Keynote Speakers

 

Musharraf Zaman, Ph.D., P.E.

University of Oklahoma
Director-Southern Plains Transportation Center (SPTC)

 

 

Dr. Musharraf Zaman is the Aaren Alexander Professor of Civil Engineering and Environmental Science and Alumni Chair Professor of Petroleum and Geological Engineering at the University of Oklahoma. (OU). He has been serving as the Director of the Southern Plains Transportation Center (SPTC) – a consortium of eight universities in U.S. DOT Region 6 – for more than three years. He serves as the Editor-in-Chief of the International Journal of Geomechanics, ASCE and as the Executive Vice President of the International Association for Computer Methods and Advances in Geomechanics (IACMAG). He served as the Associate Dean for Research and Graduate Programs in OU College of Engineering for more than eight years.

Dr. Zaman has more than 35 years of experience in the areas of pavement materials and systems, geotechnical engineering, and geomechanics. During his tenure at OU, he has received more than $30 Million in external funding, developed two new laboratories (Broce Asphalt Laboratory and Asphalt Binders Laboratory), and published 172 journal and 224 peer reviewed conference proceedings papers and 12 book chapters. His projects have been funded by NSF, Federal Highway Administration, U.S. Department of Transportation, Oklahoma Department of Transportation, and the private sector. His work on intelligent compaction, along with co-workers, has been funded heavily by the private sector and received patents. He has supervised more than 80 master theses and doctoral dissertations to completion. His research papers have own international-level awards from IACMAG and Indian Geotechnical Society.

PRESENTATION TITLEClimate-Adaptive Surface Transportation Infrastructure: Development and Implementation of Innovative Technologies and Practices

PRESENTATION SUMMERY – With increased frequency and level of severe weather and climate extremes, innovative technologies and practices have become a key factor in developing and maintaining sustainable transportation infrastructure (pavements, bridges, and embankments). The Southern Plains Transportation Center (SPTC) – a consortium of eight universities in U.S. DOT Region 6 (Arkansas, Louisiana, New Mexico, Oklahoma, and Texas) – has been developing innovative technologies, materials, and methods for design, construction, maintenance, and monitoring of climate-adaptive transportation infrastructure. Examples include: web-based routing to reduce pavement damage; rapid and cost-effective rehabilitation; mixture design for pumpable concrete for extreme weather; intelligent compaction for real-time monitoring of compaction quality; risk-based life cycle management; and connected vehicle technology for severe weather warning. This presentation will provide an overview of some of the technologies and practices, with a focus on implementation.

 

Rongji Cao, Ph.D.

Chief Engineer- JSTI Group

 

 

Dr. Rongji Cao is a Chief Engineer of JSTI Group and an Executive Director for the National Engineering Laboratory of Advanced Road Materials (NLARM). He earned his Ph.D. degree from Southeast University in Road and Railway engineering. He has over 20 years of experiences on asphalt mixture design, quality control, pavement rehabilitation, asset management and new road materials. He has published over 50 papers and has 9 patents in recent years. He also engages in implementation of asphalt rubber in China and the asphalt rubber ambassador of Rubber Pavements Association (RPA). Dr. Cao is a technical member of World Road Association (PIARC), and member of International Society for Asphalt Pavements (ISAP).

PRESENTATION TITLELessons Learned From Last 20 yrs of Superpave Implementation in China

PRESENTATION SUMMERY – Superpave technology has been introduced to China for more than 20 years. Superpave technology has improved asphalt pavement qualities drastically in China. Superpave asphalt binder specification has been accepted by most highway agencies. This presentation will summarize the lessons learned and challenges we have overcome.

  • In most cases, Ndesign is 100 times for heavy duty pavement, not 125 times. Chinese mixture performance tests are used to verify Superpave mixture.
  • The Superpave mixture method has been adopted by 20 provinces.
  • SMA + Superpave structure has become one of the most typical structures of heavy traffic highway pavements.
  • There are more than 250 SGCs, and more than 40 sets of Superpave Blinder equipment in China. The product standard and product verification regulation of SGC were established.
  • Over 10,000 km of highways were constructed based on Superpave technology. LTPP study shows that Superpave pavements have excellent road performances, especially the resistance to rutting.
  • Superpave has been integrated into China's asphalt pavement technology. Refinements were made to fit local Chinese conditions.
 

Subhamoy Bhattacharya, Ph.D.

University of Surrey, United Kingdom
Chair in Geomechanics, Director of Surrey Advanced Geotechnical Engineering (SAGE) Lab Institute

 

 

Professor Bhattacharya currently holds the Chair of Geomechanics and directs SAGE (Surrey Advanced Geotechnical Engineering) laboratory, a specialized soil mechanics/geotechnical engineering laboratory for research and industrial testing. He is also the Programme Director for the specialized MSc course on Advanced Geotechnical Engineering. He is also adjunct professor at Zhejiang University (China) and Visiting Fellow at the University of Bristol (UK). Previously, Professor Bhattacharya held academic posts at: University of Bristol (Senior Lecturer in Dynamics), University of Oxford (Departmental Lecturer), Junior Research Fellow (Somerville College, Oxford), 21st Century Centre of Excellence Fellow (Tokyo Institute of Technology). Professor Bhattacharya spend happy years in Industry: Jacobs- CES (Consulting Engineering Services, India) and Fugro Geo-consulting (UK). His research interests are in dynamic soil-structure interaction (both in earthquake and offshore), earthquake geotechnical engineering and advanced soil element testing. He has more than 20 years’ professional and research experience in the behaviour and design of foundations in extreme environments. He has recently published over 25 papers on the dynamics of wind turbines including Soil-Structure Interaction and an integrated design method for the design of monopiles. He wrote one text book: Foundation design for offshore wind turbines (Wiley) and co-authored two text books: Fundamental of Engineering Mathematics (ICE-Thomas Telford Publishing) and Seismic design of foundations: Concepts and Applications (ICE-Thomas Telford Publishing).

