Loading History Effect on Stress Relaxation of Rock Joints

In this study, a data analysis method for the relaxation test was proposed under step loading by conducting creep and stress relaxation tests of dentate discontinuity poured by cement mortar using biaxial creep machine under step loading and single-stage loading. First, a superposition method for th...

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Autores principales:	Guanghui Tian, Weijian Liu, Haohao Ma, Qingzhao Zhang
Formato:	article
Lenguaje:	EN
Publicado:	Hindawi Limited 2021
Materias:	Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/6e907c1dc4714c5b8b3a35ca0f43ea1d
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spelling	oai:doaj.org-article:6e907c1dc4714c5b8b3a35ca0f43ea1d2021-11-29T00:55:57ZLoading History Effect on Stress Relaxation of Rock Joints1687-809410.1155/2021/9891973https://doaj.org/article/6e907c1dc4714c5b8b3a35ca0f43ea1d2021-01-01T00:00:00Zhttp://dx.doi.org/10.1155/2021/9891973https://doaj.org/toc/1687-8094In this study, a data analysis method for the relaxation test was proposed under step loading by conducting creep and stress relaxation tests of dentate discontinuity poured by cement mortar using biaxial creep machine under step loading and single-stage loading. First, a superposition method for the stress relaxation curve was deduced based on the data processing method of creep test by considering the effect of loading history on the relaxation curve and the characteristic of relaxation was analyzed. Second, this superposition method was verified by testing data under step loading and single-stage loading. Finally, this paper indicate the accurate way for the processing of relaxation test data under step loading. The results show that under the same stress level, the values of relaxation curve after the superposition are different from that under the single-stage loading test. Furthermore, the relaxation curves in the step loading test under different stress levels are similar to those in single-stage loading under the same stress level. Furthermore, creep deformation increase monotonically during the creep, but stress do not exhibit such a trend during relaxation, which is inconsistent with the Boltzmann superposition principle. The relaxation curve in the step loading test under different shear stress could reflect the relaxation properties of the single-stage loading test under the same shear stress, and unlike the data processing method of step loading creep test, superimposition is not needed.Guanghui TianWeijian LiuHaohao MaQingzhao ZhangHindawi LimitedarticleEngineering (General). Civil engineering (General)TA1-2040ENAdvances in Civil Engineering, Vol 2021 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	Engineering (General). Civil engineering (General) TA1-2040 Guanghui Tian Weijian Liu Haohao Ma Qingzhao Zhang Loading History Effect on Stress Relaxation of Rock Joints
description	In this study, a data analysis method for the relaxation test was proposed under step loading by conducting creep and stress relaxation tests of dentate discontinuity poured by cement mortar using biaxial creep machine under step loading and single-stage loading. First, a superposition method for the stress relaxation curve was deduced based on the data processing method of creep test by considering the effect of loading history on the relaxation curve and the characteristic of relaxation was analyzed. Second, this superposition method was verified by testing data under step loading and single-stage loading. Finally, this paper indicate the accurate way for the processing of relaxation test data under step loading. The results show that under the same stress level, the values of relaxation curve after the superposition are different from that under the single-stage loading test. Furthermore, the relaxation curves in the step loading test under different stress levels are similar to those in single-stage loading under the same stress level. Furthermore, creep deformation increase monotonically during the creep, but stress do not exhibit such a trend during relaxation, which is inconsistent with the Boltzmann superposition principle. The relaxation curve in the step loading test under different shear stress could reflect the relaxation properties of the single-stage loading test under the same shear stress, and unlike the data processing method of step loading creep test, superimposition is not needed.
format	article
author	Guanghui Tian Weijian Liu Haohao Ma Qingzhao Zhang
author_facet	Guanghui Tian Weijian Liu Haohao Ma Qingzhao Zhang
author_sort	Guanghui Tian
title	Loading History Effect on Stress Relaxation of Rock Joints
title_short	Loading History Effect on Stress Relaxation of Rock Joints
title_full	Loading History Effect on Stress Relaxation of Rock Joints
title_fullStr	Loading History Effect on Stress Relaxation of Rock Joints
title_full_unstemmed	Loading History Effect on Stress Relaxation of Rock Joints
title_sort	loading history effect on stress relaxation of rock joints
publisher	Hindawi Limited
publishDate	2021
url	https://doaj.org/article/6e907c1dc4714c5b8b3a35ca0f43ea1d
work_keys_str_mv	AT guanghuitian loadinghistoryeffectonstressrelaxationofrockjoints AT weijianliu loadinghistoryeffectonstressrelaxationofrockjoints AT haohaoma loadinghistoryeffectonstressrelaxationofrockjoints AT qingzhaozhang loadinghistoryeffectonstressrelaxationofrockjoints
_version_	1718407713518518272

Loading History Effect on Stress Relaxation of Rock Joints

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