Abstract In this paper, a rational method for estimating the unit weight of cement-treated clay is proposed, which takes into account the relationship between the various phases and changes in these phases during curing. The simplest unit weight estimate is the unreacted unit weight which may be used as a lower-bound estimate of the cured unit weight. More accurate estimates of the unit-weight are possible by considering the effects of hydration of the cement-water paste during curing period, using the “drained” and “undrained” estimates of the unit weights. The drained and undrained assumptions refer to the drainage conditions during curing. Both are consistently closer to the measured unit weights than the unreacted unit weight, with undrained assumption having a slightly better agreement. An empirical relationship is also proposed for estimating the effect of the change of volume arising from consolidation during curing. This may be significant if the treated soil layer lies deep in the ground, where the effective stress levels are high. Comparison with unit weight measurements from a soil mixing project indicate that the calculated unit weight agrees well with the range of unit weight measurements for soft clay. For the loose sand, the calculated unit weight is higher than the measured unit weight, possibly owing to the dilation of sand when sheared, ahead of the mixing shaft.

中文翻译：

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水泥处理土单位重量预测模型

摘要 本文提出了一种合理的估算水泥处理粘土单位重量的方法，该方法考虑了各相之间的关系以及养护过程中这些相的变化。最简单的单位重量估计是未反应的单位重量，它可以用作固化单位重量的下限估计。通过考虑固化期间水泥-水浆体水化的影响，使用单位重量的“排水”和“不排水”估计值，可以更准确地估计单位重量。排水和不排水假设是指固化过程中的排水条件。与未反应的单位重量相比，两者始终更接近测量的单位重量，不排水假设的一致性稍好。还提出了一种经验关系，用于估计固化过程中固结引起的体积变化的影响。如果处理过的土层位于地下深处，有效应力水平很高，这可能很重要。与来自土壤混合项目的单位重量测量值的比较表明，计算的单位重量与软粘土的单位重量测量值范围非常吻合。对于松散的沙子，计算的单位重量高于测量的单位重量，这可能是由于在搅拌轴前方剪切时沙子膨胀。与来自土壤混合项目的单位重量测量值的比较表明，计算的单位重量与软粘土的单位重量测量值范围非常吻合。对于松散的沙子，计算的单位重量高于测量的单位重量，这可能是由于在搅拌轴前方剪切时沙子膨胀。与来自土壤混合项目的单位重量测量值的比较表明，计算的单位重量与软粘土的单位重量测量值范围非常吻合。对于松散的沙子，计算的单位重量高于测量的单位重量，这可能是由于在搅拌轴前方剪切时沙子膨胀。