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Abstract One time deep hole raise blasting technology is an effective way to solve raising difficulties，to speed up raise construction and reduce drivage cost. Two modes，including one time raise driving by using porous spherical charge blasting and cylinder cut blasting were introduced. In the process to select raising mode，the influencing factors which should be considered were illustrated. The technical problems about one time long hole raise blasting technology were analyzed in detail；and the corresponding technical solutions were put forward. Studies suggest that the main factors which influence the selection of mode are lithology，hole deflection，raising section and raising height. The confinement problem in one time raise driving by using porous spherical charge blasting were solved through circular arrangement of holes，unequal height stratification，setting interlayer，single layer holes? simultaneous blasting，multilayer blasting in up or down order，rational delay interval between layers and other technical measures. Four empty holes doliform cut，calculation determination of void parameters and segmented length，test determination of cut hole charging structure and blasting hole stemming length were used to solve the related parameter problems in burn cut technique. Finally，an open pit mine as the engineering background，two project examples(23 m and 32 m raises) of one time raise driving were introduced.
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Received: 31 October 2012
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2013, Vol. 32 
