Numerical Simulation Study Of Overlying Rock Formations Migration Law In Underground Mining

Human surface movement and deformation caused by excavation research starts with theresearch of underground mining. Mining subsidence theory as an important research branch ofmining industry, its research has a long history, in the study of the phenomenon of variousmining, surface subsidence caused by underground mining are main research methods:Buildlarge numbers of surface movement observatory, creating a variety of theory, put forward thevarious calculation methods, is expected to develop a large amount of calculation software,make it become more mature theories and methods. With the increase of scale and depth ofthe underground engineering excavation, underground metal mine strata movement andsurface subsidence caused by mining also brought a series of new problems. Study of rockmovement and subsidence angle values of the most important parameter is mobile angle. Intraditional design method of mining, mobile subsidence range when introducing the conceptof mobile angle of fall. Surface subsidence basin is in the process of mining working faceadvancing, scope expands unceasingly, the influence of surface subsidence value increases,the surface is formed of a much wider range than the mining subsidence basin. Fully miningconditions, the surface movement basin on the main section of the critical deformation valueof mined-out area boundary points and the connection between horizontal and lateral angle ofmined-out area called mobile angle. Selection of mobile angle problem is very complicated,on the one hand, selection of mobile angle to meet the needs of safe production, on the otherhand reduce the land area, reduce the mining cost. Therefore, how to scientifically determinethe ground surface displacement and angle of mining underground mining, is a significantresearch problem.Contoured paper using numerical simulation technology is the purpose of the study ofore Ⅱfall anomaly zone, first of all within the scope of the mining area geologicalcharacteristics, ore characteristics, hydrogeological conditions, in-depth investigation andresearch, field and indoor rock physical and mechanical properties test study, adoptingFLAC3D4.0new version of the numerical simulation software to build a simplified model, carried out in accordance with the design requirements for mining and related to thepost-processing, and comparing with the engineering analogy method, finally movingaccurately delineated, the mining area is the secretary of the iron ore Ⅱanomaly area fall ofmoving boundary scope to make scientific and reasonable evaluation, put forward reasonablesuggestions. This is that the main significance of the study: accurate secretary delineating oreⅡ anomaly area fall of moving boundaries, putan end to happen the geological disasters,avoid the surface buildings and production facilities in the mobile area and deformationdamage, can not only bring huge economic benefits, also can bring significant social benefitsand environmental benefits. Based on the research of the mining strata movement rule, caneffectively reduce the loss and ensure the safe production in mines, promote the mining areaeconomic development and social stability.