Effect of load frequency and amplitude of displacement on soft synthetic rock joints under cyclic shear loads

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68145535%3A_____%2F24%3A00598852" target="_blank" >RIV/68145535:_____/24:00598852 - isvavai.cz</a>

Výsledek na webu

<a href="https://link.springer.com/article/10.1007/s10064-024-03864-x" target="_blank" >https://link.springer.com/article/10.1007/s10064-024-03864-x</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10064-024-03864-x" target="_blank" >10.1007/s10064-024-03864-x</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Effect of load frequency and amplitude of displacement on soft synthetic rock joints under cyclic shear loads

Popis výsledku v původním jazyce

If dynamic loads propagate in the rock mass, they can generate vibrations or cyclic movements along the joints with different frequency and displacement. Hence, evaluation of rock joints behaviour under different cyclic movements significantly contributes to increasing the safety and stability of rock mass. In this study a series of cyclic shear tests was conducted on soft synthetic rock joints (with asperity angle of 30 degrees- 30 degrees) by shear apparatus to investigate the effects of shear load frequency and amplitude of displacement on the joint. Varying load frequencies (0.01, 0.05 and 0.1 Hz,) and displacement amplitudes (+/- 4, +/- 6, and +/- 8 mm) for the three different normal stresses (0.1, 0.5 and 1 MPa) were applied. The results indicated that the first peak shear stress on the joint was significantly affected by the frequency of cyclic shear load and the subsequent peaks of shear stress were largely influenced by the amplitude of displacement. Reduction of post peak shear stress was significant for the first cycle as the load frequency increased. For low normal stress, shear load frequency of 0.05 Hz and one-third of asperity base length as displacement were the certain values that shear mechanism changed on slopes of the joint asperities. Shear mechanism also demonstrated that asperity diminishing did not depend on load direction at high frequency. Whereas, at low frequency of loads, it depended on the direction of starting cyclic load. Comparison of shear strength envelopes indicated an opposite behaviour of the joint between load frequencies and displacement amplitudes.

Název v anglickém jazyce

Effect of load frequency and amplitude of displacement on soft synthetic rock joints under cyclic shear loads

Popis výsledku anglicky

If dynamic loads propagate in the rock mass, they can generate vibrations or cyclic movements along the joints with different frequency and displacement. Hence, evaluation of rock joints behaviour under different cyclic movements significantly contributes to increasing the safety and stability of rock mass. In this study a series of cyclic shear tests was conducted on soft synthetic rock joints (with asperity angle of 30 degrees- 30 degrees) by shear apparatus to investigate the effects of shear load frequency and amplitude of displacement on the joint. Varying load frequencies (0.01, 0.05 and 0.1 Hz,) and displacement amplitudes (+/- 4, +/- 6, and +/- 8 mm) for the three different normal stresses (0.1, 0.5 and 1 MPa) were applied. The results indicated that the first peak shear stress on the joint was significantly affected by the frequency of cyclic shear load and the subsequent peaks of shear stress were largely influenced by the amplitude of displacement. Reduction of post peak shear stress was significant for the first cycle as the load frequency increased. For low normal stress, shear load frequency of 0.05 Hz and one-third of asperity base length as displacement were the certain values that shear mechanism changed on slopes of the joint asperities. Shear mechanism also demonstrated that asperity diminishing did not depend on load direction at high frequency. Whereas, at low frequency of loads, it depended on the direction of starting cyclic load. Comparison of shear strength envelopes indicated an opposite behaviour of the joint between load frequencies and displacement amplitudes.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20701 - Environmental and geological engineering, geotechnics

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Bulletin of Engineering Geology and the Environment

ISSN

1435-9529

e-ISSN

1435-9537

Svazek periodika

83

Číslo periodika v rámci svazku

10

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

19

Strana od-do

389

Kód UT WoS článku

001307292600001

EID výsledku v databázi Scopus

2-s2.0-85203399052