Abstract
Abstract This article analyzes the technical difficulties in full-section backfill mining and briefly introduces the technical principle and advantages of backfilling combined with caving fully mechanized mining (BCCFM). To reveal the strata behavior law of the BCCFM workface, this work establishes a three-dimensional numerical model and designs a simulation method by dynamically updating the modulus parameter of the filling body. By the analysis of numerical simulation, the following conclusions about strata behavior of the BCCFM workface were drawn. (1) The strata behavior of the BCCFM workface shows significant nonsymmetrical characteristics, and the pressure in the caving section is higher than that in the backfilling section. φ has the greatest influence on the backfilling section and the least influence on the caving section. C has a significant influence on the range of abutment pressure in the backfilling section. (2) There exits the transition area with strong mine pressure of the BCCFM workface. φ and C have significant effect on the degree of pressure concentration but little effect on the influence range of strong mine pressure in the transition area. (3) Under different conditions, the influence range of strong mine pressure is all less than 6 m. This article puts forward a control strategy of mine pressure in the transition area, which is appropriately improving the strength of the transition hydraulic support within the influence range (6 m) in the transition area according to the pressure concentration coefficient. The field measurement value of Ji15-31010 workface was consistent with numerical simulation, which verifies the reliability of control strategy of the BCCFM workface.
Highlights
As the main energy source, coal has made a great contribution to socioeconomic development in China
(1) The strata behavior of the backfilling combined with caving fully mechanized mining (BCCFM) workface shows significant nonsymmetrical characteristics, and the pressure in the caving section is higher than that in the backfilling section. φ has the greatest influence on the backfilling section and the least influence on the caving section
In the transition area where the backfilling section and the caving section influence with each other, the strata behavior will be more complex, which was the key of mine pressure control in the BCCFM workface
Summary
As the main energy source, coal has made a great contribution to socioeconomic development in China. Aiming at the engineering problems in Pingdingshan No. coal mine such as large discharge quantity of protective layer gangue, no accumulation space on ground, and insufficient production capacity, some scholars put forward a new partial backfilling mining method, namely, backfilling combined with caving fully mechanized mining (BCCFM) [13,14,15,16,17]. As a new partial backfilling method, the research on BCCFM mainly focuses on system layout and mining craft, while there are few studies on strata behavior and ground control of BCCFM. In the transition area where the backfilling section and the caving section influence with each other, the strata behavior will be more complex, which was the key of mine pressure control in the BCCFM workface.
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