热损伤大理岩三轴力学特性及强度模型

doi:10.13722/j.cnki.jrme.2017.1656

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Abstract High temperature treatment can induce thermal damage to rock. Conventional triaxial compression tests on coarse-grained marble specimens after exposure to different high temperatures are conducted. The influence of thermal damage on porosity，P-wave velocity，and thermal micro-cracking behavior is investigated and the combined effects of thermal damage and confinement on the strength and deformation behavior are studied. A GSI-softening model，which is based on the widely used Hoek-Brown model，is also proposed to capture the strength behavior of thermally-damage rock. The main findings of this study are as follows：As the treatment temperature gradually increases，more thermally-induced micro-cracks can be observed in the specimen. The porosity increases and the P-wave velocity decreases with the increase in the treatment temperature. The ductility of the rock is enhanced as the treatment temperature increases. High temperature treatment can greatly reduce the rock strength. However，as the treatment temperature gradually increases，the strengths of rock specimen under different temperature treatments approach the same，indicating that the confinement is the main factor that controls the rock strength when the confining pressure is high. Based on test data in this study and three sets of test data from previous publications，it is found that the variation of rock strength with confining pressure for thermal damaged rock can be well captured using the proposed GSI-softening model. The variation of GSI in the model can represent the thermal damage in the rock to some extent.

Key words： rock mechanics marble triaxial compression test thermal damage confinement strength model

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	HOU Di1
	PENG Jun2

Cite this article:

HOU Di1,PENG Jun2. Triaxial mechanical behavior and strength model for thermally-damaged marble [J]. , 2019, 38(S1): 2603-2613.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.1656 OR http://rockmech.whrsm.ac.cn/EN/Y2019/V38/IS1/2603

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