A dynamic breakage system for the removal of a cylindrical concrete pile head by means of controlled blasting method using diamond shaped charge holder the hollow steel plate is experimentally and numerically examined to prove the effectiveness of hollow steel plate as a crack arrester for the purpose of minimization of the damages in the remaining part of concrete pile. In order to prove the effectiveness of hollow steel plate as a crack arrester for the purpose of minimization of the damages in the remaining part of concrete pile, blast experiments and numerical analyses were conducted by DFPA-A code. The experimental and numerical results clearly showed that the case with the steel plate resulted in better fracture pattern in which the damage in the remaining concrete pile below the steel was reduced, while the case without the steel plate resulted in significant fracturing toward remaining part of concrete pile. In order to investigate the influence of both the loading rate characterized by rise time of the applied pressure and spacing between steel plate and charge hole on the resultant fracture pattern, the laboratory-scale experiment of concrete pile head by blasting a cylindrical charge with a hollow steel plate was conducted.
dynamic fracture process analysis, rock-like material, finite element method, axisymmetric problem, Cohesive law