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Retaining Wall and Slope Design Considerations

Earth retaining structures are engineered to retain a soil and/or rock mass adjacent to an area, building or structure, and are commonly used to accommodate changes in grade and provide a right-of-way. There are several types of retaining structures ranging from gravity retaining walls that rely on their weight to resist lateral pressures to anchored/tieback walls that rely on ground anchors for stability. Mechanically stabilized earth (MSE) walls have gained wide acceptance in highway, commercial and residential construction because of their relatively low cost, efficiency in construction, flexibility in civil design, and aesthetic appeal. These walls are gravity-type retaining walls that rely on a metal- or geosynthetic-reinforced earth mass for stability. The Federal Highway Administration estimates that more than half of all retaining walls constructed every year for transportation applications in the United States are MSE walls with precast facing, and designers of MSE walls continue to push the design envelope in terms of wall height, length of the reinforced zone, and quality of backfill soils. The popularity of this wall system has generated several management and review challenges for owners and approving agencies, as an increasing number of MSE wall systems are being marketed by specialized consultants and/or contractors instead of being designed by a project designer/structural engineer as is typically the case.

Learning Objectives:

  • You will be able to review planning aspects related to the selection of earth-retaining structure types.
  • You will be able to discuss design and construction considerations related to loads acting on earth-retaining structures, including water and seismic loads, and generally accepted good construction practices.
  • You will be able to review performance assessment and failures of earth retaining structures, including their performance during earthquakes.
  • You will be able to discuss MSE walls.

Runtime: 102 minutes
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Agenda

Overview

Objectives

Types of Retaining Walls and Design Concepts

  • Gravity
  • Reinforced Earth
  • Cantilever
  • Sheet Piling
  • Anchor and Tieback
  • Retaining Wall Selection Process

Earth-Reinforced Walls

  • Advantages and Disadvantages
  • Reinforced Earth Concepts and Properties
  • Reinforcement Options and Properties

Loads Acting on Earth-Retaining Structures

  • Lateral Earth Pressures
  • Structural Loads From Adjacent Footings
  • Water Pressures
  • Surcharge and Traffic Loads
  • Seismic Loads
  • Other Loads

Design and Construction Considerations

  • Allowable Stress Design (ASD) vs. Load and Resistance Factor Design (LRFD)
  • Stability and Settlement
  • Site/Foundation Preparation
  • Backfill Selection and Compaction
  • Wall Components and Details
  • Drainage

Earth Retaining Structures: Performance and Failures

  • Typical Performance Expectations and Failure Modes
  • Common Causes of Distress or Failure
  • Performance During Earthquakes
  • Failure and Distress Investigations
  • Monitoring
  • Repair Alternatives

Discussion

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Over 31 years and 1.4 million customers worth of experience providing continuing education. Our passion is providing you world-class training to help you succeed in business and as a professional.

Credits

OnDemand Webinar

This program does NOT qualify, nor meet the National Standard for NASBA accreditation.

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Why Lorman?

Over 31 years and 1.4 million customers worth of experience providing continuing education. Our passion is providing you world-class training to help you succeed in business and as a professional.

Faculty

Juan F. Perri, Ph.D., P.E.

Juan F. Perri, Ph.D., P.E.

Exponent

  • Managing engineer at Exponent Failure Analysis Associates’ Oakland, California office
  • Practice includes soil mechanics, geotechnical engineering, foundation engineering and earthquake engineering, including foundations and earth retaining structures, dams, levees and basins, landslides and slope stability, and site characterization
  • Writer of several publications related to monitoring and repairs of slope failures, seepage, erosion and stability evaluations of levees, selection and characterization of seismic ground motions, piled foundations and soft soils
  • Ph.D. degree in ocean engineering, civil and environmental engineering, University of California, Berkeley; M.S. degree in civil and environmental engineering, University of California, Berkeley; M.S. degree in ocean engineering, University of California, Berkeley; M.S. degree in civil engineering, Politecnico di Torino, Italy; B.S. degree in civil Engineering, Politecnico di Torino, Italy
  • Can be contacted at [email protected]
K. Medji Sama, Ph.D., P.E.

K. Medji Sama, Ph.D., P.E.

Exponent, Inc.

  • Managing engineer at Exponent Failure Analysis Associates’ Los Angeles, California office
  • Areas of expertise include: geotechnical engineering, foundation engineering, geotechnical earthquake engineering, retaining walls evaluation and failure investigations, landslides investigation and mitigation, geotechnical aspects of buried pipes design and performance
  • Project experience includes design peer review, failure analysis, design of mitigation measures following failures, evaluation of insurance and construction (e.g. differing site conditions) claims, etc.
  • Conducted seminars and workshops on soils and foundations, landslides, post-earthquake damage assessment, etc.
  • Writer of several publications on fundamental soil behavior
  • American Society of Civil Engineers, Member
  • Ph.D. degree in geomechanics, Stanford University; M.S. degree in geomechanics, Stanford University; B.S. degree in civil engineering, University of the District of Columbia
  • Can be contacted at [email protected]
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Product ID: 390403
Published 2013
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