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基于大量实测信息 ,对承压水上开采煤层底板变形破坏过程中岩移、注水量 (渗透性 )等矿压显现的观测时序 ,进行Lyapunov指数的提取 ,并对其混沌性态进行了研究。实例分析表明 :煤层底板变形破坏过程中呈现出典型的混沌性态 ;另外 ,由于煤层底板渗透性指标的Lyapunov指数比岩移量指标大的多 ,表明用渗透性指标描述煤层底板变形破坏特征要比岩移量指标更敏感
Based on a large number of measured data, the Lyapunov exponent was extracted and the chaotic behavior was studied for the observed time series of rock pressure and water pressure (permeability) during the deformation and failure of coal seam floor under confined water mining. The case study shows that the deformation and failure process of coal seam floor shows the typical chaotic behavior. In addition, because the Lyapunov exponent of permeability index of coal seam floor is much larger than the index of rock displacement, it indicates that the permeability index is used to describe the deformation and failure characteristics of coal floor More sensitive than rock shift