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LandfillsThe capping solutions
Capping lining system(temporary and ultimate)
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• The standard solution according to European standards
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Capping
1,5m
0,03
m
GCD
GCDGCL/GM
TRM,standard andtextured GG
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Maccaferri products vs APPLICATION
SOIL FOUNDATION GEOTECHNICAL IMPROVEMENT
SOIL REINFORCEMENT
APPLICATIONS WITH
AGGRESSIVE SOIL:
contaminated soils, high ph & similar,
wastes
BOTTOM LINING
SOIL REINFORCED SLOPES WITH CLAY
SOIL REINFORCED SLOPES WITH WASTES and CONTAMINATED SOILS
CAPPING SYSTEM
REINFORCED STEEP SLOPE & Capping SYSTEM
SOIL REINFORCEMENT APPLICATIONS WITH COHESIVE
SOIL OR STANDARD CLAY
Paragrids, Paralink
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Maccaferri products vs APPLICATION
CAPPING SYSTEM
Biogas Drainage – if applicable
Soil Veneer reinforcement
Drainage Water Rainfall
Textured geogridsWaterproofing
- Standard geogrids
+Turf reinforced mats
Erosion control natural blankets
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propylene mat with waved profilegitudinal channel shape) of various thicknessvarious mass:
type
W
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ESTING OF GEOCOMPOSITES ACCORDING TO EN AND ISO:
The following tests are applicable to draining geocomposites:
Short term flow rate test (EN ISO 12958)
Compressive creep test with shear load applied (EN ISO 13432)
ction peel and junction shear tests for geocomposites (EN 13426-2)
Direct shear test (EN ISO 12957-1)
Inclined plane test (EN ISO 12957-2)
Long term protection efficiency test (EN 13719).
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MacDrain®
nder normal compressive creep loads of 50, 100, 200 and 500 kPa using both theIsothermal Method (SIM) and of time-temperature superposition (TTS) in accordance
M D7361-07(2012) and the ISO 25619-1:2008 up to 120 years design life.
tion, tests under normal and shear loadsperformed to simulate drainage on slopesngs) with a load of 50kPa. The flow rate ofocomposites is obtained by applying a set oftion Factors which take into account all the
mena that may decrease the flow rate overtire design life compared to the short termate measured in EN ISO 12958:2010 orD4716-08 (2013) tests. With the information
ed through performance tests, Design Datas (DDS) were developed for eachrain product providing reduction factors
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Final capping of GelloITALY (Pisa), 2011-2013MacDrain W 1081drainage geocompositeused as soil gas drainageand as rainfall waterdrainage in the finalcapping lining.
MacDrain W Drainage Composites
ing of Cavenagoano), 2012W 1051 drainage
osite used as soil gas
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most popular reinforcement are turf mats reinforced with a ymeric geogrid or with a metallic reinforcement or texturedgrids; 3d material are preferred to standard biplanar geogridshe interface with GCD to better contain the soil
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Final capping of ChivassoITALY (Torino), 2010MacMat R350 geocom-posite used to stabilize thelatest lift of vegetative soilhaving a 3.3 ft thickness on30°sloped finished surfaces.
MacMat R1 Turf reinforced Mat
Final capping of GavorranoITALY (Grosseto), 2001MacMat R1 8127GNgeocomposite used tostabilize 2 ft of vegetative soilon 35° sloped finishedsurfaces.
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Final capping of Montecalvo in FogliaITALY (Pesaro & Urbino), 2010MacGrid T200 geocomposite used (13,900yd2) to stabilize the latest lift of vegetative soil having a 3.3 ft thickness on 30°sloped finished surfaces.
MacGrid Geogrids
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MacGrid Geogrids
Final capping of Avlona LandfillGREECE – Avlona/Malakasa, Attica (TS), 2011MacGrid T55 geocomposite used (49,000yd2) to stabilize the latest lift of vegetative soil having a 1 ft thickness on 25°-35°sloped finished surfaces.
