南方湿热地区柔性基层路面结构参数设计研究

Research on Structural Parameter Design of Flexible Base Pavement under Humid and Hot Environment of South Area

摘要: 为推广组合式柔性基层结构在南方湿热地区的应用，依据行业规范，选取福建地区典型路面材料，进行试验与统计分析，制定材料设计经验值。研究结果表明福建省的沥青混合料在动态模量上虽达标，但数值较全国平均值偏低；对于PE改性剂，其掺加比例建议控制在不超过0.35%为宜；级配碎石的动态模量受到多种因素如含水状态、体积应力、围压及密实程度的共同影响；按照实测服役期含水率变化规律，取最佳含水率靠近下限作为设计推荐值。本研究为湿热气候条件下的柔性基层结构设计及其实际应用提供了宝贵的见解，对促进福建等地区的路面工程建设与实践发展具有重要意义。

Abstract: To promote the application of composite flexible base structures in humid and hot environments, based on industry standards, typical pavement materials from Fujian Province were selected for experimental and statistical analysis to establish empirical values for material design. The research results indicate that while the asphalt mixtures in Fujian meet the dynamic modulus standards, their values are lower than the national average. For PE modifiers, it is recommended to control the blending ratio at no more than 0.35%. The dynamic modulus of graded crushed stone is influenced by multiple factors, including moisture content, volumetric stress, confining pressure, and degree of compaction. Considering the measured moisture content variation during service life, the recommended design value is set close to the lower limit of the optimal moisture content range. This study provides valuable insights into the design and practical application of flexible base structures in hot-humid climates, which is of great significance for promoting pavement engineering construction and practical development in Fujian and other regions.