Geosyntec Consultants

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Geotechnical Infrastructure/Foundation Engineering

Geosyntec engineers have authored geotechncial engineering guidance documents for the Federal Highway Administration as resources for state DOTs.
Geosyntec engineers have authored geotechncial engineering guidance documents for the Federal Highway Administration as resources for state DOTs.

Our team saved the owners of one of Georgia's highest earthen dams more than $1 million in retrofit costs to meet dam safety requirements.
Our team saved the owners of one of Georgia's highest earthen dams more than $1 million in retrofit costs to meet dam safety requirements.

Geosyntec applies its geotechnical engineering expertise to develop stabilization and restoration strategies for areas impacted by slope failures and other catastrophic events.
Geosyntec applies its geotechnical engineering expertise to develop stabilization and restoration strategies for areas impacted by slope failures and other catastrophic events.

Geosyntec provides nationally recognized expertise and specialized geotechnical and geological engineering (geoengineering) services to evaluate and improve the design and construction engineering properties of soil and rock foundations. Our geoengineering specialists form one of the leading practices in the United States. They are recognized for their ability to develop practical guidance, and efficient designs conducive to aggressive construction schedules commonly imposed by project economics.

Practice Specialties

Our geoengineering practice focuses on difficult and challenging sites where the development of dependable, cost-effective foundations, and other geostructural solutions are critical to the success of the project. Our practitioners accomplish this by establishing a thorough understanding of the project site, developing a technical framework for the project, and incorporating the critical non-engineering drivers such as schedule and project economics into the early stages of our planning.

Our geoengineering 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; altering the engineering characteristics of the soil and rock at a specific site through soil and rock improvement; and environmentally remediating sites. We implement these approaches so foundations and other subsurface structures can be constructed safely, adequately support the built environment, and withstand potential geohazards. Our geotechnical practitioners are fully familiar and experienced with the practical application of these tools. For example, when a client needed to develop a critical structure near Wilmington Harbor in Delaware, the client turned to Geosyntec to geotechnically engineer a practical, cost-effective solution. Our team developed an innovative foundation design and construction methodology for very soft and compressible foundation materials that included wick drains, embankment preloading, and mechanically stabilized earth walls. Our design saved the client nearly $100 million when compared to more traditional approaches proposed by others.

Our geoengineering practitioners distinguish themselves by rapid development of an appropriate understanding of the geologic and environmental history of a site, and using this knowledge to screen potential ground improvement and foundation technologies (wick drains, deep soil mixing, deep dynamic compaction, vibro-replacement, and surcharging) to identify the more dependable and cost-effective approaches. These screening-level studies become a basis for gathering optimized geotechnical information based on carefully considered analyses tempered with practical, hands-on experience sufficient to not only characterize the site, but also design dependable foundations. These attributes have been particularly beneficial to our petroleum and chemical industry clients who are currently undertaking large-scale capital projects in undeveloped areas. For example, Geosyntec is working with oil and gas interests on foundation design, off-shore reclamation, and underwater slope stability issues related to the development of a LNG trans-shipment facility on the coast of southwestern Africa.

Advancing the State of the Practice

Our senior practitioners have authored technical design and construction manuals for the Federal Highway Administration focusing on foundation support systems, earth retaining systems, and earthquake engineering. Geosyntec provides lead, geotechnical training instructors for the National Highway Institute and the American Society of Civil Engineers (ASCE). We provide training to state departments of transportation, contractors, and consultants for state-of-the-practice design applications. Our staff members are active contributors and developers of the American Association of State Highway and Transportation Officials (AASHTO) Load and Resistance Factor Design (LRFD) Specifications for bridge substructures including foundations and retaining wall systems. Several of our practitioners have received ASCE’s highest awards for advancing the state-of-the-practice in geoengineering.

