Numerical modelling of blast-induced damage around rock tunnel using LS-DYNA
The overall goal is to develop a reliable numerical modelling process to predict blast-induced cracks in the tunnel wall and floor based on small-scale tests and earlier field investigations and then optimize the blast design of perimeter hole blasting.
The specific objectives are:
- To investigate the initiation and development process of blast-induced cracks around one single blasthole and between two blastholes, through small-scales tests and the digital image correlation (DIC) technique with 10 samples and different decoupling ratios in the first 1.5 year.
- To develop and verify the numerical modelling method and process for the blast-induced cracks based on the small-scale tests by comparing the frequency and depth of blast-induced cracks in the second year.
- To predict the blast-induced cracks in the tunnel wall and floor based on the earlier field invetigations with the developed numerical modelling process in the third year.
- To investigate the effect of different influceing factors such as in-situ stress, charge concentration, decopling ratio, spacing and burden, coupling medium(water/air), initiation timing scatter etc. on the blast-induced cracks in the tunnel wall and floor in the fouth year.
The project is funded by BeFo and the stakeholders of Swebrec.
Contact
Changping Yi
- Senior Lecturer
- 0920-491731
- changping.yi@ltu.se
- Changping Yi
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