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STUDY ON BLASTING PARAMETERS FOR PERMAFROST EXCAVATION IN THE CONSTRUCTION OF QINGHAI-TO-TIBET RAILWAY

FU Hong-xian,FENG Shu-yu,ZHANG Zhi-yi (China Academy of Railway Sciences,Beijing 100081,China)  
The blasting excavation of permafrost is a difficult problem in the construction of Qinghai-to-Tibet railway.The powder factor for the blasting excavation of permafrost was preliminarily determined through the site crater tests using spherical or column charges.On the basis of above tests,the optimal blasting parameters for excavation of the permafrost with high ice content were determined by three longhole blasting tests for cut excavation.
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