Water proof effect of ancient weathering crust based on water resisting property indexes of fractal theory
In view of the water hazard threat of Ordovician limestone karst in the complex structure areas of the North China type coal fields,in the water bursting coefficient evaluation method and grouting reconstruction(reinforcement)treatment technology,the water resisting property of the ancient weathering crust on the Ordovician limestone roofs is not considered.Hence,we studied the physical characteristics of the ancient weathering crust on the top of the Ordovician limestone and put forward water resisting property indexes method of fractal theory to evaluate the impermeability property of paleo-weathering crust.We created an evaluation process for the application in the southern study area of Fengfeng mining area.The results show that the weak and relatively weak water resisting areas of the paleo-weathering crust in the study area are distributed in strips in the middle and southwest of the mine field.The strong and relatively strong water resisting areas are distributed in the northern and southern boundaries of the mine field,and other areas have medium water resisting property.This method can effectively reduce the number of descriptions of structural elements in the traditional evaluation methods,and can also quantitatively evaluate the complexity of fault network.It has a theoretical significance for the study of the water resisting property of the ancient weathering crust in the North China type coalfields.
physical characteristicsfractal theorywater resisting property index methodthe ancient weathering crustwater resisting property evaluationstructure
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