Dynamic damage laws of sandstone under different water bearing conditions based on nuclear magnetic resonance

CHU Fu-jiao; LIU Dun-wen; TAO Ming; PENG Huai-de

doi:10.13374/j.issn2095-9389.2018.02.003

Volume 40 Issue 2

Feb. 2018

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CHU Fu-jiao, LIU Dun-wen, TAO Ming, PENG Huai-de. Dynamic damage laws of sandstone under different water bearing conditions based on nuclear magnetic resonance[J]. Chinese Journal of Engineering, 2018, 40(2): 144-151. doi: 10.13374/j.issn2095-9389.2018.02.003

Citation:

CHU Fu-jiao, LIU Dun-wen, TAO Ming, PENG Huai-de. Dynamic damage laws of sandstone under different water bearing conditions based on nuclear magnetic resonance[J]. Chinese Journal of Engineering, 2018, 40(2): 144-151. doi: 10.13374/j.issn2095-9389.2018.02.003

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Dynamic damage laws of sandstone under different water bearing conditions based on nuclear magnetic resonance

doi: 10.13374/j.issn2095-9389.2018.02.003

1) School of Resources and Environmental Engineering, Shandong University of Technology, Zibo 255049, China
2) School of Resources and Safety Engineering, Central South University, Changsha 410083, China

Received Date: 2017-02-08

Abstract

Abstract

To study the dynamic damage characteristics of sandstone under different water bearing conditions, three different kinds of samples with different moisture states (dry, semi-saturated, and saturated) were prepared. The impact damage of the rock was tested using a split Hopkinson pressure bar (SHPB) with four values of low incident energy. The T₂ spectrum curves, porosity, and pore image of the samples were obtained by scanning the samples by nuclear magnetic resonance test. The results show the following:(1) an increase in the impact energy led to increased average strain rate and strength; (2) after impact, the porosity and porosity variation rate of every sample under different water bearing conditions increase with different amounts; (3) compared with the test before impact, T₂ spectrum curve has obvious right movement trend and large pore peaks increase. The greater the impact energy increase, more obvious the large pore peaks increased are; (4) nuclear magnetic resonance images show that the number and size of pores increase, which show the expansion and evolution of pores in the rocks.
- water bearing condition,
- dynamic damage,
- impact test,
- nuclear magnetic resonance,
- porosity,
- T₂ spectrum curves

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References(5)

References

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