Meikuang Anquan (May 2024)
Present situation of support technology and equipment in fully mechanized mining face with supermining height
Abstract
One-time full-thickness mining with ultra-high mining height has the characteristics of high mining efficiency and high resource recovery rate. In order to explore the further breakthrough of ultra-high mining height fully mechanized mining technology and analyze the feasibility of surrounding rock stability control of its working face, on the basis of investigating the development process of ultra-high fully mechanized mining, this paper summarizes the surrounding rock pressure behavior and coal wall fragmentation law of ultra-high mining height fully mechanized mining working face, and analyzes the overall technical characteristics and applicable performance of the existing ultra-high hydraulic support, the paper also introduces the basic situation of the hydraulic support in the 10 m super-large mining height working face. Through analysis, it is found that the apparent strength of the rock pressure in the working face is basically positively correlated with the mining height. The greater the mining height, the greater the support resistance of the working face, and the coal wall spalling is one of the main factors that hinder the efficient promotion of the super-large mining height mining. The stress of the coal wall can be effectively reduced by improving the initial support capacity of the hydraulic support in the working face; the hydraulic support increases with the mining height of the working face, the selection resistance increases, the support center distance is widened, and the large gradient transition mode can effectively improve the resource recovery rate of the end zone while providing reliable support; in order to adapt to the transportation of large volume mining equipment, the working resistance of the advanced support increases with the increase of the cross section of the trench in the super high mining face; the supporting hydraulic support of the working face is optimized and upgraded through design means, overall structure, manufacturing process and other aspects to improve reliability and adaptability; relative to the support of the working face with lower mining height, the mining with super mining height pays more attention to the safety technical requirements in the support process, and needs to improve the safety measures such as coal gangue protection before the frame, dust prevention and dust reduction between the frames, and safety maintenance and inspection at the later stage; it is considered that the surrounding rock stability control and its supporting equipment of the working face are the key points for the development and promotion of the super-large mining height fully mechanized mining technology. The full life development of the super-large mining height hydraulic support from the selection of support parameters, the design of support structure, the manufacture of hydraulic support, and the later maintenance and inspection is the basis for supporting the efficient promotion of the super-large mining height mining.
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