不同围压下草本植物根系对土体加筋效应试验研究
文伟, 李艳荣, 李光范, 胡伟, 李铁, 刘惠江, 项文. 不同围压下草本植物根系对土体加筋效应试验研究[J]. 力学季刊, 2016, 37(1): 124-130. doi: 10.15959/j.cnki.0254-0053.2016.01.014
WEN Wei, LI Yan-rong, LI Guang-fan, HU Wei, LI Tie, LIU Hui-jiang, XIANG Wen. Study on the Effect of Herbaceous Plants Roots Reinforcement on Soil under the Condition of Different Confining Pressure[J]. Chinese Quarterly of Mechanics, 2016, 37(1): 124-130. doi: 10.15959/j.cnki.0254-0053.2016.01.014
Citation:WEN Wei, LI Yan-rong, LI Guang-fan, HU Wei, LI Tie, LIU Hui-jiang, XIANG Wen. Study on the Effect of Herbaceous Plants Roots Reinforcement on Soil under the Condition of Different Confining Pressure[J]. Chinese Quarterly of Mechanics, 2016, 37(1): 124-130. doi: 10.15959/j.cnki.0254-0053.2016.01.014不同围压下草本植物根系对土体加筋效应试验研究
海南大学土木建筑工程学院,海南海口,570228
海南大学土木建筑工程学院,海南海口,570228
海南大学土木建筑工程学院,海南海口,570228
海南省价格认证中心,海南海口,570203
海南大学土木建筑工程学院,海南海口,570228
海南大学土木建筑工程学院,海南海口,570228
详细信息
中图分类号:TU47
Study on the Effect of Herbaceous Plants Roots Reinforcement on Soil under the Condition of Different Confining Pressure
摘要
摘要:通过从野外直接挖取草本植物狗牙根根系,并将其与海南地区红粘土随机混合,采用一次性成样方法对根土复合体进行了多个围压下的室内常规三轴试验,其围压分别为20kPa、30kPa、40kPa、100kPa、200kPa、300kPa;对根土复合体的抗剪强度指标、加筋效果进行了分析及评价,指出了在不同围压作用下复合体抗剪强度指标的变化情况.试验数据分析可知:(1)单根狗牙根的抗拉力与直径呈正相关线性关系,而抗拉强度与直径呈衰减形幂函数形式;(2)狗牙根根系的存在可有效提高土体的抗剪强度,根土复合体的主应力差增长速度快于素土,且其应力应变曲线应变后期明显不同于素土,复合体曲线应变后期呈现应变硬化现象;(3)根土复合体的抗剪强度随围压而变化,高围压作用下土复合体的粘聚力及内摩擦角与素土相比分别提高了159.23%和13.56%,在小围压作用下的增长幅度分别为35.87%和10.86%;因此,采用大围压进行试验显得不合适宜,小围压作用下的根土复合体更加符合草本植物根系的浅层加筋作用.小围压作用下的根土复合体三轴试验研究成果对进一步开展小型边坡防治、水土保持提供了参考依据.
Abstract:By digging herbs Cynodon dactylon root directly from wild,randomly mixed with red clay of hainan area,the triaxial test had been conducted with difference confining pressure;the confining pressure arranged from 20 kPa to 40 kPa and 100 kPa to 300 kPa.The shear strength index and reinforcement effect of the root-soil composite system were analyzed and evaluated and the variation of the root-soil composite system under the different confining pressure had been pointed out.Test data analysis shows that:(1) The single tensile resistance of Cynodon dactylon was positively correlated with diameter in linear relationship.While the tensile strength was in the form of power function attenuation shape.(2) The root is beneficial of the soil.It can effectively improve the shear strength of soil and the principal stress difference growth speed than soil-soil.The complex curve displays strain hardening phenomenon in the late stage.(3) The shearing strength of the composite root-soil changes over confining pressure,the soil cohesive force and angle of internal friction increased by 159.23% and 13.56% respectively in high confining pressure,and increased by 35.87% and 10.86% respectively in the small confining pressure.So,as the confining pressure deviation from the actual,the root-soil composite system under small confining pressure were more close to reality.The results could be applied to small slope control and provide a theoretical basis for soil and water conservation.
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