饱和过程中黏土岩变形和水化膨胀特性研究

doi:10.13722/j.cnki.jrme.2022.0633

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Abstract In the in-situ state，the clay rock is saturated，but in the actual laboratory study，the clay rock has lost water and is unsaturated due to the influence of drilling core，transportation，storage，and processing. Therefore，restoring the clay rock to the in-situ saturation state as far as possible before the further experimental test is an important prerequisite for further experimental tests. This paper takes clay rock as the research object，through the clay rock saturation test without external force and the saturation test under in-situ stress，the focus is on the hydration expansion properties of clay rock and the deformation law in the process of saturation from a macro and mesoscopic perspective. The research shows that with different water saturation time，under the action of no external force，the claystone with central circular pores gradually fills the original pores due to the expansion，disintegration and mixed accumulation of clay minerals. Under the in-situ stress，the action of brine still causes the rapid hydration and expansion of the clay minerals in the clay rock，and the macroscopic appearance of the sample volume increases rapidly while the porosity increases significantly. The expansion deformation is negatively correlated with the initial saturation of the sample. Further，based on the Comsol Multiphysics multi-field coupled finite element，the fluid flow module in the software establishes the geometric model of the clay rock sample and carries out the numerical simulation of the saturation process of the clay rock. Finally，pore pressure coefficient B during saturation and the effect of loading steps on the clay rock saturation process are discussed. The research results will provide experimental guidance and theoretical basis for the related research on the physio-mechanical properties of clay rocks and other rocks.

Key words： rock mechanics clay rock saturation deformation law hydration swelling

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	Articles by authors
	YU Hongdan1
	CHEN Weizhong1
	TAN Xianjun1
	LEI Jiang2
	ZHAO Wusheng1

Cite this article:

YU Hongdan1,CHEN Weizhong1,TAN Xianjun1, et al. Deformation and hydration swelling characteristics of clay rock during saturation[J]. , 2022, 41(S2): 3534-3542.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0633 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/IS2/3534

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