冻结饱和砂岩三轴压缩力学特性及强度预测模型研究

doi:10.13722/j.cnki.jrme.2018.1417

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Abstract The artificial freezing method has been widely used in excavation of water-rich soft rock layers，and hence，understanding the mechanical properties of frozen rock is of great engineering significance. Taking saturated cretaceous sandstone as testing sample，triaxial compression tests with different confining pressures(0，2，4 and 6 MPa) were carried out at different temperatures(+20 ℃，0 ℃，－10 ℃ and －20 ℃). The results demonstrate a strong negative correlation between the strength of saturated sandstone and the subzero temperature. Under the same confining pressure, the peak pressure increases by 2–4 times when the temperature reduces from +20 ℃ to －20 ℃. At a constant freezing temperature，the peak strength increases by 1–3 times when the confining pressure increases from 0 MPa to 6 MPa. Both the cohesive force and the internal friction angle rise with decreasing the temperature，up to 5 times for the former. A strength forecasting model for frozen sandstone is proposed based on the comparison of prediction accuracy of five existing strength criterion theories according to the test results. The Rocker criterion is proven to be optimal and further modified taking into account the effect of the temperature on its parameters. The above results could provide a guidance for rock excavation both in cold regions and artificial frozen layers.

Key words： rock mechanics frozen sandstone triaxial compression deformation and failure strength forecasting

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	Articles by authors
	YANG Gengshe
	WEI Yao
	SHEN Yanjun
	WANG Lei
	LIU Hui
	DONG Xihao
	LI Xiaojin

Cite this article:

YANG Gengshe,WEI Yao,SHEN Yanjun, et al. Mechanical behavior and strength forecast model of frozen saturated sandstone under triaxial compression[J]. , 2019, 38(4): 683-694.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.1417 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/I4/683

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