Abstract: In virtue of fracture mechanics，the authors analyzed the anti-cracking and tenacity increasing mechanism of flexi- ble fiber in flexible fiber cement-stabilized material semi-ri6d base，and carried out a relevant experimental study.The analysis and experimental stray show that the flexible fiber cement-stabilized material is a new semi-rigid base with eminent anti- crack，anti-shrinkage，anti-fatigue，anti-impact performance and good tenacity.Application of this new style base will resolve the early age cracking of the existing bases efectively，improve the service-life of pavement structure impressively and have a notable impact on economic eficiency and social importance.

Key words: flexible fiber, cement-stabilized material semi-rind base, anti-cracking and tenacity increasing mechanism, anti-crack performance, experimental study

摘要： 利用断裂力学原理，分析了柔性纤维水泥稳定粒料基层中纤维的阻裂增韧机理，并进行了相关试验研究．表明 柔性纤维水泥稳定粒料半刚性基层材料是一种具有优良抗裂、抗疲劳、抗收缩、抗冲击性能且韧性好的新型半刚性 基层材料．该基层材料的应用将有效解决现行路面半刚性基层的早期开裂问题，大幅度延长路面结构的使用寿命， 具有显著的经济价值和重要的社会意义．

关键词: 柔性纤维, 水泥稳定粒料半刚性基层, 阻裂增韧机理, 抗裂性能, 试验研究