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Iron ore bodies Jinshandian mining methods hard to Review

Conditions of view, it is suitable for block caving mine small lots, it is difficult to promote the use of that. 2) Sublevel Caving of this method is a mature domestic iron ore mining law to Jinshandian Iron is also accumulated a lot of production technology and management experience. Dig this approach is that relatively large mining, ore dilution loss rate was higher in the roadway in the powder ore step practical difficulties do not exist. According to recent years, domestic hard ore bodies (such as Zhangjiawa iron ore, iron ore jade depression) Sublevel caving method of research results. And red peach Yangjiaba iron ore mine in the unstable segment with experience, if in the future continue to sum up the experience Jinshandian Iron, of the segment height increases to l2 ~ 15m, the approach distance increased to 1l ~ 13m. Optimize drilling, shipping technology, applications Sublevel Caving is a great prospect 3) Sublevel Caving specific conditions for Jinshandian to say, this approach focused on the mining law of the two shortcomings, and from Table 3 the actual test (inspection) mining index, the description is appropriate to adopt. Fifth, the main measures in recent years, China has more than l0 ore bodies or ore block is difficult to use Sublevel caving. Gradually increased production of these mines, ore dilution loss index gradually improved, dig J992 No. 2 slot design and soup plate set 5 mines production ratio gradually declined, with the effect of getting better. The main measures are: 1) application of stope blasting excavation blasting effect approach can improve the stability of approaches, to help reduce damage to the wall approaches the range of about 20 to 30, is conducive to effective support. 2) The combined support puffanchor. Approach used friction bolt joint tube (tube grouting) or cement composite friction bolting, may play a role in quick time. With support pressure in the unstable sections of roadway, additional expansion in the long wedge bolt to form a combination of the length of anchor bolting wire spray, to improve the support rigidity, limiting deformation of surrounding rock is too large advantage, and strong roadway signs of pressure activities, timely 25U retractable metal stents secondary support, first just after the soft, supple just finished units, to better adapt the deformation characteristics of the roadway, so that the high pressure area in the roadway to maintain a solid 3 ) millisecond blasting with large holes to prevent hole deformation. Fragments of fine ore mine in the lot, due to the small diameter hole (5l ~ 58ram), hole is blocked, please move, the explosives can not be fitted to the bottom of the hole, often after blasting. Suspended roof. Using submersible drilling rig (or hole car) hit big B0 ~ 1lOmm), sub-paragraph ● ~ 5 micro-Chu blasting with both hands. The largest segment of total drug dose of 1 / 3 to 1 / 4, shock was 60 to 75, to basically eliminate the charge is not into the hole, eyebrow line damage, suspended the top and so on. 4) According to adopt the characteristics of ground pressure. Adjust the mining sequence. (1) optimize the tunnel construction sequence, grading excavation, grading support, instability in the lot to keep up with the temporary support; (2) implementation of the approach as a unit of mining methods, and strengthen into the road excavation and mining, into the way in time rendering of pressure out of mine before the end of the approach l (3) improve the recovery order, the general said, as part of the first ore mining Heavy, solid top side of the chassis on both sides should not return to the strong lateral mining l (4) Note roadway layout Face of direction and structure of the relationship between occurrence, so that excavation of the approach is more stable} (5) adjust the layout of the stope mining standards, increase the structural parameters. Reduce the production ratio of digging. Conclusion domestic difficulties encountered in the mine ore bodies are more than l0. Jinshandian Iron is one of them. These mines are free to use as the main pillar sublevel caving mining method to the output of iron ore in Jinshandian slower growth due to mining of iron ore in addition Jinshandian difficult, but the test mining law too much, test (mining) for too long, the focus of testing is the main reason is not obvious. Box Hill store mine for many years but the test situation, experience and management level, the base surface will change in the near future, no collapse of the end of sub-clan law Gui will successfully applied to difficult mining body. ● BIBLIOGRAP (slightly) the organs spring training center teaching building was a \Xi Tan Center on Teaching Building Department in September 1991 Pat-base surface completion-r acceptance. Put into use. The project for the six concrete cabinet cherry tomato lance structure of actinides, with a total construction area of 6 marrow Omt. Mexican Eagle has a teaching, office, meeting hall and cultural activities as one of the multi-functional thin platform of comprehensive teaching building, architectural design layout is reasonable. The higher the number of planes using Rong, Wong 'juvenile work of good quality color t Kwai Bo Concept generous, three-dimensional shape to be innovative. Points received by the provincial authorities. Built by the state share of quality pick in 1991, review, identified as the base country name s fourth model works. Hunan Province is the only national housing base model home construction projects' honor. (Cheng Qiu Ming)
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