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- W2552865610 abstract "Underground openings can experience time-dependent deformations and stress changes. Studying time-dependent rock behaviour is commonly done with static load (creep) tests in the laboratory which typically exhibit three distinct stages of behaviour. In this study relaxation tests were conducted to examine if three stages also exist under constant strain boundary conditions and to understand how the relaxation behaviour changes as the driving stress to strength ratio is increased. Tests were conducted on two types of limestone. At different load levels similar stress-time responses were measured indicating three distinct stages of stress relaxation. The first stage of stress relaxation (RI) where the stress relaxes with a decreasing rate is followed by the second stage (RII) in which the stress decrease approaches a constant rate and in the third stage (RIII) no further stress relaxation takes place. In the first stage 55% to 95% of the total stress relaxation takes place. The test results are compared with literature data to understand the influence of the stiffness on the magnitude and time to reach the maximum stress relaxation. Relaxation tests could be used to derive numerical model inputs to describe the time-dependent behaviour in a manner similar to static load tests." @default.
- W2552865610 created "2016-11-30" @default.
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- W2552865610 date "2017-01-01" @default.
- W2552865610 modified "2023-10-03" @default.
- W2552865610 title "The three stages of stress relaxation - Observations for the time-dependent behaviour of brittle rocks based on laboratory testing" @default.
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- W2552865610 doi "https://doi.org/10.1016/j.enggeo.2016.11.010" @default.
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