Application of microdynamic exploration in spatial distribution of gob
The large-scale exploitation and utilization of coal resources and the discharge of coal gangue in northern Shaanxi have caused a series of ecological environmental problems,such as surface subsidence,groundwater level decline,land de-sertification intensification and soil pollution.The most effective disposal method of coal gangue is underground filling.In or-der to find out the filling area of gangue in gob,taking the 112201 working face of Xiaobaodang mine as the engineering background,the gob subsidence and underground spatial distribution law are figured out using microdynamic exploration method.Based on the treatment results of transverse wave section of 5 mirodynamic measuring lines,the space of the area is restructured using interpolation method to obtain the three dimensional figure of transverse wave velocity and the sectional figure of underground spatial distribution.The development and influential range of gob are analyzed by cutting method.The results show that the intensive fracture development zone of collapse zone is at the depth of 350～400 m,and the optimal grouting area is at the depth of 350 m with the distance of 50～100 m from the two sides.In light of the development charac-teristics of the fracture zone and collapse zone,it is of grouting potential due to the considerable development of fracture when the range of depth is at 250 m.
gobunderground spaceseismic wavemicrodynamic explorationfracture development zone
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