川中红层泥岩时效膨胀变形特性试验研究

doi:10.13722/j.cnki.jrme.2018.0861

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Abstract The Jurassic red-bed mudstone，widely distributed in Sichuan basin and the peripheral mountains and named as Sichuan Central Red-bed，is a typical kind of soft rock with low strength，easily weathering and disintegrating，notable rheology and slightly swelling，and taken as one of the most important factors resulted in the upheaval deformation of some high speed railway subgrade sections. In order to reveal the time-dependent swelling characteristics of red-bed mudstone under soaking condition，the expansion tests were carried out on typical Central Sichuan red-bed mudstone samples，and the hydrophil expansion deformation of red-bed mudstone with time and the influence factors were analysed. The results show that as indicated by the conventional swelling index，the selected red-bed mudstone is non-swelling or weakly swelling, and that the water-absorption expansion rate is low but time-dependent significantly. A swelling creep model of red-bed mudstone was proposed based on the Kelvin system，in which the creep parameters，K and ?，can effectively quantify the ultimate swelling strain and viscous properties during creeping，respectively. The structure of undisturbed rock samples is an important factor influencing the water-absorption. The grain size of the maximum content group，dmax，the weight ratio of fine and micro particles，?1.0，and the effective particle size，d10，obtained through the sieve tests，can quantitatively evaluate the water-absorption and swelling characteristics of red-bed mudstone. The smaller dmax and d10，the larger ?1.0 is and as a result，the water-absorption and swelling are stronger. The research work can provide a reference for revealing the long-term upheaval mechanism and demonstrating the treatment scheme of high speed railway subgrade Sichuan Central red-bed mudstone，and also laid a basis for the further quantitative research of red-bed mudstone on the physical，hydraulic and mechanical properties and their relationships.

Key words： rock mechanics red-bed mudstone swelling creep model water-absorption rate structure of undisturbed rock samples

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	Articles by authors
	ZHONG Zhibin1
	2
	LI Anhong 1
	DENG Ronggui2
	WU Peipei1
	XU Jun1

Cite this article:

ZHONG Zhibin1,2,LI Anhong 1, et al. Experimental study on the time-dependent swelling characteristics of red-bed mudstone in Central Sichuan[J]. , 2019, 38(1): 76-86.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2018.0861 OR http://www.rockmech.org/EN/Y2019/V38/I1/76

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