断面抽取对抛石护岸工程水下抛投效果评价影响  

Influence of detection section extraction on evaluation of underwater throwing effect of riprap revetment project

作　　者：王茂枚 罗青 赵钢 陈楠 刘晓兵 WANG Maomei;LUO Qing;ZHAO Gang;CHEN Nan;LIU Xiaobing(Jiangsu Hydraulic Research Institute,Nanjing 210017,China;Rugao Xinying Water Conservancy Municipal Engineering Co.,Ltd.,Nantong 226599,China)

机构地区：[1]江苏省水利科学研究院,江苏南京210017 [2]如皋市新潆水利市政工程有限公司,江苏南通226599

出　　处：《人民长江》2021年第11期146-149,共4页Yangtze River

摘　　要：抛石护岸工程质量检测的主要方法是通过抽取检测断面,分析断面上的测点增厚和断面增厚是否达到设计要求来判断断面是否合格,而断面抽取具有随机性,这种随机性会对水下抛石效果整体评价结论产生影响。选取长江镇扬河段六圩弯道开发区段抛石护岸工程为研究对象,通过对比不同组断面的统计结果,利用GIS(地理信息系统)空间分析技术分析不同组的检测断面如何影响抛石质量评价。研究结果表明:相同的区域抽取不同的检测断面会得到不同的评价结论,欠抛率≤25%或≥50%的区域评价结论一致性高,而欠抛率位于25%~50%的区域,工程质量评价易受欠抛区聚集与分布情况的影响,欠抛区越集中且顺流方向分布,区域不合格评价的一致性越高;相反,欠抛区越分散并垂直岸线分布,区域合格评价的一致性越高。为确保评价的准确性,建议提升抛投工艺,尽量做到准确、均匀抛投,并增加抛石增厚的均匀度检测指标。The main method for the quality detection of riprap revetment engineering is extracting the detection section,then analyzing whether the thickening of the measuring points and the sections meet the design requirements.But the randomness of cross-section extraction will affect the overall evaluation conclusion of underwater riprap effect.In this paper,the riprap revetment project in the development zone of Liuwei bend in Zhenjiang-Yangzhou reach of Changjiang River was selected as the research object.By comparing the statistical results of different groups of sections,the GIS spatial analysis technology was used to analyze how the detection sections of different groups affect the quality evaluation of riprap.The results showed that different detection sections in the same area would produce different evaluation conclusions.The consistency of regional evaluation conclusions was high when the riprap deficient rate less than 25%or greater than 50%.While the riprap deficient rate was located in the area of 25%~50%,the engineering quality evaluation was easily affected by the aggregation and distribution of the riprap deficient area.The more concentrated the riprap deficient area and the distribution along the flow direction,the higher the consistency of the regional unqualified evaluation was.On the contrary,the more dispersed the riprap deficient area and the vertical shoreline distribution,the higher the consistency was.In order to ensure the evaluation accuracy,it was recommended to improve the riprap process,try to achieve accurate and uniform riprap,and increase the uniformity detection index of the thickening of the riprap.

关 键 词：抛石护岸工程 抛石效果评价 欠抛率 一致性 GIS空间分析 长江镇扬河段 

分 类 号：TV523[水利工程—水利水电工程]