Abstract
Backfill mining has become an important part of coal mine green mining technology. In this paper, the spatiotemporal characteristics of coupling effect between the roof and dense backfill body were analyzed by theoretical analysis and similar simulation test, and Xingtai Mine in China was taken as an engineering case for verification. The results show that the larger subsidence of the roof is, the stronger the supporting capacity of the backfill body is, and the interaction between the two is more obvious, thus showing a coupling effect. This coupling effect presents a regular variation with the increase of backfill distance and time, that is, the coupling degree of roof and backfill body is high in the middle of goaf and low in the vicinity of the coal pillar in spatial distribution, and the coupling behavior of roof and backfill body continues to occur slowly with time. Through the monitoring of stress and displacement in the engineering site and the analysis of borehole observation results, the spatiotemporal coupling effect between roof subsidence and backfill support is fully verified. The research results are of great significance to the control of surrounding rock in backfill mining, the study of the mechanical aging characteristics of backfilling materials, and the optimization of backfill body support performance.
Highlights
Solid waste backfill mining technology has become an important content of green mine construction in recent years and is one of the four key technologies in the green mining technology system [1, 2]
The research on solid waste backfill mining technology mainly focuses on two major aspects: strata control theory and backfilling material mechanical properties
On the basis of comprehensive analysis of strata movement and mechanical characteristics of backfill body, Chang et al [11] established a mechanical model of rock beam in backfill mining by the theory of elastic foundation beam and analyzed the main influencing factors of strata movement and deformation; Li et al [12] established a mechanical model of backfill body and roof in solid dense backfill mining by the theory of nonlinear elastic foundation of thin plate and analyzed the deflection equation of the roof by the energy method, derived the conditions of roof breakage; Fan et al [13] proposed three
Summary
Solid waste backfill mining technology has become an important content of green mine construction in recent years and is one of the four key technologies in the green mining technology system [1, 2]. Its main method is to fill the solid waste discharged in the process of coal production and utilization, such as gangue, and fly ash, into the underground goaf to achieve the purpose of replacing coal and digesting solid waste This method plays an important role in controlling overburden deformation, reducing surface subsidence, and protecting the ecological environment [3,4,5]. The research on solid waste backfill mining technology mainly focuses on two major aspects: strata control theory and backfilling material mechanical properties. Geofluids types of structures in the overburden under the backfill conditions based on the movement law of the overlying strata and established a mechanical model to derive the theoretical formula of the main roof subsidence. The research results are of great significance to the control of surrounding rock in backfill mining, the study of the mechanical aging characteristics of backfilling materials, and the optimization of backfill body support performance
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