PhD Studentship in Geotechnical Engineering

3.5-year D.Phil. studentship

Project: Nature-based and biomimetic foundation systems

Supervisors: Professor Jonathan Knappett and Professor Chris Martin

The root systems of trees provide ‘foundations’ that develop in response to the loads applied to the tree. For example, trees subjected to high winds (inducing large moments) develop roots prioritising lateral spread rather than depth to maximise overturning resistance. In addition to direct applications, e.g. windthrow hazard assessment, greater understanding of how root system architecture and geometry provide resistance to different combinations of applied loading can suggest new biomimetic foundation concepts that harness similar mechanisms and potentially use significantly less material than conventional solutions.

This studentship will begin by exploring how different tree root system architectures behave under different combinations of vertical (V), horizontal (H) and moment (M) loading and identifying the controlling mechanisms. This will be achieved using a recently developed numerical modelling approach for efficiently simulating complex root-soil interaction, coupled with physical model testing to determine root-soil interaction parameters. The results will have direct application to hazard assessment of trees subject to extreme weather (e.g. windthrow and tsunami protection by mangroves).

The results of the first phase will then inform the development and evaluation of biomimetic foundation concepts that can be scaled-up in size and optimised in configuration for a variety of applications with load cases analogous to those where trees perform well. Such systems can potentially minimise embodied carbon through efficient geotechnical performance and minimise installation plant requirements by being assembled from multiple smaller/lighter elements. This could make them suitable for a range of applications that could include: (i) line-side cantilever gantries for railway electrification; (ii) transmission tower and solar farm foundations; (iii) anchorage systems for floating offshore renewable energy systems; or (iv) low-rise building foundations in remote areas.

Eligibility

This studentship is funded through the Department of Engineering Science and is open to home and overseas students (full award: fees plus stipend).

Award Value

Course fees are covered at the level set for home or overseas students, as applicable. The stipend (tax-free maintenance grant) is provided at c. £21,805 p.a. for the first year, and at least this amount for a further two and a half years.

Candidate Requirements

Prospective candidates will be judged according to how well they meet the following criteria:

• A first class or strong upper second-class undergraduate degree with honours (or equivalent) in Engineering, Applied Mathematics or Physics;
• Evidence of previous study in one (or more) of: Geotechnical Engineering or Structural Engineering, or a cognate area such as Continuum Mechanics or Mechanical component/materials testing;
• Excellent English written and spoken communication skills evidenced as meeting the University’s higher level entry requirements.

The following skills are desirable but not essential:

• Ability to program in Matlab or Python;
• Previous experience in Finite Element Analysis.

Application Procedure

Informal enquiries are encouraged and should be addressed in the first instance to Professor Jonathan Knappett (jonathan.knappett@eng.ox.ac.uk).

Candidates must submit a graduate application form (via the ‘Apply’ button above), and are expected to meet the graduate admissions criteria. Details are available on the course page of the University website.

Please quote 27ENGCI_JK in all correspondence and in your graduate application.

Application deadline: noon on 2 December 2026 (In line with the University admissions deadline set by the University)

Start date: October 2027

£21,805 c. Stipend p.a.