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Practices
Persons
Projects
Optimizing the Design Process for Dredged Material Containment Area Dike Raisings Adjacent to Savannah River Harbor
Seismic Evaluation and Rehabilitation of the Lake Petit Dam
Temporary Excavation Design for expansion of Memorial Hermann Heart and Vascular Institute
Geotechnical Engineering Design for Deep Soil Excavation Program
Port of Los Angeles Vacuum Consolidation Technology Demonstration
Feasibility Evaluation and Remedy Design for Slope Rehabilitation at the Warner Hill Landfill, Cuyahoga County, Ohio
Pier G Wharf Loading System Upgrade and Pile Driving CQA - Port of Long Beach
Geotechnical Design & Stormwater Management Consulting - Closed Landfill Conversion to Destination Park
Design/Build of Shoreline Sheet Pile Wall for Groundwater Flow Control
Geotechnical Design for Building Construction near Subway Tunnel and Other Subsurface Infrastructure
Innovative Foundation Improvement Technique Supports Massive MSE Wall Construction Initiative
Geotechnical Oversight and Engineering for Crude Oil Tank Farm (CTF) Expansion
Suspended Geomembrane Cutoff Wall
Technical Support for a Construction Claim Regarding Historic Fill
Construction Inspection Course for Mechanically Stabilized Walls and Reinforced Soil Slopes
Design and Construction of a Slurry Wall and Engineered Cap for Site Redevelopment
Design of Foundation and Structural Integrity Support System for Soil Removal Beneath an Operating Manufacturing Facility
Field Exploration and Laboratory Testing Program to Support Gabion Wall Stability Assessment
Geotechnical Exploration and Engineering Analyses Supporting Redevelopment Design and Construction Activities
Non-Urban Levee Evaluation Program
Levee Seepage Evaluation and Stability Assessment
Geotechnical Inspection and Monitoring Services for Dredged Material Disposal Area
H-Pile Foundation Installation Oversight and Load Testing
Airport Improvements Subsurface Investigation and Geotechnical Recommendations
Field-scale Verification of Engineering Properties for Sluiced Fly Ash
Dam Safety Reviews and Potential Failure Mode Analyses
Proposed Substation Geotechnical Investigation
Geotechnical Engineering Support for Wolf Creek Dam Deep Barrier Wall Construction
VA Medical Center Campus New Construction Geotechnical Investigation and Seismic Hazard Analysis
Geotechnical and Structural Engineering Support for Ethylene Plant Construction
Geotechnical and Seismic Engineering Services for Phased Commercial Development adjacent to San Francisco Bay
Geotechnical Engineering Support for New Gas-to-Liquids Plant
Twin Circuit 230-kV Underground Transmission Line Sunrise Powerlink Project
Earthquake, Structural, and Geotechnical Engineering Services for LNG Export Facility
Geotechnical Engineering Support for LNG Processing and Export Facility
Stabilization of Active Landslide
Herbert Hoover Dike Rehabilitation Reach 1 Seepage Cutoff Wall - Lake Okeechobee, Florida
Development and Implementation of Comprehensive Dredged Material Management Solutions for an LNG Facility - Savannah, Georgia
Geotechnical Investigation and Landslide Stabilization at Vandale Junkyard Superfund Site - Marietta, Ohio
Engineering and Construction Services for the Center Hill Dam Foundation Remediation - DeKalb County, Tennessee
Design and Permitting for Closure of a Fly Ash Reservoir High Hazard Dam Modification
Foundation Design for Rail Line Extension Atop Closed Coal Ash Pond
Coal Combustion Residuals Management Plans - Kingston Fossil Plant
Design and Permitting for Coal Combustion Residuals Requirements and Effluent Limitation Guidelines
Publications
Landslide stabilization using an MSE buttress at a U.S. Superfund remediation site
Geotechnical Analysis in Karst: The Interaction Between Engineers and Hydrogeologists
Use Of GIS Techniques To Assist In The Stability Assessment Of Dredged Materials Containment Dams
Development of a Standardized Geotechnical Database and Geographic Information System for the Woodrow Wilson Bridge
Stress Cracking Potential of HDPE Geogrids
Settlement Prediction of the Esperanza Dam
Strength loss and localization at silt interlayers in slopes of liquefied sand
Infiltration
Geosynthetics in Dam Rehabilitation
Design of Geomembrane Anchorage Against Wind Action
Stability of Geosynthetic-Soil Layered Systems on Slopes
Lessons Learned From Failures Associated with Geosynthetics
Design Guidance: Geotechnical Earthquake Engineering for Highways
Newmark Seismic Deformation Analysis for Geosynthetic Interfaces
