WENJUN DONG, Ph.D, P.E. - Chief Geotechnical Engineer

Major Assignments (back)
Geotechnical EngineeringCoastal EngineeringSubsurface FlowNumerical Modelling

Geotechnical Engineering (top)
  • Soil Parameters for Design and Analysis

    Determined the shear strength of Holocene clay based on SHANSEP prodedure using field CPT, VST and laboraroty triaxial tests. (Hong Kong-Zhuhai-Macau Bridge Link, Zhuhai, P.R. China, 2011.)

    Participated into the preparation of geotechnical investigation and consequent laboratory testing of rock cores and soil samples. (Emergency Water Supply Line Replacement Alternative - Tunnel and Pump/Pipeline, Sonoma, California, 2010)

    Derived the input parameters of soft soil to the advanced soil models that are used in the soil-structure-interaction analysis of the Floodwall, based on critical state soil mechanics. (IHNC Storm Surge Barrier, New Orleans, LA, 2009.)

    Validated the design parameters of bedrocks using Rock Mass Rating system and Hoek-Brown rock failure criterion. (Doha Metro Tender Design, Doha, Qatar, 2012.)

    Deterimined the design input parameters of intact rock and rock mass of three basic rock formations (Gatun, La Boca and Basalt) to seismic SSI analysis of Lock Wall and Lock Gate, based on Hoek-Brown rock failure criterion. (Post Panamax 3rd Lane Lock Tender Design, Panama, 2008.)

  • Retention Structures

    Assisted the concept development of the braced bulkhead for the construction of the MSEW. Participating the design and analysis of the templates for cellular bulkhead and dolphin piles. (Trans Mountain Expansion Project, Burnaby, BC, Canada, 2017.)

    Performed the design and analysis of anchored combi-wall of berthing pier. (Thimble Shoal Tunnel Project, Virginia Beach, VA, 2016.)

    Estimated the lateral capacity of anchor piles of bulkhead with consideration of interaction between anchor piles and bulkhead sheet piles. (Goethals Bridge Replacement, New York, NY, 2015.)

    Assisted the design and stability assessment of containment wall with/without jet grouting pressures during the construction. (Elliott Bay Seawall Project, Seattle, WA, 2014.)

    Performed the feasility study of excavation approaches of rock construction trench for metro lines. (Doha Metro Tender Design, Doha, Qatar, 2012.)

    Conducted the design of batter pile braced floodwall and cofferdam for pump stations using limit equilibrium procedure, and global stability assessment of the Floodwall under the unbalanced loads. (Permanent Canal Closure and Pumping Bid Design, New Orleans, LA, 2011.)

    Determined the hurricane induced unbalanced lateral loads on IHNC Floodwall using HSDRRS design guide procedure and finite element modelling. (IHNC Storm Surge Barrier, New Orleans, LA, 2009.)

    Determined the seismic earth pressures on Lock Wall and Lock Head based on the Mononobe-Okabe analytical formula and finite element dynamic modelling. (Post Panamax 3rd Lane Lock Tender Design, Panama, 2008.)

  • Deep Foundations

    Conducted the vibratory driveability studies of large drilled shaft steel casings at foundation piers 1 & 2 (12 feet in diameter) and approaching bents (8 feet in diameter) into dense granular soils. (White River Bridge, De Valls Bluff, AR, 2016.)

    Developed the Settlement Reducing Pile (SRP) design procedure for immersed tunnel, along with the verification of pile capacity with pile load testing. (Hong Kong-Zhuhai-Macau Bridge Link, Zhuhai, P.R. China, 2011.)

    Estimated the pile capacities for pump stations and floodwall following USACE Engineering Manuals and HSDRRS Design Guidelines. (Permanent Canal Closure and Pumping Bid Design, New Orleans, LA, 2011.)

