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Advances in Civil Engineering
Volume 2018, Article ID 4068918, 10 pages
Research Article

An Experimental Study on Cracking Behavior of Precracked Sandstone Specimens under Seepage Pressure

1School of Resources and Safety Engineering, Central South University, Changsha, Hunan 410083, China
2School of Civil, Environmental and Mining Engineering, The University of Western Australia, Perth, WA 6009, Australia

Correspondence should be addressed to Qibin Lin; nc.ude.usc@nilbq

Received 13 November 2017; Accepted 17 January 2018; Published 11 March 2018

Academic Editor: Constantin Chalioris

Copyright © 2018 Qibin Lin et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper aims to investigate the strength and failure mechanism of fractured rock under seepage pressure. For this purpose, precracked sandstone specimens were prepared with different fissure angles, and a seepage pressure loading device was created. Together with the acoustic emission (AE) system, the loading device was adopted to perform uniaxial compression tests with or without seepage pressure. The main results are as follows. Combined with axial stress-strain curves, photographic monitoring results and the output of AE counts and rock failure process can be generally divided into four stages: microcrack closure, elastic deformation, crack growth and propagation, and final failure. The seepage pressure had a significant effect on the mechanical properties of the specimens: the specimens under seepage pressure lagged far behind those without seepage pressure in peak strength but maintained a comfortable lead in peak strain. Under seepage pressure, the typical failure features of the specimens varied with the fissure angles: the specimens with small fissure angles (i.e., [0°,30°]) mainly underwent tensile failure; those with medium fissure angles (i.e., [30°,60°]) suffered from shear failure; and those with large fissure angles (i.e., [60°,75°]) were prone to tensile-shear failure.