Geomechanics and Engineering

Techno-Press (테크노프레스)
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Measurement of K0 and K'0 during loading and unloading of loose sand

  • Shay, Nachum (Faculty of Civil & Environmental Engineering, Technion-Israel Institute of Technology) ;
  • Mark, Talesnick (Faculty of Civil & Environmental Engineering, Technion-Israel Institute of Technology) ;
  • Sam, Frydman (Faculty of Civil & Environmental Engineering, Technion-Israel Institute of Technology)
  • Received : 2022.01.05
  • Accepted : 2022.12.24
  • Published : 2023.01.10
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Abstract

The coefficient of lateral earth pressure at rest in loose sand during virgin loading, K0 , and during unloading, K'0 , have been determined from laterally confined load-unload tests. The tests included measurement of lateral pressure with null pressure gauges, side wall friction with newly designed friction meters and applied pressure and base pressure with load cells. The importance of accounting for side-wall friction when evaluating the distribution of vertical pressure over the height of the soil specimen was demonstrated. Relatively uniform friction was observed during loading, but this was not the case during unloading unless friction reduction measures were employed. While the measured value of K0 was found to be close to, if slightly higher than the value commonly estimated on the basis of friction angle, φ', the ratio of K'0 to K0 was found to reasonably fit an expression of the form K'0/K0 = 1 + C·log(OCR), with C equal to 1 in the present tests.

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References

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