00238083

Component

http://onlinepubs.trb.org...s/hrr/1972/393/393-008.pdf

A FROZEN SAND--ICE LAYER, WHEN SUBJECTED TO LATERAL PRESSURE AT A CONSTANT TEMPERATURE SHOWS REDUCTION IN STRESS WITH TIME. INVESTIGATIONS WERE CARRIED OUT TO STUDY THE GENERAL TENDENCY OF THIS REDUCTION IN LATERAL STRESS AND ALSO TO INVESTIGATE THE EFFECTS OF CERTAIN PARAMETERS INFLUENCING THIS BEHAVIOR. TWO DIFFERENT TYPES OF SAND WERE USED TO PREPARE THE SAND--ICE SPECIMENS WITH A VAREITY OF INITIAL POROSITY AND DEGREE OF ICE SATURATION. THEY WERE TESTED AT VARIOUS CONSTANT TEMPERATURE UNDER SELECTED INITIAL PRESSURES. THE MAGNITUDE OF PRESSURE RETAINED BY A FROZEN SAND SAMPLE AT ANY TIME, AFTER COMMENCEMENT OF THE EXPERIMENT, WAS MEASURED BY MEANS OF A PRESSURE GAUGE ATTACHED TO THE "PRESSURE UNIT." THE REDUCTION IN LATERAL STRESS, EXPRESSED AS A PERCENTAGE OF INITIAL PRESSURE APPLIED TO A FROZEN SAND LAYER, WAS STUDIED AS A FUNCTION OF FIVE VARIABLES: INITIAL PRESSURE, THE INITIAL POROSITY OF THE SAND, THE DEGREE OF ICE SATURATION, TEMPERATURE OF SAMPLE, AND TIME ELAPSED AFTER THE APPLICATION OF INITIAL PRESSURE. EXPERIMENTAL RESULTS WERE PLOTTED IN THE FORM OF PRESSURE--TIME CURVES TO STUDY THE TIME-DEPENDENT BEHAVIOR OF THE SAND--ICE SYSTEM UNDER APPLIED LOAD. ALSO, REDUCTION IN STRESS WAS PLOTTED AGAINST EACH OF THE PREVIOUSLY MENTIONED VARIABLES TO SHOW THEIR INFLUENCE ON THE REDUCTION IN LATERAL STRESS. A GENERAL EQUATION TO PREDICT THE VALUE OF LATERAL PRESSURE RETAINED BY THE SAND--ICE LAYER AT ANY TIME AFTER THE APPLICATION OF A KNOWN INITIAL PRESSURE WAS DERIVED EMPIRICALLY IN TERMS OF THE FIVE VARIABLES.

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00041223

pp 79-87

1972

Highway Research Record

51st Annual Meeting of the Highway Research Board

Print

Figures (13) ; References (4)

Earth pressure; Frozen soils; Granular soils; Ice; Mechanical relaxation; Porosity; Sand; Time dependence

Lateral stress

Geotechnology; Highways

TRIS, TRB

Feb 23 1973 12:00AM

• CHEMICAL ADDITIVES TO REDUCE FROST HEAVE AND WATER ACCUMULATION IN SOILS, WITH DISCUSSION AND CLOSURE
• FREEZING AND HEAVING OF SATURATED AND UNSATURATED SOILS
• FROST AND SORPTION EFFECTS IN ARGILLACEOUS ROCKS
• FROST HEAVING VERSUS DEPTH TO WATER TABLE
• INFLUENCE OF FREEZING RATE ON FROST HEAVING
• PREDICTING UNFROZEN WATER CONTENTS IN FROZEN SOILS FROM SURFACE AREA MEASUREMENTS
• USE OF THE ICE-WATER SURFACE TENSION CONCEPT IN ENGINEERING PRACTICE