American Rock Mechanics Association Posted on May 20, 2014 by SCG DR Copyright Holders: American Rock Mechanics Association a Self-archiving policy Conditions Accepted version: √ a Published version: √ a Remarks: You have permission to archive papers authorized by staff members as you request below. You may archive all versions. Please attribute properly to the American Rock Mechanics Association. (verified by Zhao Yue via email) Verification Date: 20.05.2014