Personal Academic Website

Junfeng Ren

I am a PhD candidate in geotechnical engineering at École Nationale des Ponts et Chaussées and Laboratoire Navier, studying the thermo-hydro-mechanical behaviour of Callovo-Oxfordian claystone for deep geological disposal of radioactive waste.

View publications Email me

Rock Mechanics Thermo-Hydro-Mechanical Behaviour

Claystone

Testing

MFront

FEniCSx

Profile

My doctoral work combines laboratory testing, constitutive modelling, and finite element simulation to understand the coupled response of saturated claystone under thermal, hydraulic, and mechanical loadings.

Position: PhD Candidate in Geotechnical Engineering
Affiliation: École Nationale des Ponts et Chaussées · Laboratoire Navier
Location: Paris, France

Research

Research Areas

Experimental THM characterization of Callovo-Oxfordian claystone through isotropic and triaxial tests under coupled loading paths.
Constitutive modelling of anisotropy, viscoplasticity, and thermal compaction, with implementation in MFront.
Finite element simulations in FEniCSx for laboratory tests and underground structure response.

Selected Publications

Publications

2026

Poro-elasto-viscoplastic behaviour of in-situ heated Callovo-Oxfordian claystone: Laboratory investigation and constitutive modelling

Ren J., Braun P., Plúa C., Vu M.N., Armand G., Ghabezloo S.

Rock Mechanics and Rock Engineering, under revision

2025

Thermal compaction, plastic expansion, and their interaction: Thermo-mechanical behaviour of a saturated shale

Ren J., Braun P., Plúa C., Vu M.N., Armand G., Ghabezloo S.

Manuscript in preparation

Education & Experience

Education

2022-2026

PhD in Geotechnical Engineering

École Nationale des Ponts et Chaussées, Laboratoire Navier. Supervisors: Siavash Ghabezloo, Patrick Dangla, Philipp Braun.

2019-2021

Engineering Degree in Civil Engineering

Double degree at École Nationale des Ponts et Chaussées.

2018-2022

Master’s Degree in Highway Engineering

Southeast University, double-degree programme.

Bachelor

Bachelor’s Degree in Road Engineering

Southeast University.

2021

Final-year research internship

Simulation of the hydration and homogenization of oil-well cement at Laboratoire Navier.

Teaching

Supervision and practical sessions

Co-supervised two master’s interns and contributed to practical sessions in soil mechanics.

Contact

Let’s Talk

I am interested in postdoctoral opportunities in experimental and numerical rock mechanics, especially underground storage and geothermal systems.

[email protected] ResearchGate LinkedIn