Goaf filling space detection method under coal mine fully mechanized caving mining process condition

The invention provides a goaf filling space detection method under a coal mine fully mechanized caving mining process condition, which comprises the following steps of: detecting the formation withina range of 20-100m by adopting a high-density electrical method, detecting the formation within a range of 100-300m by adopting a transient electromagnetic method, and obtaining a vertical grading detection result by adopting a combined apparent resistivity inversion method. According to the method, the vertical detection depth difference of a high-density electrical method and a transient electromagnetic method is considered, a combined apparent resistivity inversion method is adopted to carry out vertical grading detection on the filling space under the coal mine fully mechanized caving conditions, and cavities, cracks and the like of caving zones and fissure zones of the goaf are revealed. The method can be used for the space size and distribution condition of coal gangue particle-levelfilling so as to solve th