A5053599655- Geotechnical Engineering and Underground Structures
- Geotechnical Engineering and Soil Mechanics
- Geotechnical Engineering and Soil Stabilization
- Geophysical Methods and Applications
- Geotechnical and construction materials studies
- Geotechnical Engineering and Analysis
- Seismic Waves and Analysis
- Coastal and Marine Dynamics
- Seismic Performance and Analysis
- Landslides and related hazards
- Geological formations and processes
- earthquake and tectonic studies
- Structural Health Monitoring Techniques
- Underwater Acoustics Research
- Grouting, Rheology, and Soil Mechanics
- Structural Integrity and Reliability Analysis
- Non-Destructive Testing Techniques
- Structural Behavior of Reinforced Concrete
- Wave and Wind Energy Systems
- Geological Modeling and Analysis
- Water Systems and Optimization
- Seismology and Earthquake Studies
- Advanced Computational Techniques and Applications
- Asphalt Pavement Performance Evaluation
- Aeolian processes and effects
University of Rhode Island
2016-2025
Queen's University Belfast
2017
Delft University of Technology
2017
The University of Texas at Austin
2006-2016
University of Michigan
2007-2012
North Carolina State University
2012
Merrimack College
2007-2011
Virginia Tech
2011
University of Auckland
2011
Tianjin University
2007
The 22 February 2011, Mw6.2-6.3 Christchurch earthquake is the most costly to affect New Zealand, causing 181 fatalities and severely damaging thousands of residential commercial buildings, city lifelines infrastructure. This manuscript presents an overview observed geotechnical aspects this as well some completed on-going research investigations. A unique aspect, which particularly emphasized, severity spatial extent liquefaction occurring in native soils. Overall, both was greater than...
An experimental study of uplift capacity 22 circular helical anchors installed in sand with peak friction angles between 40 and 50° was performed. Laboratory triaxial tests indicated that the dilation angle varied 10 25° for these angles. To account soil behavior exhibiting nonassociated flow (NAF), which is much less than angle, a limit equilibrium plane strain analytical solution plate anchor updated extended to axisymmetric conditions. Anchor test results were compared upper bound (UB)...
Abstract One of the most important aspects cyclic testing in laboratory is using samples that are representative their in-situ conditions. Since undisturbed cohesionless soils typically too difficult or costly to obtain, reconstituted need be prepared a method closely replicates stress, density, and fabric. Research has clearly shown effect sample preparation methods on liquefaction resistance sands, it believed wet pluviation approximate fabric fluvial soils. For pure silts, however, these...
As an alternative to a field-based liquefaction resistance approach, cyclic triaxial tests with bender elements were used develop new correlation between ratio (CRR) and overburden stress-corrected shear-wave velocity (VS1) for two nonplastic silts obtained from Providence, Rhode Island. Samples of natural silt recovered by block sampling geotechnical borings/split-spoon sampling. The data show that the is independent soils' stress history as well method prepare testing. laboratory results...
Research Article| November 01, 2011 Performance of Bridges during the 2010 Darfield and Christchurch Earthquakes Liam Wotherspoon; Wotherspoon University Auckland Private Bag 92019 1142 New Zealand l.wotherspoon@auckland.ac.nz (L. W.) 1University Auckland, Search for other works by this author on: GSW Google Scholar Aaron Bradshaw; Bradshaw 2University Rhode Island, Kingston, U.S.A. Russell Green; Green 3Virginia Tech, Blacksburg, Virginia, Clinton Wood; Wood 4University Arkansas,...
This work presents the design and installation of a continuous monitoring system for one offshore wind turbines in Block Island Wind Farm, which is located 6.1 km off coast Rhode Island, USA. The instrumentation plan includes wired wireless accelerometers, strain gauges, inclinometers. Considerations are discussed, including type, number location sensors, as well some challenges sensors. process transferring data, samples collected automated identification preliminary results presented.
Offshore wind-turbine (OWT) support structures are subjected to cyclic dynamic loads with variations in loadings from wind and waves as well the rotation of blades throughout their lifetime. The magnitude extent loading can create a fatigue limit state controlling design structures. In this paper, remaining life structure for GE Haliade 6 MW fixed-bottom jacket offshore turbine within Block Island Wind Farm (BIWF) is assessed. damage tower using stress time histories at instrumented...
This paper presents an experimental and analytical study to investigate the effect of shape on pull-out capacity shallow horizontal plate anchors in sand under drained loading conditions. Novel dynamically penetrating anchor concepts have been proposed for use offshore energy sector. These may shapes that are atypical, analysis these be needed design. Most research has focused square, rectangular or circular shapes. Physical modelling was used circular, triangular kite-shaped anchors. The 1g...
