| In the early, the mine which utilize open-stope method stoping will leave over plenty of goaf after years of exploration. It will cause the ground collapse, rockbust and bring serious menace to mine safety production. Therefore, accurately predicate the rockburst tendentiousness of deposit mining surrounding rock and to control mined-out area in safety economy, achieve prophylaxis and treatment synchronization between rockburst and gap, guarantee sustainable exploitation is an important technical question which need to solve imminently for the mine which have rockburst tendency and a plenty of mined-out area.In this paper, we use a Lead-Zinc Mine as engineering project. The means like field investigation, Field monitoring, Field monitoring, orthogonal test and numerical modeling are applied to proceed the rockburst tendentiousness judge and the optimization study of the Cemented Filling-jamb height in methods and multifaceted. The main research contents and achievements include:(1) Investigate the condition of the rockburst at work site. Collect 6 major kinds of surrounding rock. Carry out mechanical parameters test, use “Hoek-Brown” criterion to discount mechanical parameter. Then the mechanical parameter will be the exact initial value work for subsequent calculate and analyze.(2) Through test and calculation, five kinds of rockburst tendentiousness index value were obtained, such as Elastic energy index “WET”, impact energy index “WCF”, effective impact energy index “W”, Brittleness coefficient “K” and maximum reserve elastic strain energy index “Es”. Let these five kinds of index value do arithmetic summate to put forward rockburst tendentiousness comprehensive judgment index “R” which can accurately judge rockburst tendency of rocks.(3) Propose rockburst and gap govern in synchronous. Exchange the present mining method to sublevel open-stope succeed by fill. After stoping the standard ore block, apply cemented tailings backfill in 1:4 filling some height, formed consolidated filling pillar, then adopt all of cemented fill in 1:10. In order to guarantee safety and sustainable stoping.(4) Analysis obtained the main influence factors of the Cemented Filling-jamb height are the span “ l ”, the load of upper structure “ q ”, the volume-weight of backfill “ g ”, the internal friction angle “j ” and the cohesion “ c ”. Utilizing the numerical modeling orthogonal experiment elicit the Cemented Filling-jamb height with span and internal friction angle emerging the relationship of the nonlinearity positive correlation increasing function, which with cohesion emerge nonlinearity negative correlation decreasing function relation, which with load of upper structure have linear positive correlation increasing function relation. And it nearly make no difference with the change of volume-weight.(5) Through the regression analysis, established the mathematics prediction model which represent the Cemented Filling-jamb height under the multi-factor effect. This model will have some universality and have reference value to other similar engineering.(6) Combining with field practical, choose the profile which use the 43 th,45th,49 th exploration lines from 3-6# orebody to establish two types of numerical simulation model. It shows that the method of filling in the light of forecast height can ensure safety of the mine no matter in the course of stoping or after finished filling. All of these proved, the proposed mathematics prediction model which about the Cemented backfill pillar height under multi-factor influence is accurate and reasonable. |
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