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Author (up) Godio, A.; Seccatore, J. pdf  doi
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  Title Measuring the Reduction of the Confinement along the Evolution of a Burn Cut Type
  Year 2019 Publication Applied Sciences-Basel Abbreviated Journal Appl. Sci.-Basel  
  Volume 9 Issue 23 Pages 17 pp  
  Keywords blasting; vibrations; burn cut  
  Abstract We provide an analysis of a tunnel opening cut in a tunnel face. In particular, we focus on the effect of a “burn cut,” which is a typical parallel hole cut. As the evolution of the opening consists of an increase in the volume of the cut prism and the consequent reduction of confinement of the holes along the initiation sequence, we analyze such an evolution using photographic documentation, as well as evaluating the reduction of confinement by measuring the energy transferred from the explosive charge to the rock mass. The energy was estimated by monitoring and analyzing the vibrations induced by the blasting at three different points. We adopted low-cost shock sensors for monitoring the effect of the detonation times at short distance from the blast (about 10 m). The results show an evident reduction of the shock transfer to the rock mass (i.e., a reduction of confinement) with the increase of the cavity opening. Nevertheless, when only the response of the piezometric sensors was considered, a disparity in behavior among the sensors was noted. On the other hand, when the sensor response was integrated over time, the behavior of all sensors normalized, showing the need to focus both on the oscillation and the duration to properly address the shock effect.  
  Address [Godio, Alberto] Politecn Torino, DIATI, I-10133 Turin, Italy, Email: alberto.godio@polito.it;  
  Corporate Author Thesis  
  Publisher Mdpi Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 2076-3417 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000509476600035 Approved  
  Call Number UAI @ eduardo.moreno @ Serial 1096  
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