基于吸湿–膨胀分析模型的岩石膨胀变形演化规律研究

doi:10.13722/j.cnki.jrme.2021.0603

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Abstract Considering that swelling rocks such as mudstone and sandy mudstone have the characteristics of absorbing moisture to induce swelling，this paper divided the swelling deformation process of swelling rock into two stages，namely moisture absorption and expansion，and established a moisture absorption-swelling analysis model for swelling rock，deduced the control equation of the rock mass moisture diffusion，and proposed a humidity field calculation method considering the expansion effect induced by moisture absorption. According to the analysis theory and combined with the indoor experiment，the temporal and spatial diffusion law of humidity inside the rock mass and the influence characteristics of the humidity diffusion coefficient and the adsorption expansion coefficient were obtained during the expansion process. The results show that the internal humidity diffusion of rock mass has a significant temporal and spatial law，and the development trend of humidity with time is first slow，then rapid and then gentle. At the same time point，the humidity decreases with a negative exponential trend with the increase of the distance to the humidifying surface. When the adsorption expansion coefficient is constant，the relationship between the ultimate expansion deformation and the humidity diffusion coefficient conforms to the power exponential function，and when D/ is in the(0，1)，the ultimate expansion deformation increases more obviously. When the limit expansion deformation is constant，the relationship between adsorption expansion coefficient and humidity diffusion coefficient is negative exponential，and when D/ ＞2，the humidity diffusion coefficient has little effect on the adsorption expansion coefficient.

Key words： rock mechanics expansive rocks humidity diffusion moisture absorption-expansion analysis model expansion deformation evolution law

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	Articles by authors
	DING Xiuli
	ZHAO Huameng
	HUANG Shuling

Cite this article:

DING Xiuli,ZHAO Huameng,HUANG Shuling. Study on swelling characteristics of mudstones considering adsorption-expansion analysis model[J]. , 2021, 40(S2): 3005-3013.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0603 OR http://rockmech.whrsm.ac.cn/EN/Y2021/V40/IS2/3005

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