Slope Stability and Landslides

Day 1 — Soil Stability Analysis Interpretation, and implementation

Introduction, Expectations, and Objectives

• The 4 G’s of Slope Stability
• • Geology
  • Geometry
  • Geotechnical
  • HydroGeology
• Slope Failures, Movements, and Processes
  • Features and Geometry of Instability
  • Failure Processes
  • Type and Rate of Movements

Fundamentals of Soil Strength

• Strength 101
• • Mohr-Coulomb Failure Criterion
  • Effective Stress versus Total Stress
  • State of Stress and Stress Change
• Laboratory Measurement of Strength
  • Simple Shear Tests
  • Triaxial Testing
  • Direct Shear
• Typical Soil Properties
• Selection of Design Shear Strengths
• In Situ Measurement of Shear Strength

Slope Stability Investigation and Reporting

• Scoping the field investigation
• Understanding soil and rock bore logs
• Interpreting soils reports

Earth Pressures and Stresses

• Total and effective stresses
• Distribution of loads to underlying deposits
• Effects of water table fluctuations
• Dynamic effects on soil

Importance of Water in Slope Stability Analysis—Groundwater Levels, Seepage Pressures, and Pore Pressures

• Groundwater Effects on Slope Stability
• Measuring or estimating soil permeability
• Seepage forces and buoyancy effects
• Porewater Pressure
• The Porewater Pressure Parameter

Group Project/Case Study

DAY 2 — APPLIED SLOPE STABILITY ANALYSIS AND REMEDIATION

Geological Aspects of Slope Stability

• Jahnsian Steps to Landslide Investigations
  • Recognize
  • Characterize
  • Analyze
  • Stabilize

Fundamentals of Soil Slope Stability Concepts and Analysis with Examples

• Mechanics of Limit Equilibrium
• Slope Stability Analysis Methods
• Selection of the Analysis Method
• Reinforced slopes
• Deformation Analysis
• Finite Element Method (FEM)
• Example Slope Stability Programs
• Program Demonstration 

Comprehensive Slope Stability Analysis/Design Reporting

• Regional and Project Geology
• Hydrology
• Seismology
• Site Description and Work Proposed
• Project Subsurface Exploration
• Stability Analyses
  • Method
  • Groundwater Levels and Seepage Conditions
  • Tabulation and Material Property Values for each Load Condition
  • Verification of Results
• Recommendations and Results

Rock Slope Investigation and Rock Mechanics for Slopes

• Research and Field Preparation
• Rock slope investigation
  • Rock type, discontinuity orientation, geometry, water conditions
  • ID rock structures and possible failure modes
  • Methods to estimate shear strength of discontinuities
• Mapping
• Rock Mechanics for Slopes
  • Important engineering properties of rock for slopes

DAY 3 — SLOPE REMEDIATION AND EVOLVING PRACTICE

Slope Stabilization Methods

• Soil Compaction and Improvement
• Buttressing
• Drainage
• Structural systems

Remediation of Rock Slopes

• Rock slope remediation techniques
  • Rock removal (scaling)
  • Rock reinforcement
  • Protection measures

Rock Slope Case Studies

• Quarry slope case study
• Rock toppling case study

Advancing Topics in Slope Stability and Landslides

• Stability of landfill systems
• Asset management
• Risk assessment
• Remote sensing and instrumentation
• Rock falls
• Debris flows
• Emerging climate risks

• William Likos

  Professor & Chair Geological Engineering

  William Likos, PE, is the Gary Wendt Professor and Chair of Civil and Environmental Engineering at the University of Wisconsin-Madison. Dr. Likos’ expertise is in the area of geotechnical engineering, with particular emphasis on unsaturated soil mechanics and expansive clay behavior. Unsaturated soil mechanics is widely considered one of the most important frontiers in geotechnical engineering, with historical applications in slope and excavation stability, foundation engineering, and expansive soil hazards and emerging applications in waste containment, energy, and sustainability. Dr. Likos has established himself as a national leader in this area by publishing one of the first textbooks dedicated to the subject, publishing extensively in the top refereed journals, and serving in leadership roles on national committees. 

• James Tinjum

  Associate Professor

  James M. Tinjum, PE, PhD, F.ASCE, is an Associate Professor and outgoing Director of the Geological Engineering Program at the University of Wisconsin–Madison. Dr. Tinjum has 35 years of solid waste experience, beginning in 1990. Prior to his engagement as a faculty member at UW–Madison in 2008, he worked for 15 years in industry for prominent engineer-procure-construct firms and a Fortune 50 company. He has specialized technical knowledge in geoenvironmental and remediation engineering for landfills with industrial waste (lime kiln dust, cement kiln dust, foundry residuals, paper mill sludge, coal combustion residuals), municipal solid waste (particularly landfill liner and cover systems and the monitoring, recovery, and value-added use of landfill gases), and hazardous waste. He conducts research in waste geotechnics and waste containment systems; the beneficial reuse of industrial byproducts (e.g., for subgrade improvement and cementitious stabilization of pavement layers); life cycle environmental analysis of geo systems; remediation of contaminated sites; and fate and transport of landfill gas emissions. Dr. Tinjum developed these interests not only through industry practice and applied research, but also through discussions and interactions with practitioners participating in his nationally/internationally attended engineering short course programs. In applied practice, Dr. Tinjum has participated in nearly 100 solid waste projects. 

• Dale Marcum

  Principal Geologic Engineer, retired

  Dale Marcum, PE, is a Principle Geologic Engineer, Cotton, Shires and Associates, Inc., Los Gatos, California. Dale has a background in both geology and engineering.  He managed to earn a bachelor’s degree in geology at Western State College of Colorado, despite the local skiing and fishing opportunities.  Following graduation, he spent three years working as a geotechnical consultant in the San Francisco Bay Area.  This was soon after the 198282 El Nino storms that caused extensive slope stability problems in Northern California, so many of the projects Mr. Marcum worked on during this time period involved investigating and repairing landslides.  Wanting to learn more about the engineering aspects of landslide remediation, Mr. Marcum returned to academia, and earned a master’s degree in geotechnical engineering at U.C. Berkeley.  At Berkeley, due to his background in geology and studying rocks, Mr. Marcum focused his interests on rock mechanics. 

• Program Director

  James Tinjum

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