砂质浅滩抛石丁坝结构稳定性分析及防护措施

Structural stability analysis and protective measures of riprap spur dike in sand shoal

针对砂质浅滩抛石丁坝容易发生沉降塌陷的问题,通过对西江龙圩水道与鸡笼洲滩抛石丁坝进行原形观测,对影响丁坝结构稳定性的因素进行研究,采用泥沙运动理论对原形测试进行分析,得出丁坝基础受到冲刷破坏是引起坝体失稳的主要因素的结论,利用袋装砂护底和碎石或石碴做丁坝基础填料可增强丁坝基础防冲刷能力。这一结论可为砂质浅滩航道整治抛石丁坝施工提供技术借鉴。

In view of the settlement and collapse occur easily at riprap spur dike,the prototype observation is carried out for the riprap spur dike used in the waterway regulation at Longxu channel of the Xijiang River and Jilongzhou shoal to investigate the main influential factors on the stability of the spur dike body.Based on the comparison and analysis of sediment movement prototype,this study found that,the scouring damage of the spur dike foundation is the main factor that causes dike body’s instability.To enhance the ability of preventing erosion,the spur dike foundation should construct with sandbag or gravel or stone slag.The result may serve as referenced technology for waterway regulation on the riprap spur dike in the sand shoal.