Finite Element Numerical Simulation Analysis Of Stability Of Stope Of Jinchangyu

The resource of gold mine is abundance which widely distributes in our country. But with the increasingly mining and consuming of geologic resource, the scale and depth of ore deposit or single industrial orebody is not only smaller and smaller but also complicated and changeful. Seventy percent of gold mine is got by underground mining. Presently, the quantity of methods of mining in main mines is about 20, one of which is room pillar mining. Jinchangyu Gold Mine, one of large scale gold mine, from which is put into production in 1958, through many years mining, not only the mining depth is deeper and deeper, but also the conditions of existing of deep orebody is changed greatly. At the same time, with the conditions of deep geology becoming complicated, the aggravation of the stability of adjoining rock, increase of ground stress, and the intensity of ground pressure, the questions of rock mechanics of mine appears more and more important. The selection of mining method is based on the stability of orebody and adjoining rock, so the data about rock mechanics should be reflected in the selection of mining method.With the increase of mining depth, the mining method of room pillar, in which room and pillar is used together, is introduced in Jinchangyu. Some of famous mine in which room pillar is used, such as Jidekelike Mine in Canada, Mangteaisa Mine in Australia, Fankou mine of lead and zinc In China, etc. are all the types. The point of this method is the division of mine block into rooms and pillars and before the finish of recovery of room, these pillars must be stable without failure. For the purpose of successful application of this kind of mining method in Jinchangyu, the sequence of stoping will be systematically studied in this thesis by the commercial software ANSYS using 3-D elastic and plastic finite element. The recovery of room is carried out in three projects in which the stoping of orebody are realized from both sides to middle, from one side to another and from middle to both sides. The difference of sequence of recovery, which differently loads adjoining rock and pillars, leads to the stress and scope and extent of damage of pillar differently. Therefore, the extent of stability of adjoining rock is affected by the sequence of stoping, which is dynamic mechanical quality of engineer stoping. As a result it is necessary to study dynamic mechanical quality of stoping to get optimum stoping techinics, which makes the damage scale of pillar smallest and insures the stability of stope. Simultaneously, the fracture belt impact of stope stability and the damage process of pillar will be explored.