Energy Dissipation and Electromagnetic Radiation Response of Sandstone Samples with a Pre-Existing Crack of Various Inclinations under an Impact Load

Minerals

He Tian¹  Xiaoliang Li¹  Xin Zhang¹  Zesheng Zang¹  Zhonghui Li¹  Muhammad Ali²  Yue Niu³ 

[1] National Engineering Research Center for Coal Gas Control, China University of Mining and Technology, Xuzhou 221116, China;School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China;State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China;

关键词: crack inclination;    stress waves;    energy dissipation;    EMR;    frequency analysis;    damage variable;   

DOI  :  10.3390/min11121363

来源: DOAJ

【 摘 要 】

Various primary fissures and defects are widely present in a rock mass and have a significant impact on the stability of the rock mass. We studied the influence of the crack inclination angle on the energy dissipation and electromagnetic radiation (EMR) response of sandstone under an impact load. Impact tests were conducted on red sandstone samples with different inclination angles, in addition to test energy dissipation and EMR signals. The results showed that as the energy of the stress wave increased, the energy consumption density and damage variables of the sample gradually increased, and the electromagnetic radiation energy also increased. As the crack inclination increased, the energy consumption density first decreased and then increased, while the damage variable and electromagnetic radiation energy first increased and then decreased. In the process of impact damage, the main frequency of EMR was 0~5 kHz. As the energy of the stress wave increased, the dominant frequency band of the main frequency expanded from low frequency to high frequency, and the amplitude signal gradually increased; the α = 45° specimen frequency domain was the widest, and the amplitude was the largest. The crack inclination significantly changed the failure state of the sample, resulting in changes in the energy dissipation and the electromagnetic radiation response of the sample.

【 授权许可】

Unknown