Study On Synergism Of Hidden Danger Resources Mining And Goafs Treatment

Due to the affecting by the previous mining, under the interaction of secondary stress and dynamic disturbance, the hidden trouble resources affected by the goafs show some characteristics such as rock mass fragmentation, poor stability, poor obdurability, stress centralization and lots of underground watercourse and so on. Using conventional mining method mining the hidden resources, some bad phenomena appear, liking high risk, low production efficiency, most disasters and poor safety and so on. From the big system of mine, guided by mining environment reconstruction and continuous mining theory, synergism of hidden danger resources mining and goafs treatment was put forward as a new mining development mode by introducing the synergism theory. Relying on the Eleventh Five-year National Key Project of Scientific and Technical Supporting Programs Funded by Ministry of Science & Technology of China, the theoretical and technical basises and its engineering application for synergism of hidden danger resources mining and goafs treatment were studied by adopt the research line combined with various methods such as theoretical study, comprehensive analysis, empirical study and so on.(1) The theoretical system of synergism of hidden danger resources mining and goafs treatment was constructed. From recognizing the basic concept, this paper made a systematic exposition of the ideological origin, the basic concept, the significance and essential connotation of the synergism; the basic principles of goafs synergistic utilization were established; the technology system of the synergism of hidden danger resources mining and goafs treatment was constructed; from the mining technology and science, the basic modes of goafs synergistic utilization and the systematic classification were studied; the dialectical relation between goafs synergistic utilization and traditional goafs treatment methods was analyzed.(2) The synergistic effect nonlinear mechanical model of surrounding rock system of goafs was built. Based on the analysis of the engineering characters of sudden instability of surrounding rock system and the applicable nonlinear mechanical model, the mechanics model of collaborative bearing load of rock underground excavation engineering was built; The synergistic effect mechanics model of the roof of goaf and artificial partition and its deflection curve equation and catastrophe model were studied; the regulatory effect of geometric parameters and mechanics parameters of goafs synergistic utilization on the stability of surrounding rock system was studied. The studies provided the basis of mining environment reconstruction structure.(3) The process of goafs synergistic treatment and the mechanics response rules of surrounding rock system were studied. The size effect of the stability of goafs surrounding rock was studied by simplified orthogonally analysis method designing the numerical test schemes; the matching relationship between the geometric characters of goaf and synergistic utilization treatment mode was studied; the mechanics response rules of surrounding rock system under the different synergistic utilization treatment mode was analyzed and compared and some corresponding technology suggestions were given.(4) The structure disaster-causing effect of the complicated goafs group and the induced breaking chain technology were studied. Using the RFPA2D (Rock Failure Process Analysis) code, the catastrophic path and the initial failure part of three typical the goafs group structures were simulated and the structure disaster-causing effect was studied; the chain-style effect mathematics model of goafs disaster was built and the evolution law of the catastrophic chain of goafs group structure was studied; the new chain-styled stages division mode and inducing cave synergistic treatment technology schemes as the chain-cutting disaster mitigation in the headstream.(5) The empirical analysis of cataclastic ore section mining and goaf treatment was finished. Based on the analysis of engineering geology and mining technology conditions, the guiding ideologies and basic principles of the synergistic design of the cataclastic ore section mining and goaf treatment were determined. A new mining method including the goaf synergistic treatment was created; the new synergistic technology of cataclastic ore section mining and goaf treatment under single goaf or multiple goafs; based on the analysis of the stability of mining environment reconstruction structure, the reasonable height of low-grade backfill in the interval stope and the synergistic utilization problem of the surplus space.