关键词: 台阶下沉, 分段函数, 概率积分法, 下沉系数

Abstract: Aiming at characters of complex geologic condition on metal mines and its changeful mineral configuration, and in combination with the advantage of no-need correct on mined-out area under polar coordinates about calculating math model for surface subsidence, the math model with polar coordinates based on the theory of probability integral is introduced. Through analyzing the character of non-continue movement and deformation of sidestep subsidence in mining, and the mechanics of the overburden failure, it is concluded that the coefficient of surface subsidence is the subsection function for predicting the exploration of metal mines. It can fully explain the phenomenon of sidestep subsidence and non-continue movement and deformation, and provide a basis for further research on the surface damage character and rules during metal minerals mining. So it has a guiding meaning for on-site project.

Key words: subsidence, Subsection function, Probability integral method, Subsidence coefficient