Spalling strength of rock under different static pre-confining pressures

作者：Li Xibing; Ming Tao^*; Wu Chengqing; Kun Du; Wu Qiuhong

来源：International Journal of Impact Engineering, 2017, 99: 69-74.

DOI：10.1016/j.ijimpeng.2016.10.001

• Hopkinson bar
• Spalling strength
• Confining pressure
• Laser detector system

A testing method of spalling strength at different static pre-confining pressure is proposed in this paper. Using a modified split Hopkinson bar facility, a static pre-confining pressure was loaded before dynamic loading. The pull-back method is used to calculate the spalling strength and the free surface velocities of the specimen were measured by a laser detector system. The experimental results indicate that the spalling strength is related to the static pre-confining pressures. When the impact loading and rate effect are almost the same, the results demonstrated that the spalling strength decreases with an increase in the confining pressure.

• 出版日期2017-1
• 单位中南大学