1. Faculty of Engineering, China University of Geosciences, Wuhan, China
2. National Institute of Standards and Technology, Gaithersburg, MD, USA
3. Key Laboratory of Geotechnical and Underground Engineering of Minister of Education and Department of Geotechnical Engineering, Tongji University, Shanghai, China
4. Center for Technology and Systems Management, Department of Civil and Environmental Engineering, University of Maryland, College Park, MD, USA