-GEOSYNTEC CONStJL TANTS - EPA Archives · -GEOSYNTEC CONStJL TANTS ... foot thick layer of stone...
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Transcript of -GEOSYNTEC CONStJL TANTS - EPA Archives · -GEOSYNTEC CONStJL TANTS ... foot thick layer of stone...
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. -GEOSYNTEC CONStJL TANTS
...COMPUTATION COVER SHEET
Client: WM Project: King Geor,geXL ProjectlProposal #: MEO169 Task #: ~
TITLE OF COMPUTATIONS
COMPUTATIONS BY: ~ture IC/ ~(:L /. ;m.~""1..i_1 -~L 2..tI c.,'(-
DATE PrintedName Douglas T. Mandeville
andTitle Senior Staff Engineer
1j ~ ASSU:MPTIONS AND PROCEDURES. '" /;:;1 ~A. --!1-LI CHECKED BY:
(Peer Reviewer)
CO~UTATIONSCHECKEDBY:
COMPUTATIONS
BACKCHECKED BY:
(Originator)
P~P~ROVE~BY:(PI\.:;.or DesIgnate)
APPROVAL NOTES:
SignatureI_/U!A ~/;}fh,<./
'DAT PrintedName William M. Steier andTitle
Signature!
PrintedName andTitle
Signature
PrintedName andTitle
Signature~
PrintedName
andTitle
Assistant r ~ectEngineer.
...'?/.z~/(/I;
William M. Steier As2istant Project Engineer
( i 't '-.11..
}\ "I aJl.,j { ( 1l1~~vJL
DOUglasT. Mandeville ~
Senior Staff Engineer
1y&J..tJ!J~
Michael F. Houlihan, P.E.
Principal
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--MEOI69/KGCSLOPSTAB.DOC
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c, --...~~ GEOSYNTEC CONSULTANTS Pa
Written by: Doug Mandeville Date: 2/22/01 Reviewedby: Bill SteierL 1';/1/ Date: -~~:~~~~
Client: WM Project: King George XL Proj./ProposaI No.: MEO 169 Task No.: 05
-.
SLOPE STABILITY OF BIOREACTOR AREA
PTJ'RPOSE
The purpose of this calculation is to evaluatethe slope stability of the bioreactor configuration of the King George landfill. This bioreactor program is being operated under the EPA's XL program. For the landfill to operateasa bioreactor, a significant amountof water needsto be added to the waste mass. This water will be addedthrough the use of gravity fed trenches. The addition of water to the wastemassmay increasethe weight of the massas well as the pore pressuresin th~e waste mass. This calculation examines the stability of the existing slope with the addition of the water.
The slope stability analysis is performed to verify that the idealized configuration has an adequate factor of safety against failure under static and pseudo-static loading conditions. According to technical manual published by the USEPA entitled "Solid Waste Disposal Facility Criteria" [USEPA, 1993], the minimum recommended factor of safety against slope stability failure for permanent conditions is 1.5. The current standard of practice when examining pseudo-static conditions is to evaluate the displacement along the slip surface; a displacementof less than 1 foot is consideredto be satisfactory [USEPA, 1995 and Seedand Bonaparte, 1992].
SELECTION OF CRITICAL CROSS SECTION
Figure 1 shows the area in which liquid will be added to the landfill. In examining this Figure, a potential critical section exists at each of the outward facing slopes. The east, south, and west facing slopes have a perimeter berm located at the limit of waste. The north facing slope is not buttressed by a perimeter berm or adjacentwaste cells and is therefore selectedasthe critical cross section. Figure 2 is an idealized representationof the critical cross section.
The liquid application trenches to be used in the bioreactor operations are modelled as a 4 foot thick layer of stone with a phreatic surface located at the top of the liquid application trench. The phreatic surface is assumedto have sideslopes of 1 horizontal to 1 vertical; the waste located under and adjacent to the liquid application trench is influenced by this phreatic surface. The liquid application trench will be located at least 50 feet from any outward facing slopes and will be located at least 2 feet under the surface of the landfill.
MEO 169/KGCSLOPST AB.DOC
..=-..~~- GEOSYNTEC CONSULTANTS Page 2 of 2.0
Writtenby: DougMandeville Date: 2/22/01 Reviewedby: Bill Steier~,.,r1/'../ Date: "3
Client: wM Project: King GeorgeXL Proj./ProposalNo.: MEO169 TaskNo.: 05
METHODS OF ANALYSES
The factor of safety of the typical cross section is analyzed using limit equilibrium theory along with the methods of slices. The computer program XSTABL [Sharma, 1996] was used to perform the analysis. The procedureconsistedof analyzing numerouspotential failure surfacesto find the critic'}l failure surface that results in the minimum factor of safety for the slope.
