Study on Evolution of the Thermophysical and Mechanical Properties of Inner Shaft Lining Concrete during Construction Period
The asymmetric temperature field is one of the main factors inducing the cracking of the inner shaft lining during freezing-shaft sinking. The evolution equation for the thermophysical and mechanical properties of shaft lining concrete during construction period is the basis for revealing the cracki...
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| Format: | Article |
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MDPI AG
2022-10-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/12/19/10141 |
| _version_ | 1797480431927427072 |
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| author | Chi Zhang Yu Zhang Weihao Yang Jiying Yin Tao Zhang |
| author_facet | Chi Zhang Yu Zhang Weihao Yang Jiying Yin Tao Zhang |
| author_sort | Chi Zhang |
| collection | DOAJ |
| description | The asymmetric temperature field is one of the main factors inducing the cracking of the inner shaft lining during freezing-shaft sinking. The evolution equation for the thermophysical and mechanical properties of shaft lining concrete during construction period is the basis for revealing the cracking mechanism. In this study, several experiments were conducted to reveal the evolution of the temperature field, thermal conductivity, specific heat capacity, compressive strength, tensile strength, and elastic modulus of shaft lining concrete with age and lining thickness within the first 7 d after pouring. Results show that the shaft lining concrete temperature curve after pouring can be divided into five stages: induction, slow heating, rapid heating, rapid cooling, and slow cooling. Thermal conductivity and specific heat capacity reached the maximum on Day 1 and gradually decreased with an increase in age. The compressive strength, tensile strength and elastic modulus significantly increased with age. With an increase in thickness, the shaft lining concrete at the same age improved its three mechanical parameters. Finally, the evolution equation for these thermophysical and mechanical parameters with age within the first 7 d after pouring was fitted based on experimental data. This study is expected to provide a thermophysical and mechanical basis for studying the cracking mechanism of the inner shaft lining. |
| first_indexed | 2024-03-09T21:59:55Z |
| format | Article |
| id | doaj.art-c771c86bd1bb4125898c299557582408 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-09T21:59:55Z |
| publishDate | 2022-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-c771c86bd1bb4125898c2995575824082023-11-23T19:51:44ZengMDPI AGApplied Sciences2076-34172022-10-0112191014110.3390/app121910141Study on Evolution of the Thermophysical and Mechanical Properties of Inner Shaft Lining Concrete during Construction PeriodChi Zhang0Yu Zhang1Weihao Yang2Jiying Yin3Tao Zhang4State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, ChinaState Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, ChinaState Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, ChinaChina Design Group, Nanjing 210014, ChinaSchool of Transportation and Civil Engineering, Nantong University, Nantong 226019, ChinaThe asymmetric temperature field is one of the main factors inducing the cracking of the inner shaft lining during freezing-shaft sinking. The evolution equation for the thermophysical and mechanical properties of shaft lining concrete during construction period is the basis for revealing the cracking mechanism. In this study, several experiments were conducted to reveal the evolution of the temperature field, thermal conductivity, specific heat capacity, compressive strength, tensile strength, and elastic modulus of shaft lining concrete with age and lining thickness within the first 7 d after pouring. Results show that the shaft lining concrete temperature curve after pouring can be divided into five stages: induction, slow heating, rapid heating, rapid cooling, and slow cooling. Thermal conductivity and specific heat capacity reached the maximum on Day 1 and gradually decreased with an increase in age. The compressive strength, tensile strength and elastic modulus significantly increased with age. With an increase in thickness, the shaft lining concrete at the same age improved its three mechanical parameters. Finally, the evolution equation for these thermophysical and mechanical parameters with age within the first 7 d after pouring was fitted based on experimental data. This study is expected to provide a thermophysical and mechanical basis for studying the cracking mechanism of the inner shaft lining.https://www.mdpi.com/2076-3417/12/19/10141freezing shaft sinkingshaft liningthermophysical propertiesmechanical propertiesevolution law |
| spellingShingle | Chi Zhang Yu Zhang Weihao Yang Jiying Yin Tao Zhang Study on Evolution of the Thermophysical and Mechanical Properties of Inner Shaft Lining Concrete during Construction Period Applied Sciences freezing shaft sinking shaft lining thermophysical properties mechanical properties evolution law |
| title | Study on Evolution of the Thermophysical and Mechanical Properties of Inner Shaft Lining Concrete during Construction Period |
| title_full | Study on Evolution of the Thermophysical and Mechanical Properties of Inner Shaft Lining Concrete during Construction Period |
| title_fullStr | Study on Evolution of the Thermophysical and Mechanical Properties of Inner Shaft Lining Concrete during Construction Period |
| title_full_unstemmed | Study on Evolution of the Thermophysical and Mechanical Properties of Inner Shaft Lining Concrete during Construction Period |
| title_short | Study on Evolution of the Thermophysical and Mechanical Properties of Inner Shaft Lining Concrete during Construction Period |
| title_sort | study on evolution of the thermophysical and mechanical properties of inner shaft lining concrete during construction period |
| topic | freezing shaft sinking shaft lining thermophysical properties mechanical properties evolution law |
| url | https://www.mdpi.com/2076-3417/12/19/10141 |
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