ylzzcom永利总站线路检测讲座:Modeling Unsaturated Granular Subgrade Material Behavior and Its Effects on Pavement Deformation
报告题目：Modeling Unsaturated Granular Subgrade Material Behavior and Its Effects on Pavement Deformation（非饱和粒状路基填料特性模拟及其对路面变形的影响）
报告人：Balasingam Muhunthan（华盛顿州立大学）
时间： 2019年7月8日（星期一）9:00-10:30
地点：珠海校区行政楼3楼321（ylzzcom永利总站线路检测会议室）
欢迎广大师生踊跃参加！
主讲人简介：
Balasingam Muhunthan, Ph.D., P.E., F. ASCE, is Professor and Chair of the Department of Civil and Environmental Engineering at Washington State University in Pullman, WA, USA. He is also the Founder and Director of the Washington Center for X-ray Computed Tomography and the Director of Washington State Transportation Research Program at WSU. He has held visiting professorships at Cambridge University, the University of Auckland, and the Georgia Institute of Technology.
Dr. Muhunthan received his undergraduate degree in Civil Engineering from the University of Peradeniya, Sri Lanka, and his MS and Ph.D. in Civil Engineering from Purdue University. Dr. Muhunthan’s expertise is in the areas of computational and experimental geomechanics. He has worked on a wide range geotechnical engineering areas including landslides, dam failures, micropiles, horizontal drains for slopes, and rock fall protection measures. Dr. Muhunthan has an extensive publication record in his areas of research.
Dr. Muhunthan has received several awards for his scholarly accomplishments. He is a recipient of all of the three top CEE Departmental awards at WSU; Outstanding Teaching, Excellence in Research, and the Leon Luck Most Effective Professor Awards. He also received the Outstanding Teacher Award from the College of Engineering and Architecture at WSU, the Crampton Prize by the Institution of Civil Engineers, UK, International Fellowship Award from the National Science Foundation, Fellowships from Churchill College Cambridge, Purdue University, and Merit Scholarship from Peradeniya University. Dr. Muhunthan is a member of the Soil Properties and Modeling Committee of ASCE and serves on the editorial advisory board of the International Journal of Geomechanics. He was an editor of the Geotechnical News Magazine, has chaired many national and international conferences, and has presented a number of invited lectures in constitutive modeling of geomaterials.
内容简介：
Subgrade granular materials undergo repeated loading and their response influences the fatigue and rutting of asphalt concrete pavements. Granular materials exhibit a wide range of mechanical behavior that depends on their composition and fabric, stress history, density, and the nature of the applied force. In addition, most subgrade materials are unsaturated and their behavior is dependent on suction and water content. Subgrades with different moisture contents experience different suction force that affects their performance. However, this effect has traditionally been difficult to be quantified using either empirical or mechanistic methods.
A new constitutive model for sands that accounts for their unsaturated behavior is presented. It is based on critical state and bounding surface concepts and incorporates parameters that account for sand fabric and suction. The model is implemented into ABAQUS finite element software using UMAT subroutine. A 3-D FE model was developed to simulate response of pavements subgrades under differing vehicular loading magnitudes, asphalt and base properties, and saturation levels. It is shown that moduli of asphalt and base and saturation level of subgrades, were found to influence the vertical deformation experienced near the top of subgrade, especially at high wheel loads, but their influence gradually reduced with depth.
