›› 2011, Vol. 32 ›› Issue (2): 453-458.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Mechanism analysis of ecological slope protection against runoff erosion by grass jetting on 3D geomat

XIAO Cheng-zhi 1, 2, SUN Jian-cheng 1, 2, LI Yu-run 1, 2, LIU Xiao-peng1   

  1. 1. School of Civil Engineering, Hebei University of Technology, Tianjin 300132, China; 2. Technology and Research Center of Civil Engineering of Hebei Province, Hebei University of Technology, Tianjin 300132, China
  • Received:2009-02-15 Online:2011-02-10 Published:2011-02-16

Abstract:

Combining with theories of hydraulics and river dynamics, numerical expressions of head loss resulting from different types of 3D geomat with roughness and local head loss of runoff resulting from grass are given respectively; and then formula calculating runoff velocity of slope surface for grass jetting on 3D geomat and toggling velocity of soil aggregate based on the theory of river dynamics are established. Furthermore, on the basis of calculation results, comparative analyses are made to examine effects of slope angles, types of 3D geomat, types of grass, and density of grass on runoff velocity of slope toe. The results show that the runoff velocity of slope toe increases with increase of slope angle; and types of 3D geomat do not affect significantly on runoff velocity, but can lower remarkably runoff velocity compared with non-slope protection; runoff velocity of slope toe decreases with increase of inclination angle for base and leaf of grass. In addition, the minimum density value of grass can be achieved by supposed to be equal of toggling velocity for soil and runoff velocity of slope toe. The results about mechanism of grass jetting on 3D geomat could be used to guide project practices.

Key words: grass jetting on 3D geomat, ecological slope protection, runoff velocity of slope toe, toggling velocity of soil aggregate, head loss, runoff

CLC Number: 

  • TV 223.4
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