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Rock Fall EngineeringBy Duncan C. Wyllie
M00001551
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Rock falls can be a public safety issue. This book provides comprehensive information on identification of these hazards, and design and construction of protection methods.
Rock Fall Engineering
describes first, the theoretical background to rock fall behavior in terms of the impact and trajectory phases of rock falls, and second, how this information is applied to modeling of rock falls and the design of ditches, fences and sheds. The theory of rock fall behavior is verified by comparing the calculations with five carefully documented case studies.The book covers four main topics as follows:
Describes causes of rock falls, including geology, climate and topography, and provides detailed documentation on rock fall impacts and trajectories at five sites with a wide variety of topographic and geologic features Discusses theory of impact mechanics, and its application to velocity and energy changes during impacts and trajectories Reviews methods of modeling rock fall events, and presents analyses for the five case studies Examines rock fall protection in terms of selecting appropriate method(s) for site conditions, and design principles in which the objective is to absorb impact energy in an efficient manner
This book, which contains many worked examples, is of interest to practitioners and researchers working in the fields of geological engineering and natural hazards.
Duncan C. Wyllie
is a principal with Wyllie & Norrish Rock Engineers in Vancouver, Canada, and a registered professional engineer in British Columbia. He has worked on rock fall hazard projects involving the design and construction protection measures since the 1970s. He is the author of Foundations on Rock, Second Edition, and Rock Slope Engineering, Fourth Edition, both published by CRC Press.Table of Contents
Rock Falls – Causes And Consequences
Source Zones And Topography
Geology
Weather Effects On Rock Falls
Vegetation Effects On Rock Falls
Seismic Effects On Rock Falls
Human And Animal Influences On Rock Falls
Consequences Of Rock Falls
Documentation Of Rock Fall Events
Impacts On Rock Slopes
Impacts On Talus And Colluvium Slopes
Impacts On Asphalt
Impact With Concrete
Summary Of Case Study Results
Rock Fall Velocities And Trajectories
Trajectory Calculations
Rock Fall Velocities
Variation Of Trajectories With Restitution Angle
Angular Velocity
Field Observations Of Rock Fall Trajectories
Impact Mechanics
Principles Of Rigid Body Impact
Forces And Impulses Generated During Collinear Impact
Energy Changes During Impact
Coefficient Of Restitution
Friction And Angular Velocity Changes During Impact
Impact Behaviour For Rough, Rotating Body
Calculated Vs Actual Restitution Velocities
Coefficient Of Restitution
Newton’s Coefficient Of Restitution
Normal Coefficient Of Restitution
Tangential Coefficient Of Restitution And Friction
Energy Changes During Impacts And Trajectories
Impact Mechanics Theory And Kinetic Energy Changes
Rotational Energy Gains/Losses
Total Energy Losses
Energy Loss Diagrams
Loss Of Mass During Impact
Effect Of Trees On Energy Losses
Rock Fall Modelling
Spreadsheet Calculations
Terrain Model – Two Dimensional V Three Dimensional Analysis
Modelling Methods – Lumped Mass
Modelling Methods – Discrete Element Model (DEM)
Modelling Results Of Case Studies
Summary Of Rock Fall Simulation Results
Selection Of Protection Structures
Impact Energy – Deterministic And Probabilistic Design Values
Impact Energy – Service And Ultimate States Energies
Impact Energy – Probability Calculations
Determination Of Rock Fall Return Periods
Risk Management Of Rock Fall Hazards
Design Principles Of Rock Fall Protection Structures
Structure Location With Respect To Impact Points
Attenuation Of Rock Fall Energy In Protection Structures
Minimizing Forces In Rock Fall Protection Fences
Design Of Stiff, Attenuator Fences
Model Testing Of Protection Structures
Rock Fall Protection I – Barriers, Nets And Fences
Ditches And Barriers
MSE Embankments
Slide Detector Fences
Wire Mesh – Draped and Pinned
Nets and fences
Rock Fall Protection II - Rock Sheds
Types of rock sheds
Reinforced concrete sheds
Cantilevered structures
Sheds with sloping roofs
Wire mesh canopies
Appendices
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Author(s)
Biography
Duncan C. Wyllie has a physics degree from the University of London and engineering degrees from the University the New South Wales, Australia and the University of California, Berkeley. He is a principal with Wyllie & Norrish Rock Engineers in Vancouver, Canada, and a registered professional engineer in British Columbia. Duncan Wyllie has lectured widely and has also authored or co-authored a number of textbooks on applied rock mechanics including Foundations on Rock (1st and 2nd editions in 1989 and 2001), and Rock Slope Engineering, Fourth Edition (2002), both published by Taylor & Francis.
Reviews
"This book provides an invaluable perspective to engineers and geologists dealing with rock slope failures: not so much what causes the failures in the first instance, but what happens to the rock masses as they move, and therefore how to analyse them. I don’t think that there is a good, systematic, treatment elsewhere."
––Eddie Bromhead, retired from Kingston University, London, UK
"… a comprehensive book containing both the theory and practice of rock fall engineering. The author is experienced not only in these subjects but also in compiling books that present the material in a particularly easy-to-understand manner—which will be appreciated by all readers whether they be engineers, contractors, clients, researchers, teachers or students. In short, this book contains the necessary information to understand and design rock fall protection."
—Emeritus Professor John A. Hudson, Imperial College London