Sliding Characteristics of Chute Waste Slag in High Steep Canyon Ecologically Sensitive Areas

Abstract

In order to address the serious ecological impacts caused by the construction of tunnel boring passages in steep and rugged canyon areas, a new method is proposed in this paper. The method rapidly transports the waste material through an elongated chute attached to the surface of the mountain. The study utilizes theoretical analysis, field experiments, and numerical simulations to investigate the sliding characteristics of an elongated chute that effectively handles waste slag. The results of the study show that: (1) the sliding velocity of the waste slag from the bottom opening of the chute increases gradually as the particle size of the waste slag increases. For slag with a particle size of 10-20 cm, the coefficient of friction ranged from 0.09 to 0.23, with an average of 0.16. (2) The sliding velocity of the slag is inversely proportional to the length and angle of the herringbone structure of the chute. (3) As the spacing of the herringbone baffles in the chute increases, the forces on the individual baffle structures gradually increase. The difference in the combined forces acting on the baffles also gradually increases in the 100-meter passages before and after the chute.

Keywords: high steep water rapid canyon, Ecologically Sensitive Area, chute waste slag, sliding characteristics, Numerical simulation