Effects of root spatial distribution on the elastic-plastic properties of soil-root blocks

被引：19

作者：

Li, Yunpeng ^{[1
]}

Wang, Yunqi ^{[1
,2
]}

Wang, Yujie ^{[1
,2
]}

Ma, Chao ^{[1
]}

机构：

[1] Beijing Forestry Univ, Sch Soil & Water Conservat, Beijing 100083, Peoples R China

[2] Beijing Forestry Univ, Soil & Water Conservat Beijing Engn Res Ctr, Beijing 100083, Peoples R China

来源：

SCIENTIFIC REPORTS | 2017年 / 7卷

基金：

中国国家自然科学基金;

关键词：

SHEAR RESISTANCE; SLOPE STABILITY; REINFORCEMENT; VEGETATION; SYSTEMS; MODELS; LAYOUT;

D O I：

10.1038/s41598-017-00924-z

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页数：11

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