Li / Zhao Loess and Loess Geohazards in China

Erscheinungsjahr 2017
ISBN: 978-1-351-70993-4
Verlag: Taylor & Francis
Format: PDF
Kopierschutz: Adobe DRM (»Systemvoraussetzungen)

E-Book, Englisch, 178 Seiten

As a newly formed sediment, loess covers about 10% of the Earth's surface area. The loess covered areas are regions of dense industrial and agricultural development and population concentration in the World, and are also significant in wheat production. This book represents a valuable addition to the literature on loess geology. It details the origin, formation, landform, structure, strength and geohazards of loess, and gives an overall and in-depth view of loess. It will be of value to readers interested in Earth Sciences, Environmental Sciences, Ecology, Sociology and other related subjects.

Autoren/Hrsg.

Li, Yanrong

Zhao, Jingui

Li, Bin

Fachgebiete

• Technische Wissenschaften Bauingenieurwesen Bauingenieurwesen
• Technische Wissenschaften Bauingenieurwesen Boden- und Felsmechanik, Geotechnik
• Naturwissenschaften Agrarwissenschaften Agrarwissenschaften

Inhaltsverzeichnis

1 Origin and Spatial Distribution of Loess
1.1 Introduction
1.2 Definition of Loess
1.3 Evidence of Aeolian Origin of Loess
1.3.1 Material composition
1.3.2 Spatial zoning of grain size
1.3.3 Materials of the source area
1.3.4 Transport mode
1.3.5 Process of formation and evolution
1.4 Spatial Distribution
1.4.1 Distribution of loess in the world
1.4.2 Distribution of loess in China
References

2 Loess Landforms
2.1 Introduction
2.2 Platforms (Yuan)
2.3 Ridges (Liang)
2.4 Hillocks (Mao)
2.5 Gully
2.6 Secondary Landforms
2.6.1 Dish
2.6.2 Crater
2.6.3 Wall and Column
2.7 Formation and Evolution of Loess Landform
References

3 Loess Microstructure
3.1 Microstructural Characteristics
3.1.1 Particle size and shape
3.1.2 Occurrences of particles
3.1.3 Particle contacts
3.1 4 Cementation characteristics
3.1.5 Particle arrangements and pore characteristics
3.2 Classification of Microstructure
3.3 Particle Size Zoning across the Loess Plateau
3.4 Microstructural Characteristics under SEM
3.4.1 Sandy loess
3.4.2 Silty loess
3.4.3 Clayey loess
3.5 Summary
References

4 Physical and Mechanical Properties of Loess
4.1 Classification of Loess
4.2 Physical and Mechanical Properties
4.2.1 Dry density
4.2.2 Natural moisture content
4.2.3 Plasticity index
4.2.4 Liquidity index
4.2.5 Compressibility coefficient
4.2.6 Compressive modulus
4.2.7 Collapsibility coefficient
References

5 Loess Permeability
5.1 Dry Density
5.2 Buried Depth
5.3 Confining Pressure
5.4 Permeation Time
5.5 Freeze-thaw Cycle
5.6 Anisotropy
References

6 Shear Strength of Loess
6.1 Sedimentary Age
6.2 Moisture Content
6.3 Test Methods
6.4 Dry Density, Void Ratio and Compaction Degree
6.5 Shear Direction
6.5.1 Wucheng and Early Lishi loess
6.5.2 Later Lishi and Malan loess
References

7 Tensile Strength of Loess
7.1 Significance
7.2 Tensile Strength
7.2.1 Cohesion
7.2.2 Values of tension strength
7.3 Influencing Factors
7.3.1 Moisture content
7.3.2 Dry density
7.3.3 Specimen size
7.3.4 Tension speed
7.3.5 Consolidation pressure and compaction degree
7.3.6 Test methods
Reference

8 Loess Geohazards in China
8.1 Loess Geohazards in China
8.2 Shallow Loess Collapse
8.2.1 Controlling factors
8.2.2 Distribution law
8.2.3 Failure modes
8.3 Deep-seated Landslide
8.3.1 Controlling factors
8.3.2 Distribution law
8.3.3 Failure modes
References

Über Autor(innen)

Prof. Yanrong Li, PhD, works in the Department of Earth Sciences and Engineering at Taiyuan University of Technology, China. He is a funding Director of the Collaborative Innovation Center for Geohazard Process and Prevention at this university. He worked for ten years as a practicing engineer and field geologist in Hong Kong, Australia and China before he turned to be a full professor. The research of Prof. Li focuses on Quaternary Geology, Geoenvironment and Geohazards. He is a Chartered Geologist (CGeol) of the Geological Society of London and a Professional Member (MIMMM) of the Institute of Materials, Minerals and Mining. He served as an Associate Editor of KSCE – Journal of Civil Engineering and is now an Editorial Board Member of the Bulletin of Engineering Geology and the Environment. Professor Yanrong Li welcomes discussions on the contents of this book and diverse collaboration with experts of similar interests.

Dr. Jingui Zhao, has been in the Department of Earth Sciences and Engineering at Taiyuan University of Technology, China since September 2004. He obtained academic degrees of BSc (in Engineering Geology, 1998), MSc (in Mineral Resource Prospecting and Exploration, 2004) and PhD (in Tectonic Geomorphology, 2014) all from Taiyuan University of Technology. Dr. Zhao has great research interests in Structure Geology, Quaternary Geology and Geomorphology, and Geohazard. He has conducted research projects with outstanding outcomes, and published peer-review academic papers in these fields.

Dr. Bin Li, works in the Department of Earth Sciences and Engineering at Taiyuan University of Technology, China since 2016. He lived in the University of Bergen (UiB), Norway, for seven years, where he completed his MSc in Quaternary Geology and Paleoclimate in 2007, and PhD in Seismotectonics and Seismic Hazard in 2015. Prior to his PhD study in UiB, Dr. Li worked for three years as an engineer at the Earthquake Administration of Shanxi Province, CEA, China. His research focuses on Quaternary Geology, Earthquake Seismology, and Earthquake-induced Geohazard. He is involved in many research and has published a number of peer-review papers.