Failure Behavior of Thin Disc Sandstone under Coupled Bending-Seepage Condition
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A floor aquifuge usually bends and fails when mining above a confined aquifer, which may lead to water inrush disaster.
The floor aquifuge was simplified as a thin disc model in this paper, and a series of coupled bending-seepage tests of sandstone were carried out by a patent test system.
The variation characteristics of load-displacement, load-time, and permeability-time were analyzed.
The deflection and stress in the thin disc rock samples were deduced; the initiation and propagation of cracks were analyzed.
The failure behavior of the thin disc rock samples was described.
It shows the following: (1) The bending failure behavior relates to the stress distribution and crack evolution inside the thin disc.
(2) The main cause of crack initiation is a tension-shear failure.
(3) The 5 mm thickness thin discs form petal-shaped cracks, due to tensile stress, while petal-shaped cracks only appear at the cap block of the 10 mm discs, which are sheared into two pieces along the conical surface with an inclination about 45°.
(4) Water inrush occurs after bending failure in the floor aquifuge, and it is an opportune moment to grout along the crack propagation trend lines to prevent the water inrush disasters.
American Psychological Association (APA)
Wang, Luzhen& Kong, Hailing. 2020. Failure Behavior of Thin Disc Sandstone under Coupled Bending-Seepage Condition. Geofluids،Vol. 2020, no. 2020, pp.1-15.
Modern Language Association (MLA)
Wang, Luzhen& Kong, Hailing. Failure Behavior of Thin Disc Sandstone under Coupled Bending-Seepage Condition. Geofluids No. 2020 (2020), pp.1-15.
American Medical Association (AMA)
Wang, Luzhen& Kong, Hailing. Failure Behavior of Thin Disc Sandstone under Coupled Bending-Seepage Condition. Geofluids. 2020. Vol. 2020, no. 2020, pp.1-15.
Includes bibliographical references
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