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OPTIMIZATION AND IMPLEMENTATION OF BLASTING PLAN FOR EXCAVATION OF ROCK BASE FOR CRANE BEAM

Duan Zheng-yu

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Abstract

In excavation of rock base for crane beam in underground room of Sanbanxi Hydropower Station,the direction,spacing and inclination of smooth blasting holes were adjusted timely according to the characteristics of geological discontinuities,the zoning and stepping excavation was used and the optimal excavation scheme and blasting parameters were determined through site tests.The self-made standard guide support was used to ensure the precision of drilled smooth blasting holes.The results of measurement show that the roughness of rock bench surface is less than 7 cm and the half-cast factor is up to 95%,the quality of formed rock bench being in (agreement) with design desire.

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What this paper is about

In excavation of rock base for crane beam in underground room of Sanbanxi Hydropower Station,the direction,spacing and inclination of smooth blasting holes were adjusted timely according to the characteristics of geological discontinuities,the zoning and stepping excavation was used and the optimal excavation scheme and blasting parameters were determined through site tests.The self-made standard guide support was used to ensure the precision of drilled smooth blasting holes.The results of measurement show that the roughness of rock bench surface is less than 7 cm and the half-cast factor is up to 95%,the quality of formed rock bench being in (agreement) with design desire.

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Available abstract

In excavation of rock base for crane beam in underground room of Sanbanxi Hydropower Station,the direction,spacing and inclination of smooth blasting holes were adjusted timely according to the characteristics of geological discontinuities,the zoning and stepping excavation was used and the optimal excavation scheme and blasting parameters were determined through site tests.The self-made standard guide support was used to ensure the precision of drilled smooth blasting holes.The results of measurement show that the roughness of rock bench surface is less than 7 cm and the half-cast factor is up to 95%,the quality of formed rock bench being in (agreement) with design desire.

Key concepts: Excavation, Rock blasting, Classification of discontinuities, Geotechnical engineering, Engineering, Base (topology), Drilling and blasting, Mining engineering

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