During this webinar, we present case histories and discuss topics relevant to the current state-of-practice and recent advancements in the earth retaining structures industry. Through case histories and project examples, participants will learn about recent advancements in underpinning methods and innovations, including deep excavations in recent projects on Washington, DC, other U.S. Cities, and Mexico City. The session content it is focuses on earth retaining structures. The webinar will consist of a 2 hour session with four 20 to 25 minute presentations.
In this session, we present case histories and discuss topics relevant to the current state-of-practice and recent advancements in the earth retaining structures industry. Through case histories and project examples, participants will learn about recent advancements in underpinning methods and innovations, including deep excavations in recent projects on Washington, DC, other U.S. Cities, and Mexico City. The session content it is focuses on earth retaining structures. The webinar will consist of a 2 hour session with four 20 to 25 minute presentations.
Though case histories and project examples, participants will learn about recent advancements in retaining structure construction, including advanced instrumentation and monitoring techniques and construction methods to minimize the impacts of construction on existing structures and the surrounding environment.
The session content will focus on recent and innovative aspects of earth retaining structures and should interest structural engineers, geotechnical engineers, civil engineers, construction professionals and geologists.
Site investigation and characterization, analysis and design of deep foundations, sheet piles, retaining structures for bridge abutments and deep excavation, and deep foundations in rock and liquefiable soils. Approaches include allowable working stress, load and resistance factor design, and the use of modern numerical modeling tools.
Analysis of free and forced vibrations, and transient response of structures having many degrees of freedom; elastoplastic behavior considered for structural systems; earthquake design and response of structures.
1. The provisions of this Part 5 apply to retaining structures in general. These are structures used to retain ground comprising soil, rock or backfill and water and this at an angle steeper than the angle they would normally adopt without the presence of those structures. Common retaining structures used within the state of Qatar taking into account the prevailing geologic conditions are:
2. Foundation failure of retaining structures with footings: it should be demonstrated that the foundation pressures (lateral and vertical) do not exceed neither the ground allowable bearing capacity nor the sliding resistance. Uplift pressures under the foundation due to water seepage should also be included in the analysis.
1. Unacceptable movement of the retaining structure, which may affect the appearance or functionality of the structure itself, or other neighbouring structures or utilities influenced by the movement.
1. This paragraph covers the uncertainties in the geometrical data namely excavation and water levels. In general, small variations in geometrical data are considered to be covered by the safety factors included in the calculations. However, since the design of retaining structures is sensitive to ground and water levels, special requirements are included in this paragraph, mainly for unforeseen over-dig in front of the wall and groundwater levels change on both sides of the wall.
2. For retaining structures without strict serviceability requirements, the geometry is usually determined by Ultimate Limit State design calculations and checked by Service Limit State calculations (if relevant). For the retaining structures with strict serviceability requirements, the Service Limit State requirements often govern the design.
6. In the case of structures retaining rock masses, calculations of the ground pressures shall take into account the effects of discontinuities, with particular attention to their orientation, spacing, aperture, roughness and the mechanical characteristics of any joint filling material.
3. For structures retaining earth of medium or low permeability (silts and clays), water pressures should normally be assumed to act behind the wall. Unless a reliable drainage system is installed, or infiltration is prevented, the values of water pressures should normally correspond to a water table at the surface of the retained material. 4 Where sudden changes in a free water level may occur, both the non-steady condition occurring immediately after the change and the steady condition shall be examined. 5 Where no special drainage or flow prevention measures are taken, the possible effects of water-filled tension or shrinkage cracks shall be considered.
1. The design of retaining structures shall be checked at the ultimate limit state for the design situations appropriate to that state, as specified in 5.3.3, using the design actions or action effects and design resistances.
1. The design of retaining structures shall be checked at the serviceability limit state using the appropriate design situations as specified in 5.3.3. The assessment of design values of earth pressures should take account of the initial stress, stiffness and strength of the ground and the stiffness of the structural elements. 2 The design values of earth pressures should be derived taking account of the allowable deformation of the structure at its serviceability limit state. These pressures need not necessarily be limiting values.
Dr. Omidvar is an Associate Professor of Civil and Environmental Engineering at Manhattan College. His research interests include infrastructure risk assessment, numerical and analytical modeling with applications in soil-structure interaction, seismic analysis, high strain rate and extreme loading of soils, earth retaining structures, and support of excavation systems.
Dr. Omidvar has several years of experience in design of earth dams, deep foundations, and earth retaining structures. In addition, he has conducted research as principal investigator and co-investigator on close to $2M in externally-funded projects. He has received funding from the Department of Defense (through SERDP), the Department of Transportation (through UTRC), and the United States Universities Council on Geotechnical Education and Research (USUCGER).
You can also filter our people, our projects, and our publications to find what you need. #sp-banner background:#6d6e71 url( -practice-geotechnical-earth-retaining.jpg) no-repeat center center; background-size: cover !important; Earth Retaining Structures and Excavation Support « Practices « Geotechnical and Geological Analysis, Modeling, and Engineering
Since its founding in 1983, Geosyntec has provided high-value solutions to industrial and public sector clients in projects that include geotechnical and geo-structural aspects. Our professionals have developed capabilities and experience in the analysis, design, and constructability assessment of retaining structures, deep and shallow foundations, ground improvement, geotechnical instrumentation, construction over soft ground, and other aspects of geotechnical engineering.
Our geotechnical professionals have responded to the challenges of increasingly unfavorable site conditions by developing and applying sophisticated approaches to investigate and characterize sites; analyzing foundation behavior; improving engineering characteristics of soils at a specific site through soil modification; and combining these solutions while remediating those sites that require environment cleanup and remediation. We implement these approaches so foundations and other subsurface structures can be constructed safely, adequately support the built environment, and withstand potential geohazards. In some projects, our designs were part of sustainability or LEED certification efforts.
Our senior practitioners have authored technical design and construction manual for the Federal Highway Administration (FHWA) focusing on foundation support systems, earth retaining systems, and earthquake engineering. Our engineers have authored or co-authored most of the FHWA series titled Geotechnical Engineering Circulars (GECs). These include GECs on Earth Retaining Systems, Earthquake Engineering for Highways, Ground Anchors and Anchored Systems, Evaluation of Soil and Rock Properties, Soil Nail Walls, Design and Construction of Continuous Flight Auger Piles.
A leading-edge, nationwide contractor, Schnabel is an innovative specialty foundations company that provides design-build earth-retention solutions. Our impressive product range includes soil nailing and soldier piles and lagging, secant piles, sheet piles, deep soil mixed walls, cutoff walls, underpinning, jet grouting, landslide stabilization, tiedowns, tiebacks, bracing, deep soil mixing, and micropile foundations. If you need custom earth retention solutions, we have the tools and experience to meet your highest demands.
38c6e68cf9