小乔木根系根土间作用力的室外拉拔试验研究

王桂尧; 胡圣辉; 张永杰; 陈曙; 沙琳川; 杨闻达

小乔木根系根土间作用力的室外拉拔试验研究

基金项目:

国家自然科学基金项目资助(51178063，51578082)；湖南省交通科技计划项目资助(201514)

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出版历程
- 收稿日期: 2017-06-03
- 修回日期: 2017-07-13

An outdoor drawing test study of the root soil interaction force for a small tree root system

WANGGuiyao,

摘要

摘要: 小乔木根系在边坡生态防护中具有相当高的比例，研究土壤贫瘠小乔木根系的护坡机理及影响因素，对进一步提高或改进边坡生态防护技术具有理论和实际意义。在综合国内外相关研究成果的基础上，通过室外拉拔试验研究了红黏土边坡湿地松根系在大气降雨、含水率、根系几何参数等变动情况下根系对坡面土体加固能力的影响。试验结果表明强降雨条件下，表层土体的含水率大于深层土体的含水率，含根土体含水率大于素土含水率，表明小乔木根系有助于坡面土的雨水入渗；最大拉拔力随含水率的增加表现为单调递减或在最优含水率附近最大的先增大后减小的趋势，两者间为二次函数的关系；最大拉拔力随根系体积的增加总体表现单调递增，但在含水率为22%和24%时，最大拉拔力随根系体积的增加先减小后增大；植物根系在不同体积或含水率下，拉拔力-位移曲线波动较大。
- 小乔木根系 /
- 根土间作用力 /
- 拉拔试验 /
- 雨水影响
Abstract: Small trees have a very high proportion in slope ecological protection. A study of the mechanism of slope protection and influence factors of a small tree root system are of important theoretical and practical significance for further improvement of the slope protection technology. On the basis of domestic and foreign research achievements, the influence of moisture content and root geometric parameters on the strengthening ability of slope soil is examined by the outdoor drawing experiment in red clay ground with the pinus elliottii root system. The results show that moisture content of the surface soil is greater than that in the deep soil after heavy rainfall condition and moisture content of the root soil is less than that in the nature soil. It is found that the small tree root system helps the water to infiltrate in the slope. The maximum drawing force increases first and then decreases with the increasing moisture content as the trend of the quadratic function; the maximum drawing force increases monotonically with the increasing root volume over all the performance, but when moisture content is 22% and 24%，the maximum drawing force decreases first and then increases with the increasing root volume. The pullout force displacement curve fluctuates greatly under different volume or moisture content of the plant root.
- small tree root system /
- root soil interaction force /
- drawing test /
- rain affect

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参考文献(13)

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