EXPERIMENTAL STUDY OF DYNAMIC CHARACTERISTICS OF SANDSTONE UNDER ONE-DIMENSIONAL COUPLED STATIC AND DYNAMIC LOADS
(1. School of Resources and Safety Engineering，Central South University，Changsha，Hunan 410083，China；
2. Hunan Key Lab of Resources Exploitation and Hazard Control for Deep Metal Mines，Central South University，Changsha，
Hunan 410083，China；3. Rock Mechanics Laboratory，Swiss Federal Institute of Technology Lausanne(EPFL)，Lausanne CH–1015，Switzerland)
Abstract：Based on the scientific understanding of deep rock under high in-situ stress and dynamic excavation disturbance，the experiments on dynamic failure characteristics of sandstone under one-dimensional coupled static and dynamic loads were conducted with a modified split Hopkinson pressure bar(SHPB). Four cases，without axial pre-compressive stress and with three levels of axial pre-compressive stress，were designed to conduct impact tests under different strain rates. The results show that，at the same strain rate，the dynamic response of rock is influenced obviously by axial pre-compressive stress ratio. When the strain rate is a constant，the impact compressive strength first increases and then decreases as the axial static pre-stress increases；and it reaches the maximum value when the axial pre-compressive stress ratio is 0.6～0–0.7. When the axial static pre-stress is a constant，the impact compressive strength increases with an exponential function as the strain rate increases. Within a certain range of axial pre-compressive stress ratios，the incident energy will influence the dynamic impact energy response of rock specimen；and the specimen will experience three phases of absorb energy-release energy-absorb energy when the axial compressive stress ratio increases. The transformation mechanism of dynamic strength increase，rock burst and induced fracture of rock under high in-situ stress can be explained better by the above three phases. The results can also provide a theoretical guide for the deep rock engineering practice.
宫凤强1，2，3，李夕兵1，2，刘希灵1，2，ZHAO J3. 一维动静组合加载下砂岩动力学特性的试验研究[J]. 岩石力学与工程学报, 2010, 29(10): 2076-2085.
GONG Fengqiang1，2，3，LI Xibing1，2，LIU Xiling1，2，ZHAO J3. EXPERIMENTAL STUDY OF DYNAMIC CHARACTERISTICS OF SANDSTONE UNDER ONE-DIMENSIONAL COUPLED STATIC AND DYNAMIC LOADS. , 2010, 29(10): 2076-2085.
2010, Vol. 29 