For this analysis, a circular slip surface is evaluated using Bishop's method. In this analysis, the slip surface is allowed to pass through the underlying soil. A simplified seismic loading analyses(i.e. pseudo-staticslope stability analysis) is also performed for tlie same cross section. The pseudo-staticanalysis method assumesthat the entire soil mass is subjectedto the maximum horizontal acceleration (MHA) for the site and assumes that there are no soil amplification effects (the MHA in the bedrock is the sameas the MHA in the landfill foundation soil). The MHA is defined as the accelerationwith a 90 percentprobability of not being exceeded in 250 years. The MHA in bedrock for the King Georgesite is estimatedto be 0.15 g, as indicated in Figure 3 [Algermissen et. al., 1990].
MATERIAL PROPERTIES AND ASSUMPTIONS
The soil material and interface properties used in the slope stability analysis are summarized in the Table 1. The soil properties are identical to those described in the Part B permit application [Rust, 1994]. The waste properties are based on bi-linear failure envelope [Kavazanjian et aI, 1995]. In this failure envelope, the waste has a cohesion value of 500 psf up to a normal stressof770 psf, above a normal stressof 770 psf, the waste has a friction angle of 33°.
Table 1. Material ro erties used in liner slo e stabili anal ses. Unit Cohesion Friction
Material Wei ht(lb/W ( s Anole
Cover soil 125 250 25° Waste (I) 75 500 330 Liner interface (2) 100 0 180
Foundation soil 125 250 250 Trench Gravel 120 0 300 Water 62.4 NA NA (1)bi-linear failure envelopebasedonKavazanjianet al1995 (2) thesepropertiesareusedto representthe liner systemin this analysis.
MEO 169/KGCSLOPST AB.DOC
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--.~~ -GEOSYNTEC CONSULTANTS Page 3 of '2D
Writtenby: Doug Mandeville Date:. 2/22/0I Reviewedby: Bill Steiert:.v/ Date:-.rik
Client: WM Project: King GeorgeXL Proj./ProposalNo.: MEO169 TaskNo.: 05
RESULTS OF ANALYSES
Slope stability analyseswere performed for the cross section shown in Figure 2. Table 2 provides a summary of the factors of safety that were obtained in this analysis.
Table 2 -Results of liner stability analyses
Factor of Safetv Factor of Safe
Static Analysis (filename) Pseudo-StaticAnalysis
Existin conditions 1.53 kg2ex)
With liquid application 1.53 (kg2tr) 1.14 [0 inches] (kg2treq) trench
Based on the static analysis conducted for the slopes, the factor of safety obtained during the static analyses was greater than the minimum value of 1.5. The addition of the liquid application trench and the phreatic surface associatedwith the addition of water into the trench does not changethe location of the critical surface; the factor of safety remains the sameas in the existing conditions analysis.
The displacement along the slip surface of the landfill is estimated for the critical pseudo-static casepresented above. A maximum horizontal acceleration of 0.15g resulted in a factor of safety of 1.14. This is greaterthan a factor of safety of 1, therefore no displacement is expected to occur along the slip surface of the landfill. The recommended maximum displacement along the slip surface is 12 inches,.therefore,the landfill-design is satisfactory.
MEO169/KGCSLOPSTAB.DOC
-._la_- GEOS~TEC.~9'NS.tFLT~S Page 4 of 20
Writtenby: Doug Mandeville Date: 2/22/0..1 Reviewedby: Bill Steier~ Date: _2~_:[~~
Client: VIM Project: King GeorgeXL Proj.,'ProposalNo.: MEOl69 TaskNo.: 05
.
REFERENCES
Algel11lissen,S., Perkins, D., Thenhaus,P., Hanson, S., and-Bender,B., "Probabilistic Earthquake Acceleration and Velocity Mapsfor the u"nitedStatesalidPuerto Rico", U.S. Geological Survey, MiscellaneousField Studies Map MF-2120, 1990.'
Kavazanjian Jr., E., Matasovic, N., Bonaparte,'R.,and Schrnertrnann,G., "Evaluation ofMSW Properties for Seismic Analysis", Proceedings, Geoenvironment2000, Vol II, New Orleans,LA, Feb 1995,pp. 1126-1141.
Rust, Part BPel11lit Application folKingBensalem, Pennsylvania, August 1994. -,
George County Landfill and Recycling Center, .
Seed,R.B., and Bonaparte, R., '"Seismic"AnalYsis'andDesign of Lined WasteFills: Current Practice," Proc. Stability and Pedol11lanceof Slopes and Embankments -II, Vol. 2, ASCE Geotechnical Special Publication No. 31, Berkeley, California, pp. 1521-1545.
Sharma, S. "XSTABL: an integrated,Slope Stability Program for PersonalComputers", Version 5.201, Interactive Software Designs, Inc., Moscow, ID, 1996.
United StatesEnvironmental Protection Agency; ",Solid Waste Disposal Facility Criteria", Document No. EPA 530-R-93~017;November 1993.
United StatesEnvironmental ProtectionAgency, "RCRA Subtitle D (258) SeismicDesign Guidance for Municipal Solid WasteLandfill Facilities," April 1995.
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Client: WM Project: Kine GeorgeXL Proj.,/ProposalNo.: MEQ169 TaskNo.: 05-~
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