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Title: X-ray photography method for experimental studies of the frozen fringe characteristics of freezing soil
Authors: Shimizu Construction Company.
Akagawa, Satoshi.
Keywords: Frost heave
Frost heaving
Frost action
Frozen soils
X-ray photography
Publisher: Cold Regions Research and Engineering Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Special report (Cold Regions Research and Engineering Laboratory (U.S.)) ; 90-5.
Description: Special Report
Abstract: The objectives of this report are to demonstrate a useful method for observing frost heave in freezing soil and to evaluate the method for the study of frozen fringe characteristics. X-ray photography of lead spheres containing thermocouples was tested in conjunction with frost heave tests. By applying image processing techniques for determining the coordinates of the spheres, it is possible to obtain precise temperature profiles and determine the deformation in freezing soil. Strain and strain rate data calculated from the coordinates of the lead spheres and the temperature profiles show when, where and how much deformation (heaving and consolidation) has taken place in the freezing soil. The temperature and strain field around the frozen fringe were also observed. However, the method of determining the frozen fringe location from the location of the warmest ice lens was found to be questionable, because the active heaving zone was found to be located between the warmest visible ice lens and the 0°C isotherm. This was especially true during transient heaving, which occurs while the 0°C isotherm penetrates into the unfrozen soil. For studying the precise deformation characteris tics of the frozen fringe, further precise analysis of the X-ray photo's intensity profile vvill be needed to convert it to a strain profile. The accuracy and spacing of the temperature sensors do not seem to be adequate for temperature measurements in the frozen fringe, and there is a need for measurement methods that are more accurate than conventional temperature sensors.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Special Report

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