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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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2021/9891973 |
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| _version_ | 1832566620564750336 |
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| author | Guanghui Tian Weijian Liu Haohao Ma Qingzhao Zhang |
| author_facet | Guanghui Tian Weijian Liu Haohao Ma Qingzhao Zhang |
| author_sort | Guanghui Tian |
| collection | DOAJ |
| 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 |
| id | doaj-art-6e907c1dc4714c5b8b3a35ca0f43ea1d |
| institution | Kabale University |
| issn | 1687-8094 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-6e907c1dc4714c5b8b3a35ca0f43ea1d2025-02-03T01:03:41ZengWileyAdvances in Civil Engineering1687-80942021-01-01202110.1155/2021/9891973Loading History Effect on Stress Relaxation of Rock JointsGuanghui Tian0Weijian Liu1Haohao Ma2Qingzhao Zhang3The School of of Architecture and EngineeringThe School of of Architecture and EngineeringThe School of of Architecture and EngineeringDepartment of Geotechnical EngineeringIn 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.http://dx.doi.org/10.1155/2021/9891973 |
| spellingShingle | Guanghui Tian Weijian Liu Haohao Ma Qingzhao Zhang Loading History Effect on Stress Relaxation of Rock Joints Advances in Civil Engineering |
| title | 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_short | Loading History Effect on Stress Relaxation of Rock Joints |
| title_sort | loading history effect on stress relaxation of rock joints |
| url | http://dx.doi.org/10.1155/2021/9891973 |
| work_keys_str_mv | AT guanghuitian loadinghistoryeffectonstressrelaxationofrockjoints AT weijianliu loadinghistoryeffectonstressrelaxationofrockjoints AT haohaoma loadinghistoryeffectonstressrelaxationofrockjoints AT qingzhaozhang loadinghistoryeffectonstressrelaxationofrockjoints |