Numerical Simulation Study On Water Inrush Risk Of Buried Faults In Xin'an Coal Seam Floor

Concealed seam floor water inrush is one of the main hazards seriously affect the safety of China's coal resources mining. Water conditions, pressure and lead ore mine water inrush of water channels are the basic conditions. Thesis takes Xin'an coalfield No.?1 coal mining as an object of study, around the bottom buried faults due to damage induced by mining water inrush and a study.First of all, by analyzing a large number of water inrush sorting data, summed affect water inrush six factors, namely water aquifers, confined water pressure, bottom impermeable layer characteristics, geological structure, underground pressure and the stress.Secondly, the characteristics of deep karst aquifers studied that deep rich karst permeability and water depth increased with the law are weakened; and coal karst conducted a study that coal within the Ordovician limestone Formation group launched Sec potentially water-filled water a coal mine when the second. One of the important factors inducing pressure is mine water inrush, the paper starting with the regional tectonic stress field angle summarized, followed by the use of the next three with the theory of plate stress state coalfield were analyzed and summarized the factors causing pressure behavior of mine. For hydrogeological and engineering geological features within Xin'an coalfield Austrian limestone aquifer proposed Xin'an coalfield water inrush two basic types, namely cut coal inrush of water and buried fault type floor water bursting. Focuses on the meaning of buried faults, features a brief explanation. From the perspective of fracture mechanics were buried faults as a detailed analysis of water inrush channel that buried faults under constant pressure water activation expand overburden pressure and the influence of gravity, and calculated the damage caused by the critical seam floor water pressure.Thirdly, the use of numerical simulation simulation tools for different occurrences of buried faults water inrush conducted a comparative analysis that faulting has undergone two phases of the activation and expansion of low-angle fault high angle fault occurs more water inrush, and high angle fault zone floor damage caused greater.In addition, a schematic diagram of seepage field to indicate the location of water inrushfrom happening.Finally, containing buried faults seam floor actual situation, Xin'an coalfield floor grouting reinforcement measures adopted its processing in production.