石笼网垫护坡结构抗冲刷性能水槽模型试验  

Experimental Study on Scouring of Flume with Stone Cage Net

作　　者：王远明[1,2] 张桂荣 李登华[3] 假冬冬[3] 张家胜[4] 杨学春 WANG Yuanming;ZHANG Guirong;LI Denghua;JIA Dongdong;ZHANG Jiasheng;YANG Xuechun(College of Engineering and Technology,Northeast Forestry University,Harbin 150040,China;Heilongjiang Sanjiang Engineering Construction Administration,Harbin 150036,China;State Key Laboratory of Hydrology Water Resources and Hydraulic Engineering,Nanjing Hydraulic Research Institute,Nanjing 210024,China;MCC Huatian Engineering&Technology Corporation,Nanjing 210019,China)

机构地区：[1]东北林业大学工程技术学院,黑龙江哈尔滨150040 [2]黑龙江省三江工程建设管理局,黑龙江哈尔滨150036 [3]南京水利科学研究院水文水资源与水利工程科学国家重点实验室,江苏南京210024 [4]中冶华天工程技术有限公司,江苏南京210019

出　　处：《人民黄河》2020年第4期94-98,共5页Yellow River

基　　金：国家重点研发计划项目(2017YFC0405100);国家自然科学基金资助项目(51979174,51779148)。

摘　　要：石笼网垫护坡结构在河流岸坡生态防护工程中应用较为广泛,网垫结构技术参数对其护坡效果影响较大,不同网垫厚度、隔板间距及网垫内碎石填充情况等都会对其抗冲刷性能产生一定影响。通过室内大型水槽模型试验,研究确定不同厚度、不同隔板距离、不同逊径颗粒含量下石笼网垫护坡结构破坏的临界流速,揭示不同水流冲刷作用下网垫结构的变形过程与破坏规律。通过临界流速定义石笼网垫护坡结构抗冲刷性能,以此确定石笼网垫护坡结构设计的最优参数。水槽冲刷试验结果表明:逊径配比对石笼网垫的抗冲刷性能具有显著影响,建议网垫内填石的逊径配比不超过15%;隔板间距较小时,填石间可移动孔隙较小,易形成整体稳定结构,故在施工工艺可行的条件下,减少隔板间距可提高填石的稳定性和石笼网垫的抗冲性;为保证填石的相对稳定,石笼网垫应保证至少有2层填石,考虑填充率的因素,最优厚度应为网垫内部填石中值粒径的2倍。The slope protection structure of stone cage net cushion is widely used in the engineering of river bank slope protection.The tech nical parameters of the net cushion structure have significant effects on bank slope protection,and different net cushion thicknesses,baffle spacing and gravel filling conditions will have a certain impact on its anti erosion performance.Through indoor large scale sink flush test,the critical velocity was studied for stone cage mat structure with different thicknesses,different baffle distance and different contents of inferior diameter particles.The deformation process and failure rule of mat structure were revealed under different flow scouring.The anti scour per formance was defined by the critical flow rate,so as to determine the optimal parameters.The results show that the inferior diameter ratio has a significant effect on the anti scour performance and it is recommended that it should not exceed 15%;when the spacing of the barriers is small,the rockfill is easy to form an overall stable structure and the movable gap between the rockfills is small.In the condition of feasible construction technology,it can improve the stability of filling stone and the anti erosion performance of stone cage net cushion by reducing the partition spacing.In order to ensure the relative stability of stone filling,two layers of stone should be filled in stone cage net cushion at least.Considering the filling rate,the optimal thickness should be two times of the median particle size of filled stone.

关 键 词：石笼网垫 抗冲性能 临界流速 逊径配比 水槽模型试验 

分 类 号：TV861[水利工程—水利水电工程]