散粒体斜坡颗粒摩擦破坏机制研究综述

A Review on the Mechanism of Friction Failure of Granular Slope Particulate

散粒体斜坡在工程中发育广泛,其致灾模式具有明显链式、复发性、突发性等特征,因而近些年对其研究得到广泛关注。本文首先对散粒体斜坡颗粒内部的摩擦作用机制进行梳理,发现散粒体斜坡颗粒间的摩擦机制同样遵循几种经典的摩擦模型,散粒体颗粒物质内部影响宏微观摩擦特性的指标主要有:宏观(密度、密实度、含水率、外荷载)和微观(材料硬度、颗粒表面粗糙度、颗粒形状、咬合);在散粒体中颗粒物的细观变形破坏方面,剪切破坏过程中,存在明显的剪切带现象,且摩擦大小决定了颗粒物质最终的破坏形态,即单面破坏或双面破坏。

Granular slope is widely developed in engineering,and its disaster modes have obvious characteristics of chain,recurrence and sudden occurrence,so its research has been widely concerned in recent years.In this paper,we first sort out the friction mechanism inside the slope particles of loose particles,and find that the friction mechanism between the slope particles of loose particles also follows several classical friction models.The main indicators affecting the macro and micro friction characteristics inside the particle matter of loose particles are as follows:Macroscopic(density,compactness,moisture content,external load)and microscopic(material hardness,particle surface roughness,particle shape,occlusion).In terms of microscopic deformation and failure of particles in granular materials,there is an obvious shear band phenomenon in the process of shear failure,and the size of friction determines the final failure form of the particulate matter,that is,single-sided failure or double-sided failure.