Seepage dynamics and damage characteristics of shaft lining concrete under hydraulic coupling

Authors

XUE Weipei, State Key Laboratory for Safe Mining of Deep Coal Resources and Environment Protection, Anhui University of Science and Technology, Huainan 232001, China; School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China; National Engineering Laborary for Deep Shaft Construction Technology in Coal Mine, Anhui University of Science and Technology, Huainan 232001, ChinaFollow
ZHOU Yaya, School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China; Anhui Construction Engineering Sanjian Group Co., Ltd., Hefei 230031, Chinaa
CHENG Hua, School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China; National Engineering Laborary for Deep Shaft Construction Technology in Coal Mine, Anhui University of Science and Technology, Huainan 232001, China
YAO Zhishu, State Key Laboratory for Safe Mining of Deep Coal Resources and Environment Protection, Anhui University of Science and Technology, Huainan 232001, China; School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China; National Engineering Laborary for Deep Shaft Construction Technology in Coal Mine, Anhui University of Science and Technology, Huainan 232001, China
RONG Chuanxin, State Key Laboratory for Safe Mining of Deep Coal Resources and Environment Protection, Anhui University of Science and Technology, Huainan 232001, China; School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China; National Engineering Laborary for Deep Shaft Construction Technology in Coal Mine, Anhui University of Science and Technology, Huainan 232001, China
WANG Zhongjian, School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China
WU Hao, School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China

Abstract

Objective Concrete serves as a lining material for support structures used in vertical shafts in coal mines, and its seepage performance and mechanical characteristics play a crucial role in ensuring structural safety. Furthermore, shaft lining concrete is placed under the groundwater level, subjected to a stress environment significantly different from that of surface concrete.Methods To investigate the impacts of groundwater seepage on the performance of shaft lining concrete under triaxial stress conditions, hydraulic coupling tests were conducted using a servo pressure testing machine equipped with a seepage apparatus, yielding data on permeability, elastic volumetric strain, crack volumetric strain, and damage mechanics at various positions.Results and Conclusions The permeability evolution of the concrete experienced three distinct phases: downward, stable, and upward. The downward phase accounted for 6.93% of the stress-strain curves before the permeability peak appeared, with the permeability decreasing by 32.21% to 67.14%. The stable phase indicates that the specimens remained in an elastic state. The upward phase was characterized by an increase in the number of internal cracks, with the permeability increasing by 17.55 times at most. Using the elastic phase as a boundary, two mathematical models were constructed to describe the variations of permeability before and after the elastic phase with stress, following an exponential function and a power function, respectively. The crack initiation and damage stress points during the loading process of the shaft lining concrete were determined based on the characteristics of volumetric strain curves. As pore water pressure increased under the same confining pressure, the initial permeability increased by 48.94% on average, while the crack initiation stress, damage stress, and peak stress decreased by 5.60% on average. As the confining pressure rose under the same pore water pressure, the initial permeability decreased by16.62% on average, while the crack initiation stress, damage stress, and peak stress increased by 25.55% on average. During triaxial compression, the permeability of the concrete showed a similar evolutionary pattern to its damage progression, with the damage acceleration point appearing slightly earlier than the permeability increase point. Accordingly, a calculation model illustrating the relationships of permeability with damage and pore water pressure was developed. The results of this study serve as a significant reference for improving the multi-field coupling theory for the lining engineering of vertical shafts in coal mines and ensuring the engineering safety.

Keywords

coal mine, vertical shaft, shaft lining concrete, triaxial compression, seepage dynamics, damage mechanical property

DOI

10.12363/issn.1001-1986.25.07.0499

Recommended Citation

XUE Weipei, ZHOU Yaya, CHENG Hua, et al. (2026) "Seepage dynamics and damage characteristics of shaft lining concrete under hydraulic coupling," Coal Geology & Exploration: Vol. 54: Iss. 2, Article 13.
DOI: 10.12363/issn.1001-1986.25.07.0499
Available at: https://cge.researchcommons.org/journal/vol54/iss2/13

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