| Mining on the top of water-pressured, the water-irruption in coal floor is a complex nonequilibrium and nonlinear evolution process which is affected by many factors. It was stress and the interaction between seepage. So,the floor water-inrush process of research and development is in a new stage. Solid-liquid coupling theory for coal seam in the process of floor water-irruption research provides a new way.The paper basing on the results of previous studies, first of all, analysis of water inrush from coal floor of the main factors, which are including mining stress, confined water pressure of aquifer, geological structures, floor fracture and its development level, etc. Secondly, this paper describes the basic theory of coupler on the interaction of stress and seepage. The key is the interaction behavior between stress field and seepage field. Finally, using multi-physics Numerical simulation software, we were achieved the coupled of Stress and seepage fields, The main contents include:(1)Without the action of water pressure, viewing the stress changes and floor displacement changes of advancing the mining influence on complete rock bottom.(2)Under different high water pressure(2MPa-5Mpa), viewing the floor displacement changes of advancing the process of mining influence on complete rock bottom. The key simulation result is the max water pressure of bottom bearing in advancing the process under the different pressure. Water-inrush criterion is used in advancing the process to determine whether the occurrence of water-inrush floor strata.(3)Under different high water pressure, containing the fissure floor rock were studied respectively by numerical simulation:contained the single set of cracks and three groups of fractures. Also, single set of cracks with crack length is divided into two cases for the 5m and 10m. Infering the degree of development of cracks on the floor promots great role in water inrush.Figure:[46]; Table:[4]; Reference:[60]... |
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