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<p>This manuscript develops the unloading of K<sub>0</sub> oedometer and triaxial tests to obtain analytical formulation for the best fit of horizontal stresses on the unloading geotechnical structures. A database of 59 samples of experimental curves (vertical vs. lateral stress) from soils collected using triaxial apparatus or oedometer is analysed. The curves show the diversity of mechanical responses of soils of different types and the value of measuring the radial stress during unloading, which is very different from that during loading. Sands and clays with low plastics provide standard responses where the slope <i>K</i><sub>0</sub><sup>NC</sup> is to be compared with the compressibility index during the work hardening of a soil in its “normally consolidated” states. In unloading, the stress hysteresis reflects the effect of the overconsolidation (<i>K</i><sub>0</sub><sup>OC</sup>) of the soil and its progression to a state of failure in extension, with a lateral stress of zero in full unloading in the case of sands and greater than zero in the case of clays. The formulation of <i>K</i><sub>0</sub><sup>OC</sup> in unloading implemented in the advanced soil behaviour models of the PLAXIS code (2020) gives approximately two straight lines with an abrupt bend between, while all our samples show a relatively smooth curve.</p>

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Improvement Determination of Coefficient of Earth Pressure at-Rest in Unloading Oedometric and Triaxial Tests to Compute Very High Lateral Stress History of the Soils

  • 期刊论文

  • 发表日期：

    2025年3月31日

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  • Zoa Ambassa,
  • Jean Chills Amba

摘要

This manuscript develops the unloading of K0 oedometer and triaxial tests to obtain analytical formulation for the best fit of horizontal stresses on the unloading geotechnical structures. A database of 59 samples of experimental curves (vertical vs. lateral stress) from soils collected using triaxial apparatus or oedometer is analysed. The curves show the diversity of mechanical responses of soils of different types and the value of measuring the radial stress during unloading, which is very different from that during loading. Sands and clays with low plastics provide standard responses where the slope K0NC is to be compared with the compressibility index during the work hardening of a soil in its “normally consolidated” states. In unloading, the stress hysteresis reflects the effect of the overconsolidation (K0OC) of the soil and its progression to a state of failure in extension, with a lateral stress of zero in full unloading in the case of sands and greater than zero in the case of clays. The formulation of K0OC in unloading implemented in the advanced soil behaviour models of the PLAXIS code (2020) gives approximately two straight lines with an abrupt bend between, while all our samples show a relatively smooth curve.