Compressibility and hydraulic conductivity are the key parameters to ensure the structural integrity of landfill liner. The compressibility and hydraulic conductivity of compacted pond ash–bentonite and sand–bentonite mixes were determined from conventional consolidation tests. The results showed that both the compression index and coefficient of volume change increase, whereas the coefficient of consolidation decreases with an increase of bentonite content in the mix. Empirical models are proposed to predict the compression index and hydraulic conductivity of bentonitic mixtures from the basic soil parameters (specific gravity, liquid limit, void ratio and shape parameter), which have been compared and validated with existing models and experimental data sets. The compressibility characteristics of sedimented slurry and compacted mixes do not follow similar trends; therefore, two distinct empirical models are proposed in this study. The observed compression index values of the compacted specimens fall in the range of ± 20% from the line of equality, whereas the deviation is within ± 15% for sedimented slurry. Similarly, the estimated hydraulic conductivity values fall within ± 20% of the values predicted by the proposed empirical equation. Thus, the proposed empirical models may be used to predict the compressibility and hydraulic conductivity of compacted bentonitic mixtures.

中文翻译：

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膨润土混合物的可压缩性和水力传导率的预测

可压缩性和水导率是确保垃圾填埋场衬砌结构完整性的关键参数。根据常规固结试验确定压实的池塘灰－膨润土和砂－膨润土混合物的可压缩性和水力传导率。结果表明，压缩指数和体积变化系数均增加，而固结系数随混合物中膨润土含量的增加而降低。提出了基于基本土壤参数（比重，液体极限，空隙率和形状参数）预测膨润土混合物压缩指数和水力传导率的经验模型，并已与现有模型和实验数据集进行了比较和验证。沉降泥浆和压实混合物的可压缩性特征没有遵循相似的趋势。因此，本研究提出了两种不同的经验模型。实测样品的压缩指数值在等值线的±20％范围内，而沉积浆液的偏差在±15％之内。类似地，估算的水力传导率值落在所提出的经验方程式预测的值的±20％之内。因此，提出的经验模型可用于预测压实的膨润土混合物的可压缩性和水力传导率。而对于沉淀浆液，偏差在±15％以内。类似地，估算的水力传导率值落在所提出的经验方程式预测的值的±20％之内。因此，提出的经验模型可用于预测压实的膨润土混合物的可压缩性和水力传导率。而对于沉淀浆液，偏差在±15％以内。类似地，估算的水力传导率值落在所提出的经验方程式预测的值的±20％之内。因此，提出的经验模型可用于预测压实的膨润土混合物的可压缩性和水力传导率。