Newmark Deformation Analysis with Degrading Yield Acceleration
Geotechnical Engineering Circular No. 4, Ground Anchors and Anchored Systems
Geotechnical Engineering Circular, No. 5, Evaluation of Soil and Rock Properties for Geotechnical Design and Construction
Analysis of Localized Deformation in an Internally Braced Excavation
Seismic Response of Rigid Block on Inclined Plane to Vertical and Horizontal Ground Motions Acting Simultaneously
General Report Session 3 - Case Histories in Geotechnical Earthquake Engineering and Natural Disasters
Slope Stability at a Hazardous Waste Site – Evaluation of the CPT Cone Factor Nk Using Dynamic Property Correlations
Nonlinear Incremental Thermal Stress Strain Analysis for Portugues Dam; An RCC Gravity Arch Dam
Design of Dredged Material Containment Area Dikes on Soft Foundations
Modeling Stability of Stacked Geotextile Tubes
Geotechnical Engineering Circular No. 2, Earth Retaining Systems
Geotechnical Engineering Circular No. 3, Geotechnical Earthquake Engineering for Highways, Volume I – Design Principles
Geotechnical Engineering Circular No. 3, Geotechnical Earthquake Engineering for Highways, Volume II – Design Examples
Use of Reliability Methods as a Project Management Tool: The Cherry Island Landfill Expansion Project
Nonlinear Time-Domain Analysis of a Sliding Block on a Plane
Application of Ground Improvement Technologies Toward Sustainable Engineering Practices
A Perspective on Mechanically Stabilized Earth Walls: Pushing the Limits or Pulling us Down?,
Design of Dredged Material Containment Area Dikes on Soft Foundations
Lessons Learned from the Partial Closure of a 'Spongy' Landfill
Research, Teaching, and Practice Interrelationships in Geo-Engineering Development: Is the Past a Prologue to the Future?"
Methodology for Determining Laboratory and In Situ Hydraulic Conductivity of Asphalt Permeable Friction Course
New Layer-Moduli Back-Calculation Method Based on the Constrained Extended Kalman Filter
Recommended Practice for Full Flow Penetrometer Testing in Soft Sediments
September 2009 American Samoa Tsunami
Design Considerations for a Vertical Landfill Expansion over Extremely Compressible Soils
Use of Reliability Methods as a Project Management Tool: The Cherry Island Landfill Expansion Project
Seismic Analysis of Heap Leach Pad Liner Systems
Geotechnical Considerations, Opportunities, and Strategies for Infiltration Stormwater BMPs
Required Unfactored Strength of Geosynthetic in Reinforced Earth Structures
Recent Advances in Seismic Design of Geosynthetically-Lined Waste Containment Facilities,
Development of a Portable Probe for Field and Laboratory Measurement of Low to Medium Values of Soil Suction
GIS for Geotechnical Decision Making: Visualization of Cut-Off Wall Construction Data
Load and Resistance Factor Design for Earth Retaining Structures in U.S. Transportation Practice
Evaluation of Creep Behavior of High Density Polyethylene and Polyethylene-Terephthalate Geogrids
Modeling Stability of Stacked Geotextile Tubes
Soil Deformation and Excess Pore Pressure Field around a Closed-Ended Pile
Effect of Pile Installation on Static and Dynamic Properties of Soft Clay
Effect of Pile Installation on the Shear Wave Velocity of a Soft Clay Deposit
Effect of Storage Capacity in the Performance of Vertical Drains in Liquefiable Sand Deposits
Use of Prefabricated Drains for the Reduction of Liquefaction Potential
FEQDrain. A Finite Element Computer Program for the Analysis of the Earthquake Generation and Dissipation of Pore Water Pressure in Layered Sand Deposits with Vertical Drains
Stress and Deformation Analysis of La Esperanza Dam using Geofeap and Conswell
Site Response Analysis in Transportation Engineering Practice -- A TRB Survey
Use of Exact Solutions of Wave Propagation Problems to Guide Implementation of Nonlinear Ground Response Analysis Procedures
CPT-Based Seismic Stability Assessment of a Hazardous Waste Site
Evaluating the Seismic Response of Deep Sandy Soil Deposits
Seismic Design of Mixed and Hazardous Waste Landfills
Ground Motion Characterization
Nonlinear Site Response: Where We're At
Newmark Seismic Deformation Analysis for Geosynthetic Covers
Performance of Solid Waste Landfills in Earthquakes
Observations of the Performance of Solid Waste Landfills During Earthquakes
Seismic Response of Soil Deposits Composed of Fully Saturated Clay and Sand
Generalized Cyclic Degradation-Pore Pressure Generation Model for Clays
RCRA Subtitle D (258) Seismic Design Guidance for Municipal Solid Waste Landfill Facilities
Cyclic Characterization of Liquefiable Sands