Experimental Study on the Dilatancy Characteristics and Permeability Evolution of Sandstone under Different Confining Pressures

Chao Liu, Yixin Liu (), Zhicheng Xie and Beichen Yu
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Chao Liu: School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China
Yixin Liu: State Key Laboratory of Mining Disaster Prevention and Control, Ministry of Education, Qingdao 266590, China
Zhicheng Xie: China Construction First Group Construction & Development Co., Ltd., Beijing 100102, China
Beichen Yu: State Key Laboratory of Mining Disaster Prevention and Control, Ministry of Education, Qingdao 266590, China

Sustainability, 2023, vol. 15, issue 20, 1-17

Abstract: It is of practical significance to investigate the dilatancy and seepage characteristics of tight sandstone gas under different confining pressures for its efficient development. Therefore, fluid–solid coupling triaxial loading experiments with gas-bearing sandstone were conducted. The results showed that the gas-bearing sandstone exhibited brittle characteristics with tensile–shear composite failure. The dual logarithmic model can better characterize the sandstone strength ( R 2 = 0.9952), whereas the fitting effect of the linear Mohr–Coulomb criterion is poor ( R 2 = 0.9294). The dilatancy capacity of sandstone was negatively correlated with confining pressure, and the dilatancy index decreased by 38.4% in the form of its convex power function with the increasing confining pressure. The sandstone underwent significant damage dilatancy during the yielding stage, resulting in a significant permeability recovery, with an increase of 67.0%~70.4%, which was greater than the decrease of 9.6%~12.6% in the elastic stage. In view of the different dominant factors of permeability reduction induced by pore compaction and recovery induced by crack development, the permeability model was established with volumetric strain and radial strain as independent variables, which could better reflect the whole process of permeability evolution.

Keywords: dilatancy; permeability model; volumetric strain; damage (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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