    Determined the resistance characteristics of soft soils to laterally loaded large-diameter pile based on Lateral Pile Load Tests and Pressuremeter Tests; Estimated the axial and lateral capacities of closely spaced piles of the Floodwall and sector gate following the USACE Engineering Manuals and HSDRRS design guidelines; Investigated the lateral resistance characteristics of pile group foundation (including approximately 500 piles) of the GIWW sector gate. (IHNC Storm Surge Barrier, New Orleans, LA, 2009.)

    Assisted the design of cofferdam drill shaft foundations and evalated their axial and lateral capacities in the geological formations containing clay seams. (Chickamauga Lock Landward Cofferdam, TN, 2007.)

  • Soil/Rock Slope Stability

    Investigated the stability improvement measures of submerged rock dike berm of MRGO Closure on soft soil. (IHNC Storm Surge Barrier, New Orleans, LA, 2010.)

    Investigated the stabilizing measures of rock excavation using rock reinforcement (rock bolts) and shotcrete. (Post Panamax 3rd Lane Lock Tender Design, Panama, 2008.)

  • Seepage Analysis

    Estimated the dewatering pumping rates during construction excavation with considering potential groundwater buildup in the landward of improved soil mass. Evaluated the seepage piping cutoff during the construction of foundation slab. (Elliott Bay Seawall Project, Seattle, WA, 2014.)

    Performed finite element seepage analysis to investigate the gap formation, seepage cut-off depth and porewater pressures on the Floodwall. (IHNC Storm Surge Barrier, New Orleans, LA, 2010.)

  • Geotechnical Earthquake Engineering

    Developed the design response spectra and ground motion time series for the design and analysis of tower and anchor blocks; Investigated the influence of soil-rock boundary condition on site response behaviors; Verified the multiple support effects on ground motion series at foundation sites, with respect of baseline correction, wave passage and attenuation effects as well as fling effect; Assessed the liquefaction potential of foundation based on in-situ CPT soundings; Investigated the seismic kinematic effects on foundation piles using pseudo-static Winkler analysis procedure. (Izmit Bay Bridge Project, Izmit, Turkey, 2012.)

    Developed the seismic design criteria at tow levels for bid design based on the published study of seismic hazards near the construction site. (Doha Metro Tender Design, Doha, Qatar, 2012.)

    Performed seismic response analysis to develop earthquake ground motions for tunnel foundation design and analysis. Evaluated the seismic induced settlement of soft Holocene clay foundation of immersed tunnel. (Hong Kong-Zhuhai-Macau Bridge Link, Zhuhai, P.R. China, 2011.)

    Conducted Deterministic Seismic Hazard Analysis (DSHA) using Next Generation Attenuation (NGA) relationships to develop the design response spectra for the considered earthquake levels; Developed the spectra matched (in time domain with wavelet transform) ground motion inputs for dynamic finite element soil-structure-interaction analysis of the tunnel. (Emergency Water Supply Line Replacement Alternative - Tunnel and Pump/Pipeline, Sonoma, California, 2010)

    Performed site response analysis to develop ground motion inputs for dynamic finite element SSI analyses of lock wall, lock head and approach wall structures. (Post Panamax 3rd Lane Lock Tender Design, Panama, 2008.)

  • Soil-Structural-Interaction

    Performed the finite element soil-structure/pile-interaction analysis for the performance-based design of the IHNC Floodwall. (IHNC Storm Surge Barrier, New Orleans, LA, 2010.)

    Performed the dynamic finite element soil-structure-interaction analysis of lock wall, lock head and approach wall using the design seismic ground motions. (Post Panamax 3rd Lane Lock Tender Design, Panama, 2008.)

    Performed the finite element soil-structure-interaction analysis of monolith cofferdams to investigate the influence of integrated lock wall on drill shaft foundations during the construction and (equivalent) rock foundation reaction characteristics (springs) to the lock wall. (Chickamauga Lock Landward Cofferdam, TN, 2007.)

  • Reliability-Based Design
    With his background in applied mathematics, Dr. Dong shows interests on use of probabilistic and risk assessment methodologies in geotechnical engineering for the more reliable designs of geo-structures. He has done some foundamental works on reliability index and design points of the geotechnical reliability based design, reflected in his recent technical papers:

    An Analytical Approach of Geotechnical Reliability-Based Design (2017).

