Abstract
The portal section of a high-speed railway tunnel in southern China has been in a high-temperature state for a long time and is affected by significant temperature differences. Due to the heterogeneity of surrounding rock, temperature stress will be generated between mineral particles. When it is greater than the tensile strength, the rock will crack. To analyze the mechanism of rock cracking: (1) Based on thermoelastic mechanics and Weibull distribution, considering the non-uniformity of the coefficient of thermal expansion (CTE) of mineral cell elements, a mechanical model of high-temperature cracking is established. (2) The inhomogeneous mineral cell’s thermal conductivity (TC) was determined based on the Agari model. (3) The crack initiation law of rock under local temperature gradient under different CTE and TC homogeneity coefficients is studied from the macroscopic and microscopic perspectives. (4) The variation of granite temperature stress with homogeneity coefficient is analyzed by engineering examples, and the theoretical model is verified. The results show that with the increase of temperature, the internal stress of rock increases, and the peak strength of rock increases with the increase of homogeneity coefficient. The local temperature gradient in the rock leads to the concentration of the initial crack propagation area. The model preliminarily shows the mechanism of rock crack development and expansion under the joint action of local temperature gradient and mineral heterogeneity, thus revealing the mode of thermal rock fracture and providing a new theoretical basis for the prevention and control of surrounding rock diseases in high-speed railway tunnels.
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Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
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Supported by the Fundamental Research Funds for the Central Universities (2021YJS123); The National Natural Science Foundation of China (No. 51978039).
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Li, W., Chen, W. High Temperature Cracking Mechanism of Surrounding Rock Due to TC and CTE Heterogeneity. Geotech Geol Eng 41, 2359–2375 (2023). https://doi.org/10.1007/s10706-023-02402-y
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DOI: https://doi.org/10.1007/s10706-023-02402-y