Transmission and Frequency Characteristics of Stress Waves through the Cemented Joint of Rock Mass

• Published in: IOP conference series. Earth and environmental science Vol. 570; no. 3; pp. 32014 - 32021
• Main Authors: Cui, Chunyang, Qi, Qingxin, Li, Haitao, Sun, Zhongxue
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.10.2020
• ISSN: 1755-1307; 1755-1315
• DOI: 10.1088/1755-1315/570/3/032014

During the process of rock dynamic fracture, the rock mass releases a huge amount of fracture energy, which primarily transforms into a strong stress wave; the stress wave can cause serious damage to the neighboring zones when passing through the structural rock medium. In this study, the transmission and frequency features of the stress wave through cemented joints are investigated. The polyurethane (PU) is chosen as the cementing material to glue the cut faces of the rock sample. The bonding stiffness of joints is adjusted by the mixing proportion of the polyurethane diluent. By conducting the Split Hopkinson Pressure Bar (SHPB) test, the effect of the stiffness and thickness of the PU adhesive layer is studied by monitoring the coefficients of reflection, transmission, and dissipation, as well as the frequency components. The testing results indicate that the transmission effect increases significantly, whereas the dissipation decreases with the growth of the bonding stiffness. The increasing impact energy results in a higher degree of body fracture and crack density. The low-pass filtering (LPF) effect of the stress wave is observed evidently in low bonding stiffness.