Method for reducing extreme dynamic loads on rigid reinforcement conductors in shafts with warped geometry

Abstract This study examines the dynamic interaction problem within "hoisting vessel-reinforcement" systems used in vertical shafts of coal mines and ore mines with rail conductors, which operate for extended periods under challenging mining and geological conditions. Such systems typically lack roller dampers to reduce dynamic loads on the conductors. In these setups, even slight misalignments in the conductors lead to high dynamic interaction levels between the vessel and conductors, resulting in dynamic stresses within the frames of vessels or conductors, and in bracing structures that may greatly exceed fatigue crack accumulation levels in the metal of the vessel or reinforcement. This situation necessitates the development of new methods and structural solutions for reinforcement elements to secure conductors to braces and to install bracing in shaft reinforcement. The article proposes a mathematical model of the dynamics of the "vessel-reinforcement" system, which accounts for new types of brace-end embedding in shaft reinforcement with the ability to actively respond to dynamic load levels on the conductors. This approach aims to mitigate extreme load conditions by controlled adjustment of the system’s amplitude-frequency characteristics.