Estimation of stresses in a massive granite using laser ultra-sonic testing and stress memory effect

Ondřej Kašpar; Alexander Kravcov; Jiří Štoller; Petr Kubeček; Radovan Vnuk; Zbyněk Zušťák

doi:10.14311/AP.2023.63.0011

Authors

Ondřej Kašpar Charles University in Prague, Faculty of Science, Engineering Geology and Applied Geophysics, Albertov 6, 128 43 Prague 2, Czech Republic
Alexander Kravcov Czech Technical University in Prague, Faculty of Civil Engineering, Department of Construction Technology, Thákurova 7, 160 00 Prague, Czech Republic
Jiří Štoller University of Defence in Brno, Faculty of Military Technologies, Kounicova 65, 662 10 Brno, Czech Republic
Petr Kubeček Czech Technical University in Prague, Faculty of Civil Engineering, Department of Construction Technology, Thákurova 7, 160 00 Prague, Czech Republic
Radovan Vnuk Czech Technical University in Prague, Faculty of Civil Engineering, Department of Construction Technology, Thákurova 7, 160 00 Prague, Czech Republic
Zbyněk Zušťák Czech Technical University in Prague, Faculty of Civil Engineering, Department of Construction Technology, Thákurova 7, 160 00 Prague, Czech Republic

DOI:

https://doi.org/10.14311/AP.2023.63.0011

Keywords:

rock cores, acoustic emission, laser ultrasonic method, structure, stress state, rocks, Kaiser effect

Abstract

This paper addresses in-situ stress-estimation methods based on the Kaiser effect. The physical and mechanical properties of granite, diorite, and granodiorite samples selected at different depth intervals of the core obtained from a wellbore were examined. The ultimate uniaxial compressive strength, modulus of elasticity, and Poisson’s ratio of the rock samples were determined using presses and strain gauges. Also, local longitudinal and shear wave velocities were measured using a high-accuracy laser-ultrasonic system with a view to assessing the structure of the samples. Based on the resulting elastic wave velocity maps, samples with no obvious discontinuities were chosen. These undisturbed samples were subjected to uniaxial compression and their acoustic emission was simultaneously measured. In-situ stresses were estimated from the results of the interpretation of acoustic emission measurements. The experimental in-situ stresses were compared with the results of a numerical simulation. The ratio of the estimated in-situ stresses to the calculated ones is within the range from 0.81 to 1.11. This means that the laser ultrasonic and acoustic emission methods make it possible to effectively estimate in-situ stresses in a rock mass and assess the degree of rock mass damage.

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