Reza Ahmadi-NaghadehJönköping University · Department of Civil Engineering/Lighting Design
Reza Ahmadi-Naghadeh
Ph.D.
About
15
Publications
3,346
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45
Citations
Citations since 2017
Introduction
Skills and Expertise
Additional affiliations
March 2019 - March 2020
September 2017 - March 2019
September 2017 - March 2019
Position
- PostDoc Position
Description
- My postdoctoral position includes both teaching and research activities. - ACE045 Geological and geotechnical site characterization - BOM045 - Geotechnics
Publications
Publications (15)
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 de-structures when taken to large strains, especially under dynamic loading, leading to remarkably high pore pressures beneath penetrating CPT and driven pile tips, weak put...
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 tests, define the conditions under which either thousands of cycles could be applied without any deleterious eff...
Low-to-medium density chalk can be de-structured 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-carrying capacities. This paper reports undrained triaxial experiments on de-structured chalk, which shows distinctl...
The potential of X-ray scattering measurements for monitoring changes on the nano-scale in fine-grained materials in their natural wet state is demonstrated with a series of feasibility tests on well-controlled, kaolin samples – that is, water content, pH and loading history. The results indicate that subtle changes on the nanometric scale, especia...
An exponential equation is introduced to predict the nonlinear variation of shear strength with matric suction for unsaturated soils. The proposed equation involves three constant parameters, two of which are effective shear strength parameters (i.e., ϕ′ and c′). The third parameter is the maximum capillary cohesion, c''max, which is the maximum po...
X-ray scattering is a promising non-invasive technique to study evolving nano- and micromechanics in clays. This study discusses the experimental considerations and a successful method to enable X-ray scattering to study clay samples at two extreme stages of consolidation. It is shown that the proposed sample environment comprising flat capillaries...
A new procedure for the preparation of low-plasticity silt specimens that are isotropically reconstituted from slurry is developed for use in both saturated and unsaturated soil testing. Spatial variations of the water content and grain size distribution were examined to confirm the uniformity of the specimens (regarding void radio and segregation)...
Response of unsaturated soils constitutes an important consideration for many problems in geotechnical engineering. The main objective of this study is to understand coupling hydro-mechanical behavior of the unsaturated reconstituted specimens from slurry and moist-tamped compacted specimen, and to develop practical and cost-effective testing equip...
Most soils that concern geotechnical engineering are in the state of partial water saturation. Current practice tries to predict engineering properties of cohesionless soils using data from tests on saturated specimens, regardless of the saturation in the field. Due to complexity of test setups and high technical requirements, unsaturated soil test...
One of the most significant current discussions in geotechnical engineering is construction of deep excavations in urban areas, which may result in noticeable financial and life losses in the case of failure. Therefore, the safety of adjacent ground and structures becomes an increasing concern for engineers and contractors. Consequently, it would b...
Most soils that concern geotechnical engineering are in the state of partial water saturation. Current practice tries to predict engineering properties of cohesive soils using data from tests on saturated specimens, regardless of the saturation in the field. Due to complexity of test setups and high technical requirements, unsaturated soil tests ar...
Change in the volume of a soil specimen is related to its pore-fluid. In saturated soils, volume change can be measured by monitoring the inflow or outflow of pore water from the specimen. However, conventional techniques of measuring the volume change are not applicable to unsaturated soil specimens due to presence of air phase. Over the past deca...
Projects
Projects (2)
The ALPACA project started in October 2017 with funding from EPSRC (£1.38m) and Industry (£390k; contributions from Atkins, Cathie Associates, DNVGL, Fugro, GCG, Iberdrola/SPR, Innogy, LEMS, ØRSTED, Siemens, Statoil) aiming to develop new driven pile design guidance for chalk sites through a comprehensive programme of high quality field tests, advanced laboratory testing, rigorous analysis and synthesis with other case history data. The Academic Work Group comprises academics and researchers from Imperial College London (project lead) and Oxford University, with the key aim to develop design procedures that overcome, for chalk, the current shortfalls in knowledge regarding pile driving, ageing, static and cyclic response under axial and lateral loading. The research has applications with offshore wind turbines and oil platforms as well as port, bridge and other works.
