CALCULATION MODEL AND EXPERIMENTAL STUDY ON SEDIMENT EROSION OF SLOPE UNDER EXTERNAL-SOIL SPRAY SEEDING

Civil Engineering Journal

Can Li¹  Yang Liu¹  Haiqing Zhou²  Qianghui Song³  Yixin He⁴ 

[1] 1.Army Logistics University, Chongqing Key Laboratory of Geomechanics & Geoenvironment Protection, Chongqing, Daxue North 1st Road 20, 401331 Chongqing, P.R.China;2.Chongqing University of Science and Technology, Chongqing, East Road 20, 401331 Chongqing, P.R.China;3.Chongqing Institute of Geology and Mineral Resources, Lanxin Road 111, 400042 Chongqing, P.R.China;4.School of Geography Sciences, SWU, Tiansheng Road 2,400715 Chongqing, P.R.China;

关键词: External-soil spray seeding;    Slope erosion;    Energy method;    Model test;   

DOI  :  10.14311/CEJ.2019.02.0014

来源: DOAJ

【 摘 要 】

Due to the current lack of theoretical study on rain erosion of the slope under external-soil spray seeding, the calculation model applicable to slope sediment erosion under external-soil spray seeding was derived from hydraulics theory and energy method. Designed slope scouring test on indoor model, conducted 3 separate scouring tests under 3 different slope rates (1:0.75, 1:1, 1:1.25) and 3 different rainfall intensities (120, 150, 180mm/h). The rationality of the calculation model was verified by the experimental data. Meanwhile, also analysed the developing regularities of slope erosion and relationship among sediment erosion, rainfall duration, rainfall intensity and slope rate. The results show that the relative error between the theoretical value and measured data is within 18%, and the calculation model can accurately predict the sediment erosion of the slope under external-soil spray seeding to some extent; the slope under external-soil spray seeding is lack of erosion resistant ability, and the slope erosion is mainly rill erosion and layered surface erosion; the amount of sediment erosion is positively correlated with rainfall intensity and slope rate. The relationship between growth rate and rainfall duration basically remained the same during the first 20 minutes, and then gradually decreased.

【 授权许可】

Unknown