Journal of Yangtze River Scientific Research Institute ›› 2022, Vol. 39 ›› Issue (9): 102-108.DOI: 10.11988/ckyyb.20210439

• ROCK-SOIL ENGINEERING • Previous Articles     Next Articles

Numerical Analysis of Slope Protection Effect of Root System of Different Plants Considering Hydrological Effect

LIAO Tian-ting1, JIANG Guan-lu1, ZHANG Chong-lei1,2, SHAN Yuan-chun1, YE Xiong-wei1   

  1. 1. School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;
    2. Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu 610041,China
  • Received:2021-05-08 Revised:2021-07-09 Online:2022-09-01 Published:2022-09-21

Abstract: The aim of this research is to compare the influence of root systems of different vegetation types on water transport in slope and shallow soil-stabilizing effect under rainfall condition.The slope reinforced with three different plants’ root system and the unreinforced slope were numerically simulated under intermittent rainfall and heavy rain conditions using a secondary development of FISH programming module of FLAC3D,and the simulation results were compared with the that of centrifugal model test.The results demonstrated that root system could solidify the soil by preventing from water infiltration.Heart-root-reinforced slope has a entirely different water transport law from plain slope (unreinforced slope) which has a larger water permeation rate of the near-slope surface than that of the far-slope surface.Heart-root system has an optimum transpiration,while plate-root system better resists shallow rainfall erosion and penetration due to its wide wings. In general,heart-root system could reduce the moisture inside the slope body best.The maximum horizontal displacement of taproot,plate-root and heart-root reinforced slope reduce by 52.22%,73.68% and 70.24%,respectively.In conclusion,heart-root system has the best soil-stabilizing effect.In addition,the numerical simulation results are in agreement with centrifugal model test results,which verifies the correctness and effectiveness of the developed program,and lays a foundation for the simulation of more working conditions and more complex root types.

Key words: roots of plants, rainfall, saturated-unsaturated seepage, hydrological effect, reinforcement effect, FLAC3D

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