Classification of rainfall in the country.

A key challenge in highway reconstruction and expansion projects is to reduce longitudinal cracking at the junction of old and new roadbeds, which is a critical issue in the maintenance of transportation infrastructure. Polymer grouting technology, a non-excavation method for hidden subgrade defects, leverages material self-expansion properties to fill voids, enhance load-bearing capacity, and bond structural layers while providing seepage control—enabling rapid repair of longitudinal pavement joints. This study investigates the seepage characteristics of polymer-grouted longitudinal joints in reconstructed pavements by simulating post-repair infiltration behavior under rainfall conditions. The results elucidate the anti-seepage efficacy of polymer grouting, offering theoretical and practical insights for efficient longitudinal joint treatment in highway expansion projects.

公路改扩建工程的核心挑战之一，是减少新旧路基衔接处的纵向裂缝，该问题亦是交通基础设施养护领域的关键难题。聚合物注浆技术（Polymer grouting technology）作为一种针对隐蔽路基病害的非开挖治理技术，依托材料自身的膨胀特性填充空隙、提升结构承载能力并粘结各结构层，同时兼具防渗功能，可实现路面纵向接缝的快速修复。本研究通过模拟修复后路面在降雨条件下的渗流行为，探究改扩建路面经聚合物注浆处理后的纵向接缝的渗流特性。研究结果阐明了聚合物注浆的防渗效能，可为公路改扩建工程中纵向接缝的高效处治提供理论与实践参考。