根系退化对根土复合土体的影响

The Impacts of Root Degradation on Root-soil Composite Soil Mass

为探索根系自然腐烂对其自身抗拉能力及根土复合体力学性能的影响,测定了种植狗牙根的红粘土的基本物理力学性能指标,并制备狗牙根自然退化0、3、6个月情况下的重塑含根土、原状含根土试样进行三轴试验。结果表明,狗牙根根系进入退化状态后,抵抗拉力的能力随时间明显降低,退化6个月时根系已腐烂,完全不具有力学性能;退化3个月时,重塑含根土和原状含根土的抗剪强度均发生不同程度的衰减;退化6个月的根系使根土复合体降低52%左右的强度,对土体造成极大损伤。

In order to explore the impact of root natural decay on its own tensile strength and mechanical properties of root-soil composites,the mechanical performance index was performed on red clay planted with Bermudagrass.In addition,a three-axis test was performed on the remolded root soil and undisturbed root soil samples after natural degradation of Bermudagrass at 0,3 and 6 months.The results show that the root resistance of the Bermudagrass roots after entering the degenerative state was significantly decreased with time,and the root system was decomposed at the time of degraded6 months.It had no mechanical properties at all.When the roots were degraded 3 months,the shear strength of the remolded roots and the undisturbed roots show different degrees of attenuation.The roots that were degraded 6 months decreased the strength of the root composite by about 52%,this caused great damage to the soil.