固体充填体与液压支架协同控顶机理研究
[Abstract]:As a typical representative of green mining technology, solid filling coal mining technology is not only in line with the important demand of national energy strategy, but also an inevitable requirement for the development of the technology itself. Based on the basic theory of solid filling coal mining and the mechanism of cooperative roof control between filling body and filling coal mining support, the mechanical properties of filling materials are tested experimentally and the field measured analysis is carried out in this paper. Based on the analysis of the structural characteristics of the support and the engineering application, the mechanical model of the cooperative roof control between the filling body and the filling coal mining hydraulic support is established by using the field measurement, theoretical analysis, simulation, numerical simulation and so on. The deflection equations of direct roof under dense and non-compact filling conditions were established and the mechanism of roof control was revealed under the condition of periodic roof pressure and hydraulic support for filling coal mining. At the same time, by constructing the three-dimensional solid model of the support, the characteristics of filling operation of the hydraulic support for filling coal mining are analyzed, and the evaluation and optimization method of the structural design scheme based on the characteristics of the filling operation are established. The analysis model of compaction forming of filling body controlled by hydraulic support for filling coal mining is established, the influencing factors of density of filling body are analyzed, the mechanism of compaction forming of filling body is revealed, and the control method of density engineering of filling body is put forward. The main achievements are as follows: (1) the difference of stress-strain characteristics between bulk filling material and dense filling material is analyzed, and the experimental test curve correction method is put forward to correct the mechanical properties of gangue filling material. The revised curve of "bulk density-elastic foundation coefficient" for gangue filling material is given. (2) the theoretical analysis model of the cooperative roof control between the filling body and the filling coal mining hydraulic support under the condition of periodic pressure roof is established. The numerical simulation analysis model of filling stope excavation, moving frame and filling dynamic circulation is constructed by using ABAQUS numerical simulation software and PRO-E simulation software, and the basic law of collaborative roof control between filling body and filling coal mining hydraulic support is revealed. That is, the hydraulic support for filling coal mining controls the subsidence of the roof in the control range, transfers the roof load to the bottom, the backfill withstands the overburden and inhibits the roof movement, and the degree of inhibition is strictly controlled by the elastic foundation coefficient of the backfill. The larger the coefficient of elastic foundation is, the smaller the overburden displacement is. (3) the connotation of filling operation characteristic of hydraulic support for filling coal mining is studied, and the evaluation mechanism of design scheme based on filling operation characteristic is established. This paper puts forward the method of optimizing the design scheme of the hydraulic support for filling coal mining. The structure of the hydraulic support for filling coal mining is constructed as a whole. "initial scheme design, design scheme optimization, evaluation index optimization, optimization scheme evaluation," The design and evaluation system of operation characteristic control. (4) the compaction forming mechanism of filling body is revealed, the analysis model of filling compaction forming is established, and the key factors influencing the density of filling body are simulated and analyzed. The functional relationship between bulk density and the main control factors such as initial bulk density of filling material, filling step distance, compaction angle and the number of tamping action is established, and the control method of density engineering for filling body is put forward.
【学位授予单位】:中国矿业大学
【学位级别】:博士
【学位授予年份】:2015
【分类号】:TD355.4;TD823.7
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