刺槐林造林密度对边坡稳定性的影响  

Impacts of planting density of Robinia pseudoacacia on side slope stability

作　　者：刘秀萍[1,2] 陈丽华[1] 宋维峰[3] 高振林[4] 张超波[1] 

机构地区：[1]北京林业大学水土保持与荒漠化防治教育部重点实验室 [2]中国科学院遗传与发育生物学研究所农业资源研究中心 [3]西南林学院环境科学与工程系 [4]北方工业大学建筑工程学院

出　　处：《北京林业大学学报》2008年第S2期234-239,共6页Journal of Beijing Forestry University

基　　金：国家自然科学基金项目(30571531);“973”国家重大基础研究项目(2002CB111502)

摘　　要：该文通过野外调查和室内试验分析,运用非线性有限元法分析了不同造林密度对刺槐林边坡稳定性的影响。结果表明:刺槐林边坡最大、最小主应力等值线总体上随土体深度的增加而增加,在边坡深层稳定区域位移等值线梯度变化比较均匀,变形主要发生在坡面附近,顺坡和坡顶的浅层边坡不仅具有较大的竖向位移,而且具有较大的水平位移。根系的存在改变了造林边坡应力场的分布,林木根系将表层土体的应力传递到深层,起到弱化浅层土体应力的作用,提高了边坡的稳定性。在边坡顶部和底部适当造林可以减小边坡顶部拉应力区范围和边坡底部剪应力区范围。为了充分发挥根系间土拱的作用,结合研究区气候条件和土壤条件应适当加大造林密度。Based on field investigation and lab tests,a series of numerical simulations have been made using the nonlinear finite element method to analyze effects of different planting densities on the stability of Robinia pseudoacacia forest slopes.Results showed that the maximum and minimum principal stress isolines increased with the increment of slope earth depth.The displacement isolines of stable regions in deep layers were evener,and the distortion occurred mainly in the slope surface;the shallow soil of down slope and slope top had larger vertical and horizontal displacement.Forest root systems changed the stress distribution of afforested slopes and transferred the stress of topsoil to deep layers,thus weakening the stress of upper soil layers and improving the slope stability.The finite element method analysis shows that proper afforestation on the top and toe of slopes could decrease tensile stress range on the top of slopes as well as shearing stress range on the toe of slopes.We should increase planting density appropriately in view of climate and soil conditions in the research area to bring soil arching effects into full performance.

关 键 词：刺槐 根系 有限元法 边坡 稳定性 

分 类 号：S792.27[农业科学—林木遗传育种] S714[农业科学—林学]