木本植物不同部位对土质斜坡稳定性的影响

Influence of the Different Parts of Woody Vegetation on the Stability of Soil Slope

植被护坡是土质斜坡护坡的一种最为常见和有效的措施,一方面可以防止水土流失,另一方面可以美化环境。分析了木本植物不同部位与土质斜坡稳定性的相关性,并运用Geostudio软件模拟计算了在有无植物茎叶和根系情况下土质斜坡的稳定性系数,分析其对土质斜坡稳定性的影响。结果表明:植物茎叶通过截留作用和蒸腾作用等改变地下水水位来影响土质斜坡的稳定性,但在大风和台风情况下植物茎叶会向斜坡传递风荷载而降低土质斜坡的稳定性;植物根系通过加固作用和成孔作用来影响土质斜坡的稳定性;植被衍生物在进行新陈代谢过程中提高了土体的酸度,增加了土体孔洞数量,从而降低了土质斜坡的稳定性。本研究可为植被护坡工程选择植被类型和设计植被空间分布提供理论依据。

Slope protection by vegetation is one of the most common and effective measures of soil slope protection.Generally it has two effects as preventing water loss and soil erosion and beautifying the environment.This paper analyzes the effects of different parts of woody plants on the stability of the soil slope,and uses the simulation software Geostudio to calculate the stability coefficient of soil slope under the condition of stem leaf and root or without,and analyzes its influence on the stability of the slope.The results show that different parts of the woody plants have a certain impact on the stability of soil slope：the stems and leaves of vegetation can improve the slope stability through the effect of interception and transpiration on the water level.In the wind and typhoon situation the stability of the slope is reduced because of the wind load on the slope of the woody plants.The slope stability is influenced by the reinforcement action and pore forming effect of the vegetation root system.Vegetation derivatives improve the soil acidity in the metabolism,increase the soil hole numbers to reduce the slope stability.The paper provides a theoretical guidance for the selection of vegetation types and spatial distribution of vegetation in eco-engineering.