The Experts below are selected from a list of 3891 Experts worldwide ranked by ideXlab platform

Richard C. Wells - One of the best experts on this subject based on the ideXlab platform.

  • taxiway embankment Construction on soft ground using in situ instrumentation and Staged Construction
    2009 International Foundation Congress and Equipment ExpoAmerican Society of Civil EngineersInternational Association of Foundation DrillingPile Drivi, 2009
    Co-Authors: Xavier C. Barrett, Thomas R Wells, Richard C. Wells
    Abstract:

    The Piedmont Triad International Airport (PTIA), Greensboro, NC is undergoing an expansion as a result of the Construction of a regional hub for Federal Express. Part of the Construction includes an embankment over an alluvial floodplain in a wetlands area. A hybrid ground modification technique was used to stabilize the soft ground, consisting of geogrids, wick drains and rock toe berms. An instrumentation program was implemented to evaluate the changing properties of the alluvial soils, lateral displacements of the embankment foundation soils, settlement of the embankment, determine the fill placement rates or appropriate waiting periods, and to prevent slope failures from occurring. This paper highlights key features of the design and instrumentation system. It describes the project conditions and considerations, the instrumentation system that was installed, the results obtained during Construction, and practical issues that were addressed during Construction.

  • Taxiway embankment over soft ground using Staged Construction
    2009
    Co-Authors: Richard C. Wells, Xavier C. Barrett, Thomas R Wells
    Abstract:

    The Piedmont Triad International Airport (PTIA), Greensboro, NC has been undergoing an expansion including a new runway (Runway 5 L-23R) and taxiway (Taxiway E) as a result of the Construction of a Mid-Atlantic regional hub for Federal Express. The presence of soft ground in the wetlands area at Taxiway E crossing required careful consideration of the effects of Construction, and wetland permitting requirements. The design of the embankments had to include minimizing the total area impact as well as prevent slope stability and bearing capacity issues during Construction. The use of ground stabilization to provide a working platform in conjunction with toe berms to maintain slope stability and wick drains to accelerate drainage, strength gain, and settlement offered benefits to all members of the project team. An instrumentation program was implemented to determine the fill placement rates or appropriate waiting periods during fill placement, and to prevent slope failures.

Thomas R Wells - One of the best experts on this subject based on the ideXlab platform.

  • taxiway embankment Construction on soft ground using in situ instrumentation and Staged Construction
    2009 International Foundation Congress and Equipment ExpoAmerican Society of Civil EngineersInternational Association of Foundation DrillingPile Drivi, 2009
    Co-Authors: Xavier C. Barrett, Thomas R Wells, Richard C. Wells
    Abstract:

    The Piedmont Triad International Airport (PTIA), Greensboro, NC is undergoing an expansion as a result of the Construction of a regional hub for Federal Express. Part of the Construction includes an embankment over an alluvial floodplain in a wetlands area. A hybrid ground modification technique was used to stabilize the soft ground, consisting of geogrids, wick drains and rock toe berms. An instrumentation program was implemented to evaluate the changing properties of the alluvial soils, lateral displacements of the embankment foundation soils, settlement of the embankment, determine the fill placement rates or appropriate waiting periods, and to prevent slope failures from occurring. This paper highlights key features of the design and instrumentation system. It describes the project conditions and considerations, the instrumentation system that was installed, the results obtained during Construction, and practical issues that were addressed during Construction.

  • Taxiway embankment over soft ground using Staged Construction
    2009
    Co-Authors: Richard C. Wells, Xavier C. Barrett, Thomas R Wells
    Abstract:

    The Piedmont Triad International Airport (PTIA), Greensboro, NC has been undergoing an expansion including a new runway (Runway 5 L-23R) and taxiway (Taxiway E) as a result of the Construction of a Mid-Atlantic regional hub for Federal Express. The presence of soft ground in the wetlands area at Taxiway E crossing required careful consideration of the effects of Construction, and wetland permitting requirements. The design of the embankments had to include minimizing the total area impact as well as prevent slope stability and bearing capacity issues during Construction. The use of ground stabilization to provide a working platform in conjunction with toe berms to maintain slope stability and wick drains to accelerate drainage, strength gain, and settlement offered benefits to all members of the project team. An instrumentation program was implemented to determine the fill placement rates or appropriate waiting periods during fill placement, and to prevent slope failures.

