections. The temporary lining comprises both rock dowels and steel fibre reinforced sprayed concrete installed in the shaft walls. Forepoling and steel arches were required in areas of poor ground where the bedrock granite has decomposed to various degrees by weathering.  The density of rock dowels and thickness of sprayed concrete is determined using the Norwegian Geotechnical Institute ‘Q’-method.

Stabilisation of underground mine workings below London Penzance railway, at Gover, Cornwall,

The possible presence of old mine workings below the track requires an initial investigation and subsequent design of stabilisation measures. A geotechnical ground investigation was undertaken in 2010 to identify the ground conditions along a section of Network Rail land near Gover, St Austell. Mouchel supervised the drilling of thirteen boreholes, one trial pit and one trial trench during site works between the 21 September and 02 October 2009.  This was further backed up by a more detailed survey in May 2010 with geophysics (density, GPR and magnetometer) by Fugro and confirmatory boreholes. The purpose of the site investigation was to identify the depth to bedrock in locations either side of the mine feature to aid in the plugging and capping design.

Drawing showing the composite ground investigation / geophysical survey to identify the presence of old mine workings below the London to Penzance railway line, at Gover near St Austell, Cornwall.