黄土高原造林边坡应力应变特征及其稳定性分析  

Stress-strain characteristics and stability of forest slope in the Loess Plateau

作　　者：刘秀萍[1] 陈丽华[1] 张心平[2] 高振林[3] 宋维峰[4] 

机构地区：[1]北京林业大学水土保持学院,水土保持与荒漠化防治教育部重点实验室 [2]中国农业大学水利与土木工程学院 [3]北方工业大学建筑工程学院 [4]西南林学院环境科学与工程系

出　　处：《北京林业大学学报》2008年第5期97-103,共7页Journal of Beijing Forestry University

基　　金：国家自然科学基金项目(30571531);“973”国家重点基础项目(2002CB111502)

摘　　要：该文以刺槐林、油松林固坡为例,运用有限元方法分析刺槐和油松林边坡的应力和变形特性,探讨不同根型树种对边坡稳定性的影响。结果表明:油松能将表层土体的应力通过根系传递到深层,起到弱化浅层土体应力的作用,提高边坡的稳定性。刺槐林边坡坡脚向土体内侧存在一个位移集中带,是边坡不稳定的主要部位;在边坡偏上部出现位移集中带,最大位移也出现在边坡偏上部,是边坡变形滑动时"滑出"的位置。油松林边坡未出现上述两种情况,说明油松林显著提高了边坡的稳定性,油松根系的固土作用及增加边坡稳定性效果要好于刺槐林边坡。Taking slope protection of Robinia pseudoacacia and Pinus tabulaeformis forests for example, based on finite element method （FEM）, the stress and deformation characteristics of Robinia pseudoacacia and Pinus tabulaeformis forest slopes were studied and the effect of different root architectures on the slope stability were analyzed. Results show that Pinus tabulaeformis was capable to transfer superficial soil stress to deep soil, reduce superficial stress through root system and improve the slope stability. The concentration zone of displacement inside the slope toe of Robinia pseudoacacia plantation was the vital part of slope instability. The concentration zone and maximum displacement were on the high position of Robinia pseudoacacia forest slope and were the skid-off positions of slope distortion and glide, but they were absent on the slope of Pinus tabulaeformis forest, which indicates that Pinus tabulaeformis forest has improved the slope stability, its root- soil reinforcement and slope stability are better than Robinia pseudoacacia.

关 键 词：刺槐 油松 根系 有限元法 

分 类 号：S714.7[农业科学—林学]