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采用粗砂加细粒,配置不同细粒含量的土样,在特定边坡坡度、不同降雨强度条件下,分别进行了泥石流室内模型试验。基于不同细粒含量下边坡的破坏过程,分析边坡的宏观位移场、孔压、含水率等,研究不同降雨条件下细粒含量对泥石流形成形态的影响。研究结果表明:不同细粒含量的坡体发生泥石流时宏观破坏形态不同;在50mm/h降雨强度条件下,细粒含量为0%~10%的坡体均能发生分层滑动破坏并形成泥石流;细粒含量大于25%时,坡体破坏形态以坡面冲刷破坏为主,难以形成泥石流;在相同细粒含量下,降雨强度的变化能够显著改变坡体的破坏形态并对是否发生泥石流有重要影响;细粒含量影响坡体渗透系数,是坡体不同破坏形态的主要原因之一。
Using grit and fines, soil samples with different fine-grained contents were set up. Under the condition of specific slope gradient and different rainfall intensity, debris flow indoor model tests were carried out respectively. Based on the failure process of the slope with different fine-grained contents, the macro-displacement field, pore pressure and water cut of the slope were analyzed to study the effect of fine-grained content on the formation of debris flow under different rainfall conditions. The results show that the macroscopical failure modes of landslides with different fine-grained contents are different. Under the condition of 50mm / h rainfall intensity, the landslides with 0% ~ 10% When the content of fine particles is more than 25%, the failure mode of slope body is dominated by slope erosion, which makes it difficult to form debris flow. Under the same fine-grained content, the change of rainfall intensity can significantly change the failure mode of slope body, The influence of fine-grained content on the permeability coefficient of slope is one of the main reasons for the different failure modes of slope.