Roads on Peat Ron Munro, Project Manager ROADEX IV Inverness, 18 April 2011
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1 Roads on Peat Ron Munro, Project Manager ROADEX IV Inverness, 18 April 2011
2 Roads on Peat: Outline: Peat Survey methods Construction methods Maintenance methods Wind farms Floating road on peat, Ireland, 2010
3 ROADEX Roads on Peat 4 reports on the ROADEX website: ROADEX II Report, 2005 Dealing with Bearing Capacity Problems on Low Volume Roads Constructed on Peat ROADEX II Guidelines, Guidelines for the Management of Peat Slips on the Construction of Low Volume/Low Cost Roads over Peat ROADEX III Executive Summary, 2006 Managing Peat Related Problems on Low Volume Roads FCE/SNH Report, 2010 Floating Roads on Peat
4 Roads on Peat Peat across the Northern Periphery Palsa mires Fens Raised bogs Blanket Bogs
5 REHABILITATION OF ROADS ON PEAT Peat! Peatlands: swamps, mires, fens, and bogs poor material for a road foundation? predominantly water + dead plant fragments up to 95% water, m/c up to 2000% variable shear strength, 2kPa to 40kPa primary consolidation & secondary compression settlement & deformation
6 Roads on Peat The ROADEX method : Map the weak sections of road and FOCUS in on them Understand the processes causing the problems Innovate - find new fit for purpose structures and treatments
7 Roads on Peat DATA COLLECTION: Falling Weight Deflectometer (FWD) bearing capacity of the road Drill core data road structure verification & quality Digital video pavement condition documentation Profilometer FWD & GPS Ground Penetrating Radar road structures subgrade soil quality reasons for road defects GPR, GPS & Video DATA PROCESSING AND ANALYSIS: Road Doctor by Roadscanners Oy ArcView Integrated analysis
8 Roads on Peat Integrated Analysis of survey data GPR VIDEO GPR interpretation Analysis of layers MAP FWD Typical integrated analysis screen from Road Doctor software
9 Route Risk Assessment Class Evaluation 0 No immediate risk for major pavement failure. Local pavement cracking and an increase of rut depth may occur. 1 Pavement failure and rutting may occur but only after continued transportation. Initially these failures will focus on sites where the bound layers are deteriorating or have debonded. 2 Pavement distress (rutting and cracking) will appear on the road a short time after timber transport starts, but they should not cause immediate problems for road users. 3 Severe pavement distress will appear immediately after timber transport is started (less than 5000 axle loads). These major damages may cause problems for road users.
10 Rehabilitation of Roads on Peat ROADEX methodology Five stages: - collect data, identify the underlying problem through surveys - analyse the collected data & understand the processes at work, - innovate, select the most suitable rehabilitation measures, - monitor the work during construction - record and share the experience from the project
11 Rehabilitation of Roads on Peat Buoyancy effects & do no more harm 18kN/m³ Road on a sound foundation 18kN/m³ 10kN/m³ Floating road on peat 18kN/m³ 10kN/m³ Effects of new drains on a floating road P Carlsten SGI
12 Rehabilitation of Roads on Peat Minor carriageway settlement and irregularities No Layer 1 Wearing course 2 Basecourse 3 Steel grid 4 Geotextile 5 Excavation limit
13 Rehabilitation of Roads on Peat Use of steel grids: Full width, no joints
14 Rehabilitation of Roads on Peat Carriageway settlement No Layer 1 Wearing course 2 Basecourse 3 Steel grid 4 Geotextile 5 Road layers 6 Geotextile No Layer 1 Wearing course 2 Basecourse 3 Steel grid 4 Geotextlle 5 LW material 6 Geotextile Cross sections through lightweight rehabilitation structures
15 Rehabilitation of Roads on Peat ROADEX sharing experience Forssa-Somero Road, Finland
16 Rehabilitation of Roads on Peat A837 Ledbeg, Scotland 1.5m 1m 9m Dec 2004
17 Rehabilitation of Roads on Peat B871 Loch Rosail Tyre Bale Embankment
18 Rehabilitation of Roads on Peat Case Histories: B871 Loch Rosail, Scotland
19 Rehabilitation of Roads on Peat Use of tyre bales in a forest road, Ireland, 2006 (J Dempsey)
20 Rehabilitation of Roads on Peat Transition wedges No Layer 1 Wearing course 2 Basecourse 3 Steel grid 4 Geotextile 5 LW material 6 Geotextile Longitudinal section through a transition wedge
21 Rehabilitation of Roads on Peat Summary: - Identify the underlying problems through survey - Understand the processes causing the problems - Innovate - find fit for purpose solutions - Try not cause any further harm - Be innovative and share knowledge, even the failures!
22 Windfarm access roads on peat FCE/SNH Floating Roads on Peat guidelines
23 Windfarm access roads on peat Mechanically stabilised embankment with geogrids
24 Windfarm access roads on peat
25 Windfarm access roads on peat
26 Floating roads on peat - research GPR cross-section
27 Floating roads on peat - research Typical floating gravel road cross-section with GPR
28 Floating roads on peat - research GPR cross section with a two grid system
29 Iron age trackway, c4,000 BC, Derraghan, County Longford, Ireland Thank you
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