Study On Low-dilution-loss And Safety Mining Technology Of Deep Mining Transition In Daye Iron Mine

Caving mining method has been widely used in underground mines in our country. But with the underground mining depth increasing year by year, the mining ground pressure problems appearing in the mining field are more and more serious. In order to maintain the safety and stability of stope, it is necessary to transform the mining methods. With the development of deep mining, it is imperative to adopt filling mining method instead of caving mining method. Filling mining method can not only reduce many problems brought by high ground pressure, but also can achieve the goal of low-dilution-loss mining.Taking the transformation from shallow to deep mining in east section of Daye Iron mine as the background, the paper employs some methods such as theoretical analysis and numerical simulation methods to analyze the stability of transition zone of mining method and provide guidance for low-dilution-loss mining so as to ensure the smooth link of mine output and the control of mine pressure laws, thus provide guidance for overall transformation to deep mining of Daye iron mine. The main research achievements of this paper are as follows:(1) The paper elaborated on the mechanics properties of rock mass and the principle of crushing mechanism in the conditions of deep mining, and analyzed manifestation forms of mining pressure and crushing mechanism principles of rock.(2) Based on the applicable conditions of sub-level caving without sill pillar method and filling mining method, the paper analyzed the necessity, feasibility and rationality of filling mining method replacing sub-level caving without sill pillar method.(3) According to the method design in classical mechanics, the thickness of transition zone is10m, with1.3safety coefficient. By using large scale numerical calculation software FLAC3D modeling, the stress-strain condition of transition zone in the mining process were analogy studied and the stress-strain changing rules of mining stope during the process of filling mining were analyzed, as well as the feasibility of safety and thickness of transition zone was verified.(4) Based on different objective functions and their related constraints conditions, the real-time ore matching system of mining method transition was developed by adopting the programming language C#, which is of profound guiding significance to low-dilution-loss mining and ore engineering during the process of deep mining transition of Daye iron mine.