PRESENTATION TITLEScaling of Models Tests in Geotechnical Engineering: Do’s and Don’ts and Thumb Rules

PRESENTATION SUMMERY – Scaled model tests such as single gravity or N-g (in a Centrifuge) are routinely used to design geotechnical structures or to verify different failure mechanisms or processes or to study Dynamic Soil Structure Interactions. There are often confusions and debates on the applicability of these test results and on their usefulness especially related to direct scaling of results. The aim of the lecture is to demystify the scaling of results from scaled model tests through various examples. The example will include soil-structure interaction from earthquake geotechnical engineering as well as offshore geotechnical engineering. Few examples are pipe-soil interaction crossing active seismic faults, pile-soil interaction in liquefiable as well as non-liquefiable soils, foundations for offshore wind turbines including the dynamics. The lecture will place special emphasis on offshore wind turbine foundations due the high level of interest in this area not only in Europe but also in Asian countries and America.

In this context, it is important to state that large scale Offshore Wind Farms has emerged as a critical renewable energy technology to reduce GHG (Green House Gas) emission and autonomy in energy production. Each of these wind farms consist of many Wind Turbine Generators (WTG) mounted on a support structure and are capable of generating up to 1.2GW of power. These are relatively new technological advancements which are installed in harsh offshore environments. Naturally, the design of foundations for such structures are challenging. Furthermore, WTG support structures due to its shape and form (heavy rotating mass at the top of a slender tower) are dynamically sensitive in the sense that the natural frequency of such system is very close to the forcing frequencies acting on them. The aims of the keynote lecture will be to discuss the challenges in designing foundations for such structures and how scaled model tests can help. Specifically, the rationale behind scaled models tests that supported the development of offshore Wind Turbine design philosophy will be discussed. Methods to scale the such model tests for predicting prototype consequences will be illustrated. While there are no track record of long term performances of these new structures, design and construction of these must be carried out for 25 to 30 years and it is argued that scaled model tests are necessary. Finally, the lecture will conclude that well thought out scaled models tests can be effective in predicting the long-term issues and engineers must also need to learn from other disciplines.

 

Yuanqiang Cai, Ph.D.

President of Zhejiang University of Technology, China

 

 

Professor Cai is a Professor of Geotechnical Engineering at the Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University. He also served as the president of Zhejiang University of Technology during the pasted three years (2015-2017). His research field includes Soil Dynamics, Ground Treatment, and Foundation Engineering. He have Published a monograph “Solutions for Biot’s Poroelastic Theory in Key Engineering Fields” and Published more than 70 SCI-indexed research papers in peer reviewed journals including Géotechnique, Canadian Geotechnical Journal, Journal Geotechnical and Geoenvironmental Engineering (ASCE) and Journal of Engineering Mechanics(ASCE). He is on the editorial board for several journals including the Chinese Journal of Geotechnical Engineering, Journal of Vibration Engineering and Journal of Zhejiang University Science (A). He was awarded the National Scientific and Technology Progress Award, Second Prize, awarded by State Council of P.R. China, 2013, and the Scientific and Technology Progress Award of Zhejiang Province, First Prize, awarded by People’s Government of Zhejiang Province, China, 2012.

PRESENTATION TITLEDeformation of soft soils subjected to large-number cyclic traffic loadings

PRESENTATION SUMMERY – The dynamic stress field induced by traffic loading applied on soil elements may be three-dimensional in many cases. Cyclic loading induced by traffic loadings will give rise to the cyclic variation of normal stress components of all three directions, including one vertical and two horizontal ones. The cyclic horizontal normal stress perpendicular to the driving direction is considered to be negligible compared to the other one parallel to the driving direction. The aim of the lecture is present a systematic experimental study on the one-way cyclic behavior of saturated clays in three-dimensional stress state, considering several factors including the cyclic shear stress ratio (CSR), overconsolidation ratio (OCR) and coefficient of cyclic intermediate principal stress (bcyc). The lecture will place special emphasis on the effects of the above factors on the characteristics of major and intermediate principal strains, and resilient modulus.

In this context, the test apparatus of true triaxial apparatus will be introduced first. The effects of cyclic shear stress ratio will be discussed within the framework of shakedown theory. An improved shakedown theory is proposed to classify the cyclic response of saturated clays under traffic loading. The allowable stress ratio, which can be employed as a reference for the deformation control criterion in road engineering, is determined based on both the deformation and resilient modulus behaviors. The coupling of cyclic vertical normal stress and cyclic horizontal normal stress parallel to the driving direction is simulated by the combination of cyclic major and intermediate principal stresses in the cyclic true triaxial tests, a parameter of bcyc termed the coefficient of cyclic intermediate principal stress is introduced to characterize the coupling. The effects of the bcyc on the permanent major principal strain, permanent intermediate principal strain, strain path and resilient modulus will be investigated. A quantitative relationship is established between the permanent major strain and bcyc, and a model which can predict the deformation of saturated clays under one-way cyclic loading is proposed considering both bcyc, OCR and cycle number N. A critical value of bcyc≈0.5, at which the permanent intermediate principal strain changes the direction from tension to compression, is observed. The influences of cyclic intermediate stress on the resilient modulus are also significant and linear relationships are found between resilient modulus and bcyc. Finally, the effects of OCR will be discussed.