Rock and Soil Mechanics ›› 2021, Vol. 42 ›› Issue (8): 2099-2108.doi: 10.16285/j.rsm.2021.5076

Previous Articles     Next Articles

Experimental study on the stress wave attenuation effect of filled cracks in rocks under confining pressure

LIU Xin, XU Hong-fa, FAN Peng-xian, GENG Han-sheng, MO Jia-quan, WANG De-rong   

  1. State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact, Army Engineering University of PLA, Nanjing, Jiangsu 210007, China
  • Online:2021-08-11 Published:2021-12-16
  • Contact: FAN Peng-xian, male, born in 1983, PhD, Associate Professor, research interests: rock mechanics and underground engineering. E-mail:
  • About author:LIU Xin, male, born in 1991, PhD candidate, focusing on anti-blast structure of underground cavern.
  • Supported by:
    the National Natural Science Foundation of China (51979280, 11772355) and the Natural Science Foundation of Jiangsu Province (BK20190572).

Abstract: To study the effectiveness of filled cracks as a means of anti-blasting and wave-elimination for underground protective structures, 36 one-dimensional impact tests were carried out on the intact rock specimens and rock specimens with filled cracks using the SHPB apparatus. The transmittance, stress wave velocity and peak stress value of the specimen under different working conditions were obtained. The impacts of confining pressure level, filling thickness and filling material types on stress wave attenuation were analyzed. The results show that, with the increase of the thickness of the filled cracks, the transmittance of the specimen, stress wave velocity, and stress wave peak stress attenuate clearly. The greater the thickness of the filled crack, the smaller the transmission energy of the stress wave during the propagation process. With the increase of confining pressure, the wave- eliminating effect of filled cracks is reduced due to the closure of pores, but still demonstrate stress wave attenuation effect to some extent. Therefore, using particles with higher compressive strength as crack-filling material and increasing filling thickness can effectively improve the wave-eliminating effect in engineering protection.

Key words: filled cracks, confining pressure, SHPB, stress wave, attenuation