Journal of Northeastern University Natural Science ›› 2017, Vol. 38 ›› Issue (9): 1330-1334.DOI: 10.12068/j.issn.1005-3026.2017.09.024

• Resources & Civil Engineering • Previous Articles     Next Articles

Study on the Stress Relaxation of Sandstone with Different Moisture Contents Caused by Dynamic Distrubance

LI Shuai, ZHU Wan-cheng, YU Yong-jun, ZHAO Long   

  1. School of Resources & Civil Engineering, Northeastern University, Shenyang 110819, China.
  • Received:2016-12-23 Revised:2016-12-23 Online:2017-09-15 Published:2017-09-08
  • Contact: ZHU Wan-cheng
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Abstract: Axial stress and strain of sandstone with different moisture content were measured by self-designed stress relaxation-dynamic disturbance testing apparatus. It is showed that there exists stress decline and strain increase after the dynamic disturbance was applied on the sandstone specimen. Effects of moisture content on the stress relaxation magnitude and level were analyzed. According to the constitutive law of rock subjected to accumulated deformation disturbance, the disturbance factors range from 2 to 6 at different moisture content conditions.The results show that ①During the stress relaxation process, the magnitude and level of stress relaxation at different time are increased due to the effect of water.The stress reduction can be enhanced by water. ②Under the same impact energy, both the strain increase and stress decrease are observed in sandstone specimen under higher moisture level. The disturbance factor increases with the increase of moisture content.

Key words: sandstone deformation, stress relaxation, dynamic disturbance, moisture content, disturbances factor

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