title: Effects of root spatial distribution on the elastic-plastic properties of soil-root blocks.
abstract: Plant roots significantly influence soil properties, especially in soil beyond the limited area surrounding the main root stem. Some bias results may be generated if plastic properties of soil are merely used in evaluating slope stability without considering the effects of plant roots. In this research, effects of root spatial distribution on the elastic-plastic characteristics of soil-root blocks were examined. Triaxial tests and the Duncan-Chang model were used to analyze the correlation between root spatial characteristics and soil elastic-plastic properties. Safety factors of vegetated slopes were calculated to investigate the effect of roots on slope stability. The limit stress of remoulded soil was 103.52% to 231.61% greater than undisturbed soil in shallow soil layers. Increased root quantity led to an increased the failure ratio of soil bulk and the initial tangent modulus increased with root diameter. When calculating the safety factor of vegetated slopes, soil indexes for soil beyond the small cylinder surrounding the main stem should be properly considered to avoid safety factor overestimation.
authors.affiliation: School of Soil and Water Conservation at Beijing Forestry University, Beijing, 100083, China.
authors.forename: Yunpeng
authors.initials: Y
authors.lastname: Li
authors.affiliation: School of Soil and Water Conservation at Beijing Forestry University, Beijing, 100083, China. wangyunqibj@163.com.|Soil and Water Conservation of Beijing Engineering Research Center at Beijing Forestry University, Beijing, 100083, China. wangyunqibj@163.com.
authors.forename: Yunqi
authors.initials: Y
authors.lastname: Wang
authors.affiliation: School of Soil and Water Conservation at Beijing Forestry University, Beijing, 100083, China.|Soil and Water Conservation of Beijing Engineering Research Center at Beijing Forestry University, Beijing, 100083, China.
authors.forename: Yujie
authors.initials: Y
authors.lastname: Wang
authors.affiliation: School of Soil and Water Conservation at Beijing Forestry University, Beijing, 100083, China.
authors.forename: Chao
authors.initials: C
authors.lastname: Ma
mesh_terms: D000465:Algorithms; D008962:Models, Theoretical; D063245:Plant Development; D018521:Plant Physiological Phenomena; D018517:Plant Roots / Q000254:growth & development*; D012987:Soil
chemical_list: D012987:Soil