Byron W. Byrne's research while affiliated with University of Oxford and other places

Publications (5)

Article
Full-text available
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...
Article
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...
Article
Full-text available
Failure envelope formulations are typically employed to assess the ultimate capacity of foundations under combined loading and for incorporation in macro-element models. However, the complex interaction between each load component, especially for six degree of freedom (6DoF) loading, means that determining satisfactory formulations is often a compl...

Citations

... The de-structured chalk's response to undrained cycling is interpreted with reference to those of saturated silts and silty-sands, as reported by Carraro et al. (2003), Mao & Fahey (2003), Hyde et al. (2006), Sanin & Wijewickreme (2006), Sağlam & Bakır (2014) and Wei & Yang (2019). Ahmadi-Naghadeh et al. (2021) report parallel research into the intact chalk's cyclic response under similar cycling, identifying behaviour that differs starkly with that of unbonded soils and compares more closely with that of rocks, concretes or metals. Bialowas et al. (2018) and Alvarez-Borges et al. (2018 report earlier testing on reconstituted SNW chalk. ...
... The programme supported the joint industry project 'axial-lateral pile analysis for chalk applying multi-scale field and laboratory testing' (ALPACA), which investigated how 37 tubular steel piles, such as those driven in offshore low-to medium-density chalk, behaved under axial and lateral, monotonic and cyclic loading at the research site at St Nicholas-at-Wade (SNW), Kent, UK . Vinck (2021) and Vinck et al. (2022) describe the SNW ground conditions and report the site's characterisation by comprehensive in situ profiling and monotonic laboratory testing. Sample variability posed a significant challenge, as with calcarenites, and testing focused on 20 low-to medium-density 'structured' (Leroueil & Vaughan, 1990) high-quality specimens from a single location and depth. ...
... This approach has been increasingly adopted to design offshore shallow foundations (Gottardi and Butterfield, 1993;Gourvenec and Randolph, 2003;Vulpe et al., 2014). Failure envelopes of skirted shallow foundations under planar vertical V, horizontal H and moment M loading have been investigated comprehensively under various boundary conditions (Bransby and Randolph, 1998;Gourvenec, 2008;Bransby and Yun, 2009;Mana et al., 2013;Liu et al., 2014;Shen et al., 2016;Dunne and Martin, 2017;Fiumana et al., 2019;Zhuang et al., 2019;Suryasentana et al., 2020Suryasentana et al., , 2021Feng et al., 2021;Liu et al., 2021;Du et al., 2022). The loading angle θ (Fig. 1) from horizontal to moment load directions (according to the right-hand rule) that obeys clockwise positive convention is set as 90 • and 270 • in most previous studies, i.e., H and M act in a plane. ...
... Recent research into improving the design of axially loaded piles in chalk through field studies with impact driven and highly insturmented jacked model piles is reported by [6][7][8][9]. A new effective stress-based approach to predict axial pile capacity has been proposed, which is currently being calibrated and checked through additional testing in the ALPACA Joint Industry Project (see [8] or [39]). The proposed method builds from the key phenomena identified during the field experiments, namely (i) the use of CPT cone resistance to track and allow for local variations in properties (ii) the marked effect of the relative distance, h from the pile tip below any given chalk horizon, normalised by effective pile radius (iii) the interface effective stress shear failure characteristics and (iv) incorporation of dilation-induced changes in radial effective stresses during axial loading. ...