Abstract
The dynamic damage of cracked rock threatens the stability of rock structures in rock engineering applications such as underground excavation, mineral exploration and rock slopes. In this study, the dynamic damage of cracked rock with different spatial geometry was investigated in an experimental method. Approximately 54 sandstone specimens with different numbers of joints and different filling materials were tested using the split Hopkinson pressure bar (SHPB) apparatus. The energy absorption in this process was analyzed, and the damage variable was obtained. The experimental results revealed that the dynamic damage of cracked rock is obviously influenced by the number of cracks; the larger the number, the higher the energy absorption and the bigger the dynamic damage variable. Moreover, it was observed from the dynamic compressive experiments that the energy absorption and the dynamic variable decreased with the strength and cohesion of the filling material, indicating that the filling material of crack has considerate influence on the dynamic damage of cracked rock.
Highlights
With limited land and mineral resources, mining and geotechnical engineering are continuously being developed; this development has brought increasing challenges.A large number of geological disasters have been induced by dynamic disturbance [1,2].Many studies have indicated that the dynamic damage of cracked rock bears significant adverse impacts and can lead to geological disasters
Based on one-dimensional stress wave theory, energy can be indirectly calculated according to the incident, reflected and transmitted stress wave signals obtained from the split Hopkinson pressure bar (SHPB) test
The SHPB test results demonstrate that the dynamic damage of cracked rock is obviously influenced by the geometric characteristics of cracks
Summary
With limited land and mineral resources, mining and geotechnical engineering are continuously being developed; this development has brought increasing challenges. SHPB has become a reliable high strain rate loading apparatus to measure the dynamic response of brittle materials under impact loadings. As a widely used device to quantify the dynamic properties of various brittle materials at high loading or strain rates, the SHPB system is used to study the compressive response [25,26], tensile failure [27,28,29], shear strength [30,31,32] and fracture characteristics of rocks [33,34]. The influences of the number of joints and filling material on the dynamic properties of cracked rock were tested by the split Hopkinson pressure bar (SHPB) apparatus. The energy absorption in the dynamic impact process was analyzed, and the damage variable was obtained
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