软弱岩床河道的冲蚀机制与抗冲蚀力评估  

Erosion Mechanism and Erosion Resistance Evaluation of Weak Bedrock Channel

作　　者：张宏恩 ZHANG Hongen(Nanyang South-North Water Transfer Project Service Center(Nanyang Immigration Service Center),Nanyang 473000,China)

机构地区：[1]南阳市南水北调工程运行保障中心(南阳市移民服务中心),河南南阳473000

出　　处：《河南水利与南水北调》2022年第5期95-96,共2页Henan Water Resources & South-to-North Water Diversion

摘　　要：中国某些地区的岩层主要为上新世及更新世的地层,此类岩体在强度性质上为介于岩石与过压密土壤之间的“软岩”材料。当河道护甲层冲失使此类岩体出露于河床后,在水流的作用下会产生严重的冲刷侵蚀,且其冲蚀行为与颗粒性材料有相当大之差异,所以了解软岩河床的冲蚀为研究中国西部河川冲蚀的重要课题。目前对于河床冲蚀的分析,大都采用计算分布于河床上的剪应力或流动的方式来评估冲蚀的量与速率,很少考虑到岩床本身地质条件的不同,影响到冲蚀机制,进而改变冲蚀的结果。研究提出河段可能的软岩河床冲蚀机制,进而对不同冲蚀机制下作冲蚀速率的比较。The rock strata in some areas of China are mainly pliocene and Pleistocene strata, which are“soft rock”material between rock and overcompacted soil in terms of strength and property. The erosion behavior of soft bedrock is quite different from that of granular material. Therefore, it is an important subject to understand the erosion of soft bedrock in the study of river erosion in western China. At present, most analyses of riverbed erosion are based on the calculation of shear stress or flow energy distributed on the riverbed to evaluate the amount and rate of erosion, but the different geological conditions of the rock bed itself is seldom considered,which will affect the erosion mechanism and change the erosion results. In this study, the possible erosion mechanisms of soft rock riverbed are proposed and the erosion rates are compared under different erosion mechanisms.

关 键 词：软岩 河道冲蚀 冲蚀机制 

分 类 号：P59[天文地球—地球化学]