00743605

Component

https://doi.org/10.3141/1596-14

http://scholar.google.com...ders&publication_year=1997

The use of prefabricated vertical drains (PVDs) under vacuum conditions for soil flushing was investigated with soils consisting of 100% sand or a combination of 80% sand and 20% kaolinite. Tests of the 100% sand specimens indicated that the areal extent of the PVD zone of influence remained approximately 16 to 21 times the PVD-equivalent diameter (PVD circumference/pi) as the extraction vacuum increased from 2.5 to 20 kPa. Tests of the sand kaolinite specimens (80/20 soil) indicated that the areal extent of the PVD zone of influence remained approximately 5 to 8 times the PVD equivalent diameter as the extraction vacuum increased from 2.5 to 20 kPa. The effective zone of influence in the 80/20 soil did not show a corresponding increase in areal extent as the vacuum pressure was increased beyond the PVD embedment depth. Pilot-scale tracer flushing tests demonstrated the feasibility of using PVDs for flushing 100% sand soil. The tracer testing demonstrated that longer flushing times were necessary to achieve 80% cleanup levels as the dry unit weights of soil increased from 1.57 to 1.67 g/cc. The ratio of final to initial concentration reached 0.2 after flushing of the 1.57 g/cc soil for approximately 40 minutes. A similar ratio was reached after flushing of the 1.67 g/cc soil for 50 minutes.

This paper appears in Transportation Research Record No. 1596, Pavements and Structures Monitoring, Pavement Instrumentation, and Drainage Systems Evaluation.

English

p. 93-100

1997

Transportation Research Record

0309061733

Figures (7) ; References (2) ; Tables (2)

Flushing; Kaolinite; Prefabricated structures; Sand; Soils; Vertical drains

Geotechnology; Highways; Maintenance and Preservation; I42: Soil Mechanics

TRIS, TRB, ATRI

Dec 9 1997 12:00AM

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• EVALUATION OF DYNAMIC EARTH PRESSURE CELLS FOR SUBGRADE
• INSTRUMENTATION OF A GEOSYNTHETIC-REINFORCED FLEXIBLE PAVEMENT SYSTEM
• INSTRUMENTING OHIO TEST PAVEMENT
• MEASUREMENT OF STRESS AND STRAIN IN AN UNSURFACED HAUL ROAD AT A SOFT CLAY SITE IN SCOTLAND
• NEW FABRY-PEROT FIBER-OPTIC SENSORS FOR STRUCTURAL AND GEOTECHNICAL MONITORING APPLICATIONS
• PERFORMANCE PROBLEMS OF OPEN-GRADED DRAINAGE LAYERS UNDER CONTINUOUSLY REINFORCED CONCRETE PAVEMENTS IN ILLINOIS
• PROPOSED EVALUATION OF BASE MATERIALS FOR DRAINABILITY
• ROLE OF DEICING SALT IN PAVEMENT DETERIORATION BY FROST ACTION
• SOIL SUCTION DISPERSION AND STATISTICAL ANALYSIS WITH DEPTH AT THE MEDFORD AIRPORT
• SUBSURFACE DRAINAGE SYSTEMS IN ROADWAY CONSTRUCTION
• SUCTION MEASUREMENTS ON A SASKATCHEWAN SOIL USING A DIRECT-MEASUREMENT, HIGH-RANGE SUCTION SENSOR
• THREE-DIMENSIONAL STRUCTURAL STRAIN MEASUREMENT WITH THE USE OF FIBER-OPTIC SENSORS