00471838

Component

http://onlinepubs.trb.org...trr/1986/1089/1089-011.pdf

https://scholar.google.co...rger&publication_year=1986

The use of dynamic compaction to increase bearing capacity and reduce settlement of loose foundation soils at great depths is becoming more widespread in the United States. The use of dynamic compaction on a recent Interstate highway overlay project in Montana is described. Foundation soils treated were about 20 to 25 ft (6.1 to 7.6 m) of loose dry alluvial sands and silts having low N-values (blows per foot) by the standard penetration test (less than 4 in some cases). Correlation has beed found between known and suspected deposits of hydrocompactible soils and semiarid areas having less than about 12 in. (30 cm) of precipitation a year in Montana. A 15-ton (13.6-metric ton), 6-ft (1.8-m) diameter weight with a drop height of 60 ft (18.3 m) was used for the dynamic compaction process. The compaction was performed even in the winter months through frost layers broken up by ripping equipment. Dynamic compaction was found to be a very cost-effective method for improving deep deposits of loose sand and silt. Cost savings from this methd of compaction compared with feasible alternatives was estimated at $2.6 million. The average increase in N-value of the loose materials following compaction was 5 to 12. Some complaints of structural damage were received from local citizens even though the closest residence was 170 ft (52 m) from the compacted area.

Publication of this paper sponsored by Committee on Engineering Geology.Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01418818

pp 75-80

1986

Transportation Research Record

0309041090

Print

Figures (5) ; Maps (2) ; References (7) ; Tables (2)

Alluvium; Compaction; Foundation soils; Loose soils; Sand; Silts

Interstate Highway System

Whitehall-Cardwell (Montana)

Whitehall-Cardwell (Montana)

Geotechnology; Highways; I42: Soil Mechanics

TRIS, TRB

Jul 31 1988 12:00AM

• ANALYSIS OF SLOPE FAILURE IN OVERCONSOLIDATED FISSURED RESIDUAL SOILS: A CASE STUDY
• COMPRESSIBILITY OF COMPACTED FILLS EVALUATED BY THE DILATOMETER
• CONSTRUCTION METHODS TO CONTROL EXPANSIVE SOILS IN SOUTH DAKOTA
• CONTROL OF FROST PENETRATION IN ROAD SHOULDERS WITH INSULATION BOARDS
• DEFORMATION ANALYSES OF FLORIDA HIGHWAY SUBGRADE SAND SUBJECTED TO REPEATED LOAD TRIAXIAL TESTS
• DETERMINATION OF THE CRITICAL THAW-WEAKENED PERIOD IN ASPHALT PAVEMENT STRUCTURES
• DRAINED-STRENGTH PARAMETERS FROM DIRECT SHEAR TESTS FOR SLOPE STABILITY ANALYSES IN OVERCONSOLIDATED FISSURED RESIDUAL SOILS
• EXPERIMENTAL ASPECTS OF MERCURY INTRUSION POROSIMETRY
• FACTORS IMPORTANT TO THE DEVELOPMENT OF FROST HEAVE SUSCEPTIBILITY CRITERIA FOR COARSE-GRAINED SOILS
• FLEXURAL FATIGUE STRENGTH OF LIME-LATERITE SOIL MIXTURES
• FROST ACTION PREDICTIVE TECHNIQUES: AN OVERVIEW OF RESEARCH RESULTS
• GENESIS AND DISTRIBUTION OF COLLUVIUM IN BUFFALO CREEK AREA, MARION COUNTY, WEST VIRGINIA
• LOCATING SUBSURFACE GRAVEL WITH THERMAL IMAGERY: PRELIMINARY RESULTS
• MEASUREMENT OF PORE-SIZE DENSITY FUNCTION IN SAND
• PERFORMANCE OF CEMENT-MODIFIED SOILS: A FOLLOW-UP REPORT
• PHYSICAL PROPERTIES OF SOUTHEASTERN WASHINGTON LOESS RELATED TO CUT SLOPE DESIGN
• SATURATION EFFECTS ON CALCAREOUS DESERT SANDS
• THE PRESSUREMETER IN GEOTECHNICAL PRACTICE
• THE SHERMAN LANDSLIDE: A CASE HISTORY
• USE OF ROTATIONAL EROSION DEVICE ON COHESIVE SOILS