中国水土保持科学2025，Vol.23Issue(1)：70-79,10.DOI:10.16843/j.sswc.2024073
含水率变化对四川山矾根土摩阻特性和边坡稳定性影响
Effects of soil moisture content changes on friction characteristics and slope stability of Symplocos setchuensis
摘要
Abstract
[Background]Moisture content is the most frequently changing indicator of soil physical properties,which not only affects the apparent strength of the soil,but also affects the root-soil mechanical action.In the current shallow slope stability assessment researches,the impact of soil moisture content on the root reinforcement is rarely considered.[Methods]In order to clarify the relationship between the root-soil interfacial characteristics and the soil moisture content,and to study the influence of soil moisture on the friction coefficient of root-soil complex,root shear strength and root failure mode,we carried out Symplocos setchuensis root tensile test,root-soil friction experiment based on nine soil moisture content gradients.Then we estimated the additional cohesion of root(cr)under three models through BSTEM(bank stability and toe erosion model)to contrastively analyze root reinforcement.At last,we used GEO-Studio to evaluate slope stability and to analyze the change of slope stability under different soil moisture contents.[Results]1)The tensile strength and pull-out strength of S.setchuensis roots decreased with the increase of root diameter,and the two curves usually had an intersection point and its corresponding root diameter first increased and then decreased(0.12-2.75 mm).2)The friction coefficient of root-soil interface decreased with the increase of soil moisture content.3)The additional cohesion of roots(cr)both increased with the increase of soil moisture content when considering the frictional characteristics of root-soil interface under different soil moisture content:cr(f)<cr(FBM)<cr(Wu),the deviation of cr(f)to cr(FBM)and cr(f)to cr(Wu).4)The slope factor of safety(Fs)decreased with the increase of soil moisture content,and it was more conservative when considering the characteristics of root-soil interface.Fs(Wu)and Fs(FBM)were about 1.53 and 1.02 times of Fs(f).[Conclusions]Soil moisture content influenced the failure mode and pull-out strength of roots by affecting the frictional characteristics of root-soil interface,and thus influenced the soil reinforcement.This indicated that dynamic changes of frictional characteristics of root-soil interface should be considered in analyzing the stability of planted slope under dynamic soil moisture content.This research also provided a more conservative dynamic root reinforcement model compare with Wu and FBM model,which took the weakening mechanism of soil moisture content into account.关键词
根系固土/根土界面摩阻特性/降雨入渗/土壤含水率/边坡稳定性Key words
root reinforcement/the frictional characteristics of root-soil interface/rainfall infiltration/soil moisture content/slope stability分类
农业科学引用本文复制引用
刘雪璇,郑培龙,梁军,王玉杰,李通,王余靖,王鑫皓,王云琦..含水率变化对四川山矾根土摩阻特性和边坡稳定性影响[J].中国水土保持科学,2025,23(1):70-79,10.基金项目
国家重点研发计划"生态保护带人工防护林结构近自然改造与水土保持功能提升技术与示范"(2023YFF1305201) （2023YFF1305201）
