Research And Application Of Borehole Rescue System In Wangjialing Coal Mine

In view of problems exposed during the application of emergency refuge system in mine, such as big cost, the borehole rescue system was carried out based on the technology of emergency refuge and drilling rescue. The basic theory and key technology of the system were studied, including rescue borehole and lifting equipment. The borehole rescue system was applicated in Wangjialing coal mine, and a field experiment was conducted.The basic theory, such as composition, principle of construction, applicable conditions, was discussed, based on the research of theories and limitations of emergency refuge system. The composition of the system was determined, including refuge facilities, such as self-rescuer, transition station, refuge chamber, and rescue facilities, such as rescue borehole, lifting truck, lifting cabin, mobile supply station, which provide a new method for the rescue of mine disaster.Basic parameters and the stability of escape drill were analyzed by theory research and numerical simulation. The factors that influence the escape drill diameter and position were studied. The calculation formula of stress and strain, the method for determining parameters of allowable strength and thickness of escape drill were deduced. With the formula, the stress and strain distribution in surrounding rock of borehole, and the influence of aperture, depth and rock mass shear angle on the stress and strain of surrounding rock, were researched. The stability of escape drill was simulated by Flac3D. Finally, the implementing plan of Wangjialing mine escape borehole was put forward.With the method of theoretical calculation and experimental test, non-standard design and configuration of rescue lifting equipment, including lift truck, cabin and rope were studied. The lifting mode, function and rated lift speed of truck were determined, the structure, material and internal function of cabin were studied. The influence of wire diameter, galvanizing process on the mechanical properties of the armored structure was tested, and the structure and function of lift rope were determined.The air flow field of refuge station and rescue borehole was studied, and the influences of dirrerent working conditions, aperture and lifting velocity on the airflow distribution were analyzed, with the method of experiment and numerical simulation. The process parameters that including the time of no supply, the lowest available air, the response time and the speed of improvement was tested and the reliability of the system was verified by the field experiment of the Wangjialing Mine drilling escape rescue system.The study has widely reference value in the application and similar studies, and can provides scientific and theory basis for the formulation of related standards.