摘要
基于野外调查和室内试验,该文运用非线性有限元法分析了坡度和坡长对刺槐林边坡稳定性的影响。结果表明:①刺槐林边坡的最大主应力等值线随深度增加而增加,边坡顶部的拉应力范围较素土边坡减小;随坡度和坡长增加,边坡顶部的拉应力值和拉应力范围增加,坡脚处的剪应力增加。②随坡度增加,坡脚剪应力集中带的最大剪应力值增加,边坡顶部的应力水平变化梯度增加。③随坡长增加,边坡顶部应力水平变化梯度较大的范围增加。④根系可以将边坡的应力向土层深部传递,弱化根系层应力,提高边坡的稳定性。
Based on the field investigation and indoor lab tests,a series of numerical simulations were conducted using the non-linear finite-element method to analyze the influence of slope angle and slope length on the stability of Robinia pseudoacacia forest slope.Results prove that the maximum principal stress isoline of the slope increases with the slope depth.The range of tensile stress on top of the slope is smaller than that of pure soil slope.The tensile stress value and tensile stress range on top of the slope,the shearing stress on toe of the slope increase with the slope angle and slope length.The maximum shearing stress value of shearing stress concentration zone on toe of the slope,the varying gradients of stress level on top of the slope increase with the slope length.Forest root system an transfer the stress of superficial soil to the deep,reduce the stress of superficial layer soil,and improve the slope stability.
出处
《北京林业大学学报》
CAS
CSCD
北大核心
2008年第S2期228-233,共6页
Journal of Beijing Forestry University
基金
国家自然科学基金项目(30571531)
“973”国家重大基础研究计划项目(2002CB111502)
关键词
刺槐
根系
有限元法
边坡
稳定性
Robinia pseudoacacia
root system
finite-element method(FEM)
side slope
stability
