关键词: 滚石运动特征;物理试验;离散元模拟;合壁津高速公路;

Abstract: The research on the motion characteristics of rockfall is an essential vital premise to preventing and controlling the disaster of rockfall. Furthermore, both the covering layer of the slope surface and the rockfall characteristics are essential factors that affect the motion characteristics. Taking the material of the slope covering layer as a variable, a physical test was conducted to study the motion characteristics of rockfall on the concrete slope and soil slope. On this basis, taking the slope of the Hechuan-Bishan-Jiangjin Expressway as an example, the numerical simulation study of the motion characteristics of rockfall was carried out. The influence of the shape and size of the rockfall on the movement process was analyzed by considering the velocity, rotation velocity, and kinetic energy as indicators. The results showed that the shape and size significantly influence the motion characteristics of the rockfall. The closer to a ball-likely shape and the smaller size, the greater the movement speed and rotation speed. More than 30% of the potential energy of the rockfall was lost during the collision, which should be considered in the rockfall stone control project. The rotational kinetic energy of the rockfall only accounted for 1/30~1/10 of the total kinetic energy, so the rotating process of rockfall was generally not considered separately. The research results can provide reference for the design and optimization of the rockfall prevention project.

Key words: rockfall motion characteristics; physical modelling experiment; discrete element simulation; Hechuan-Bishan-Jiangjin Expressway