Study on Development Degree of Collapse Column in Changping Mine and Major Controlling Factors for Its Formation

The similar dimension of collapse column development in Changping Mine was determined by fractal theory, and according to the similar dimension size, Changping Mine was divided into owe develop area, secondary development area and extensive development area. There were three major controlling factors for forming collapse column in Changping Mine: soluble rocks, geological tectonic movement and late Mesozoic tectonic heat event. The late Mesozoic tectonic heat event makes the collapse column characteristics more developed in the west of Changping Mine than that in the east area and concentrated distribution in the syncline axis by enhancing both the runoff strength and corrosion resistance of Ordovician limestone groundwater.