Geological Survey of Ireland Landslides Workshop 21 April 2009
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1 Investigation & Repair of a Small Landslide on the Torr Head Coast Road, North Antrim Mark Cassidy, Byrne Looby Partners (formerly Doran Consulting Geological Survey of Ireland Landslides Workshop 21 April 2009
2 Presentation Format Back ground Landslip Field & laboratory studies Repair options Preferred solution Construction
3 Project Background Roads Service Consultancy Framework Contract COMMISSION NO: F5/12 C82 Torr Road Slip ROADS SERVICE DIVISION: Northern
4 Site Location Site
5 Site Location Site Extract OS Discovery Series Map Sheet 5
6 Located on Coastal Route Site NITB Giants Causeway & Coastal Route Torr Head
7 Torr Head Road 4m wide road, 0.5 to 1.0m wide verges Road positioned on sloping ground that falls towards sea cliffs Sections with gradient steeper than 1 in 5 30km diversion if closed History of small landslides
8 Landslip Occurred Jan 2005 Pre-slip slope angle = 40 degrees Scarp height = 0.75m Length = 14m Width = 8m Estimated volume = 50m 3 Shallow planar (or translation) slip affecting the grass verge adjacent to the road, but not the road. Damp brown sandy clay with gravel and cobbles exposed along the sliding plane
9 Adjacent section of road Tilted road boundary fence Developing tension crack/settlement trough (40m long 1 to 2m into road) Tension Crack
10 Roads Service Previous works Four visible adjacent retaining structures Horizontal terraces along slope Rock Armour/Mass Concrete Wall Cracked Masonry Wall 2005 Slip Masonry Wall Repair 2003 Terraces
11 Clearly Problem Stretch of Road Next Step: Investigate inaccordance with HD22/02 Managing Geotechnical Risk (now HD22/08)
12 HD22/02 Systematic Certified Approach Initial review categorise site Procedural Statement Preliminary Sources Study (Desk Study) Geotechnical Report (summarising all investigations & providing design parameters Geotechnical Design Geotechnical Feedback Report
13 Published Geology Quaternary Glacial Deposits Solid - Metamorphic psammites and shists Site Extracts Solid & Superficial Geology Maps, Northern Ireland Site
14 Desk Study Roads Service carried out repair works to the masonry wall during 2003 Road present on OS 1 st Edition maps
15 Topographical Survey Complement to walkover survey 160m plan length of road 11 cross sections Points at approx 1m intervals
16
17 Ground Investigation 4 No window sample holes with ground water stand pipes by Geotechnical & Environmental Services Ltd Granular Fill (GL 0.4m) Glacial Till (reworked?) ( to 3.6m) Completely weathered schist
18 Stability Back Analysis Limit State Equilibrium FoS dry 0.8 FoS saturated 0.4 Therefore solution needs to accommodate groundwater Simple planar analysis FOS = Tan Tan = slope angle (40 o ) =effective angle of shearing resistance (35 o )
19 Risk Assessment to HD41/03 Purpose to: Determine nature of feature Level of risk If any actions required
20 Risk Assessment Table
21 Repair Options Remedial options to be considered are: 1. Reinforced concrete L-shaped retaining structure under road 2a&b. Anchored embedded retaining wall (secant pile wall or sheet pile) in verge alongside road. 3. Reinforced soil 4. Reinforced concrete L-shaped retaining structure placed down slope at toe of slip with imported granular backfill. 5. Soil nailing.
22 Option 1 Reinforced concrete L-shaped cantilver reinforced concrete retaining structure under road Option 2 Anchored embedded retaining wall (secant pile wall or sheet pile) in verge alongside road.
23 Option 3 Reinforced soil slope using imported granular backfill. Option 4 Soil nailed slope
24 Option 5 Reinforced concrete L-shaped retaining structure placed down slope at toe of slip with imported granular backfill.
25 Comparison of Options Preferred Option: Embedded Contiguous Pile Wall (400mm dia piles at 500mm cc) with Passive anchors (tension piles)
26 Preferred Option
27 Construction April June 06 Key Issues: Access to site Working width Stability of Plant Duration of Road Closure
28 Completed June 06 Thank you
29 BELFAST DUBLIN BLP OFFICES ABU DHABI LONDON GALWAY
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