Geotechnical Presentation
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Transcript Geotechnical Presentation
OUTLINE
Definitions
Examples of Landfills in the Valley
Construction on Landfills
Materials Placement in Landfills
Developments on Landfills – why develop landfills ??
Concerns Associated with Development on Landfills
Landfill Materials Investigation
Remediation of Construction and Demolition (C&D) Landfills
Example Projects
DEFINITIONS
MSW Landfill
C&D Materials
Inert Debris Landfill
EXAMPLES OF LANDFILLS IN THE VALLEY
C&D Landfills
– Mostly Along the Salt River, Aqua Fria, Gila River &
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Santa Cruz River
Created Generally by Mining of Aggregates for Concrete,
Asphalt, and Base Course Materials
Pits Left Behind are Backfilled with MSW or C&D
24th St Vulcan Materials, 28th St ( Dean Thomas
Property), Salt River Pima Maricopa Dobson Plant
Tempe Market Place
EXAMPLES OF LANDFILLS IN THE VALLEY
MSW Landfills
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Queen Creek Landfill
27th Ave Landfill
Tempe Municipal Landfill
Northwest Regional Landfill, and Others
Inert Debris Landfills
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Salt River Materials Group Dobson Plant
28th Street Landfill
24th Street Landfill
Cotton Lane Landfill
Estrella Pit
MATERILAS PLACEMENT IN LANDFILLS
No Compaction During C&D Disposals
No Processing is Completed
Creates Nesting of Large Particles
Blind Spots around Odd Shaped Particles
Organics
MSW Decomposes, Develops Settlement, LFG &
Leachate
MATERILAS PLACEMENT IN LANDFILLS
DEVELOPMENTS ON THE LANDFILLS
Install Recreational Facilities
Low Load Bearing Structures on Compacted MSW,
e.g. Distribution Center
Heavier Structures on MSW should be on Deep
Foundations
Industrial and Commercial Developments on C&D
CONCERNS ASSOCIATED WITH LANDFILL
MATERIALS
Large Settlement
Uneven/Differential Settlements
Unpredictable – No Model Available on Stability
Compaction by Itself
Biodegradation
Piping, Internal Erosion and Raveling
Gas (LFG) and Leachate Production, Accumulation
& Contamination of Air and Ground Water
Organics in C&D Takes Too Long to Decompose
LANDFILL MATERIAL INVESTIGATION
SOLUTIONS TO PROBLEMS FOR C&D
LANDFILLS
Deep Dynamic Compaction (DDC) for Inert
Debris Landfills
Compaction Grout
Vibrofloatation (Not Common)
Remove and Reconstruct w/ Engineered
Fill/Debris
Deep Dynamic
Compaction (DDC)
Tempe Market Place
SOLUTIONS TO PROBLEMS FOR C&D
LANDFILLS
Deep Dynamic Compaction (DDC):
– Effective up to 30’-35’
– 30-ton Load Drop from 80-90 feet Height, Multiple
Times
– Imparts approx. 150 ton-ft/sq.ft. Equivalent to 150%
of Standard Proctor Compaction up to 25 Foot Depth
– Evaluate Performance
– Can’t Take Care of all Piping and Raveling
2000
4000
Deep Dynamic Compaction
24th Street and Salt River– Vibration Monitoring
Performance Evaluation
with Plate Load Test
Exam p le Pr o je ct , L o ad T e s t # 1
A ST M D 1194- 94
0.00
A verag e D ef o rm at io n , ( in ch ) .
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
0
50
100
L o ad , ( Kip s )
150
200
SOLUTIONS TO PROBLEMS FOR C&D
Debris Fill Specifications
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Anything as long as Inert Debris
2 to 3 feet Lift Thickness
Compaction with 10 to 15 ton Equipment
3 to 4 Passes with 20 to 30 hertz vibration
30 to 60 Gallons/Cu.Yd. Water
Debris Fill Specifications
EXAMPLE PROJECTS
Tempe Market Place
28th Street and Salt River
24th Street and Salt River
14th Street and River View Drive
Tempe Market Place – Before Development
Tempe Market Place – During Stabilization
Tempe Market Place – After Development
24th Street & Salt River
CONCLUDING REMARKS
Environmental Benefits
Aesthetic Improvement
Monetary Value Added
Land Use
Positive Economic Impact
Catalyst
Stops Illegal Dumping