摘要
为最大程度地提高边坡稳定性, 选用多花木蓝和紫色土的根-土复合体为研究对象, 设置了60 cm3含根量分别为0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8 g共9个梯度对多花木蓝根-土复合体进行了直剪试验。结果表明多花木蓝根-土复合体服从摩尔-库伦强度破坏准则, 且含根试样的抗剪强度均大于无根系试样, 说明根系的加入增加了土体的抗剪切强度;在法向应力不变的情况下, 根-土复合体的抗剪强度随着试样含根量的增加而呈现先增大后减小的趋势;在60 cm3含根量为0.3～0.5 g的区间内存在一最优值, 使得多花木蓝根-土复合体的抗剪强度出现最大值。通过试验研究, 探讨了不同含根量对土体抗剪强度的影响, 对三峡库区紫色土稳定性维持以及库区边坡生态修复工程提供了一定的参考。
Abstract
To improve slope stability, the influence of root content in soil on the shear strength of soil is researched. Indigofera amblyantha and purple soil are chosen as research objects. The shear strength of Indigofera amblyantha root-soil composite are researched in the presence of different root contents (0.0 g, 0.1 g, 0.2 g/60 cm3, 0.3 g, 0.4 g, 0.5 g, 0.6 g, 0.7 g, and 0.8 g per 60 cm3). Results show that Indigofera amblyantha root-soil composite obeys the Mohr-Coulomb strength failure criterion. The shear strength of samples with roots is larger than those without roots, which suggests that roots increase the shear strength of root-soil composite. Under the same normal stress, the shear strength increases firstly and then decreases with the increase of root content. There is an optimum value of root content between 0.3 g - 0.5 g per 60 cm3 which provides the maximum shear strength of Indigofera amblyantha root-soil composite. This research offers reference for the ecological protection of slope and purple soil stability in Three Gorges reservoir area.
关键词
边坡生态修复工程 /
根-土复合体 /
多花木蓝 /
紫色土
Key words
ecological protection engineering for slope /
root-soil composite /
Indigofera amblyantha /
purple soil
杨悦舒, 夏振尧, 肖 海, 贾凤刚, 胡莫珍, 邓 莉.
多花木蓝根-土复合体抗剪强度试验研究[J]. 长江科学院院报. 2014, 31(4): 72-76 https://doi.org/10.3969/j.issn.1001-5485.2014.04.0162014, 31(04):72-76
YANG Yue-shu, XIA Zhen-yao, XIAO Hai, JIA Feng-gang, HU Mo-zhen, DENG Li.
Experimental Research on Shear Strength ofIndigofera amblyantha Root-Soil Composite[J]. Journal of Changjiang River Scientific Research Institute. 2014, 31(4): 72-76 https://doi.org/10.3969/j.issn.1001-5485.2014.04.0162014, 31(04):72-76
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参考文献
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基金
“十二五”国家科技支撑计划项目(2012BAC06B02-04);国家自然科学基金项目(41202250);三峡大学土木与建筑学院优秀硕士学位论文培育项目资助(PY201312)
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