Research on Acoustic Emission Characteristics and Constitutive Model of Rock Damage Evolution with Different Sizes
In this study, considering the scale effect of rock mass, the influence of different height-to-diameter ratios on rock mechanics and acoustic emission characteristics was studied by using PFC2D software. The damage constitutive model of rock was established, and the damage evolution characteristics...
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2020/6660595 |
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| _version_ | 1849467880425390080 |
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| author | Haijiang Zhang Xiaohu Zhang Hongbo Zhou |
| author_facet | Haijiang Zhang Xiaohu Zhang Hongbo Zhou |
| author_sort | Haijiang Zhang |
| collection | DOAJ |
| description | In this study, considering the scale effect of rock mass, the influence of different height-to-diameter ratios on rock mechanics and acoustic emission characteristics was studied by using PFC2D software. The damage constitutive model of rock was established, and the damage evolution characteristics of rock with different height-to-diameter ratios were further analyzed. The results showed that, with the increase of height-to-diameter ratio K, the uniaxial compressive strength and peak strain of rock exhibited a gradual decrease; however, the elastic modulus gradually increased. Moreover, rock failure modes exhibited different characteristics under different K values. The scale effect showed little influence on the acoustic emission characteristics in the elastic stage; nonetheless, in the plastic deformation stage and the residual damage stage, with the increase of the rock’s height-to-diameter ratio, the maximum number of impacts of acoustic emission increased, the range of strong strain of acoustic emission decreased, and the maximum time of acoustic emission impacts increased gradually. The height-to-diameter ratio of the rock slightly influenced the zero-damage stage of the rock, but the damage affecting the rock increased slowly and accelerated the development stage. The damage evolution law was found to be similar when the K values varied from 1.0 to 2.0; however, when the K was greater than 2.0, the damage evolution law exhibited the characteristics of slowing down in the acceleration phase. |
| format | Article |
| id | doaj-art-e68abbe1ab034d128dea59255ff455f0 |
| institution | Kabale University |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-e68abbe1ab034d128dea59255ff455f02025-08-20T03:26:00ZengWileyAdvances in Civil Engineering1687-80861687-80942020-01-01202010.1155/2020/66605956660595Research on Acoustic Emission Characteristics and Constitutive Model of Rock Damage Evolution with Different SizesHaijiang Zhang0Xiaohu Zhang1Hongbo Zhou2School of Civil Engineering, Shaoxing University, Shaoxing 312000, ChinaSchool of Civil Engineering, Guizhou University of Engineering Science, Bijie 551700, ChinaNonferrous Geological Exploration and Research Institute Limited Liability Company, Shenyang 110013, ChinaIn this study, considering the scale effect of rock mass, the influence of different height-to-diameter ratios on rock mechanics and acoustic emission characteristics was studied by using PFC2D software. The damage constitutive model of rock was established, and the damage evolution characteristics of rock with different height-to-diameter ratios were further analyzed. The results showed that, with the increase of height-to-diameter ratio K, the uniaxial compressive strength and peak strain of rock exhibited a gradual decrease; however, the elastic modulus gradually increased. Moreover, rock failure modes exhibited different characteristics under different K values. The scale effect showed little influence on the acoustic emission characteristics in the elastic stage; nonetheless, in the plastic deformation stage and the residual damage stage, with the increase of the rock’s height-to-diameter ratio, the maximum number of impacts of acoustic emission increased, the range of strong strain of acoustic emission decreased, and the maximum time of acoustic emission impacts increased gradually. The height-to-diameter ratio of the rock slightly influenced the zero-damage stage of the rock, but the damage affecting the rock increased slowly and accelerated the development stage. The damage evolution law was found to be similar when the K values varied from 1.0 to 2.0; however, when the K was greater than 2.0, the damage evolution law exhibited the characteristics of slowing down in the acceleration phase.http://dx.doi.org/10.1155/2020/6660595 |
| spellingShingle | Haijiang Zhang Xiaohu Zhang Hongbo Zhou Research on Acoustic Emission Characteristics and Constitutive Model of Rock Damage Evolution with Different Sizes Advances in Civil Engineering |
| title | Research on Acoustic Emission Characteristics and Constitutive Model of Rock Damage Evolution with Different Sizes |
| title_full | Research on Acoustic Emission Characteristics and Constitutive Model of Rock Damage Evolution with Different Sizes |
| title_fullStr | Research on Acoustic Emission Characteristics and Constitutive Model of Rock Damage Evolution with Different Sizes |
| title_full_unstemmed | Research on Acoustic Emission Characteristics and Constitutive Model of Rock Damage Evolution with Different Sizes |
| title_short | Research on Acoustic Emission Characteristics and Constitutive Model of Rock Damage Evolution with Different Sizes |
| title_sort | research on acoustic emission characteristics and constitutive model of rock damage evolution with different sizes |
| url | http://dx.doi.org/10.1155/2020/6660595 |
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