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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摘要考虑泥岩、砂质泥岩等膨胀性岩石具有吸湿诱发膨胀的特性，将膨胀性岩石的膨胀变形过程分为吸湿和膨胀2个阶段，建立膨胀性岩石吸湿–膨胀分析模型，推导岩体湿度扩散控制方程，提出考虑吸湿诱发膨胀效应的湿度场计算方法。依据该分析理论并结合室内试验，获得膨胀过程中岩体内部湿度时空扩散规律以及湿度扩散系数和吸湿膨胀系数的影响特征。研究结果表明，岩体内部湿度扩散具有显著时空规律，湿度随时间的发展趋势呈现先缓慢后迅速再到平缓的过程，相同时间点下湿度随到增湿面距离的增加呈负指数趋势衰减；吸湿膨胀系数一定时，极限膨胀变形量与湿度扩散系数符合幂指数函数关系，且D/ 在(0，1)区间时，极限膨胀变形量增长愈加明显；极限膨胀变形量一定时，吸湿膨胀系数与湿度扩散系数呈负指数关系，且当D/ ＞2时，湿度扩散系数对吸湿膨胀系数几乎没有影响。

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	丁秀丽
	赵化蒙
	黄书岭

关键词 ：岩石力学, 膨胀性岩石, 湿度扩散, 吸湿&ndash, 膨胀分析模型, 膨胀变形, 演化规律

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

引用本文:

丁秀丽，赵化蒙，黄书岭. 基于吸湿–膨胀分析模型的岩石膨胀变形演化规律研究[J]. 岩石力学与工程学报, 2021, 40(S2): 3005-3013.
DING Xiuli，ZHAO Huameng，HUANG Shuling. Study on swelling characteristics of mudstones considering adsorption-expansion analysis model. , 2021, 40(S2): 3005-3013.

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

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