China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031, China
Published date: 30 Apr 2018
Copyright
2018 2018 THE AUTHORS. Published by Elsevier LTD on behalf of Chinese Academy of Engineering and Higher Education Press Limited Company. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).