基于颗粒流的退台式玄武岩纤维石笼河道护坡稳定性分析

Stability Analysis of River Slope Protection with Basalt Fiber Gabion on Basis of Particle Flow

为了解玄武岩纤维在石笼护坡中的应用效果,结合某玄武岩纤维石笼护坡工程,采用PFC2D软件进行双轴压缩试验标定土体细观参数,通过单轴压缩试验标定玄武岩纤维石笼细观参数,构建了原状边坡及石笼护坡颗粒流模型,并在渗流条件下进行稳定性分析。结果表明,相比原状边坡圆弧状的滑面形式,石笼支护后,石笼对边坡土体的侧限约束效果显著,坡内土体颗粒断裂的接触粘结分布均匀,土体位移呈层状分布形式且未形成贯穿滑面,网箱结构整体较为稳定,但相邻两层的石笼网箱易出现错动。

In order to understand the application effect of basalt fiber on gabion slope protection,combined with a basalt fiber gabion slope protection project,the PFC2 Dsoftware is used to calibrate the microscopic parameters of the soil through a biaxial compression test,and the microscopic parameters of the basalt fiber gabion are calibrated through a uniaxial compression test.On this basis,aparticle flow model of undisturbed slope and gabion protection was established,and stability analysis was performed under seepage conditions.Compared with the arc-shaped slip surface of the original slope,the results show that the gabion has a significant confinement effect on the slope soil after the gabion is supported,and the contact bonding of the soil particles within the slope is evenly distributed.The body displacement is in the form of layered distribution and no penetrating sliding surface is formed.The overall structure of the cage is relatively stable,but the gabion cages of two adjacent layers are prone to dislocation.