护坡植物的生态性能及根系力学性能

Study on the Ecological and Mechanical Properties of Root System of Slope-protecting Plants

通过建立三个坡度(37°、45°、53°)的生态护坡模型,观测各坡度下4年期护坡植物的各项生态指标,并采用抗拉试验测定4年期护坡植物根系的抗拉强度,与2年期护坡植物根系抗拉强度进行对比分析,研究4年期护坡植物的生态性能及边坡坡度、植物龄期对护坡植物根系的力学性能的影响。研究结果表明:4年期护坡模型生态稳定性良好,边坡坡度越缓,边坡水土保持效果及植物生长状态越好;边坡坡度对根系抗拉强度无明显影响;同一直径下,4年期根系抗拉强度比2年期根系抗拉强度大30~40MPa;同一龄期下,根系抗拉强度与直径成显著的幂函数递减关系,且随着根系直径增大,4年期根系抗拉强度比2年期的根系抗拉强度降低得更快。

Through the establishment of three slopes(37°,45°,53°)ecological slope protection models,the ecological indicators of the four-year slope protection plants under each slope were observed.The root resistance of the four-year slope protection plants was determined by tensile test.The tensile strength of roots of slope protection plants in 4 years and 2 years were compared and analyzed,to study the ecological performance of the four-year slope protection plant and the effect of slope and plant age on the mechanical properties of slope protection plant roots.The results show that the 4-year slope protection model has good ecological stability;the larger the slope is,the thinner the soil layer is as well as the worse the growing state of the plant is.Slope has no significant effect on root tensile strength.At the same diameter,the tensile strength of 4-year roots is 30~40Mpa higher than that of 2-year roots.At the same age,there is a significant power function decreasing relationship between root tensile strength and diameter.With the increase of root diameter,the tensile strength of 4-year roots decreases faster than that of 2-year roots.