The relationship between ultrasonic velocities and mechanical damage in sandstone under cyclic loading

Sen Yang, Shimin Liu, Hongwei Zhang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This laboratory study investigates the damage evolution of sandstone specimens under two types of cyclic loading conditions through monitoring and analyzing the variations of elastic moduli and ultrasonic velocities. We adopted the rigidity degradation method for evaluating the damage accumulation through the rock dynamic ultrasonic velocity measurements. Compared to the ultrasonic test, the method of rigidity degradation shows deficiencies in the detection of damage development. The cyclic loading within the elastic limit led to a stiffening trend for the loading process but a softening trend for unloading process. The method of rigidity degradation was unable to describe the damage accumulation in this situation, while P-wave velocity clearly reflected the damage development. Moreover, a simplified model is established for interpreting the behaviors of the modulus variations and ultrasonic velocity. The cyclic loading within elastic limit enhances the anisotropy of rock, which causes a denser packing pattern in the direction of axial stress. The persistent damage accumulation under the cycling with an increasing upper limit is the consequence of the tensile failure in the microstructure of sandstone.

Original languageEnglish (US)
Title of host publicationProceedings of the 36th International Conference on Ground Control in Mining, ICGCM 2017
EditorsMichael Murphy, Brijes Mishra, Kyle Perry, Heather Lawson
PublisherSociety for Mining, Metallurgy and Exploration (SME)
Pages172-181
Number of pages10
ISBN (Electronic)9780873354561
Publication statusPublished - Jan 1 2017
Event36th International Conference on Ground Control in Mining, ICGCM 2017 - Morgantown, United States
Duration: Jul 25 2017Jul 27 2017

Publication series

NameProceedings of the 36th International Conference on Ground Control in Mining, ICGCM 2017

Conference

Conference36th International Conference on Ground Control in Mining, ICGCM 2017
CountryUnited States
CityMorgantown
Period7/25/177/27/17

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All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology

Cite this

Yang, S., Liu, S., & Zhang, H. (2017). The relationship between ultrasonic velocities and mechanical damage in sandstone under cyclic loading. In M. Murphy, B. Mishra, K. Perry, & H. Lawson (Eds.), Proceedings of the 36th International Conference on Ground Control in Mining, ICGCM 2017 (pp. 172-181). (Proceedings of the 36th International Conference on Ground Control in Mining, ICGCM 2017). Society for Mining, Metallurgy and Exploration (SME).