Experimental study and numerical simulation on shock-damaged rock

Impact-damage experiments on limestone specimens were carried out on one-stage light-gas gun. Pressure in specimens during shock wave action process was tested by manganin gauge. Impact-damaged and fragmentation properties of lime rock were analyzed by acoustic sounding and splitting cut observation on specimens after shock experiments. Test and analyzed results show that if flyer plate diameter is smaller than that of specimen, the freedom surface of specimen is better, and colliding pressure is 1.0~1.7 GPa, specimen damage has divisional characters with different mechanisms, including head-core space, ring-shape crack area, central section damage space and empennage failure zone. Soft reclaim installation provided a good freedom surface for the side and empennage of specimens, and pull stress made the dominant function for rock damage. Impact-damaged process of rock was numerically simulated using LS-DYNA finite element code to analyze impact-damaged properties of limestone specimens and to validate experimental results.