Joseph M Yaede - One of the best experts on this subject based on the ideXlab platform.

  • Validation of Staged Construction Pavement Design with the Falling Weight Deflectometer
    Transportation Research Record, 2016
    Co-Authors: Michael J Harrell, Steven Gillen, Joseph M Yaede
    Abstract:

    In 2005, the Illinois Tollway staff rehabilitated a 33-mi-long segment of Interstate Highway 88 in Illinois by rubblizing deteriorated jointed plain concrete pavement (JPCP) and placing a hot-mix asphalt (HMA) overlay on the rubblized JPCP. The pavement design called for the ultimate pavement structure to be constructed in two stages: the first at the time of rubblization, when at least 6.0 in. of HMA would be placed, and the second 10 years later, when 2.0 in. of HMA would be cold milled and 6.0 in. of HMA placed back. The pavement design called on the tollway staff’s experience with rubblization and research surrounding the fatigue endurance limit to develop a Staged Construction strategy. The strategy would reduce up-front Construction costs by placing a minimum of 6.0 in. of HMA at initial Construction. The tollway staff was confident that the strategy would work, but the pavement performance was monitored annually for verification. Annual monitoring included pavement distress condition surveys, defle...

Yu Bai - One of the best experts on this subject based on the ideXlab platform.

  • Displacement ductility of Staged Construction-steel tube-reinforced concrete columns
    Construction and Building Materials, 2018
    Co-Authors: Huang Yuan, Huan Peng Hong, Huang Deng, Yu Bai
    Abstract:

    Abstract The steel tube-reinforced concrete (ST-RC) column is consist of a concrete-filled steel tube embedded in reinforced concrete. As an innovative type of composite structures, there is still a lack of information on the behavior and ductility of ST-RC columns, particularly on Staged Construction-steel tube-reinforced concrete (SC-ST-RC) columns. This paper studied the mechanism of two types of ST-RC columns in a 15 storey building. A finite element (FE) model with proper material constitutive relationship was proposed for SC-ST-RC columns subjected to combined axial compressive force and lateral loading. The material nonlinearity and the interaction between steel tube and concrete were considered. The proposed FE model was able to predict the lateral stiffness, strength and deformation capacities of SC-ST-RC columns with a reasonable level of accuracy. Then, the effects of different parameters on displacement ductility were discussed in detail. Finally, a simplified formula for calculating the displacement ductility of SC-ST-RC columns was developed based on the parametric analysis, the predictions of the proposed formula fitted well with a large number of test results. Utilizing the proposed formula, the demand of displacement ductility under different seismic design grade in current ST-RC specification was presented, which may provide a useful reference for the seismic design of the SC-ST-RC structures.

Sabihi A. - One of the best experts on this subject based on the ideXlab platform.

  • Slope Stability of Embankments on Soft Soil Improved with Vertical Drains
    'Ital Publication', 2020
    Co-Authors: Kassou F., Bouziyane J. Ben, Ghafiri A., Sabihi A.
    Abstract:

    The overloads of structures or embankments built on clayey soft ground are generally applied gradually, respecting a specific phasing. This phasing on Construction allows the undrained shear strength of clay increasing over consolidation in order to avoid the risk of collapse during loading. In this work, the undrained shear strength of clay over the consolidation was estimated following SHANSEP method of which parameters proposed by eight researchers have been employed, as well as the slope stability analysis of embankments on soft soils during Staged Construction. Assessment of factor of safety for slope stability was conducted basing on the Bishop method. Additionally, the variations of undrained shear strength and factor of safety were presented. In order to validate the methods discussed in this study, slope stability analysis of five embankments constructed on clayey soft soils improved by the vertical drain technique in a high-speed railway Construction project in Morocco was performed. For these embankments, field measurements about lateral displacement are presented.  It was found that some of the adopted methods is in a good agreement with field measurements. Hence, generalization of these methods to many soft ground cases can be proposed