Mechanical Damage and Failure Behavior of Shaft-Lining Concrete after Exposure to High Pore-Water Pressure
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 1
Abstract
In order to investigate the effects of high pore-water pressure on the mechanical damage and failure behavior of mine shaft–lining concrete, specimens were immersed in a high-water-pressure container (up to 10 MPa) to form a high hydraulic gradient similar to that present in shaft-lining concrete in deep aquifers. The acoustic-wave velocity, strength, elastic modulus, and microcrack propagation were correlated through a mixed orthogonal experimental scheme in which the water pressure, exposure time, and concrete strength, were varied over 16 tests. The experimental results indicate that high pore-water pressure accelerates the damage process of shaft-lining concrete, resulting in increased modulus of elasticity, decreased peak strength with increasing water pressure and exposure time, and greater microcrack propagation in lower-strength-grade concrete (e.g., C60). In addition, most of the specimens failed by shear cracking. A damage evolution equation and constitutive model of shaft-lining concrete under uniaxial compression considering the effects of high pore pressure is established. The model shows good agreement with the experimental results.
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Acknowledgments
This research was supported by the National Natural Science Foundation of China (No. 51674006) and the Anhui University Discipline (Professional) Talented Person (No. gxbjZD09), Anhui Provincial Natural Science Foundation Youth Project (1908085QE185), Anhui Provincial College of Natural Science Research Key Project (KJ2018A0098), Project funded by China Postdoctoral Science Foundation (2018M642502), and the Science Research Foundation for Young Teachers in Anhui University of Science and Technology (QN2017211).
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©2019 American Society of Civil Engineers.
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Received: Apr 25, 2018
Accepted: May 29, 2019
Published online: Nov 11, 2019
Published in print: Jan 1, 2020
Discussion open until: Apr 11, 2020
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