Rapid assessment of damage to buried pipelines from earthquake-induced ground deformation is a crucial component recovery efforts. This paper reports on the first year four-year study aimed at developing rapid, reliable, and cost-effective sensing systems for health monitoring detection concrete subjected deformation. A custom-designed strategy was implemented in rupture experiment with scaled-down pipeline. The behavior pipeline, including failure modes inflicted pipe segments, monitored...
This paper addresses scaling issues related to small-scale 1-g model tests on plate anchors in sand under drained loading conditions. Previous centrifuge studies from the literature have suggested that results of conventional testing are inaccurate because scale effects. Other suggested, however, errors can be reduced if presented dimensionless form and constitutive response soil is representative prototype behavior. There no experimental tested validity this approach for anchors. A simple...
Research Article| November 01, 2011 Performance of Levees (Stopbanks) during the 4 september 2010 Mw 7.1 Darfield and 22 February 6.2 Christchurch, New Zealand, Earthquakes Russell A. Green; Green Department Civil Environmental Engineering Virginia Tech 120B Patton Hall Blacksburg, 24061 U.S.A. rugreen@vt.edu (R. G.) 1Department Engineering, Tech, Search for other works by this author on: GSW Google Scholar John Allen; Allen 2TRI Environmental, Duluth, Minnesota Liam Wotherspoon; Wotherspoon...
Recently developed American Society for Testing and Materials (ASTM) standards direct simple shear (DSS) testing require that the sample be laterally confined in either a wire-reinforced membrane or stack of thin rings. Although membranes are more commonly used practice, it is uncertain how results two confinement methods compare. This paper presents tests performed on high plasticity clay low organic silt to compare effects using Teflon-coated rings lateral confinement. Comparisons made...
Offshore wind turbines are subjected to significant environmental loads from a combination of current, and wave action. Under such conditions, the directions these vary over service life structure therefore cyclic lateral loading on foundation also changes direction. The work reported in this paper examines effects multi-directional performance offshore turbine monopile foundations. Tests were carried out model sand bed mobile platform was manufactured apply pile various directions. where...
Research Article| November 01, 2011 Use of DCP and SASW Tests to Evaluate Liquefaction Potential: Predictions vs. Observations during the Recent New Zealand Earthquakes Russell A. Green; Green Department Civil Environmental Engineering Virginia Tech 120B Patton Hall Blacksburg, 24061 U.S.A. (R. G.) 1Department Engineering, Tech, Search for other works by this author on: GSW Google Scholar Clint Wood; Wood 2University Arkansas, Fayetteville, Arkansas Brady Cox; Cox Misko Cubrinovski;...
This paper proposes a new approach for incorporating the positive attributes of small-strain shear wave velocity (VS), stress-based simplified procedure and cyclic strain into penetration test, liquefaction triggering models, with objective more fully accounting influence intrinsic soil properties state variables on triggering. Current procedures are limited in their ability to capture effects (grain size, mineralogy, grain shape, etc.) (stress state, void ratio, fabric, etc.). To overcome...
This paper investigates the resilient moduli of reclaimed asphalt pavement (RAP) and virgin aggregate blends obtained from subbase a segment Route 165 in Rhode Island, U.S. The materials included RAP aggregates that were blended off-site using cold recycled RAP, as well generated situ full-depth reclamation (FDR). Cyclic triaxial tests performed on compacted specimens to assess their modulus (MR) behavior. Selected FDR mixed with various stabilizer treatments including liquid calcium...
This paper presents the results of a field load test program used to investigate group effects on pullout capacity single-helix “deep” helical piles/anchors in sand. The high tensile and silent installation piles has given them serious consideration as an alternative conventional deep foundations anchors for offshore renewable energy structures. New applications may consider use groups resist structural loads. Group interaction are known occur piles, but there is scarcity data sands under...
Concrete pipelines are one of the most popular underground lifelines used for transportation water resources. Unfortunately, this critical infrastructure system remains vulnerable to ground displacements during seismic and landslide events. Ground may induce significant bending, shear, axial forces concrete eventually lead joint failures. In order understand model typical failure mechanisms segmented pipelines, large-scale experimentation is necessary explore structural soil-structure...
Abstract In recent times, interest in dynamically installed foundation systems for deep-sea construction has increased; however, these are still under development and need quantification of various soil parameters with different perspectives. For the design foundations, it is essential to assess strain-rate effect on very soft soils. The T-bar been widely used characterize offshore sediments, such as silt clay, there extensive existing literature interpretation test results. Strain-rate...
The 22 February 2011, Mw6.2 Christchurch earthquake is the most costly to affect New Zealand, causing an estimated 181 fatalities and severely damaging thousands of residential commercial buildings. This paper presents a summary some observations made by NSF-sponsored GEER Team regarding geotechnical/geologic aspects this earthquake. focused on documenting occurrence severity liquefaction lateral spreading, performance building bridge foundations, buried pipelines levees, significant...