Accession Number : ADA292909

Title :   Impact Behavior of the Active Zone within a Frozen Soil Profile.

Descriptive Note : Final rept. Sep 90-Aug 94,

Corporate Author : TEXAS UNIV AT EL PASO CENTER FOR GEOTECHNICAL AND HIGHWAY MATERIALS RESEARCH

Personal Author(s) : Picornell, Niguel ; Nazarian, Soheil

PDF Url : ADA292909

Report Date : FEB 1995

Pagination or Media Count : 148

Abstract : The report describes a lab experiment with a pavement profile subject to a freeze/thaw cycle. The 5 x 5 x 5 ft lab specimen was instrumented with thermocouples, resistivity sensors, and 48 embedded geophones. The records of these sensors were used to delineate the progress of a freezing front through the soil profile and to implement a tomographic survey. At selected intervals, a 550-lb impulse, lasting 15 milliseconds, was imparted on a circular plate placed on the surficial asphalt layer, and the records at all geophone locations were recorded. The surface deflection bowl was used to backcalculate the moduli of all pavement layers present using a computer code: WESDEF. Then, the two sets of moduli from WESDEF and those found from the tomographic survey were used to predict the deflections at all geophone locations. The report describes the comparison of the measured with the predicted deflections to evaluate the capabilities of the backcalculation procedure in the presence of frozen and thawed soil layers. (MM)

Descriptors :   *PAVEMENTS, *FROZEN SOILS, *SOIL STRUCTURE INTERACTIONS, STRESS STRAIN RELATIONS, TEMPERATURE, LOAD DISTRIBUTION, DEFLECTION, THESES, ASPHALT, SUBGRADES, ICE FORMATION, DEPTH, IMPACT STRENGTH, SEISMIC DATA, FREEZING, GROUND VEHICLES, THAWING, TOMOGRAPHY, SEISMIC VELOCITY, THERMOCOUPLES, GEOTECHNICAL ENGINEERING, FROST HEAVE, PERMAFROST, GEOPHONES.

Subject Categories : Soil Mechanics
      Snow, Ice and Permafrost
      Civil Engineering
      Seismology

Distribution Statement : APPROVED FOR PUBLIC RELEASE