红砂岩卸载破坏强度特征试验研究

doi:10.13722/j.cnki.jrme.2017.1368

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Abstract Excavation is routine operation in underground rock engineering. The unloading behavior of high stress rock differs from the rock under the loading conditions and results in engineering disasters such as large deformation or rockburst. In order to reveal the unloading effect，triaxial tests are conducted and the strengths of cubic red sandstone samples under loading/unloading conditions are measured. According to the tests，the samples firstly split in the adjacent area of unloading surface several seconds after the unloading，and then lose the bearing capacity as a whole. The test results indicate that under the rapid unloading condition，the unloading strength is 8.4% to 27.2% lower than the loading strength. The higher the confining stress is，the bigger the strength declines. When the confining stress is the same，the strength under double-direction unloading condition is lower than that of under one-direction unloading condition. A dynamic damping vibration model is established and the influence factors of unloading failure are discussed. The negative unloading effect of the rock strength revealed by the tests is of great importance for evaluating the rock parameters under unloading conditions reasonably.

Key words： rock mechanics red sandstone unloading effect strength characteristic true-axial test

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	Articles by authors
	FAN Pengxian1
	2
	LI Ying1
	ZHAO Yuetang1
	WANG Mingyang1
	WANG Derong1
	SHI Yehui2

Cite this article:

FAN Pengxian1,2,LI Ying1, et al. Experimental study on unloading failure strength of red sandstone[J]. , 2018, 37(4): 852-861.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2017.1368 OR http://www.rockmech.org/EN/Y2018/V37/I4/852

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