A New Thin Seam Backfill Mining Technology and Its Application

Hengjie Luan,Yujing Jiang,Huili Lin,Yahua Wang

doi:10.3390/en10122023

Hengjie Luan, Yujing Jiang + Show 2 more

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https://doi.org/10.3390/en10122023

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Abstract

Backfill mining is an effective way to control ground subsidence and govern gangue. To solve the problem of thin coal seam mining under villages, a new thin seam backfill mining technology was proposed. This paper investigated a reasonable proportion of filling materials by experiments, designed the filling system and introduced key technologies for thin seam working face filling. Finally, an industrial test of thin seam backfill mining technology was carried out in the C1661 working face, Beixu Coal Mine. The results show that the developed filling material meets both the pumping liquidity and strength requirements of the filling body during the early and late stages. The design and equipment selection of the paste filling system were reasonable. By using the key technologies for thin seam working face filling, the time needed for working face filling, the connection and disconnection of the filling pipeline and gob-side entry retaining were all greatly shortened. The labor intensity of the workers was reduced, and the mechanization level of the mine was improved. A fill mining length of 480 m was successfully completed. With effective roof subsidence control, the ground subsidence can be reduced, and good results can be achieved. This study can contribute to the development of backfill mining in thin coal seams.

Highlights

Coal is the most important energy resource in China and occupies an absolutely dominant position in China’s energy resources
To ensure the balance of the mine production capacity, extend the service life of the mine, and improve the recovery rate of resources, some mines must turn into coal resources with relatively difficult mining conditions, such as thin coal seams and coal seams under villages [4]
The operation of the filling system was coordinated to meet the requirements of long-term continuous operation of the filling was coordinated to meet the requirements of long-term continuous operation of the filling project

Summary

Introduction

Coal is the most important energy resource in China and occupies an absolutely dominant position in China’s energy resources. The development and utilization of coal resources have greatly promoted the development of China [1,2]. At present, the coal resources under good mining conditions, such as in shallow buried and large thickness settings, in the eastern part of China have been gradually depleted [3]. In thin coal seam mining, there are many rock tunnels, and a large amount of gangue is produced. With the exploitation of coal and gangue, the rock movement and surface subsidence will intensify [6]. In the process of mining under villages, the problems of subsidence area governance and the treatment of the relationship between the workers and peasants have caused certain economic pressure and unstable factors to the coal enterprises [7,8,9]. Filling mining technology can effectively control the overlying strata and surface subsidence, can protect the ground structures

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