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Advances in Materials Science and Engineering
Volume 2018, Article ID 7915652, 9 pages
https://doi.org/10.1155/2018/7915652
Research Article

Study on Failure Process and Permeation Evolution of Single-Cracked Rock

College of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, China

Correspondence should be addressed to Weitao Liu; moc.621@twldks

Received 23 November 2017; Revised 23 March 2018; Accepted 5 April 2018; Published 16 April 2018

Academic Editor: Fernando Lusquiños

Copyright © 2018 Xiangxi Meng and Weitao Liu. 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.

Abstract

To evaluate the mechanical properties and permeation evolution of cracked rock mass, failure evolution tests were designed by RFPA software for single-cracked rock mass with (i) different inclination angles under uniaxial compression and (ii) different confining pressures and pore pressures under triaxial compression. The results show the following: (1) Angle of the crack significantly affects the crack propagation mode and slightly affects the bearing capacity of rock. During the crack propagation, the peak of permeation is delayed at the peak of stress. The stress-strain curve shows a different behavior in the postcritical part of the curve, especially in the case of 45°, where a smooth postcritical curve was clearly observed instead of an abrupt decrease in the stress of other two cases. (2) When the confining pressure is constant, the trend is almost the same when varying pore pressures, and with the increase in pore pressure, crack propagation is accelerated. At a low confining pressure, the crack is extended vertically to the upper and lower ends of the specimen, forming a longitudinal macroscopic crack. At a high confining pressure, the crack gradually extends to the left and right boundaries of the specimen, forming a transverse macroscopic crack. (3) The rate of crack initiation and destruction first decreases and then increases with the increase in confining pressure when pore pressure is constant.