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ORIGINAL RESEARCH article

Front. Earth Sci.
Sec. Geohazards and Georisks
Volume 12 - 2024 | doi: 10.3389/feart.2024.1499993
This article is part of the Research Topic Physical Properties and Mechanical Theory of Rock Materials with Defects View all 7 articles

Mechanical and Acoustic Characteristics of Interbedded Rock Samples under Cyclic Loading-Unloading Conditions

Provisionally accepted
Dong Wei Dong Wei 1,2*
  • 1 Xi`an University of Science and Technology, Xi`an, China
  • 2 Shaanxi Yanchang Petroleum (Group) Corp. Ltd, Xi'an, China

The final, formatted version of the article will be published soon.

    Abstract：This study explores the mechanical behavior and early warning signs of weak interlayered rock mass under cyclic loading and unloading conditions. Uniaxial compression and cyclic loading and unloading tests were carried out on natural rock mass and water-saturated rock mass, and the strength, deformation, failure mode and acoustic emission characteristics of the rock mass were compared. The results show that cyclic loading reduces the strength of natural rock mass, and water saturation further weakens the strength of rock mass. The strength attenuation rate of water-saturated rock mass is low, at 60.19%. The average deformation modulus of natural rock mass is 6.571 GPa, and the average deformation modulus of water-saturated rock mass is 3.646 GPa, indicating that water reduces the stiffness of rock mass. The failure modes include splitting shear under uniaxial compression and tensile shear damage under cyclic loading. Acoustic emission analysis found that during the unloading and reloading process, the rock mass has a short "step-like" silent period, and about 70% of the damage occurs in the last silent period before failure. This can be used as a prediction indicator of damage and provide a valuable reference for disaster warning in engineering applications.

    Keywords: Cyclic loading-unloading, Strength degradation, Acoustice mission, water saturation, rock mechanics

    Received: 22 Sep 2024; Accepted: 16 Dec 2024.

    Copyright: © 2024 Wei. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence: Dong Wei, Xi`an University of Science and Technology, Xi`an, China

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