河道生态护岸设计中的底泥固化技术中试

摘要

Nowadays,some small and medium sized rivers in Chongming Island are confronted with the problems of riverbed sedimentation and black and malodorous river.A pilot scale test for the ecological revetment design of a 60-meter river in Gangyan Town,Chongming District,Shanghai,was carried out based on the theory of sediment solidification and stabilization.According to the actual situation of the riverbank,solidified sediment and slope soil were taken as raw materials,and the construction was carried out based on Code for Design of Levee Project (GB 50286-2013).Stones or building wastes were stacked and concreted on the riverbed to reinforce the foundation.Eco-bricks of building material type and light type were utilized to construct revetment Plants were cultivated on the slope after in-situ solidification of the slope soil layer.All these measures not only stabilized the slope soil,but also beautified the environment and restored the natural habitat along the river.The project analysis demonstrated that the revetment structure was stable in 90 days and the leaching toxicity met the national standard.pH of the river water stayed at alkalescency level and no significant variation was observed.Natural ecosystem around the riverbank has been recovered.%河床淤积和河道黑臭现象是当前崇明部分中小河道面临的主要问题.选择上海市崇明区港沿镇60m独立河道作为研究对象,基于底泥固化/稳定化的技术理论,进行了崇明河道护岸生态中试工程.根据河岸现状,以固化后的河道底泥和边坡土壤为原料,以《堤防工程设计规范》(GB 50286-2013)中的堤防工程标准进行砌筑,在近岸河床底部采用置石或建筑废料堆砌加固,护岸砌筑使用建材式生态砖和轻质生态砖,护坡土层原位固化后栽种植物,最终达到了稳定边坡土壤、美化河道环境和恢复河道生态的目标.工程分析表明,该中试工程的护岸在90d内结构稳定安全,浸出毒性符合国家标准.河道水pH值保持为弱碱性,没有发生明显变化,河岸周围自然生态逐步恢复.