不同根系方位及径级下草本植物根土复合体抗剪强度试验研究

本文选取中国过渡带北侧山地土壤与莎草科植物(针薹草)开展植物根-土复合体抗剪强度试验研究,分析不同根系方位及径级下草本植物根-土复合体抗剪强度增强作用以及抗剪强度指标变化规律。试验结果表明：相同法向应力下, 根-土复合体试样的抗剪强度随着方位角度的增大而逐渐增加,且当方位角θ=90°时即垂直布根时,根-土复合体试样的抗剪强度达到最大；根-土复合体试样的抗剪强度随着径级的增加而逐渐增大；随着根系方位角的增加,根-土复合体试样的粘聚力逐渐增大；相同方位角时,随着根系径级的增加,根-土复合体试样的粘聚力亦逐渐增大；根-土复合体内摩擦角与根系径级和方位影响不大且规律性不明显。

Experimental Study on Shear Strength of Herbal Root-Soil Composites Under Different Root Angle and Diameters

By taking the soil and sedge family plants in the north side of north-south transition zone of china as the research object, the shear strength of herbal root-soil composites were researched. The strengthening effects of the herbal root-soil composites and the variation of shear strength index were analyzed by using laboratory test. The results show that the shear strength of root-soil composites increased with the root angle increasing under the same conditions. When the roots were vertically distributed , the study found that the shear strength of root-soil composites was the highest. The shear strength of root-soil composites increased with the root diameter increasing.The cohesion of root-soil composites increased with the root angle and root diameter increasing. The friction angle of root-soil composites exhibits almost no variation with root angle and diameters increasing.