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中文摘要：
利用分离式Hopkinson压杆装置测量砂岩的动态力学特性，分析冲击过程和砂岩能量耗散过程，进一步讨论孔隙率对人造岩能量耗散的影响。试验结果表明：利用。维应力波理论得到动载下砂岩的应力-应变关系曲线，有助于在数值模拟计算中选择合适的模型和参数；山于砂岩中存在大量的缺陷（微裂隙、空洞和孔隙等），故在冲击载荷作用下具有明显的压剪破坏形式：孔隙率对冲击载荷作用下岩石能量耗散起着重要作用；在冲击载荷作用下，随着岩石孔隙率的增加，岩石耗散的能量也增加。
英文摘要：
impact experiments in sandstone were carried out with the split Hopkinson pressure bar（SHPB） apparatus. The impact process and energy dissipation were analyzed. The influence of the porosity of the rock on energy dissipation was also investigated. The stress-strain curves in sandstone of different impact velocities were obtained by the one-dimensional stress wave theory. Those curves lay foundation for numerical simulation of rock fracture under impact loading and provide help for selecting suitable model and parameters of sandstone. The damage profiles of sandstone specimen under the impact loading show that the sandstone exhibits obvious shear damage under the impact loading because sandstone is a typical porous medium containing large quantities of defects such as pores, cracks and grain boundaries at the microscale. The experimental results also indicate that rock porosity plays an important role in the energy dissipation process and the energy dissipation increases with the porosity increase of man-made rock.
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