R. J. Jardine
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View article: Monotonic and cyclic lateral loading of piles in low- to medium-density chalk
Monotonic and cyclic lateral loading of piles in low- to medium-density chalk Open
Offshore and other structures often rely on driven piles to carry lateral loads. However, there is currently no established design method to cover lateral loading at chalk sites, which are widespread across Northwest Europe. This paper rep…
View article: Cyclic characterisation of low-to-medium density chalk for offshore driven pile design
Cyclic characterisation of low-to-medium density chalk for offshore driven pile design Open
Project-specific advanced laboratory testing is employed increasingly frequently in site investigations for major offshore projects. Such testing needs to focus on characterising properties under in-situ conditions, while also catering for…
View article: In-situ and laboratory characterisation of stiff and dense geomaterials for driven pile analysis and design
In-situ and laboratory characterisation of stiff and dense geomaterials for driven pile analysis and design Open
Integrated field and laboratory characterisation of geomaterial behaviour is critical to foundation analysis and design for a wide range of offshore and onshore infrastructure. Challenges include the need for high-quality sampling, address…
View article: Laboratory investigation of the cyclic loading behaviour of intact and de-structured chalk
Laboratory investigation of the cyclic loading behaviour of intact and de-structured chalk Open
Chalk is a soft biomicrite composed of silt-sized crushable CaCO3 aggregates. Chalk’s response to cyclic loading depends critically on its sensitive micro fabric and state, which may be altered significantly by high-pressure compression, d…
View article: The monotonic behaviour of a low- to medium-density chalk through in-situ and laboratory characterisation
The monotonic behaviour of a low- to medium-density chalk through in-situ and laboratory characterisation Open
Chalk is a highly variable cemented biomicrite limestone that can show widely different rock strengths and patterns of micro to macro fissuring and jointing, due to variations in depositional environments and local geological histories. Th…
View article: Anisotropy and cyclic loading characteristics of a stiff Bolders Bank glacial till at Cowden
Anisotropy and cyclic loading characteristics of a stiff Bolders Bank glacial till at Cowden Open
Glacial tills are widespread across the world, common in northern Europe and found under the North and Baltic Seas. Their geological and geotechnical characterisation is important to the geotechnical design of a wide range of onshore and o…
View article: Axial capacity ageing trends of large diameter tubular piles driven in sand
Axial capacity ageing trends of large diameter tubular piles driven in sand Open
The paper examines dynamic pile test data from 25 high-quality offshore cases, where end-of-initial driving (EoID) and beginning-of-restrike (BoR) instrumented dynamic monitoring was undertaken on tubular piles driven in sands at well-char…
View article: Driven pile behaviour in low-to-medium density chalk: the ALPACA JIP outcomes
Driven pile behaviour in low-to-medium density chalk: the ALPACA JIP outcomes Open
Offshore pile design presents multiple challenges in low-to-medium density chalks, whose sensitivity and brittleness often leads to very low driving resistances. Also, existing design rules have proved unable to give reliable predictions f…
View article: Monotonic Characterisation of Low-to-Medium-Density Chalk for Driven Offshore Pile Design
Monotonic Characterisation of Low-to-Medium-Density Chalk for Driven Offshore Pile Design Open
Driven piles support a substantial number of offshore wind turbines, near-shore bridges, and port facilities. Designing and installing these piles can be challenging in Chalk, a porous, low-density, weak carbonate rock prevalent beneath va…
View article: Axial cyclic loading of piles in low-to-medium-density chalk
Axial cyclic loading of piles in low-to-medium-density chalk Open
Comprehensive field investigations into the axial cyclic loading behaviour of open steel pipe piles driven and aged in low-to-medium-density chalk identify the conditions under which behaviour is stable, unstable or metastable. Post-cyclin…
View article: The axial behaviour of piles driven in chalk
The axial behaviour of piles driven in chalk Open
This paper describes research into the poorly understood axial behaviour of piles driven in chalk. Comprehensive dynamic and monotonic axial testing on 27, mostly instrumented, piles undertaken for the ALPACA joint industry projects is rep…
View article: Assessment of time effects on capacities of large-scale piles driven in dense sands
Assessment of time effects on capacities of large-scale piles driven in dense sands Open
This paper considers the axial resistances of open-ended, highly instrumented, 763 mm diameter steel pipe piles driven in sands for the EURIPIDES (EURopean Initiative on PIles in DEnse Sands) project at a well-characterized research site a…
View article: Pile setup in sand – the "PAGE" joint industry project
Pile setup in sand – the "PAGE" joint industry project Open
The reliability of long-term axial capacity predictions for large, offshore-scale, piles is uncertain. Current databases of static load tests include very few entries with diameters ≥ 1m, and none >2m. Also, most of the available tests wer…
