ABSTRACT

This research evaluated the effect of different moisture conditions on the ductility, geotechnical and microstructural characteristics of the improved clayey subgrade with various lime contents and geogrid layers. The results of more than 120 tests showed that the combined application of lime and geogrid to the clayey subgrade significantly enhanced the ductility and geotechnical characteristics by increasing the moisture content up to an optimal value. It was observed that higher water pressure led to the separation of the geogrid layers from the improved subgrade; thus, the uniformity, consistency, and geotechnical properties were significantly reduced. Microstructural analysis showed that increasing the amounts of moisture more than the optimal values caused more voids which led to a substantial decrease in the geotechnical properties as well as the physical bonding between geogrid layers and lime-stabilised soil. Finally, a simple prediction model was developed to estimate the geotechnical characteristics of the improved clayey subgrade.

摘要

本研究评估了不同水分条件对具有不同石灰含量和土工格栅层的改良粘土路基的延展性、岩土工程和微观结构特征的影响。120多项试验结果表明，石灰和土工格栅联合应用于粘土路基，通过将含水量提高到最佳值，显着提高了延展性和岩土特性。据观察，较高的水压导致土工格栅层与改良路基分离；因此，均匀性、一致性和岩土特性显着降低。微观结构分析表明，增加水分含量超过最佳值会导致更多的空隙，从而导致岩土工程性能以及土工格栅层和石灰稳定土壤之间的物理结合显着下降。最后，开发了一个简单的预测模型来估计改良粘土路基的岩土特性。