Laboratory velocities and attenuation of p-waves in limestones during freeze-thaw cycles

Journal Article · Tue Feb 01 04:00:00 EST 1994 · Geophysics; (United States)

DOI:https://doi.org/10.1190/1.1443586· OSTI ID:7112762

Remy, J M; Bellanger, M; Homand-Etienne, F ^[1]

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1. Lab. de Geomecanique de Nancy, Vandoeuvre-les-Nancy (France)

The velocity and the attenuation of compressional P-waves, measured in the laboratory at ultrasonic frequencies during a series of freezing and thawing cycles, are used as a method for predicting frost damage in a bedded limestone. Pulse transmission and spectral ratio techniques are used to determine the P-wave velocities and the attenuation values relative to an aluminum reference samples with very low attenuation. Limestone samples were water saturated under vacuum conditions, jacketed with rubber sleeves, and immersed in an antifreeze bath (50 percent methanol solution). They were submitted to repeated 24-hour freezing and thawing cycles simulating natural environment conditions. During the freeze/thaw cycles, P-wave velocities and quality factor Q diminished rapidly in thawed rock samples, indicating modification of the pore space. Measurements of crack porosity were conducted by hydrostatic compression tests on cubic rock samples that had been submitted to these freeze/thaw cycles. These measurements are used as an index of crack formation. The hydrostatic compression tests confirmed the phases of rock damage that were shown by changes in the value of Q. Furthermore, comparison between Q values and crack porosity demonstrate that the variations of P-wave attenuation are caused by the creation of new cracks and not by the enlargement of pre-existing cracks.

• OSTI ID: 7112762
• Journal Information: Geophysics; (United States), Journal Name: Geophysics; (United States) Vol. 59:2; ISSN GPYSA7; ISSN 0016-8033
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580000* -- Geosciences
ATTENUATION
BENCH-SCALE EXPERIMENTS
CARBONATE ROCKS
CRACK PROPAGATION
DATA ANALYSIS
GEOLOGIC FRACTURES
GEOLOGIC STRUCTURES
LIMESTONE
ROCKS
SEDIMENTARY ROCKS
SEISMIC P WAVES
SEISMIC WAVES
WAVE PROPAGATION
WEATHERING