American Society of Civil Engineers


Undisturbed Sampling of Saturated Sands by Freezing


by Sukhmander Singh, M.ASCE, (Sr. Engr. and Assoc., Dames & Moore, San Francisco, Calif.), H. Bolton Seed, F.ASCE, (Prof. of Civ. Engrg., Univ. of California, Berkeley, Calif.), and Clarence K. Chan, M.ASCE, (Research Engr., Dept. of Civ. Engrg., Univ. of California, Berkeley, Calif.)

Journal of the Geotechnical Engineering Division, Vol. 108, No. 2, February 1982, pp. 247-264

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Document type: Journal Paper
Discussion: by T.J. Pilecki    (See full record)
Abstract: From considerations of the basic mechanisms of soil behavior during freezing, it is suggested that undisturbed samples can only be obtained by undirectional freezing with no impedance of drainage while the confining pressure is maintained. Experimental data illustrate that this method can lead to laboratory samples which maintain their in situ characteristics. Care is required to ensure the effectiveness of the method and it is noted that variables such as the coolant temperature, the percentage of fines in the sand and the depth of sampling can influence the efficiency and effectiveness of the method. It is shown that the beneficial effects of freezing samples by surrounding the sampling tube with dry ice prior to shipping can only be achieved if the samples are drained prior to freezing. If a sample contains a large percentage of fines, insufficient drainage may cause all-around freezing to have deleterious effects on the quality of the sample.


ASCE Subject Headings:
Frozen soils
Sampling
Sand (soil type)
Saturated soils
Soil tests