Abstract
In order to predict the surface subsidence scientifically in solid filling mining, it is necessary to establish a complete subsidence prediction model and parameter system according to the evolution law of overburden structure and strata movement characteristics. Mine pressure monitoring and borehole peeping show that the overburden in solid filling mining is mainly a bending zone with relatively complete layered structure, and the overburden only develops a certain height of fault zone near the roof, without collapse. The results show that the surface subsidence pattern of solid filling mining can still be described by probability integral model, and the parameter system of the surface subsidence prediction model based on “equivalent mining height” is further discussed. Finally, the prediction model of surface subsidence established in this paper is applied to an engineering example, and good results are achieved.
Highlights
In recent years, with the development of coal mining science and technology, filling mining has become one of the important technical ways to solve the problem of coal pressure under buildings, water bodies, railways, and confined water bodies [1,2,3,4,5]
Compared with the traditional caving method, the overburden of filling mining can maintain a certain degree of integrity and continuity and will not trigger greater deformation and destruction, reducing and slowing down the surface subsidence over stope [6,7,8,9]. e roof can be controlled in filling mining by filling the mining area with solid waste such as gangue, which can effectively control surface subsidence and improve the coal recovery rate and rationally utilize solid waste [10,11,12]. e waste is not transported and stored, which is beneficial to reduce the cost and obviously reduce the surface deformation, avoiding the impact on the surface environment [13,14,15]
In order to study the law of rock pressure appearance and the law of overlying strata change under the condition of solid waste filling mining in mines, the surface movement and deformation of backfilling mining are predicted and analyzed through the field measurement of surface subsidence in backfilling mining, and the control effect of backfilling mining on overlying strata and surface is evaluated [16,17,18,19]
Summary
With the development of coal mining science and technology, filling mining has become one of the important technical ways to solve the problem of coal pressure under buildings, water bodies, railways, and confined water bodies [1,2,3,4,5]. In order to study the law of rock pressure appearance and the law of overlying strata change under the condition of solid waste filling mining in mines, the surface movement and deformation of backfilling mining are predicted and analyzed through the field measurement of surface subsidence in backfilling mining, and the control effect of backfilling mining on overlying strata and surface is evaluated [16,17,18,19]. E real-time monitoring system of borehole peeping for the stress in the filling body of gob and the crack development in the roof of gob is established to get the movement law of overlying. The observation station of surface subsidence is arranged to analyze the measured data of surface subsidence [20, 21], so as to provide data support for the prediction of surface movement and deformation model
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