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Application of Presplit Blasting Technology in Letan Hydropower

LU De-sheng, TANG Zhan-zuo(Guangxi Hydroelectric Construction Bureau, Nanning 530001, China)  
Considering the large foundation excavation quantity and tight time schedule, as well as the deep down excavation near the existing plant site, the presplit blasting is regarded as the key factor in speeding up the construction progress and ensuring the project safety and quality. The appropriate blasting parameters are defined through presplit testing to apply to the vertical presplit blasting for the high slope and the horizontal presplit blasting for foundation surface in the project. The result is satisfactory.
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