Study on the Porosity of Saturated Fragmentized Coals during Creep Process and Constitutive Relation
Pore abundance and deformation characteristics of saturated fragmentized coals during creep process are of significant meaning to the study on ground sediment in the mined-out area. The law of porosity variation of saturated fragmentized coals during creep process and its creep constitutive model we...
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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/10.1155/2020/8851061 |
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| author | Peng Gong Zhanguo Ma Yongheng Chen Shixing Cheng Kelong Li |
| author_facet | Peng Gong Zhanguo Ma Yongheng Chen Shixing Cheng Kelong Li |
| author_sort | Peng Gong |
| collection | DOAJ |
| description | Pore abundance and deformation characteristics of saturated fragmentized coals during creep process are of significant meaning to the study on ground sediment in the mined-out area. The law of porosity variation of saturated fragmentized coals during creep process and its creep constitutive model were studied by using the self-developed multiphase coupling creep test device. And, results have indicated that the porosity logarithm of fragmentized coal during creep process shows a linear negative correlation with the time ln(n−a) = −ct + lnb, and the porosity decrease is evidently divided into three phases. In addition, when the stress level is relatively low, the porosity decreases slowly; when the stress level rises up, the porosity decreases quickly; when the stress level remains stable finally, the porosity is smaller. Under the equal stress, as the grain size of fragmentized coals decreases, the porosity tends to decrease, and as the grain size of fragmentized coal tends to be stable, the porosity tends to increase; the creep constitutive equation of fragmentized coals with different grain sizes was established by using the Kelvin–Voigt model, and the correlation analysis shows that the Kelvin–Voigt creep model of fragmentized coals is reasonable. |
| format | Article |
| id | doaj-art-3c2733fc735b4eedb8d67dd1229da17f |
| institution | OA Journals |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-3c2733fc735b4eedb8d67dd1229da17f2025-08-20T02:08:16ZengWileyAdvances in Civil Engineering1687-80861687-80942020-01-01202010.1155/2020/88510618851061Study on the Porosity of Saturated Fragmentized Coals during Creep Process and Constitutive RelationPeng Gong0Zhanguo Ma1Yongheng Chen2Shixing Cheng3Kelong Li4State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, ChinaState Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, ChinaSchool of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, ChinaState Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, ChinaSchool of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, ChinaPore abundance and deformation characteristics of saturated fragmentized coals during creep process are of significant meaning to the study on ground sediment in the mined-out area. The law of porosity variation of saturated fragmentized coals during creep process and its creep constitutive model were studied by using the self-developed multiphase coupling creep test device. And, results have indicated that the porosity logarithm of fragmentized coal during creep process shows a linear negative correlation with the time ln(n−a) = −ct + lnb, and the porosity decrease is evidently divided into three phases. In addition, when the stress level is relatively low, the porosity decreases slowly; when the stress level rises up, the porosity decreases quickly; when the stress level remains stable finally, the porosity is smaller. Under the equal stress, as the grain size of fragmentized coals decreases, the porosity tends to decrease, and as the grain size of fragmentized coal tends to be stable, the porosity tends to increase; the creep constitutive equation of fragmentized coals with different grain sizes was established by using the Kelvin–Voigt model, and the correlation analysis shows that the Kelvin–Voigt creep model of fragmentized coals is reasonable.http://dx.doi.org/10.1155/2020/8851061 |
| spellingShingle | Peng Gong Zhanguo Ma Yongheng Chen Shixing Cheng Kelong Li Study on the Porosity of Saturated Fragmentized Coals during Creep Process and Constitutive Relation Advances in Civil Engineering |
| title | Study on the Porosity of Saturated Fragmentized Coals during Creep Process and Constitutive Relation |
| title_full | Study on the Porosity of Saturated Fragmentized Coals during Creep Process and Constitutive Relation |
| title_fullStr | Study on the Porosity of Saturated Fragmentized Coals during Creep Process and Constitutive Relation |
| title_full_unstemmed | Study on the Porosity of Saturated Fragmentized Coals during Creep Process and Constitutive Relation |
| title_short | Study on the Porosity of Saturated Fragmentized Coals during Creep Process and Constitutive Relation |
| title_sort | study on the porosity of saturated fragmentized coals during creep process and constitutive relation |
| url | http://dx.doi.org/10.1155/2020/8851061 |
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