穿沙公路边坡植被根系固土力学特征比较研究  

Comparative Study on Soil Fixation Mechanical Characteristics of Slope Vegetation Root in Desert-crossing Highway

作　　者：李东彪 朱磊 LI Dongbiao;ZHU Lei(CCCC Nanjing Traffic Engineering Management Co.,Ltd.,Nanjing 211800,China;Tunnel Maintenance Technology Research&Development Center of CCCC Infrastructure Maintenance Group Co.,Ltd.,Nanjing 211800,China)

机构地区：[1]中交南京交通工程管理有限公司,南京211800 [2]中交基础设施养护集团有限公司隧道养护技术研发中心,南京211800

出　　处：《路基工程》2022年第1期8-13,共6页Subgrade Engineering

基　　金：内蒙古交通运输科技项目(NJ201823)。

摘　　要：以库布齐沙漠穿沙公路边坡防护常用灌木沙柳、柠条和油蒿根系为研究对象,通过野外定位采样及室内力学试验,研究3种灌木根系的固土力学特征,对根系形态及力学指标进行测定。结果表明:3种灌木根系抗拉力与抗折力均随根径增大呈幂函数增长,抗拉强度和抗折强度均随根径增大呈幂函数减小,种间差异显著;从单根力学角度评价,柠条各指标均优于沙柳和油蒿,能够对边坡土体提供更有效的刚性支撑,而从整株抗剪角度评价,沙柳具有最好的根系形态指标和提高土体抗剪强度的能力,能够对边坡土体提供更大的黏聚力。因此,在穿沙公路边坡的侵蚀防控中,柠条和沙柳可以作为复合配置模式进行植被建设,从而实现边坡的多方位生态防护。Taking the root systems of Salix cheilophila,Caragana korshinskii and Artemisia ordosica,which are commonly used in slope protection of the desert-crossing highway in Kubuqi Desert as the research object,through field location sampling and indoor mechanical test,the soil fixation mechanical characteristics of the thrss shrubs were studied,and the root morphology and mechanical indexes were measured.The result shows that the root tensile resistance and breaking resistance of the three shrubs increased with the increase of root diameter in a power function,while the tensile strength and breaking strength decreased in a power function with the increase of root diameter,with significant differences among species.From the perspective of single root mechanics,caragana microphylla could provide more effective rigid support to slope soil than salix mongolica and artemisia ordosica because it has better indicators at every aspect.From the perspective of shear resistance,salix mongolica has the best root morphology index and the ability to improve the shear strength of soil,which could provide greater cohesion to slope soil.Therefore,in the erosion prevention and control of sand-crossing highway slope,caragana microphylla and salix mongolica can be used as a composite configuration mode for vegetation construction,so as to realize multi-directional ecological protection of the slope.

关 键 词：穿沙公路 生态防护 根-土复合体 根系 材料力学特性 

分 类 号：U416.166[交通运输工程—道路与铁道工程]