V Orebody Dongxiang Copper Mine Deep Mining Roof Control Technology Research

Process of metal underground mining, stope roof stability is mine normal, efficient recovery of the premise. This paper dongxiang copper mine stope roof stability V ore body for the study, using theoretical analysis, indoor test and numerical simulation methods to influence the stability factor of roof to carry on the thorough analysis, The main research the following contents:1) Through to the mine material the reorganization and reference corresponding literature, and analysis the V orebody roof produce high temperature, the cause and mechanism of acid, and draw the conclusion that produce high temperature, high sulfur is the main factors and research acid high sulfur of stope of other hazards.2) V orebody in high temperature, high sulfur and water environment, the commonly used bolt anchor cable supporting or effects and durability is worth research and analysis. Research shows that the main reason for the failure of the anchor system with grouting discriminate has the very big relations, namely the stand or fall of grouting discriminate directly determine the anchor of the durability of the system. The design of the12kinds different proportion of the cement mortar, through the laboratory test, it is concluded that the water cement ratio than physical study suggested grouting influence on the performance of the law, analyses the influence mechanism. Through orthogonal design, and draw the conclusion that the ratio of secondary factors, the research of the high temperature and acidic such negative conditions on the mechanical properties of mortar influence law and extent. The test results show that:when stope roof in lower than300℃temperature surrounding rock, high temperature strength of cement mortar grouting learn properties the impact is not big, that is to anchor system the impact is not big. But the acidic environment for the influence of mechanical properties of cement mortar is very big, suggested the aperture larger anchor hole hole as grouting, increase the anchor of the mortar cover thickness steel.3) To support the roof bolt anchor supporting commonly used method, and summarizes the roof stability principle and mechanism of support. According to the site actual condition, we design three different supporting way, Using MIDAS/GTS numerical simulation method, and the comparison of the excavation support and not after the stope roof supporting case surrounding rock stress and displacement distribution, Draw the support can improve the displacement of surrounding rock stress and conclusion, Compared the three kinds of support method, concluded that suitable for dongxiang copper mine V orebody roof of the best support technology.