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从复合材料的角度,提出了一种新的根系固土护坡的作用机理。即把含根土体看成由根和土组成的复合材料,根系犹如乱向分布的纤维,通过分析根系阻裂增加土体强度和延性的作用,来说明根系的固坡作用。根系对土体的阻裂增强作用表现为:在微裂缝扩展阶段,根系主要通过改变微裂纹扩展路径增大裂缝扩展的能量耗散,来提高复合土体的抗剪能力;在塑性裂缝扩展阶段,根系主要通过扩散和转移土体中的剪应力,来提高复合土体的抗剪强度,此阶段强度提高的幅度相对较大。根系增加土体延性的作用表现为:根系扩散和转移了土体中的部分应力,应变相对均匀,延缓破裂面的出现;加之,根系的抗拉、阻隔作用,复合土体的峰值强度跌落为残余强度的程度趋缓,土体的延性提高。最后,通过试验对其进行验证。
From the perspective of composite materials, a new mechanism of action of root-fixing slope is proposed. That is, the root-bearing soil is regarded as a composite material composed of roots and soils, and the roots are like randomly distributed fibers. By analyzing the effect of root crack resistance to increase the strength and ductility of the soil mass, the solid-slope effect of the root system is illustrated. In the microcrack expansion stage, the root system enhances the shear resistance of the composite soil mainly by changing the energy dissipation of the microcrack expansion path to increase the crack propagation. In the stage of the expansion of the plastic fracture , The root system mainly enhances the shear strength of the composite soil by diffusing and transferring the shear stress in the soil, and the magnitude of the strength improvement at this stage is relatively large. Roots to increase the ductility of the soil showed that: the root system to diffuse and transfer part of the soil stress, strain is relatively uniform, delaying the emergence of rupture surface; In addition, the root tensile, barrier effect, the composite soil peak intensity drop The degree of residual strength slowed down, and the ductility of soil increased. Finally, it is verified by experiment.