Features and Constitutive Model of Gypsum’s Uniaxial Creep Damage considering Acidization
Acidic fluids cause rock erosion and further endanger the safety of rock engineering, especially the corrosion of pillars by acidic or weakly acidic groundwater. In this paper, the rock samples in the gypsum mining area were taken as the research object. Uniaxial compression creep tests were carried...
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2020/8874403 |
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| author | Wei Chen Wen Wan Senlin Xie Wenlong Kuang Wenqing Peng Qiuhong Wu Shasha Tong Xianqing Wang Xiaoyu Tang |
| author_facet | Wei Chen Wen Wan Senlin Xie Wenlong Kuang Wenqing Peng Qiuhong Wu Shasha Tong Xianqing Wang Xiaoyu Tang |
| author_sort | Wei Chen |
| collection | DOAJ |
| description | Acidic fluids cause rock erosion and further endanger the safety of rock engineering, especially the corrosion of pillars by acidic or weakly acidic groundwater. In this paper, the rock samples in the gypsum mining area were taken as the research object. Uniaxial compression creep tests were carried out under neutral water, pH=6 and pH=5 hydrochloric acid solutions, respectively. Meanwhile, the specimens before and after saturation were observed by an electron microscope scanner. The results show that (1) the gypsum specimens with pH=5 hydrochloric acid were damaged at the first stress level, while that with pH=6 and pH=7 were destroyed at the second stress level. The failure modes of the three groups were basically the same, with cleavage and end damage of different degrees. The difference is that the failure time of the former is earlier than that of the latter, which indicates that the stronger acidity causes greater corrosion on the creep of the samples. (2) From the perspective of microstructure, the samples saturated in the neutral aqueous solution and dry state are compact and complete in structure, and the whole is relatively homogeneous. However, after saturating in the acid solution, the samples significantly increased dense pores with large size and loose structure. Due to the rapid increase, the surfaces of the samples are almost like “holes”. (3) A new nonlinear creep constitutive model was established by connecting Burgers model with nonlinear viscoplastic body (NVPB) model in series, which can well describe the creep characteristics of gypsum rocks under acid corrosion. |
| format | Article |
| id | doaj-art-bc80ad3aae624067be9488df3a4e2d02 |
| institution | Kabale University |
| issn | 1468-8115 1468-8123 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
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| series | Geofluids |
| spelling | doaj-art-bc80ad3aae624067be9488df3a4e2d022025-02-03T01:05:13ZengWileyGeofluids1468-81151468-81232020-01-01202010.1155/2020/88744038874403Features and Constitutive Model of Gypsum’s Uniaxial Creep Damage considering AcidizationWei Chen0Wen Wan1Senlin Xie2Wenlong Kuang3Wenqing Peng4Qiuhong Wu5Shasha Tong6Xianqing Wang7Xiaoyu Tang8School of Resource, Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, Hunan 411201, ChinaSchool of Resource, Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, Hunan 411201, ChinaSchool of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, ChinaSchool of Resource, Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, Hunan 411201, ChinaSchool of Resource, Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, Hunan 411201, ChinaWork Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines, Hunan University of Science and Technology, Xiangtan, Hunan 411201, ChinaForeign Language School, Hunan University of Science and Technology, Xiangtan, Hunan 411201, ChinaSchool of Resource, Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, Hunan 411201, ChinaSchool of Resource, Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, Hunan 411201, ChinaAcidic fluids cause rock erosion and further endanger the safety of rock engineering, especially the corrosion of pillars by acidic or weakly acidic groundwater. In this paper, the rock samples in the gypsum mining area were taken as the research object. Uniaxial compression creep tests were carried out under neutral water, pH=6 and pH=5 hydrochloric acid solutions, respectively. Meanwhile, the specimens before and after saturation were observed by an electron microscope scanner. The results show that (1) the gypsum specimens with pH=5 hydrochloric acid were damaged at the first stress level, while that with pH=6 and pH=7 were destroyed at the second stress level. The failure modes of the three groups were basically the same, with cleavage and end damage of different degrees. The difference is that the failure time of the former is earlier than that of the latter, which indicates that the stronger acidity causes greater corrosion on the creep of the samples. (2) From the perspective of microstructure, the samples saturated in the neutral aqueous solution and dry state are compact and complete in structure, and the whole is relatively homogeneous. However, after saturating in the acid solution, the samples significantly increased dense pores with large size and loose structure. Due to the rapid increase, the surfaces of the samples are almost like “holes”. (3) A new nonlinear creep constitutive model was established by connecting Burgers model with nonlinear viscoplastic body (NVPB) model in series, which can well describe the creep characteristics of gypsum rocks under acid corrosion.http://dx.doi.org/10.1155/2020/8874403 |
| spellingShingle | Wei Chen Wen Wan Senlin Xie Wenlong Kuang Wenqing Peng Qiuhong Wu Shasha Tong Xianqing Wang Xiaoyu Tang Features and Constitutive Model of Gypsum’s Uniaxial Creep Damage considering Acidization Geofluids |
| title | Features and Constitutive Model of Gypsum’s Uniaxial Creep Damage considering Acidization |
| title_full | Features and Constitutive Model of Gypsum’s Uniaxial Creep Damage considering Acidization |
| title_fullStr | Features and Constitutive Model of Gypsum’s Uniaxial Creep Damage considering Acidization |
| title_full_unstemmed | Features and Constitutive Model of Gypsum’s Uniaxial Creep Damage considering Acidization |
| title_short | Features and Constitutive Model of Gypsum’s Uniaxial Creep Damage considering Acidization |
| title_sort | features and constitutive model of gypsum s uniaxial creep damage considering acidization |
| url | http://dx.doi.org/10.1155/2020/8874403 |
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