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Author

A. Lavasan

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Open access Aug 2026

A Non‐Isothermal Viscoplastic Framework for Assessing Shaft Resistance in Energy Geostructures

This study presents a coupled thermo‐hydro‐mechanical (THM) num erical investigation of shaft resistance degradation in geothermal piles embedded in low‐permeability clays. A thermo‐viscoplastic constitutive model is developed to simulate the pile–soil interface behavior under non‐isothermal conditions. The model cap...

S. Tourchi, A. Lavasan · 1 citation
Open access Aug 2026

Thermo–hydro–mechanical modeling of a TBM tunnel in Opalinus Clay: Thermal coupling effects on long-term lining pressures and excavation damage zone development

Tunnels in argillaceous formations such as Opalinus Clay (OPA) develop a coupled thermal, hydraulic, and mechanical response. This study examines the New Belchen Tunnel (STB), excavated by tunnel boring machine through faulted OPA shale. Field measurements show a strong relation between lining temperature and radial pr...

S. Tourchi, M. Ziegler, A. Lavasan · 1 citation
Preprint Sep 2026

A Non-Isothermal Viscoplastic Constitutive Model for Clay Slip Surfaces

Clayey slip surfaces control the reactivation and long-term deformation of slow-moving landslides and may experience thermal fluctuations from climate, seasonal ground-temperature changes, or subsurface heat sources. Experiments show that residual shear strength depends on temperature and shearing rate, yet most numeri...

S. Tourchi, E. Badakhshan, Milad Jabbarzadeh et al. · 1 citation
Open access Jul 2026

Thermally induced volumetric response of natural clays: effects of OCR, plasticity, and recent stress history.

Understanding the thermally induced volumetric response of fine-grained soils is important for geo-energy systems, underground storage facilities, and radioactive waste repositories. This study examines the thermo-mechanical response of two natural silty clays from Budapest, Hungary, with different plasticity levels an...

Hamed Hoseinimighani, S. Tourchi, A. Lavasan et al. · 1 citation

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