CAJ | 학술논문

丰富的草本及灌木植物根系可防止地表水土流失并增加浅层坡体稳定性。为了定量化分析在不同坡度条件下，有植被防护的土质边坡稳定性变化特征，采用室内不固结不排水三轴压缩试验，测定青海省东部黄土区土质边坡及种植有两种灌木植物的土质边坡根-土复合体的抗剪强度参数，应用极限平衡法分析根系作用下不同坡度对土质边坡稳定性的影响。试验和算例分析表明：种植有四翅滨藜和柠条锦鸡儿两种灌木植物的土质边坡稳定系数提高值均随坡度的增大而减小，且种植灌木四翅滨藜的边坡较种植柠条锦鸡儿的边坡稳定系数提高值要大。当边坡坡度在25°～50°之间时，种植有两种植被的土质边坡稳定性增大值约在1.38～0.80之间；而当坡度超过55°时，边坡稳定性随坡度变化平缓，基本为一限值。
봉부적초본급관목식물근계가방지지표수토류실병증가천층파체은정성。위료정양화분석재불동파도조건하，유식피방호적토질변파은정성변화특정，채용실내불고결불배수삼축압축시험，측정청해성동부황토구토질변파급충식유량충관목식물적토질변파근-토복합체적항전강도삼수，응용겁한평형법분석근계작용하불동파도대토질변파은정성적영향。시험화산례분석표명：충식유사시빈려화저조금계인량충관목식물적토질변파은정계수제고치균수파도적증대이감소，차충식관목사시빈려적변파교충식저조금계인적변파은정계수제고치요대。당변파파도재25°～50°지간시，충식유량충식피적토질변파은정성증대치약재1.38～0.80지간；이당파도초과55°시，변파은정성수파도변화평완，기본위일한치。
Abundant herbaceous and shrub roots play an important role in preventing water and soil erosion and increasing shal ow slope stability. In order to make a quantitative analysis on the contribution of root system to slope stability under dif-ferent slope gradient, an unconsolidated and undrained triaxial compression test was conducted to measure the shear strengths of soil and root-soil composite in the two slopes in eastern Qinghai Province. In addition, under the protection of plant roots, the effect of gradient on stability of soil slope was investigated by limit equilibrium method. The results showed that the stability coefficient of soil slope planted with two kinds of brush was decreased with the increase in slope gradient, and the sta-bility coefficient increment of soil slope containing Atriplex canescens roots was higher than that containing Caragana korshinski roots. When the slope gradient ranged from 25° to 50° , the stability coefficient of soil slope planted with Atriplex canescens or Caragana korshinski ranged from 0.80 to 1.38. However, when the slope gradient exceeded 55° , the increment of stability coefficient of soil slope be-came smal .