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通过重塑素土与草根加筋土的三轴渗透剪切试验,分析草根对土体渗透性和强度的影响。结果表明:渗透对素土和草根加筋土的强度均具有弱化效应,弱化幅度随水力比降的增大而提高,但围压的增大可以缓解该弱化作用;重塑素土和草根加筋土的内摩擦角随水力比降的增大变化规律不明显,而粘聚力随水力比降的增大呈明显的降低趋势;通过渗透工况下重塑素土和草根加筋土粘聚力及破坏强度的对比,得出根系的存在可以有效提高土体抵抗渗透破坏的能力;考虑渗透对草根加筋土强度破坏的临界深度随水力比降的变化关系为幂函数形式。
Through the three-axis infiltration shear test of remolded soil and grassroots reinforced soil, the influence of grass root on the permeability and strength of soil was analyzed. The results show that both infiltration on plain soil and grassroots reinforced soil have the weakening effect on the strength, the weakening amplitude increases with the increase of hydraulic pressure drop, but the confining pressure can alleviate the weakened effect; The internal friction angle of the soil with the increase of hydraulic pressure drop is not obvious, and the cohesion decreases obviously with the increase of hydraulic pressure drop ratio. Through the infiltration conditions, Cohesion and destruction strength, the conclusion is that the existence of root system can effectively improve the ability of soil resistance to infiltration and destruction; the critical depth considering the infiltration damage to grassroots reinforced soil as a function of hydraulic power is in the form of power function.