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Mathematical Problems in Engineering
Volume 2015 (2015), Article ID 153648, 34 pages
http://dx.doi.org/10.1155/2015/153648
Research Article

Research on the Hard-Rock Breaking Mechanism of Hydraulic Drilling Impact Tunneling

1College of Mechanical Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China
2Shanxi Key Laboratory of Fully Mechanized Coal Mining Equipment, Taiyuan, Shanxi 030024, China
3School of Mechanical Engineering and Automation, Northeastern University, Shenyang, Liaoning 110004, China

Received 19 May 2015; Revised 21 July 2015; Accepted 26 July 2015

Academic Editor: Francesco Franco

Copyright © 2015 Risheng Long 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.

Abstract

In order to realize the rapid hard-rock tunneling in a safe, highly effective, and economic manner, the hydraulic drilling impact hard-rock tunneling (HDIHT) technology and method were introduced based on the theories of rock mechanics and hydraulic impact. The key parameters, including drilling radius and impact distance, were researched to reveal the stress behavior during HDIHT process. The Von Mises equivalent stress and its principal stress components were analyzed, and the breaking mechanism of HDIHT was also discussed. The simulation results show that, to ensure the effectiveness of “secondary breaking” caused by drilling hole free surfaces, the impact distance should not exceed 200 mm, and the optimal drilling radius was about 35 mm.