Recognition of blasting wave signals and dynamics of explosion process

The explosion shock waves,stress waves and detonation gas action from the explosive waves are separated and recognized by analyzing the radial blasting wave signals tested in concrete under the decoupling charge,and their parameters are quantitatively studied.The results show that the three kinds of blasting wave act on the measuring points of concrete at the same time.The time of their individual contribution is about 3.5,3.3 and 16.6 μs,respectively.The stress of the shock wave shows itself in the compressive way,whose magnitude of the peak value stress reaches above 1000 MPa.And the stress of the stress wave shows itself in the tensile and compressive way.The detonation gas action shows itself as lasting tensile stress or compressive stress.Then the damage tests on the concrete after explosion show that the explosion has formed a damage zone with a radius of 12.5 cm around the borehole and produced 7 pieces of cracks on the surface of concrete.The damage threshold value Dcri is 0.2.The radius of the damaged zone of concrete is greater than the depth of the damaged zone.