Mechanical Properties and Acoustic Emission Characteristics of Thawing Frozen Sandstone
After the construction of a frozen shaft wall is completed, it undergoes a long thawing process. Damage accumulation under load may result in the rupture of the frozen wall and cause engineering accidents. The change in the mechanical properties of the frozen rock during the thawing process is cruci...
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| Format: | Article |
| Language: | English |
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Wiley
2022-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2022/2156710 |
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| author | Gengshe Yang Bo Liang Hui Liu Yanjun Shen Hailiang Jia |
| author_facet | Gengshe Yang Bo Liang Hui Liu Yanjun Shen Hailiang Jia |
| author_sort | Gengshe Yang |
| collection | DOAJ |
| description | After the construction of a frozen shaft wall is completed, it undergoes a long thawing process. Damage accumulation under load may result in the rupture of the frozen wall and cause engineering accidents. The change in the mechanical properties of the frozen rock during the thawing process is crucial to the stability of the frozen wall. In this study, we selected Cretaceous saturated sandstone as the research object and performed uniaxial compression tests on the frozen sandstone to analyze its mechanical properties during the thawing process. In addition, acoustic emission technology was used to analyze the damage and failure characteristics of the rock. The main findings of the study are as follows: (1) the results of the uniaxial compression tests revealed that the thawing of frozen sandstone comprises five stages. The closure stress, crack initiation stress, expansion strength, and peak strength were obtained from the volumetric stress-strain curve. These four stress values act as the dividing points of the five stages. (2) The initiation stress of frozen sandstone at different temperatures accounts for approximately 50% of the peak strength. The strength value is low, the deformation is large, and it exhibits an obvious strain-softening phenomenon. (3) As the temperature increases, the closure level of the saturated sandstone gradually increases, and the crack initiation and expansion levels gradually decrease. (4) Based on the four characteristic stresses of the thawing process of frozen sandstone, the acoustic emission signal can be divided into a quiet period, an increasing period, a frequent period, a sharp increase period, and a decline period. (5) A frozen sandstone damage model was established based on the D-P failure criterion. The efficacy of the model was evaluated against the test data and was found to be reasonably accurate. This paper uses acoustic emission technology to simultaneously monitor the melting process of frozen rocks and reveal the relationship between intensity and temperature. The results provide theoretical and technical support for evaluating the mechanical damage induced by thawing of a frozen shaft wall. |
| format | Article |
| id | doaj-art-0beba74c618b4aec99e1ec218c941f17 |
| institution | Kabale University |
| issn | 1687-8442 |
| language | English |
| publishDate | 2022-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-0beba74c618b4aec99e1ec218c941f172025-02-03T01:07:16ZengWileyAdvances in Materials Science and Engineering1687-84422022-01-01202210.1155/2022/2156710Mechanical Properties and Acoustic Emission Characteristics of Thawing Frozen SandstoneGengshe Yang0Bo Liang1Hui Liu2Yanjun Shen3Hailiang Jia4School of Architecture and Civil EngineeringSchool of Architecture and Civil EngineeringSchool of Architecture and Civil EngineeringCollege of Geology and EnvironmentSchool of Architecture and Civil EngineeringAfter the construction of a frozen shaft wall is completed, it undergoes a long thawing process. Damage accumulation under load may result in the rupture of the frozen wall and cause engineering accidents. The change in the mechanical properties of the frozen rock during the thawing process is crucial to the stability of the frozen wall. In this study, we selected Cretaceous saturated sandstone as the research object and performed uniaxial compression tests on the frozen sandstone to analyze its mechanical properties during the thawing process. In addition, acoustic emission technology was used to analyze the damage and failure characteristics of the rock. The main findings of the study are as follows: (1) the results of the uniaxial compression tests revealed that the thawing of frozen sandstone comprises five stages. The closure stress, crack initiation stress, expansion strength, and peak strength were obtained from the volumetric stress-strain curve. These four stress values act as the dividing points of the five stages. (2) The initiation stress of frozen sandstone at different temperatures accounts for approximately 50% of the peak strength. The strength value is low, the deformation is large, and it exhibits an obvious strain-softening phenomenon. (3) As the temperature increases, the closure level of the saturated sandstone gradually increases, and the crack initiation and expansion levels gradually decrease. (4) Based on the four characteristic stresses of the thawing process of frozen sandstone, the acoustic emission signal can be divided into a quiet period, an increasing period, a frequent period, a sharp increase period, and a decline period. (5) A frozen sandstone damage model was established based on the D-P failure criterion. The efficacy of the model was evaluated against the test data and was found to be reasonably accurate. This paper uses acoustic emission technology to simultaneously monitor the melting process of frozen rocks and reveal the relationship between intensity and temperature. The results provide theoretical and technical support for evaluating the mechanical damage induced by thawing of a frozen shaft wall.http://dx.doi.org/10.1155/2022/2156710 |
| spellingShingle | Gengshe Yang Bo Liang Hui Liu Yanjun Shen Hailiang Jia Mechanical Properties and Acoustic Emission Characteristics of Thawing Frozen Sandstone Advances in Materials Science and Engineering |
| title | Mechanical Properties and Acoustic Emission Characteristics of Thawing Frozen Sandstone |
| title_full | Mechanical Properties and Acoustic Emission Characteristics of Thawing Frozen Sandstone |
| title_fullStr | Mechanical Properties and Acoustic Emission Characteristics of Thawing Frozen Sandstone |
| title_full_unstemmed | Mechanical Properties and Acoustic Emission Characteristics of Thawing Frozen Sandstone |
| title_short | Mechanical Properties and Acoustic Emission Characteristics of Thawing Frozen Sandstone |
| title_sort | mechanical properties and acoustic emission characteristics of thawing frozen sandstone |
| url | http://dx.doi.org/10.1155/2022/2156710 |
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