金川二矿区水平矿层灾变失稳问题研究

This dissertation is mainly composed of seven chapters. Specifically, a preface which introduces the background and significance of the dissertation, the present state of study relating to the dissertation, the methods and frame of the study in the dissertation is presented in the first chapter. The second chapter is mainly focused on the present theories and methods about the study on the Problems of Catastrophic Destabilization which are induced by deep mining. In the third chapter, basic conditions of Jinchuan Deposit II are introduced, which include regional geological background, engineering geological conditions, in-situ stress, hydrological geological conditions, mining methods and the present state of the horizontal ole layer. The fourth chapter analysizes the problem of Catastrophic Destabilization of the horizontal ole layer with theoretical methods and gives an analytical solution of elastic foundation beam which two ends are fixed and a catastrophic model of the horizontal ole layer. With FLAC3D, the Problem of Catastrophic Destabilization is analyzed, the variation of displacement and stress of the horizontal ole layer is described, and a development of plastic zone in ore layer is given out. The contents in the sixth chapter is a preliminary design of monitoring system for the horizontal ole layer. At the end of the text, several comprehensive conclusions are given in the seventh chapter.