【作者】 乔继延； 鲁晓兵； 王淑云； 张旭辉；

【Author】 QIAO Jiyan;LU Xiaobing;WANG Shuyun;ZHANG Xuhui;Institute of Mechanics,Chinese Academy of Sciences;

【机构】 中国科学院力学研究所；

【摘要】 越来越多的研究表明,在降雨条件下植物根系分布是影响边坡稳定的重要因素。为研究不同类型根系对边坡稳定的影响,开展了室内模拟降雨实验,分析不同类型植物根系影响边坡稳定的模式,探讨根系特征尺寸和分布的影响机理。实验结果表明:坡体上不连续分布的尺寸较小的孔洞,在土体变形过程中很容易自动封闭、堵塞,不易形成新的局部破坏;粗根系木本植物对于坡体稳定性具有不利的影响,在植物根部与土体接触的位置最容易产生局部破坏;草本植物根系对土体有显著的固化作用,并且其固化作用有一定的影响范围;植物根系对边坡的影响,存在几何尺度和空间分布的效应,当根系分布于潜在滑面的起始点附近时,对阻止边坡失稳具有最明显的效果。研究成果为降雨条件下植物根系的影响机理提供参考。更多还原

【Abstract】 The distribution of plant roots is an important factor affecting slope stability under rainfall conditions by more and more studies.In order to study the influence of different types of roots on slope stability indoor simulated rainfall experiments were accomplished,to analyze the influence modes of different types of plant roots and explore the influence mechanism of root characteristic size and distribution.Results show that in the process of soil deformation the small discontinuous pores in the slope is easy to close and block automatically and not easy to form new local failure.Furthermore,woody plants with coarse roots have adverse effects on slope stability and the local failure is likely to occur at the location of plant roots contacting with soil,but roots of herbaceous plants have a significant strengthening effect on soil and its effects are confined to a certain range.It reveals that there is geometric scale and spatial distribution features for the effects of plant roots on slope,while the root system has the most significant effect on preventing slope instability when it is distributed near the initial point of potential sliding surface.The research results provide a reference for the influence mechanism of plant roots under rainfall conditions.更多还原