报告承办单位：土木工程学院

报告内容：Calibration of BBM Parameters Using the Modified State Surface Approach

报告人姓名：Xiong Zhang

报告人所在单位：Missouri University of Science and Technology

报告人职称/职务及学术头衔：教授

报告时间：6月20日（周四）10:00

报告地点：工科二号楼B302

报告人简介：Dr. Xiong Zhang is a Professor in the Department of Civil, Architectural, and Environmental Engineering at the Missouri University of S&T. He received his Ph.D. degree in Civil Engineering from Texas A&M University. Dr. Zhang has been teaching and conducting research in the field of geotechnical engineering since 1992. His studies focus on development of advanced laboratory techniques to rapidly characterize geomaterials, constitutive modeling coupled hydro-mechanical behavior of unsaturated soils, numerical modeling of climate-soil-structure interaction, slope stability analysis, soil stabilization and ground improvement, and frozen ground engineering. Dr. Zhang is currently Chair of ASCE Geo Institute Shallow Foundation Committee, Voting Member of TC106 Unsaturated Soils within the International Society for Soil Mechanics and Geotechnical Engineering (one of two Voting Members in North America), Associate Editor for ASCE Journal of Cold Region Engineering, and editorial board member of Canadian Geotechnical Journal. He also serves as the committee member of several nationwide technical committees. He received the 2016 International Innovation Award in Unsaturated Soil Mechanics from TC106 Committee on Unsaturated Soils within the ISSMGE.

报告摘要：The Barcelona Basic Model (BBM) developed by Alonso et al. (1990) is the first and the most widely used elasto-plastic model for unsaturated soils. The BBM successfully explained many key features of unsaturated soils and received extensive acceptance. However, there is lack of a well-established method for selecting parameter values for the BBM from laboratory tests, although a variety of methods have been recently developed for calibrating model parameters for the BBM. Concerns still exist on the correctness and robustness of such parameter value selection procedures. In this presentation, a novel approach was proposed to calibrate the parameter values for the BBM, which takes advantage of the close-form solution of the BBM, based upon a newly proposed Modified State Surface Approach to study the unsaturated soils. The same experimental data, used in the MUSE benchmark exercise, were reanalyzed using the proposed approach, and the results were compared with those in the MUSE benchmark exercise from which the simplicity, effectiveness, and robustness of the proposed method were evaluated.