Effect Of Coal Mining Ore Of Double Level Under Complex Conditions

Mineral resources are basic conditions for the sustainable development of mines.In order to reduce the loss of mineral resources, not only to getting mining ore, also need as much as possible of all kinds of complicated geological conditions of the ore body. To guarantee the safety of the underground ore body getting, it leaves a lot of pillar to support the roof and the foot wall of surrounding rock usually. To cause no pillar on the loss of mineral resources,pick ore pillar getting working house usually. Stress concentration caused by after pillared,increased the difficulty of pillared, level pillar under the pillared and large filling body is one of the most complicated situation. It is great of significance of the filling body level pillar under pillar getting method and the effect of extraction for similar cases of pillared situation.In view of the were studied Anqing copper mine,- 520_- 640 m middle finally stope pillar getting of 5 # P. Through field geological survey and literature reading to understand mine geology and stress distribution rule. Using the theoretical analysis, numerical simulation and field monitoring means, analyzes the stability of stope and recovery effect, and the governance of empty packing scheme is proposed. Paper main research contents and conclusions are as follows:(1) It obtained the ore-bearing rock properties for general linear stress with depth relation from carrying on the brief analysis, of the mining geological conditions, rock properties,stress and so on.(2) using theoretical analysis of the sand model and Thomas model method for of filling body stability of the 5 # P recovery process on both sides of the filling body and roof can maintain the stability of the conclusion. On this condition, select the mining method for vertical deep hole # 5 P spherical cartridge mining stage chamber method(VCR). In order to ensure the mine production capacity, and puts forward the middle VCR method applying for between working done and fill mining method.(3)making the anqing copper mine mining plan into after treatment with entity modeling software SURPAC running, establish the entities and block model of ore body and wall rock and export coordinates. Using block the coordinates in FLAC3 D ore body grid model was established. Referring predecessors of surrounding rock of anqing copper mine, the ore body,the strength of filling body measurement, the ore body extraction process was simulated by FLAC3 D, the roof and in the process of 5 # P pack on either side of the chamber of the stress,displacement variation rules, verified the stability of the roof and filled in the process of extraction in the previous chapter fitness.(4) making use of elastic stress meter to monitor of the secondary stress of stope roof,the roof of the secondary stress changing rule, and verify the reliability of the simulation calculation. Using 3 d laser detection system(C- ALS) for on-site detection, # 5 P cavitythrough the cavity profile is ore body design boundary contrast, found that # 5 P did not occur on both sides of the filling body caving, proved that the dual phase VCR method under the high strength of filling body can maintain stability.(5)According to the results of simulation studies and empty area detection, It put forward the plan about the empty area at the top and bottom back filling materials adopt central filling,filling the cavity. 40 m, back filling cementing filling up 40 m. Using FLAC3 D to simulate the filling effect, after filling # 5 P pack on either side of the plastic zone and the horizontal displacement of the conclusion, to prove the effectiveness of the cementing back filling materials filling and packing.