国道G105线K2617～K2678段强降雨灾毁路面修复与加固关键技术研究

Research on Key Technologies for Pavement Repair and Reinforcement Damaged by Heavy Rainfall on K2617～K2678 Section of National Highway G105

摘要:

国道G105线K2617～K2678段位于珠江三角洲冲积平原河网区，汛期受极端强降雨与外江顶托影响显著，叠加长期重载交通作用，路面出现路基软弹沉陷、基层唧泥脱空、面层网裂坑槽等连片水毁病害。依托该路段灾毁恢复工程，构建“精细化检测-分级处置-结构加固-排水优化”成套修复技术体系，采用压力注浆、全深式冷再生、挖换补强及土工格栅加筋等组合工艺，对面层病害实施微创修补与同步罩面，同时优化排水系统。工程实践表明，修复后路面结构强度、平整度及抗滑性能均满足规范要求，路况优良率由72%提升至96%，抗水毁能力显著增强。研究成果可为珠三角及同类平原河网地区干线公路灾毁修复提供技术参考。

Abstract:

The K2617-K2678 section of National Highway G105 is located in the river network area of the Pearl River Delta alluvial plain. Affected by extreme heavy rainfall and river backwater during flood seasons as well as long-term heavy traffic load, the pavement shows continuous water damage diseases such as soft and elastic subsidence of the subgrade, mud pumping and voiding of the base layer, and network cracks and potholes on the surface layer. Relying on the disaster recovery project of this road section, a complete set of repair technology system featuring “refined detection - hierarchical disposal - structural reinforcement - drainage optimization” is built. The combined technologies including pressure grouting, full-depth cold recycling, excavation and geogrid reinforcement are adopted to conduct the minimally invasive repair and simultaneous covering for surface layer diseases, and optimize the drainage system at the same time. Engineering practice shows that the structural strength, flatness and skid resistance of the repaired pavement meet the standard requirements, the good road condition rate increases from 72% to 96%, and the flood damage resistance is significantly improved. The results can provide technical references for the disaster repair of trunk highways in the Pearl River Delta and similar plain river network areas.