ABSTRACT

The current study aimed at using a simplex lattice mixture design in designing the experiments, evaluating the results, and optimizing the contents of lime, micro silica, and coir fiber for enhancing the strength property of a residual soil. The effect of the independent variables (lime content, micro silica content, and coir fiber content) on the strength property (unconfined compressive strength (UCS)) was investigated by analysis of variance. Besides, strength optimization was carried out using the desirability function approach to determine the optimum additive combinations in achieving maximum strength. The results showed that the fitted model demonstrated a high determination coefficient (98.61%). The optimization of the variables illustrated that utilizing 7.10% micro silica, 2.32% lime, and 0.59% coir fiber produced an optimum UCS of 827.93 kPa with a designated maximum desirability function of (D = 1.00). Also, the predicted optimum combinations were experimentally tested to check the accuracy and dependability of the optimized conditions. The findings show a good correlation between the experimental values and the predicted optimized values by the developed model. Therefore, the developed model is rationally accurate for forecasting the UCS of the lime-micro silica stabilized coir fiber-reinforced soil.

摘要

目前的研究旨在在设计实验、评估结果和优化石灰、微硅石和椰壳纤维的含量以提高残余土的强度性能时使用单晶格混合物设计。通过方差分析研究了自变量（石灰含量、微硅含量和椰壳纤维含量）对强度特性（无侧限抗压强度 (UCS)）的影响。此外，使用意愿函数方法进行强度优化，以确定实现最大强度的最佳添加剂组合。结果表明，拟合模型表现出较高的决定系数（98.61%）。变量的优化表明，使用 7.10% 的微二氧化硅、2.32% 的石灰和 0.59% 的椰壳纤维产生的最佳 UCS 为 827。93 kPa，指定的最大意愿函数为 (D = 1.00)。此外，对预测的最佳组合进行了实验测试，以检查优化条件的准确性和可靠性。结果表明，实验值与所开发模型的预测优化值之间具有良好的相关性。因此，所开发的模型对于预测石灰-微硅稳定椰壳纤维加筋土的 UCS 是合理准确的。