ABSTRACT

Unsealed roads are an important asset providing the necessary connections between regional and metropolitan regimes of a country. However, these roads are affected by severe moisture fluctuations and recurring traffic loads that result in excessive maintenance. Unsealed road pavements are generally partially saturated during their service life, resulting in distinct volume and strength changes subjected to saturation changes. This paper investigates the capability of a novel stabiliser in reducing the adverse impact from moisture fluctuations and dynamic traffic loads on unsealed road pavements using an experimental and modelling approach. Firstly, a series of physical and mechanical tests were conducted on enzyme stabilised soil to explore its response under various saturations and its ability to suppress volume change. The application of subgrade stabilisation was then simulated using a verified modelling approach to assess the effectiveness of the novel stabilisation methodology for constructing unsealed road pavements. Finally, an analytical model was proposed to predict the performance of unsealed roads constructed on stabilised expansive subgrades subjected to loading and moisture cycles. The research highlights the importance of considering the effect of moisture fluctuations in pavement design and the possibility of adopting soil stabilisation for improved performance of unsealed roads constructed on expansive subgrade soil.

摘要

未封闭的道路是一项重要资产，可在一个国家的区域和大都市政权之间提供必要的联系。然而，这些道路受到严重的水分波动和经常性交通负荷的影响，导致过度维护。未密封的道路路面在其使用寿命期间通常会部分饱和，从而导致在饱和度变化下明显的体积和强度变化。本文研究了一种新型稳定剂在减少水分波动和动态交通载荷对未密封道路路面的不利影响方面的能力，使用实验和建模方法。首先，对酶稳定土进行了一系列物理和力学试验，以探索其在各种饱和度下的响应和抑制体积变化的能力。然后使用经过验证的建模方法模拟路基稳定的应用，以评估新型稳定方法在建造未密封路面的有效性。最后，提出了一个分析模型来预测在经受荷载和水分循环的稳定膨胀路基上建造的未密封道路的性能。该研究强调了在路面设计中考虑水分波动影响的重要性，以及采用土壤稳定来提高在膨胀路基土壤上建造的未密封道路的性能的可能性。提出了一个分析模型来预测在经受荷载和水分循环的稳定膨胀路基上建造的未密封道路的性能。该研究强调了在路面设计中考虑水分波动影响的重要性，以及采用土壤稳定来提高在膨胀路基土壤上建造的未密封道路的性能的可能性。提出了一个分析模型来预测在经受荷载和水分循环的稳定膨胀路基上建造的未密封道路的性能。该研究强调了在路面设计中考虑水分波动影响的重要性，以及采用土壤稳定来提高在膨胀路基土上建造的未密封道路的性能的可能性。