冻融循环作用下中部锁固岩桥破坏试验研究

doi:10.13722/j.cnki.jrme.2019.0982

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Abstract In order to explore the deformation and failure mechanisms of central locked slopes，the frost heave force monitoring tests and uniaxial compression tests under different freeze-thaw cycles were carried out on rock samples with three different rock bridge angles. The test results reveal that the evolution process of the frost heave force in rock samples during the freeze-thaw cycle includes six stages including early derivation，steep rise，falling，stationary，melting and dissipation. The effects of the bridge angle and the freeze-thaw cycle number on strength and deformation characteristics，damage characteristics and failure modes of rock samples were discussed. It is shown that，with increasing the number of freeze-thaw cycles，the peak stress loss rate and the peak strain of rock samples respectively increase as a power function and a quadratic polynomial，while the relative elastic modulus decreases exponentially. With increasing the number of freeze-thaw cycles，the damage variable increases as a power function. The damage variable of rock samples with a crack at an angle of 15° to the vertical direction is the largest，while the damage variable with a 30° crack is the smallest. The larger the rock bridge angle or the greater the number of freeze-thaw cycles is，the more easily the bridge in the middle of the sample connects. The test results are of great significance to reveal the freeze-thaw damage mechanisms of the central locked slope and have reference value for the construction of rock engineering in cold regions.

Key words： rock mechanics freeze-thaw cycle rock bridge locked slope frost heave force mechanical properties

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	Articles by authors
	QIAO Chen1
	2
	LI Changhong1
	2
	WANG Yu1
	2
	YAN Bingqian1
	2

Cite this article:

QIAO Chen1,2,LI Changhong1, et al. Experimental study on failure of central rock bridge under freeze-thaw cycle#br#[J]. , 2020, 39(6): 1094-1103.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.0982 OR https://rockmech.whrsm.ac.cn/EN/Y2020/V39/I6/1094

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