    Reliability Indices of Equivalent Geotechnical Performance Functions (2016).

Coastal Engineering (top)
  • Wave Loads on Marine Structures

    Determined the wave loads on bulkhead and piles of berthing pier using Goda formula; Estimated the barge impact load on mooring dolphins. (Thimble Shoal Tunnel Project, Virginia Beach, VA, 2016.)

    Determined the rip rap stone size for west bank armored slope based on CEM (Coastal Engineering Manual); Estimated the wave heights for the rip rap design based on SPM (Shore Protection Manual). (Goethals Bridge Replacement, New York, NY, 2015.)

    Determined the wave loads on the Floodwall based on Coastasl Engineering Manual; Verifying the design height of the Floodwall using criteria of water wave overtopping and volume; Determined stone size of scour protection rock layer behind the Floodwall. (IHNC Storm Surge Barrier, New Orleans, LA, 2010.)

  • Ice Loads on Marine Structures

    A comprehensive probabilistic study on magnitudes of ice loads on the moored vessels and their return periods of occurrences. (Tesoro Nikiski Dock Mooring Assessment, Nikiski, AL, 2007.)

    Investigated the stability (in terms of overturning and sliding) and structural integrity (in term of bending and shear stress) of the temporary west pier (pre-stressed, reinforced concrete) foundations under the considered ice loads during the construction. (New Champlain Bridge Corridor Project, Montreal, QC, 2017.)

  • Nearshore Sediment Transports
    The relavent topics that Dr. Dong worked on during his time at Tianjin University include:
    Sediment transports and riverbed deformation in Yongdingxinhe River under the tidal influence.
    Three-dimensional tidal motions and sediment transports in the North Bohai Bay.
    Three-dimensional modelling of tidal motions in the Lianzhou Bay.
    Inverse analysis of open channel flows for parameter identification of manning roughness.
Subsurface Flow (top)
The relavent topics that Dr. Dong worked on during his time at McGill University include:
  • Contaminant Transport in Porous Media
    Advective transport in a non-homogeneous porous medium.
    Subsurface transport problems associated with Hydro-Chemo-Mechanical multi-physical processes.
    Experimental modelling of the chemical transport in the porous medium using image processing technique.
    Parameter identification of chemical transport in porous medium through inverse analysis.
    Computational modeling of transport problem in poroelastic porous media with dual porosities.
    Theoretical study of chemo-mechanical damage of porous materials.
    Evaluation of stabilized finite element/difference methods for the hyperbolic equation using Fourier analysis.
    Aaccurate stabilized numerical schemes of advection-dominated reactive transports in porous media.
    Time and/or mesh-adaptive numerical schemes for advective transport problems.
  • Groundwater Flow in Unbounded Domain
    A combined finite and infinite element approach for modeling spherically symmetric transient subsurface flow.
    Finite-infinite element modelling of horizonal well flow problems.
Numerical Modelling (top)
The relavent topics that Dr. Dong worked on during his academic and engineering time include:
  • Finite Element Modeling of Transport Problems
    Finite-infinite element modeling of groundwater flow and transport problems in unbounded domains (2009, 2016).
    An accurate numerical modeling of the spherically symmetric advective-dispersive transport problem (2008).
    The numerical modeling for advective transport in the presence of fluid pressure transients (2006).
    A time adaptive scheme for the accurate solution of the advection equation with a transient flow velocity (2006).
    A combined numerical simulation of 3D tidal motion and sediment transport in tidal current and its application (2000).
    A fractional steps model of 3D tidal motion and sediment transport in estuary and nearshore (1999).
    Application of an upwind finite element method in 3D numerical simulation of tidal motion (1998).
  • Soil-Structure-Interaction for Geo-Structures
    Finite Element Modeling of a Pile Lateral Load Test (2017).
    Finite Element Seepage Analysis of the Floodwall in South Louisiana (2016).
    Finite element soil-pile interaction analysis of Floodwall in soft clay (2011).