This volume discusses a compilation of studies regarding transportation geotechnics, geomechanics, rock mechanics, and geosynthetics reinforced soils from the 6th GeoChina International Conference held in NanChang, China, July 19-21, 2021.

?Dr. S. Sonny Kim is an associate professor of Civil Engineering at the University of Georgia. Dr. Kim received his M.S. from Georgia Tech in 2000 and Ph.D from Texas A&M University in 2004. Kim's primary research has focused on transportation geotechnics, geosynthetics-reinforced pavement foundation, and performance evaluation of aggregate/subgrade layers using nondestructive test (NDT). Before joining the academia, Dr. Kim has been an integral contributor to several nationwide highway/airport pavement design and construction projects.
Dr. Kim is Fellow of the ASCE and he was also named Distinguished Faculty Fellow by College of Engineering from the University of Georgia. Dr. Kim is an active member of American Society of Civil Engineers (ASCE) G-I Highway Pavement Committee, ASCE T&DI Committee, and Transportation Research Board (TRB) AKP 20 and AKM 80 Committee. Dr. Kim is a licensed professional engineer and has written over 100 refereed articles and reports.
Prof Arif is an active Consultant, Researcher and Academician. He obtained his PhD from Indian Institute of Science, Bangalore, India. Prof Arif is currently an Associate Professor in the Department of Civil Engineering at National Institute of Technology, Warangal, India and had worked earlier at King Saud University, Riyadh, Saudi Arabia.He was responsible for establishing state-of-the-art Geoenvironmental Engineering Laboratoryin the Department of Civil Engineering at King Saud University, Riyadh, during his tenure there. He is an active member of American Society of Civil Engineers (ASCE) and Indian Geotechnical Society (IGS).Prof Arif has authored, co-authored over one hundred articles in peer reviewed journals, book chapters, and conference proceedings.(ORCID: 0000-0001-8623-7102).
Professor JialiangYao is deputy director of Institute of transportation economy and professor of Materials Department of School of transportation engineering of Changsha University of technology. He is a professional registered road supervision engineer, and his research direction is pavement engineering and pavement materials. He completed his undergraduate and graduate studies in Hunan University, China. He has written, Co- authored and edited 45 journal papers, 12 monographs and textbooks (author / co-author / Editor) and 20 conference papers. He presided over and participated in 26 provincial and ministerial level projects, and served as a technical consultant for several expressway projects.

Autorentext
Dr. S. Sonny Kim is an associate professor of Civil Engineering at the University of Georgia. Dr. Kim received his M.S. from Georgia Tech in 2000 and Ph.D from Texas A&M University in 2004. Kim's primary research has focused on transportation geotechnics, geosynthetics-reinforced pavement foundation, and performance evaluation of aggregate/subgrade layers using nondestructive test (NDT). Before joining the academia, Dr. Kim has been an integral contributor to several nationwide highway/airport pavement design and construction projects. 
Dr. Kim is Fellow of the ASCE and he was also named Distinguished Faculty Fellow by College of Engineering from the University of Georgia. Dr. Kim is an active member of American Society of Civil Engineers (ASCE) G-I Highway Pavement Committee, ASCE T&DI Committee, and Transportation Research Board (TRB) AKP 20 and AKM 80 Committee. Dr. Kim is a licensed professional engineer and has written over 100 refereed articles and reports.
Prof Arif is an active Consultant, Researcher and Academician. He obtained his PhD from Indian Institute of Science, Bangalore, India. Prof Arif is currently an Associate Professor in the Department of Civil Engineering at National Institute of Technology, Warangal, India and had worked earlier at King Saud University, Riyadh, Saudi Arabia.He was responsible for establishing state-of-the-art Geoenvironmental Engineering Laboratoryin the Department of Civil Engineering at King Saud University, Riyadh, during his tenure there.  He is an active member of American Society of Civil Engineers (ASCE) and Indian Geotechnical Society (IGS).Prof Arif has authored, co-authored over one hundred articles in peer reviewed journals, book chapters, and conference proceedings.(ORCID: 0000-0001-8623-7102).
Professor JialiangYao is deputy director of Institute of transportation economy and professor of Materials Department of School of transportation engineering of Changsha University of technology. He is a professional registered road supervision engineer, and his research direction is pavement engineering and pavement materials. He completed his undergraduate and graduate studies in Hunan University, China. He has written, Co- authored and edited 45 journal papers, 12 monographs and textbooks (author / co-author / Editor) and 20 conference papers. He presided over and participated in 26 provincial and ministerial level projects, and served as a technical consultant for several expressway projects. 

Inhalt
Research on Soil Characteristics and Controlling Technology of Differential Deformation of Expressway Widening Subgrade in Seasonal Frozen RegionDeveloping an Efficiency Equation for Tapered Pile Groups in Sand Using Mathematical and Numerical AnalysesAnalysis of the swelling shrinkage cracks development rules of improved expansive soil based on image processing technologyTemperature spatial and temporal distributions of pavements with various paving materialsUsed Paper Fibers for Sustainably Enhancing the MICP Stabilization of SandA field study on the utilization of recycled concrete aggregate in drainage systemsApplication of Lightweight Soil as Sustainable Backfill for Railway Bridge Approach ZoneNumerical Modeling of Grout Injection for Hybrid Bored Prestressed Concrete Cased Piles