引用本文:张壮,潘毅,陈永平,胡玉植,张同鑫,李琳.高速明渠流条件下高性能加筋草皮抗侵蚀特性研究[J].水利水运工程学报,2018,(6):77-83
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高速明渠流条件下高性能加筋草皮抗侵蚀特性研究
张壮1,2, 潘毅1,2, 陈永平1,2, 胡玉植3, 张同鑫1,2, 李琳4
1.河海大学水文水资源与水利工程科学国家重点实验室,江苏南京;2.河海大学港口海岸与近海工程学院,江苏南京;3.中国电建集团中南勘测设计研究院有限公司,湖南长沙;4.杰克逊州立大学土木与环境系,杰克逊密西西比
摘要:
现有针对高性能加筋草皮的抗侵蚀性能研究,大多建立在大规模试验基础上,重点研究允许冲刷流速和表面切应力。为了研究高速明渠水流条件下高性能加筋草皮侵蚀过程,对天然草皮和3种高性能加筋草皮共48个样品进行培植,并布置在高速明渠流的倾斜水槽中,通过不同坡度和流量分别进行间断和不间断冲刷试验,分析流速、流量和侵蚀量的关系。结果表明,间断和不间断冲刷的侵蚀速率有明显差异,说明初始冲刷引起了高性能加筋草皮的大部分侵蚀。样本侵蚀过程显示侵蚀速率随侵蚀量的增加而降低,证明明渠高速水流作用下加筋草皮存在“侵蚀上限”特征。此外,还讨论了流量和生态加筋网结构对侵蚀过程的影响,并尝试拟合了平均侵蚀速率与水流表面流速的关系。
关键词:  护坡  高性能加筋草皮  抗冲蚀能力  初始冲刷  侵蚀上限
DOI:
分类号:TV131.6; TV133
基金项目:国家重点研发计划资助项目(2016YFC0401505); 江苏省自然科学基金资助项目(BK20130833)
Experimental studies of anti-erosion ability of high-performance reinforced turf on high-speed open channel
ZHANG Zhuang1,2, PAN Yi1,2, CHEN Yongping1,2, HU Yuzhi3, ZHANG Tongxin1,2, LI Lin4
1.State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing;2.College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing;3.Zhongnan Engineering Corporation Limited, Changsha;4.Department of Civil and Environmental Engineering, Jackson State University, Jackson, MS
Abstract:
The high-performance turf-reinforced mat (HPTRM) is a new type of strengthening material which has been widely used in recent years to protect the vegetation linings and enhance their anti-erosion ability. The existing studies on the erosion resistance of the vegetated HPTRM systems are mainly based on the large-scale tests and focus on the permissible flow velocity and shear stress. In order to study the erosion process of the vegetated HPTRM system under the high-speed open channel flow conditions, a total of 48 specimens of natural vegetation and three types of vegetated HPTRM systems are cultivated. In a special flume designed to generate the high-speed open-channel flow, continuous and discontinuous flushing tests are carried out under different slopes and discharges. During the testing, the erosion depths of specimens, the flow discharges and flow surface velocities are recorded. The differences in erosion rates between the continuous and discontinuous tests indicate that the first flushing of the flow, which means the process of no flow to flow, induces most of the erosion of the vegetated HPTRM systems. The erosion processes of the specimens show a decrease of the erosion rate with the increase in the erosion depth, which proves the existence of the “upper limit” of erosion, which can be explained by the exposure of HPTRM and consequent increase of the anti-erosion ability. We have also discussed the influences of the flow discharges and HPTRM structures on the erosion processes, and try to fit the relationships between the average erosion rate and the flow surface velocity with the linear relationships.
Key words:  slope protection  high-performance turf-reinforced mat  erosion resistance  first-flushing  upper limit of erosion
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