Long Jiang1,2, Yuanfang Cheng This email address is being protected from spambots. You need JavaScript enabled to view it.1, Yiheng Zhang3, Chuanliang Yan1 and Zhongying Han1
1School of Petroleum Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, P.R. China 2Key Laboratory of Shale Gas Exploration, Ministry of Land and Resources, Chongqing Institute of Geology and Mineral Resources, Chongqing 400042, P.R. China 3College of Chemical Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, P.R. China
Received: October 22, 2018 Accepted: February 18, 2019 Publication Date: June 1, 2019
The freezing and thawing of soils have been extensively researched, but little effort has been devoted to addressing the freezing evolution process of rock mass. In this paper, a novel approach for the multi-physics constitutive models considering the change of the elastic modulus and linear expansion coefficient were developed and employed. The proposed coupling model was successfully integrated into Abaqus to simulate the freezing process of rock mass with reasonable results. The simulation results indicate that the pore water will gradually freeze into the pore ice, which will fill the pore space of the sandstone, so that the overall volume of the sandstone increases significantly. Moreover, combined with previous physical experimental studies, it also can be concluded that low temperature freezing can significantly improve the pore structure and mechanical properties of frozen sandstone. Especially, the increased absolute porosity may not be recovered after the ice lenses melts, which may cause serious irreversible frost damage to the internal structure of the sandstone. The finite element module can be used to predict the change of temperature, unfrozen water content, ice lens content, pore structure and volumetric deformation of rock mass during freezing, which can be used to accurately evaluate the effect of frost heave on the internal structure of rock mass. The study provides a theoretical basis and reference for the design and maintenance of cold region engineering and cryogenic reservoir stimulation.
Keywords: Rock Mass, Low Temperature, Freezing Evolution, Internal Structure, Multi-physics Field Coupling
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