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Experimental study of lateral restraint effects on the potential heave of expansive soils

机译：横向约束对膨胀土潜在升沉影响的试验研究

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摘要

This paper investigates the capability of swell parameters, obtained under oedometer and triaxial loading conditions, to accurately predict the potential heave of expansive soils. The applicability of the oedometer and triaxial swell data was examined using the results of an instrumented field experimental station. The field behaviour was predicted using pressure, suction, and moisture heave prediction methods. When the results of the oedometer tests were used in the calculations, all three techniques markedly overestimated the field heave measurements. Contrarily, using triaxial swell parameters gave a satisfactory agreement between observed and predicted heave values. Comparison of oedometer and triaxial results, corroborated by back calculations of the field data, clearly indicates that the mismatch of observed heaves and predictions based on the oedometer data was primarily attributed to the fully lateral restraint conditions applied in the oedometer swell tests. Applying a correction factor to the heave estimated based on oedometer data, a reasonable agreement was achieved between the estimated heave and field measurements The value of the correction factor was found to be dependent on the method of prediction. However, an overall average value in the order of one-third is considered not unreasonable for the three heave prediction methods considered in this study. This factor converts the volume change obtained from the oedometer data to a vertical heave, and it also accounts for the discrepancy between field and oedometer soaking conditions.
机译：本文研究了在里程表和三轴载荷条件下获得的膨胀参数准确预测膨胀土的潜在升沉的能力。使用仪器现场实验站的结果检查了里程表和三轴膨胀数据的适用性。使用压力，吸力和湿度升沉预测方法预测了现场行为。当将里程表测试的结果用于计算时，所有这三种技术都明显高估了现场起伏测量值。相反，使用三轴膨胀参数在观测到的和预测的升沉值之间给出了令人满意的一致性。里程表结果与三轴结果的比较（通过现场数据的反算得到了证实）清楚地表明，观测到的隆起和基于里程表数据的预测的不匹配主要归因于里程表膨胀试验中使用的完全横向约束条件。将校正因子应用于根据里程表数据估算的升沉，在估算的升沉和野外测量之间达成合理的一致。发现校正因子的值取决于预测方法。但是，对于本研究中考虑的三种升沉预测方法，总平均值的三分之一被认为是合理的。该因子将从里程表数据获得的体积变化转换为垂直升沉，并且还说明了田间和里程表浸泡条件之间的差异。

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