土木与环境工程学报（中英文）2024，Vol.46Issue(2)：23-32,10.DOI:10.11835/j.issn.2096-6717.2021.258
薄层水流冲刷条件下斜坡土体的临界起动
Critical incipient motion of slope soil under thin layer flow scouring
摘要
Abstract
Slope soil erosion is common in hilly regions and reservoir bank slopes,as the primary driving force is brought by the thin overland water flow caused by rainfall or wave run-up,which results in the shear force and subsequently the incipient motion of soil.In order to explore the incipient motion conditions of slope soil under waterflow scouring,the incipient motion test and theoretical research of slope soil were carried out via self-developed testing device.The incipient motion phenomenon of cohesionless soil particles was observed by particle staining and high magnification electron microscopy,and the relationship between incipient motion mode of cohesionless bank slope soil and flow velocity was determined.This study also explored the relationships among differing dry densities,clay contents,and slopes with the critical incipient motion velocity on a clay slope,the results showed that clay content,dry density,and soil gradient had a great impact on the incipient velocity.Compared with the dry density and gradient,clay content had a clearer impact on incipient velocity.The incipient motion velocity equation of cohesionless bank slope soil was verified,and the rolling incipient motion velocity equation was reliable.The incipient motion mode of clay was used to establish the mechanical balance equation of the clay slope.Then,a semi-empirical incipient motion velocity equation of the clay slope was deduced,of which the relevant parameters were solved using the test results.The proposed incipient motion velocity equation showed good fit with the test results,and the verification results demonstrate that the equation is reliable.关键词
临界起动流速/坡面流/土体侵蚀/起动模式/薄层水流Key words
incipient motion velocity/overland flow/soil erosion/incipient motion mode/thin layer flow分类
天文与地球科学引用本文复制引用
王力,陈玙珊,占清华,王世梅..薄层水流冲刷条件下斜坡土体的临界起动[J].土木与环境工程学报（中英文）,2024,46(2):23-32,10.基金项目
国家自然科学基金(U21A2031) （U21A2031）
中国博士后科学基金(2021M701969) National Natural Science Foundation of China(No.U21A2031) （2021M701969）
China Postdoctoral Science Foundation(No.2021M701969) （No.2021M701969）
