Loading-Rate Dependence of Rocks in Postfailure Region under Triaxial Compression
To study the loading-rate dependence of four types of rocks in the peak and postfailure regions, the alternative strain rate test method is employed in conducting triaxial compressive tests under different confining pressure and moisture conditions. An index of the loading-rate dependence in the pos...
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| Format: | Article |
| Language: | English |
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Wiley
2018-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2018/1496127 |
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| _version_ | 1832559172987650048 |
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| author | Yang Tang Seisuke Okubo Jiang Xu Hailong Zhang Shoujian Peng |
| author_facet | Yang Tang Seisuke Okubo Jiang Xu Hailong Zhang Shoujian Peng |
| author_sort | Yang Tang |
| collection | DOAJ |
| description | To study the loading-rate dependence of four types of rocks in the peak and postfailure regions, the alternative strain rate test method is employed in conducting triaxial compressive tests under different confining pressure and moisture conditions. An index of the loading-rate dependence in the postfailure region is proposed, and the effects of confining pressure and moisture condition on the index are analyzed. The reliability of the test results is verified by comparing the experimental and calculated results of stress relaxation. Following are the results. (1) The peak strength and postfailure behavior significantly depend on the loading rate. The indices (nc and nd) of the loading-rate dependence in the postfailure region obtained based on the elastic and unloading moduli show a good linear relationship. It is feasible to use nc to evaluate the loading-rate dependence of rocks in the postfailure region. (2) The loading-rate dependence of the rock strength increases with the increase in the confining pressure. The effect of confining pressure on the loading-rate dependence in the postfailure region is related to the moisture condition state. (3) Water-saturation treatment will increase the loading-rate dependence in the peak and postfailure regions, and the effect of water is greater than that of the confining pressure. (4) The experimental and calculated results of stress relaxation in the postfailure region are in good agreement, thus validating the experimental results. |
| format | Article |
| id | doaj-art-d62dc4a1d417491795201d986dc2e765 |
| institution | Kabale University |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-d62dc4a1d417491795201d986dc2e7652025-02-03T01:30:47ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422018-01-01201810.1155/2018/14961271496127Loading-Rate Dependence of Rocks in Postfailure Region under Triaxial CompressionYang Tang0Seisuke Okubo1Jiang Xu2Hailong Zhang3Shoujian Peng4State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, ChinaState Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, ChinaState Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, ChinaSchool of Civil Engineering and Architecture, Chongqing University of Arts and Sciences, Chongqing 402160, ChinaState Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, ChinaTo study the loading-rate dependence of four types of rocks in the peak and postfailure regions, the alternative strain rate test method is employed in conducting triaxial compressive tests under different confining pressure and moisture conditions. An index of the loading-rate dependence in the postfailure region is proposed, and the effects of confining pressure and moisture condition on the index are analyzed. The reliability of the test results is verified by comparing the experimental and calculated results of stress relaxation. Following are the results. (1) The peak strength and postfailure behavior significantly depend on the loading rate. The indices (nc and nd) of the loading-rate dependence in the postfailure region obtained based on the elastic and unloading moduli show a good linear relationship. It is feasible to use nc to evaluate the loading-rate dependence of rocks in the postfailure region. (2) The loading-rate dependence of the rock strength increases with the increase in the confining pressure. The effect of confining pressure on the loading-rate dependence in the postfailure region is related to the moisture condition state. (3) Water-saturation treatment will increase the loading-rate dependence in the peak and postfailure regions, and the effect of water is greater than that of the confining pressure. (4) The experimental and calculated results of stress relaxation in the postfailure region are in good agreement, thus validating the experimental results.http://dx.doi.org/10.1155/2018/1496127 |
| spellingShingle | Yang Tang Seisuke Okubo Jiang Xu Hailong Zhang Shoujian Peng Loading-Rate Dependence of Rocks in Postfailure Region under Triaxial Compression Advances in Materials Science and Engineering |
| title | Loading-Rate Dependence of Rocks in Postfailure Region under Triaxial Compression |
| title_full | Loading-Rate Dependence of Rocks in Postfailure Region under Triaxial Compression |
| title_fullStr | Loading-Rate Dependence of Rocks in Postfailure Region under Triaxial Compression |
| title_full_unstemmed | Loading-Rate Dependence of Rocks in Postfailure Region under Triaxial Compression |
| title_short | Loading-Rate Dependence of Rocks in Postfailure Region under Triaxial Compression |
| title_sort | loading rate dependence of rocks in postfailure region under triaxial compression |
| url | http://dx.doi.org/10.1155/2018/1496127 |
| work_keys_str_mv | AT yangtang loadingratedependenceofrocksinpostfailureregionundertriaxialcompression AT seisukeokubo loadingratedependenceofrocksinpostfailureregionundertriaxialcompression AT jiangxu loadingratedependenceofrocksinpostfailureregionundertriaxialcompression AT hailongzhang loadingratedependenceofrocksinpostfailureregionundertriaxialcompression AT shoujianpeng loadingratedependenceofrocksinpostfailureregionundertriaxialcompression |