92 Of The Dachang Ore Body Mining Technology Research

The No.92 ore-body of DaChang lie in the under-part of the No.91orebody, and they are jointed closely, the No.92 ore-body is the main part in TongKeng Mine. Because the direct roof of the No.92 ore-body is the backfilling of the No.91orebody which is the cementing materials or non-cementing materials, and there are no-filled mined-areas in someplace. So there are large-scale hidden troubles on the top of the No.92 slowly inclined large and thick ore-body, then we must find a new mining technology which aims at the complex mining condition of the No.92 ore-body. The cutting nature of the No.92 ore-body is very poor, so choosing the rational drilling and blasting parameters and enhancing the overall technological economic benefits are also the urgent problems waiting to be solved in the exploitation of the No.92 ore-body. The No.92 ore-body, thin lodes and the exploitation process of the No.91orebody influence each other, the geo-pressure phenomena aggravates obviously in case of the mined-areas increase constantly, and the geo-pressure problem will be more and more serious when the No.92 ore-body be exploited on a large scale in the next step.Ore-body mining technology, ore-body drilling and blasting parameters and geo-pressure problem of the No.92 ore-body have been researched in this paper, and obtain the following conclusions and achievements.(1)The abducting caving method in continues mining is a new mining technology and it has many merits such as the low loss and dilution of ore, the high mechanization degree, the high stoping strength, the high worker labour productivity and high safety, and it provides a new approach for the mining in the No.92 ore-body.(2)The numerical simulation on the abducting caving method in continues mining when we use RFPA2D software indicate that the terrane has some sustainable capacity as the roof terrane has been destroyed, and it can keep the continues mining system under stability for a period, the distance between the mass falling area and the mining face can keep in the range of the scope between two working push, and this greatly reduce the possibility that loss and dilution of ore as the mullock produced by the abducting caving of the roof, then it guarantees the continues stoping technology besucceed in implementing.(3) We determine and select the QZG80 high and medium wind pressure down-hole drill produceed by Xuanhua Machine Factory Hebei province, and the aperture of the deep hole is 90 mm which is relatively suitable. We commend the mixing explosive (Heavy ANFO) evenly mixed by the ANFO and the emulsion explosive as the next explosive which used by the No.92 ore-body' exploitation.(4) As we use the 3D- a software , the counting results of the sloping process indicate that: at the striking bearing, the permutation order from kind at difference on the stability of the projects in the mining process is: (1)The backward mining method to the east from the west; (2)From the central part to the east, the west;(3)From the east, the west to the central part; (4)The advancing project from the east to the west.At the inclining bearing, the best project on the stability of the non-overlapping areas is the case from south to the north; the second is the case from the central part to the south, the north; the third is the case from the south, the north to the central part; the worst is the case from the north to the south. The best project on the stability of the overlapping areas is also the case from south to the north; the second is the case from the central part to the south, the north; the third is the case from the central part at the overlapping area to two ends in a backing method; the worst is the case which mine two sides at the non-overlapping areas in a advancing way at first, then back from the central part at the overlapping areas. The project of first mining the central part at the overlapping areas is better than one that first mining two sides at the non-overlapping areas, and the backing method is better than other projects at the overlapping areas.