Comprehensive Technical Study On The Construction Of Mining Environment Based On Non-explosive Excavation

Based on the industrial test of the reconstruction of mined-out environment and continuous caving method with subsequent backfilling which has been carried out at Xinjiang Kalatongke copper-nickel mine,and aiming at addressing several difficulties(e.g. low productivity and complex mining process)when using underhand route cemented backfilling technology to build artificial strip columns in roof-contacted filling which will cause restriction to the implement time of efficient large drop mine in mining pit. A method has been put forward that we can utilise raise boring machine excavating in the ore body to construct mining environmental group columns to replace artifical strip columns,and eventually complete a closed artificial structure around the mining section. The innovation of this method is that it breaks conventional concepts that raise boring machine is generally used for the construction of underground mine shaft, chute, ore bin,etc.,thereby promoting the progression and advancement of mining technology. Because of the changes from traditional drilling and blasting techniques to mechanical tunneling techniques, the problems of dust pollution casued by blasting can be successfully controlled.And meanwhile,the labor intensity is highly alleviated, the efficiency of building is greatly improved and accidents are dramatically reduced.In the process of this method,the mode of artificial structure reconstruction selected will directly influences the safety of production and mining costs. Taking into Consideration the complexity and uncertainty of underground rock properties, geological environment and the construction process,the stability of artifical reconstruction group columns must be analysed along the process of mining.In this paper,further researches have been generally carrid out as follows:(1) Aiming at the digging property of rock, this paper delimited the working condition of raise boring in each rock grade based on the classification of surrounding rock stability of group pillars. Result demonstrates that in extroadinary bonanza,the working condition is average,which the grade of raise boring machine working condition is levelâ…¡B; in bonanza, the working condition is poor,which the grade of raise boring machine working condition is levelâ…¢C.(2)Based on the situation of testing topes,the concrete implementation plan of non-blasting re-constitutional mining environment technology was proposed.And according to the implementation,the application of each key technology has been described in detail.(3)The research of stability of mining environment group columns was completed though the numerical software MIDAS/GTS coupling with FLAC3D and obtained that group columns arranged along the orebody tendency through scheme optimization:in the condition of 10 group pillars(per root diameter of 2m)arranged in one or two rows in turn, can the stope structure maintain the stability of the whole.