川中红层泥岩吸水膨胀时效特征的试验研究

doi:10.13722/j.cnki.jrme.2020.0453

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Abstract The red mudstone with the characteristics of low strength, easy weathering, and easy expansion of water absorption，which is widely distributed in the Sichuan Basin and resulting a high threat to the high-speed rail operations due to strict control of rail deformation in Sichuan. In reference to the continuous implementation project of subgrade deformation for certain transportation line，the swelling characteristics of the weakly weathered mudstone were correlated with the influence of the mudstone by the pressure head，which were described in this essay. It has been found that the swelling characteristic of weakly weathered mudstone shows a significant time lapse and there is no observation of converging about one month for in-situ swelling test. However，there is still a great potential of swelling which indicates a long and slow process of the swelling of weakly weathered mudstone in the natural environment. The indoor test infers that the absorption capacity of the red mudstone increases with a growing water pressure and the time lapse curve shows three stages: rapid growth，decelerating growth, and gradual stabilization. The specimen reaches 90% of its capacity within 14.4 to 49.1 hours and achieves 98% in 145.2 hours. Based on the research results, the differences in the expansion deformation characteristics of indoor and outdoor mudstones and their internal mechanisms were compared and analyzed，which inspires the exploration of continuous deformation of mudstone subgrade.

Key words： rock mechanics red-bed mudstone in-situ test water absorption swelling pressure water subgrade uplift water absorption condition

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	FENG Gaoshun1
	2
	YU Fei1
	DAI Zhangjun1
	CHEN Shanxiong1
	LI Jian1

Cite this article:

FENG Gaoshun1,2,YU Fei1, et al. Experimental study on time effect characteristics of red mudstone swelling in Central Sichuan[J]. , 2022, 41(S1): 2780-2790.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0453 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/IS1/2780

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