小乔木根系根土间作用力的室外拉拔试验研究

发布时间：2019-05-08 20:08

【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。
[Abstract]:Small tree root system has a high proportion in slope ecological protection. It is of theoretical and practical significance to study the slope protection mechanism and influencing factors of soil poor small tree root system in order to further improve or improve the slope ecological protection technology. Based on the relevant research results at home and abroad, the influence of root system on soil reinforcement capacity of red clay slope wetland was studied under the conditions of atmospheric rainfall, water content, root geometry parameters and so on through outdoor pull-out test. The results show that the water content of surface soil is greater than that of deep soil under heavy rainfall, and the water content of soil containing root is greater than that of plain soil, which indicates that the root system of small Arbor is helpful to Rain Water infiltration of soil on slope. With the increase of moisture content, the maximum drawing force shows the trend of monotone decrease or the maximum increase and then decrease near the optimal moisture content, which is the relationship of quadratic function. The maximum drawing force increased monotonously with the increase of root system volume, but at 22% and 24% moisture content, the maximum drawing force decreased at first and then increased with the increase of root system volume. The drawing force-displacement curve of plant roots fluctuated greatly under different volume or water content.
【作者单位】：长沙理工大学土木与建筑学院;
【基金】：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)
【分类号】：S718.4;TU446

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