Dynamic Compressive Mechanical Property Characteristics and Fractal Dimension Applications of Coal-Bearing Mudstone at Real-Time Temperatures
Coal-bearing rocks are inevitably exposed to high temperatures and impacts (rapid dynamic load action) during deep-earth resource extraction, necessitating the study of their mechanical properties under such conditions. This paper reports on dynamic compression tests conducted on coal-bearing mudsto...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-09-01
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| Series: | Fractal and Fractional |
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| Online Access: | https://www.mdpi.com/2504-3110/7/9/695 |
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| author | Shiru Guo Lianying Zhang Hai Pu Yadong Zheng Bing Li Peng Wu Peitao Qiu Chao Ma Yiying Feng |
| author_facet | Shiru Guo Lianying Zhang Hai Pu Yadong Zheng Bing Li Peng Wu Peitao Qiu Chao Ma Yiying Feng |
| author_sort | Shiru Guo |
| collection | DOAJ |
| description | Coal-bearing rocks are inevitably exposed to high temperatures and impacts (rapid dynamic load action) during deep-earth resource extraction, necessitating the study of their mechanical properties under such conditions. This paper reports on dynamic compression tests conducted on coal-bearing mudstone specimens at real-time temperatures (the temperature of the rock remains constant throughout the impact process) ranging from 25 °C to 400 °C using a temperature Hopkinson (T-SHPB) test apparatus developed in-house. The objective is to analyze the relationship between mechanical properties and the fractal dimension of fractured fragments and to explore the mechanical response of coal-bearing mudstone specimens to the combined effects of temperature and impact using macroscopic fracture characteristics. The study found that the peak stress and dynamic elastic modulus initially increased and then decreased with increasing temperature, increasing in the 25–150 °C range and monotonically decreasing in the 150–400 °C range. Based on the distribution coefficients and fractal dimensions of the fractured fragments, it was found that the degree of damage of coal-bearing mudstone shows a trend of an initial decrease and then an increase with increasing temperature. In the temperature range of 25–150 °C, the expansion of clay minerals within the mudstone filled the voids between the skeletal particles, resulting in densification and decreased damage. In the temperature range of 150–400 °C, thermal stresses increased the internal fractures and reduced the overall strength of the mudstone, resulting in increased damage. Negative correlations between fractal dimensions, the modulus of elasticity, and peak stress could be used to predict rock properties in engineering. |
| first_indexed | 2024-03-10T22:43:57Z |
| format | Article |
| id | doaj.art-09f0eb08c6d04828b32f92bb7ff61200 |
| institution | Directory Open Access Journal |
| issn | 2504-3110 |
| language | English |
| last_indexed | 2024-03-10T22:43:57Z |
| publishDate | 2023-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Fractal and Fractional |
| spelling | doaj.art-09f0eb08c6d04828b32f92bb7ff612002023-11-19T10:48:54ZengMDPI AGFractal and Fractional2504-31102023-09-017969510.3390/fractalfract7090695Dynamic Compressive Mechanical Property Characteristics and Fractal Dimension Applications of Coal-Bearing Mudstone at Real-Time TemperaturesShiru Guo0Lianying Zhang1Hai Pu2Yadong Zheng3Bing Li4Peng Wu5Peitao Qiu6Chao Ma7Yiying Feng8State Key Laboratory of Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, ChinaSchool of Physics and New Energy, Xuzhou University of Technology, Xuzhou 221018, ChinaState Key Laboratory of Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, ChinaSchool of Physics and New Energy, Xuzhou University of Technology, Xuzhou 221018, ChinaSchool of Civil Engineering, Xuzhou University of Technology, Xuzhou 221018, ChinaSchool of Physics and New Energy, Xuzhou University of Technology, Xuzhou 221018, ChinaSchool of Civil Engineering, Xuzhou University of Technology, Xuzhou 221018, ChinaSchool of Physics and New Energy, Xuzhou University of Technology, Xuzhou 221018, ChinaSchool of Mathematics and Statistics, Suzhou University, Suzhou 234000, ChinaCoal-bearing rocks are inevitably exposed to high temperatures and impacts (rapid dynamic load action) during deep-earth resource extraction, necessitating the study of their mechanical properties under such conditions. This paper reports on dynamic compression tests conducted on coal-bearing mudstone specimens at real-time temperatures (the temperature of the rock remains constant throughout the impact process) ranging from 25 °C to 400 °C using a temperature Hopkinson (T-SHPB) test apparatus developed in-house. The objective is to analyze the relationship between mechanical properties and the fractal dimension of fractured fragments and to explore the mechanical response of coal-bearing mudstone specimens to the combined effects of temperature and impact using macroscopic fracture characteristics. The study found that the peak stress and dynamic elastic modulus initially increased and then decreased with increasing temperature, increasing in the 25–150 °C range and monotonically decreasing in the 150–400 °C range. Based on the distribution coefficients and fractal dimensions of the fractured fragments, it was found that the degree of damage of coal-bearing mudstone shows a trend of an initial decrease and then an increase with increasing temperature. In the temperature range of 25–150 °C, the expansion of clay minerals within the mudstone filled the voids between the skeletal particles, resulting in densification and decreased damage. In the temperature range of 150–400 °C, thermal stresses increased the internal fractures and reduced the overall strength of the mudstone, resulting in increased damage. Negative correlations between fractal dimensions, the modulus of elasticity, and peak stress could be used to predict rock properties in engineering.https://www.mdpi.com/2504-3110/7/9/695deep miningreal-time temperaturecoal-bearing mudstonedynamic mechanicsfractal dimensions |
| spellingShingle | Shiru Guo Lianying Zhang Hai Pu Yadong Zheng Bing Li Peng Wu Peitao Qiu Chao Ma Yiying Feng Dynamic Compressive Mechanical Property Characteristics and Fractal Dimension Applications of Coal-Bearing Mudstone at Real-Time Temperatures Fractal and Fractional deep mining real-time temperature coal-bearing mudstone dynamic mechanics fractal dimensions |
| title | Dynamic Compressive Mechanical Property Characteristics and Fractal Dimension Applications of Coal-Bearing Mudstone at Real-Time Temperatures |
| title_full | Dynamic Compressive Mechanical Property Characteristics and Fractal Dimension Applications of Coal-Bearing Mudstone at Real-Time Temperatures |
| title_fullStr | Dynamic Compressive Mechanical Property Characteristics and Fractal Dimension Applications of Coal-Bearing Mudstone at Real-Time Temperatures |
| title_full_unstemmed | Dynamic Compressive Mechanical Property Characteristics and Fractal Dimension Applications of Coal-Bearing Mudstone at Real-Time Temperatures |
| title_short | Dynamic Compressive Mechanical Property Characteristics and Fractal Dimension Applications of Coal-Bearing Mudstone at Real-Time Temperatures |
| title_sort | dynamic compressive mechanical property characteristics and fractal dimension applications of coal bearing mudstone at real time temperatures |
| topic | deep mining real-time temperature coal-bearing mudstone dynamic mechanics fractal dimensions |
| url | https://www.mdpi.com/2504-3110/7/9/695 |
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