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Piled Embankments
Sink Holes
Embankments on soft soil
FLAT APPLICATIONS
VERTICAL & SLOPED APPLICATIONS
Steep & shallow slopes
Drainage Applications
Hybrid structures
SOIL REINFORCEMENT APPLICATIONS
al embankment stability use:ARS
Slopes with cohesive soils
Soil veneer
SOFTWARE
MACSTARS
MACBARS
MACFLOW
ENSPAMac
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ENSPAMac
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THE FIRST CAPPING IN ITALY
OF A MINING LANDFILL
The Rigoloccio mine, located in Gavorrano (GR) in Tuscany
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Area with the steepest and longest slope
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Original solution:
Flat areas
• 0,50 m of vegetative soil;• drainage layer of 0,15 m thk;• smooth hdpe membrane (2 mm thk);• 0,40 m of clay;• waste.
Sloped areas
• 0,50 m of vegetative soil;• drainage composite (two geotextiles + net);• textured hdpe membrane (2 mm thick);• 0,40 m of clay;• waste.
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In the sloped area solution was modified due toevident soil veneer stability problems duringconstruction:
• Biomat blanket;• 0,30 m of vegetative soil;• TRM geocomposite to stabilize soil• drainage composite (two geotextiles + net);• textured hdpe membrane (2 mm thick);• 0,40 m of clay;• wastes.
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500 m2 on a total of 18.000 m2 job failed after heavy
rainfall
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Results of the back-analysis and on site investigations:
•The layer of vegetative soil was 30-40% thicker than the one designed;
• Friction angle reduced below the design value (set to 12º) occurredduring the time due to heavy rains.
• Presumably an increase in the soil weight due to the cohesivecomponent occurred.
•Failure of the mat occurred predominantly at the end of the additionalreinforcement confirming that collapse was due to a lack of mechanicalstrength and, in few other sections, at different points along the slope. Aback-analysis at the point of rupture confirmed the initial expectation.More difficult was to understand how failures occurred in the middle of themat (probably due to poor connection).
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0.83 onlyaltering h
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What did we learn?
• the textured membrane in this case was ineffective and not capable tostabilise the soil; a smooth membrane could be used instead, reducingthe costs;
• the interaction factors between the different geosynthetics are a keypoint; these values can vary in fact very much depending on the differentsituations;
• Thickness and “quality” of the soil placed on the reinforced mat arerelevant issues:
- The thickness (especially when small) is difficult to manage and it islikely to overload the geosynthetic;
- The weight and also the quality of the soil are not homogenous andthe characteristics are often different from those assumed. Changing thesoil weight and/or quality can also increase the loads.
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Conclusions:
• the design of an erosion system, like in this case, is a real structuralproject and the input data must be consistent with the real situation;
• the use of a textured membrane can be insufficient and ineffective,case to case;
• the reinforcement strength must be appropriate in the short-long termconditions in any operating situation (dry/wet);
• soil characteristics are important;
• installation operations are easy, but the design instructions must bestrictly followed (thickness layer!).
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• Maccaferri provides a range of products used in Capping Systems:• Paragrids and Paralinks for soil reinforcement with geogrids;• MacDrain for Drainage Geocomposites;• MacMat-R for soil erosion and reinforcement.
• Maccaferri provides design software and design service:• MacStars W for soil reinforced structures;• MacFlow for drainage design;• ENSPAMac for veneer soil cover design and anchor design
• Maccaferri provides informative design data sheets relevant to Capping:• MacDrain with RFcr for long term analysis allowing reduction in costs.
• Maccaferri provides 3 levels of service:• Level 1: Supply of products;• Level 2: Design and Supply;• Level 3: Quality Management Systems, Training, Site Assistance, PI
on Design.
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Moreno Scotto - Guaruja 2010
THANK YOUAny questions?
Ricardo SousaMSc. Civil Engineering (Aveiro, Portugal)
Area [email protected]