| Deep mining is faced with a series of problems,such as the increase of gangue productivity,the decrease of lifting efficiency,and the increase of difficulty in surrounding rock control of face,roadway and chamber.The integration technology of mining,dressing and backfilling is an effective way to solve the above problems.The realization of the stability control of rock surrounding separation chambers and the optimized layout of mining and backfilling space in deep mine can not only ensure the efficient coordination of mining,dressing and backfilling systems,but also effectively improve the disaster prevention and controlcapability of mine.In this paper,the research methods of theory analyses,numerical simulations,laboratory experiments and field observations were adopted to analyze the deformation and failure characteristics of rock surrounding underground separation chamber and its influencing factors.The optimal layout and compact layout method of separation chambers were expounded,and the damage law and control measures of rock surrounding separation chambers were analyzed.The dynamic adjustment methods of layout parameters and process parameters of the mining and backfilling space were explored,and the optimal layout strategies of mining and backfilling space to meet different engineering requirements were proposed.The optimal layout decision-making methods of mining,dressing and backfilling space were discussed.The research results can provide theoretical basis and reference for long-term stability control of rock surrounding separation chambers,reasonable layout and dynamic adjustment of mining and backfilling space in deep mine.(1)The mechanical models of surrounding rock stability analysis were established according to the structural characteristics of underground separation chamber.And the response characteristics of surrounding rock deformation and failure with the values change of different influencing factors were studied.The main advantages and disadvantages,applicable conditions and equipment configuration requirements of underground coal preparation technologies at present were clarified by investigating multiple integration mines of mining,dressing and backfilling in China.The main structural characteristics of underground separation chamber were summarized.The mechanical models of the variable cross-section simply supported beam of roof,the cylinder on both sides and overhanging beam of floor were established respectively.The deformation and failure characteristics rock surrounding separation chamber and its main influencing factors were analyzed.The control variate method was applied to study the response characteristics of surrounding rock deformation and failure with the changes of different influencing factors.The countermeasures of optimal layout and surrounding rock control of the separation chamber were analyzed.(2)The optimized layout and compact layout method of underground separation chambers were expounded,and the damage laws and control measures of rock surrounding separation chambers were analyzed.The influences of section shape,size effect and excavation method on the surrounding rock stability of separation chambers were studied.The reasonable layouts of separation chambers with the changes of the thickness and position of weak stratum were revealed,and the optimal layouts of separation chambers in different types of in-situ stress fields were determined.The principles and methods of compact layout of the separation chambers were discussed.The "three shells" cooperative support technology for surrounding rock control of separation chambers was proposed.The damage laws of rock surrounding separation chambers under the coupling effect of high crustal stress and mining induced stress,vibration load and impact load were revealed.And the reinforcement countermeasures of surrounding rock in the service period of separation chambers were analyzed.(3)The dynamic adjustment methods of layout parameters and process parameters of the mining and backfilling space were explored,and the optimal layout strategies of mining and backfilling space to meet different engineering requirements were proposed.The layout method of mining and backfilling space suitable for deep integrated mine of mining,dressing and backfilling was discussed.The main factors affecting the layout of mining and backfilling space were analyzed,and the weight of each influencing factor was determined based on the Delphi analytic hierarchy process.According to the coordination requirements of mining and backfilling and the two limited conditions of "determining the backfilling by mining" and "determining the mining by backfilling",the reasonable matching relationships and dynamic adjustment methods of layout parameters and process parameters of the mining and backfilling space were explored.The optimal layout strategies of mining and backfilling space were put forward,which is suitable for surface subsidence control,rock burst prevention,gob-side entry retaining,gas prevention and water-preserved-mining.(4)The mutual feedback linkage laws of layout of the mining,dressing and backfilling space were analyzed,the decision-making methods of optimal layout of mining,dressing and backfilling space in deep mine were discussed.The mutual feedback linkage laws of layout of the mining,dressing and backfilling space were analyzed according to the requirements of safe,efficient and green mining.The principles of optimal layout of the mining,dressing and backfilling space were proposed respectively based on the two limited conditions of "determining the backfilling by mining" and "determining the mining by backfilling".The decision-making methods of optimal layout of mining,dressing and backfilling space were discussed.Taking Xinjulong coal mine as the specific engineering background,the layout schemes of mining,dressing and backfilling space were planned and designed.The dissertation contains 157 figures,38 tables,and 199 references. |
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