复杂流态下长江深槽岸坡沙袋防护设计与施工

Design and construction of sandbag protection for shore slope of deep groove in the Yangtze River under complex flow state

复杂流态下长江深槽岸坡最适用的防护形式为抛石,但受块石来源枯竭影响,亟需寻找合适的防护材料。在长江南京段已有的工程实践基础上,首次采用沙袋对复杂流态河段长江深槽岸坡进行防护。介绍长江南京八卦洲头右缘深槽岸坡防护工程的结构断面、沙袋体型、充填料、土工织物等有关设计情况。针对如何确保沙袋抛投落点位置准确这一关键问题进行分析研究,采取了优选施工船舶、合理分层分区、生产性试验、二次定位法、动态量测修正、加密检测频次等解决措施,确保了工程质量,为类似工程提供依据。

The most suitable type of protection for the bank slope of the deep groove in the Yangtze River in complex flow regimes is rock throwing.However,due to the depletion of the source of block stones,it is urgent to find a suitable protective material.Based on the existing engineering practice in the Nanjing section of the Yangtze River,sandbags are used for the first time to protect the deep groove slope of the Yangtze River in the complex flow ingress.This study introduces the structural section,sandbag body type,filling,geotextile and other relevant design conditions of the deep groove slope protection project on the right edge of the head of Nanjing Baguazhou in the Yangtze River.This paper analyzes and studied the key issues of how to ensure the accurate location of sandbag drop points.This study adopts the solution measures such as preferred construction ship,reasonable layered partition,production test,secondary positioning method,dynamic measurement correction,and increasing the detection frequency to ensure the quality of the project and provided the basis for similar projects.