Dynamic rock tests using split Hopkinson （Kolsky）bar system e A review

Dynamic properties of rocks are important in a variety of rock mechanics and rock engineering problems.Due to the transient nature of the loading, dynamic tests of rock materials are very different from andmuch more challenging than their static counterparts. Dynamic tests are usually conducted using thesplit Hopkinson bar or Kolsky bar systems, which include both split Hopkinson pressure bar （SHPB） andsplit Hopkinson tension bar （SHTB） systems. Significant progress has been made on the quantification ofvarious rock dynamic properties, owing to the advances in the experimental techniques of SHPB system.This review aims to fully describe and critically assess the detailed procedures and principles of techniquesfor dynamic rock tests using split Hopkinson bars. The history and principles of SHPB are outlined,followed by the key loading techniques that are useful for dynamic rock tests with SHPB （i.e. pulseshaping, momentum-trap and multi-axial loading techniques）. Various measurement techniques for rocktests in SHPB （i.e. X-ray micro computed tomography （CT）, laser gap gauge （LGG）, digital image correlation（DIC）, Moire method, caustics method, photoelastic coating method, dynamic infrared thermography）are then discussed. As the main objective of the review, various dynamic measurementtechniques for rocks using SHPB are described, including dynamic rock strength measurements （i.e.dynamic compression, tension, bending and shear tests）, dynamic fracture measurements （i.e. dynamicimitation and propagation fracture toughness, dynamic fracture energy and fracture velocity）, and dynamictechniques for studying the influences of temperature and pore water. 2015 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting byElsevier B.V. All rights reserved.