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Mechanical analysis of interaction between plant roots and rock and soil mass in slope vegetation

Applied Mathematics and Mechanics(English Edition) 2010年第5期31卷 617-622页

作者：言志信宋云江平王后裕 Key Laboratory of Mechanics on Disaster and Environment in Western China (Lanzhou University) Ministry of Education School of Civil Engineering and Mechanics Lanzhou University College of Civil Engineering and Mechanics Central South University of Forestry and Technology Air Force Engineering Design & Research Bureau

With the help of plant roots, slope vegetation makes the slope soil mass become a composite material of soil and roots, and thus enhances shear strength of the slope soil mass and stability of the slope. However, the related studies at present are still qualitative. In this paper, quantitative analysis of the interaction between roots and soil mass are made. By the analysis of the interaction between herbaceous plant roots including lateral roots of woody plants and rock and soil mass, a mechanical model of the interaction between frictional roots and soil is established, and its correctness is shown. A mechanical model of the interaction between anchorage root, namely, woody plant taproot, and soil is also established. The establishment of the models provides a useful means in quantitative analysis of the interaction between plant roots and soil, and has practical values.

关键词： slope vegetation vegetation for slope protection mechanical model frictional root anchorage root

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Study on Original Ecological Tridimensional slope vegetation

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Journal of Mountain Science 2013年第6期10卷 932-939页

作者： YAN Zhi-xin REN Zhi-hua YAN Chang-ming JIANG Ping WANG Hou-yu Key Laboratory of Mechanics on Environment and Disaster in Western China (Lanzhou University) the Ministry of Education of China School of Civil Engineering and Mechanics Lanzhou University College of Civil Engineering and Mechanics Central South University of Forestry and Technology Air Force Engineering Design & Research Bureau

No matter from the perspective of slope protection, landscape effect and construction cost, or from the perspective of ecological benefit, the development of original ecological tridimensional vegetation has become the inevitable trend for slope vegetation in pursuit of protecting ecological condition, decreasing soil erosion, maintaining ecological balance and beautifying environment of slope. The concept of original ecological tridimensional slope vegetation is proposed in this paper, and the original ecological tridimensional slope vegetation is studied through theoretical analysis and experiments. Specifically, the mechanical effect of slope vegetation in reinforcing the cohesion and shear strength of soil mass is firstly discussed, and then experiments are performed to study the water interception and containing function of slope under various vegetation conditions. Moreover, the relation between soil moisture and cohesion, the relation between root distribution density and cohesion, and the relation between root distribution density and soil shear strength are also studied based on ***, based on field observation, the soil erosion states of slope under various vegetation conditions are comparatively studied. It is found that the original ecological tridimensional slope, which combines grass,shrub and tree, can generate comprehensive slope protection effects, and hence strengthen the slope protection ability and bring multiple slope protection benefits. Thereby, the theoretical foundation for developing original ecological tridimensional slope vegetation is established.

关键词： Original ecology Tridimensional slope slope vegetation

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Mechanical interaction between roots and soil mass in slope vegetation

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Science China(Technological Sciences) 2010年第4期53卷 3039-3044页

作者： YAN ZhiXin YAN ChangMing WANG HouYu Key Laboratory of Mechanics on Disaster and Environment in Western China(Lanzhou University) Ministry of EducationLanzhou 730000China School of Civil Engineering and Mechanics Lanzhou UniversityLanzhou 730000China College of Civil Engineering and Mechanics Central South University of Forestry and TechnologyChangsha 410004China Air Force Engineering Design&Research Bureau Beijing 100077China

The most basic function of slope vegetation is to strengthen rock and soil mass through plant roots which increase the shear strength of the slope markedly and thereby increase the stability of the slope. However, the calculation of the reinforcement ability of slope vegetation still remains at the stage of judging by experience, because it is rather difficult due to the intricacy and volatility of the force condition of plant roots in rock and soil medium. Although some scholars have tried to study the interaction between plant roots and soil mass, the systemic analysis of the mechanical reinforcement mechanism and the contribution of plant roots to strengthening the rock and soil mass on the surface of the slope is untapped. In this paper, by analyzing the mechanism of slope vegetation and the corresponding reinforcement effect, the effects that slope vegetation generates on the shear strength of slope soil mass are studied, thereby a theoretical basis for plant protection designing is provided.

关键词： slope vegetation mechanical model herbaceous plant woody plant

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