Research On The Effect Of Environment From Open-pit To Underground

As everybody knows that the excavation of any mining engineering rock mass is not to be a one-shot deal, but rather the multi-step iterating, and this is especially true for the mine with underground and surface combined. In the process of mining, it is a dynamic variation system with the load and the stress field distribution changing all the time; This paper is based on the Beijing Yunye mining of the two different types of mining with spatial relation between two kinds of mining influence domain overlapping and containing the characteristics of the study of "space attribute" of the combined mining,and obtaining the following results:(1) With the influence of mining from open-pit to underground, the open slope located in underground mining influence domain led to the part of two mining influence domain overlapping and caused the interaction and superposition and influence between two types of mining effect, thus it constituted a composite effect. Then the deformation and destruction are completely different from the single open mining. Aiming at this situation, the system made some numerical simulation about the changing with different excavating volume of overlying rock mass and the surrounding environment different in the process of open-pit to underground, and it revealed the ground movement laws of the subsidence body and determined the scope of the environmental impact of overlying rock mass.(2) According to the numerical simulation, it analyzed the stress changing of section VII-VII and determined the ground movement laws of the changing with different excavating volume of overlying rock mass in the process of open-pit to underground.(3) Application of the critical slip field method and limit equilibrium method has carried on the forecast analysis of the stability of natural slope and composite slope, and determined the corresponding coefficient of slope stability.(4) According to the geological conditions of the mining area in Miyun and surrounding environment, it determined the section VII-VII profile and the whole valley mining area of the surface defining the dangerous zone mining into underground; And in the process of shangyu mining into underground mining, it would induce natural mountain landslide of deep mining, and it is necessary to adopt corresponding prevention and control measures to achieve the goal of safe production in mining.