Abstract
Abstract For the comprehensive mechanised coal mining technology, the support design of the main withdrawal passage in the working face is an important link to achieve high yield and efficiency. Due to the impact of mining, the roof movement of the withdrawal passage is obvious, the displacement of the coal body will increase significantly, and it is easy to cause roof caving and serious lamination problems, and even lead to collapse accidents, which will affect the normal production of the mine. In this paper, the mining pressure development law of the main withdrawal passage support under the influence of dynamic pressure is designed, the most favourable roof failure form of the withdrawal passage is determined, and the action mechanism and applicable conditions of different mining pressure control measures are studied. The pressure appearance and stress distribution in the final mining stage of fully mechanised coal face are studied by numerical simulation. The deformation and failure characteristics and control measures of roof overburden in the last mining stage of fully mechanised coal face are analysed theoretically. Due to the fact that periodic pressure should be avoided as far as possible after the full-mechanised mining face is connected with the retracement passage, some auxiliary measures such as mining height control and forced roof blasting are put forward on this basis. The relative parameters of the main supporting forms are calculated. The main retracement of a fully mechanised working face in a coal mine channel is put forward to spread the surrounding rock grouting reinforcement, reinforcing roof, and help support and improve the bolt anchoring force, the main design retracement retracement channels in the channel near the return air along the trough for supporting reinforcing surrounding rock control optimisation measures, such as through the numerical simulation analysis, the optimisation measures for coal mine fully mechanised working face of surrounding rock is feasible. Numerical simulation results also show that the surrounding rock control of fully mechanised working face of coal mine design improvements, its main retreat channel under the roof subsidence, cribbing shrank significantly lower, and closer, to better control the deformation of surrounding rock, achieved significant effect, to ensure the safety of coal mine main retracement channel of fully mechanised working face support.
Highlights
As a major energy consumer, fossil energy occupies an important position in China’s energy structure, among which coal energy accounts for 75% of China’s fossil energy consumption
Mechanised mining face moving face is an important link in mine production, and an important determinant of mine production efficiency
Due to the loss mechanism of the main retracement channel supporting the design and mining stage at the end of the pressure control measures are of insufficient understanding
Summary
As a major energy consumer, fossil energy occupies an important position in China’s energy structure, among which coal energy accounts for 75% of China’s fossil energy consumption. In order to give full play to the superiority of fully mechanised coal mining technology and realise the maximisation of coal mining benefit, it is necessary to fully guarantee the stability and safety of the withdrawal passage. For the fully mechanised coal mining technology, the main backout passage in the working face is a necessary link and an important preparation for mine production, which is of great significance to realise safe and efficient production. In order to give full play to the technical advantages of a fully mechanised caving coal mine, so that the work efficiency and mine benefits are steadily improved, it is necessary to ensure the stability of the surrounding rock of the main withdrawal channel, make the moving face smooth and safe. Combined with the characteristics of roof breaking in the final mining stage and the numerical simulation technology of the withdrawal passage, an optimisation scheme for the support design of the withdrawal passage in the fully mechanised top-coal caving face is put forward, based on the actual geological conditions of the coal mine
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