View article: Data processing of fibre-optic strain gauge data for axial pile load testing
Data processing of fibre-optic strain gauge data for axial pile load testing Open
Field testing is invaluable for optimising pile design, particularly with new pile types, or unfamiliar or layered ground conditions. For axial pile load testing, axial shaft strain gauges can provide crucial extra information to enable mo…
View article: CPT-Based Axial Capacity Design Method for Driven Piles in Clay
CPT-Based Axial Capacity Design Method for Driven Piles in Clay Open
There are clear advantages in the establishment of reliable, direct cone penetration test (CPT) based methods for assessment of the axial capacity of driven piles. These advantages motivated the formation of a joint industry project (JIP) …
View article: An experimental investigation into the behaviour of destructured chalk under cyclic loading
An experimental investigation into the behaviour of destructured chalk under cyclic loading Open
Low-to-medium-density chalk can be destructured to soft putty by high-pressure compression, dynamic impact or large-strain repetitive shearing. These process all occur during pile driving and affect subsequent static and cyclic load-carryi…
View article: A laboratory characterisation of the response of intact chalk to cyclic loading
A laboratory characterisation of the response of intact chalk to cyclic loading Open
This paper reports the cyclic behaviour of chalk, which has yet to be studied comprehensively. Multiple undrained high-resolution cyclic triaxial experiments on low- to medium-density intact chalk, along with index and monotonic reference …
View article: Advanced in situ and laboratory characterisation of the ALPACA chalk research site
Advanced in situ and laboratory characterisation of the ALPACA chalk research site Open
Low- to medium-density chalk at St Nicholas at Wade, UK, is characterised by intensive testing to inform the interpretation of axial and lateral tests on driven piles. The chalk destructures when taken to large strains, especially under dy…
View article: Installation Effects on Stress and Grading Around Displacement Piles in Sand
Installation Effects on Stress and Grading Around Displacement Piles in Sand Open
A 3D discrete element model (DEM) is used to model earlier calibration chamber experiments that investigated the responses seen when highly instrumented model displacement piles were installed in Fontainebleu sand. The crushable DEM partic…
View article: Anisotropic Stiffness and Shear Strength Characteristics of a Stiff Glacial Till
Anisotropic Stiffness and Shear Strength Characteristics of a Stiff Glacial Till Open
Glacial tills are widespread across North America, northern and central Asia, and northern Europe, where they are also found under the Baltic, North, and Norwegian Seas. Their geological and geotechnical characterization is important to a …
View article: Interdisciplinary Mathematics For Environmental Engineers
Interdisciplinary Mathematics For Environmental Engineers Open
NOTE: The first page of text has been automatically extracted and included below in lieu of an abstract Session 2265 Interdisciplinary Mathematics for Environmental Engineers Richard J. Jardine United States Military Academy Abstract Coope…
View article: Application of the PISA design model to monopiles embedded in layered soils
Application of the PISA design model to monopiles embedded in layered soils Open
The PISA design model is a procedure for the analysis of monopile foundations for offshore wind turbine applications. This design model has been previously calibrated for homogeneous soils; this paper extends the modelling approach to the …
View article: Optimization of Impact Pile Driving Using Optical Fiber Bragg-Grating Measurements
Optimization of Impact Pile Driving Using Optical Fiber Bragg-Grating Measurements Open
This paper reports the use of optical fiber Bragg-grating (FBG) sensors to monitor the stress waves generated below ground during pile driving, combined with measurements using conventional pile driving analyzer (PDA) sensors mounted at th…
View article: Cyclic Laterally Loaded Medium Scale Field Pile Testing for the PISA Project
Cyclic Laterally Loaded Medium Scale Field Pile Testing for the PISA Project Open
The PISA project explored the development of improved design methods for offshore wind turbine monopile foundations. Medium scale field pile testing for the project took place at Cowden in the UK, where the soil consists of a heavily over-…
View article: A New 'Unified' CPT-Based Axial Pile Capacity Design Method for Driven Piles in Sand
A New 'Unified' CPT-Based Axial Pile Capacity Design Method for Driven Piles in Sand Open
This paper outlines the development of a new ‘Unified’ CPT-based method for estimating the axial capacity of driven piles in sand. The method adapts key features of the four CPT-based methods currently in the API and ISO guidelines. The ne…
View article: PISA design model for monopiles for offshore wind turbines: application to a marine sand
PISA design model for monopiles for offshore wind turbines: application to a marine sand Open
This paper describes a one-dimensional (1D) computational model for the analysis and design of laterally loaded monopile foundations for offshore wind turbine applications. The model represents the monopile as an embedded beam and speciall…