geogrid slope case study case
TRANSCRIPT
8/8/2019 Geogrid Slope Case Study Case
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CASE HISTORY Ref: UK / TR / CH / SR028 - Rev: 01, July 08
SLOPE REINFORCEMENT IN LANDFILLS
Product: Paragrid 100/05 & 50/05, Paralink 700, 500 & 400, Terram 1B, MaclineGCL NL10, Terram 1000 & 4500, 2mm Macline SHE
AYDIN UNCONTROLLED DISPOSAL SITE
AYDIN, TURKEY
ProblemAs part of the design of the new controlled disposal sitein the Municipality of Aydin (in southern Turkey, nearthe ancient ruins of Ephesus) it was necessary todesign - in addition to the bottom barrier system of thedisposal site itself - two structures which acted ascontainment dams for the first and second cells. Thegorge had to be divided into two independent cells; thefirst cell was constructed at the same time as theformation of the containment structures whilst the
second cell will be waterproofed as soon as the firstone has been completed and made safe. The cells arevery deep so it has been necessary to build a series ofaccess roads within the disposal site and forconnection to the town of Aydin.
SolutionThe solution developed by the designers has beenbased on the techniques and construction practiceswhich have been in use for some time in Europe withregard to the barrier system package and considerableuse has been made of geogrids for the formation of thecontainment structures for the two cells and for the
embankments forming the site roads. The adoption ofvarious strengths of geogrids has enabled use of thesoil present on site and the grading of slopes toinconceivable angles for a loose material, therebyachieving considerable reductions, both in terms ofcosts and material volumes. The bottom barrier systemuses a 2 mm HDPE membrane (Macline SHE) restingon a layer of low permeability clay covered by ageotextile protection layer (Terram 4500), used incombination with a bed of sand and a mineral drainagelayer in which a mesh of drainage pipes has beenincorporated. The clay layer has been replaced on thesteep slopes by a bentonite geocomposite laminate
(Macline GCL NL10), whilst a geogrid-geotextile non-woven geocomposite (Terram 1B) has been used to
Paragrid 100/5 110,000m2, Paragrid 50/05 5,000 m2, Paralink 700
5,000m2, Paralink 500 5,000 m2, Paralink 400 32,000m2, MaclineGCL N10 44,000m2, Terram 1B 30,000m2, Terram 1000 26,000 m2,Terram 4500 10,500m2, 2mm Macline SHE 45,000m2
Construction date:
Designer:
Products used:
November 2006 — April 2007
SERDAR Engineering (Ankara)
Client name:
MUNICPALITY OF AYDIN
Main contractor name:
CENGI CONSTRUCTION SpP (Ankara)
During construction Date: November 2006
Project layout — reinforced earth works shown in brown
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During construction (future cell containment wall) After construction (future cell 2 containment wall)
After construction (cell 1)
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Date: November 2006
Typical design section — highest section
The stability of the structures (both
internally and globally) has been checkedusing specific software called MACSTARS(Maccaferri Stability Analysis ReinforcedSlopes). This enables the use of differenttypes of reinforcement elements (syntheticand metal), with different mechanicalstrengths and with any geometricalconfiguration, thereby simulating thevarious types of external loads applied tothe structure (point loads and distributedforces, seismic forces, etc.).The diagramalongside shows the output for the externalstability checks carried out for a section ofthe embankments, in which the slip circlesare highlighted with different coloursdepending on the safety factor. Thisdiagram enables a fast visualisation of thecritical slip surfaces and becomes apowerful and effective tool for design andcontrol.
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Post construction, North bound off-slip
Maccaferri Ltd - Head Office7600 The Quorum,Oxford Business Park, North,
Garsington Road, Oxford, OX4 2JZTel: 01865 770555Fax: 01865 774550Email: [email protected]
Web: www.maccaferri.co.uk
Area officesPerth:T: 01738 621317 F: 01738 442283 E: [email protected]
Belfast:T: 028 9026 2830 F: 028 9026 2849 E: [email protected] Dublin:T: 01 885 1662 F: 01 885 1601 E: [email protected]
Web: www.maccaferri.ie Oxford, Perth, Belfast
Spring 2007 — Installation of bottom barrier system
Puncture-resistant drainage geocomposite Terram B1
Granular drainage material
Non-woven geotextileTerram 4500 with sand
1m clay layer2mm HDPE geomembrane Macline SHEBentonite geocomposite laminate Macline GCL NL 10