摘要
以林木根系为研究对象,将根系与土壤视为一个整体,用三轴压缩试验方法研究根土复合体的应力-应变及强度特性,探讨不同根系直径、根系分布方式、复合体含水量和围压下的极限主应力差和加根效果,得出根土复合体的强度指标。结果表明:根土复合体在含水量相同的情况下,随根径增大,复合体的强度提高率增大。水平根的根土复合体随含水量增加,复合体的强度提高率减小;垂直根和复合根的复合体随含水量增加,复合体的强度提高率增大。垂直根和复合根的根土复合体能明显提高土体的强度,水平根的根土复合体对于提高土体强度效果不是很明显。
Based on triaxial compression tests, this paper researched the stress-strain and strength characteristics of root-soil composite. The ultimate σ1 - σ3 , reinforcement and shear strength index of composite were investigated under the conditions of different root diameter, root arrangement, water content of composite and confining pressure. It was found that the strength incremental ratio of root-soil composite increased with the increasing of mot diameter when the water content of composite in the steady state. The strength incremental ratio of horizontal root-soil composite decreased with the increasing of water content, while the strength incremental ratio of vertical and complex root-soil composites increased. Except for the horizontal composite, the vertical and complex root-soil composites obviously improved soil strength.
出处
《林业科学》
EI
CAS
CSCD
北大核心
2007年第5期54-58,共5页
Scientia Silvae Sinicae
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)
关键词
三轴压缩试验
根土复合体
刺槐
强度
triaxial test
root-soil composite
Robinia pseudoacacia
strength
