Research On Control Technology Of West Pingzhuang Open Pit And Underground Cooperated Mining

The task of mine production is the exploitation of underground coal resources, according to conditions of coal seam it can be divided into open-pit mining and underground mining. Since the open pit and underground mining induced rock movement, stress and the formation of the exploitation of space, the production of the mine will produce mutual influence, when the two mining areas is near, the open-pit mining and underground mining is bound to influence each other, Therefore, in the space of two mining methods need to scientifically determine a safe distance from the border in time to control the mining sequence, how to coordinate the two types of exploitation of the mine plan, mining relations, to ensure mine safety in the mining areas of major technical problems need to be resolved .In this paper, based on the research of open pit and underground cooperated mining technology and methods. The three-dimensional model which include Topographic and geologic, open pit, roadway of underground mining is established, then coal face, open pit and underground mining data are integrated to discribe the spatial open and underground mining visual image to describe the open pit mining system development and well working relationship between spatial relationship Intuitively.By theoretical calculations, numerical simulation and similar material simulation, the stress state, overburden strata movement and excavate effect have been researched during the open pit and underground cooperated mining. The stress state and displacement characteristic of slope of open pit mining, the slope failure mechanisms at open pit and underground cooperated mining are demonstrate, and the safety distance between open pit and underground mine are determined. Based on the displacement and stress monistor of slope and surface, disformation characteristic and failure law of top slope at open pit and underground cooperated mining have been revealed.Then mining plan and security technology measures have drew up, and the service life of open pit and underground cooperated mining has been extended. It makes a important guarantee for western Pingzhuang open pit and 4th shaft of Wujia mine and has made significant economic benefits.