Pooya Hamdi

Pooya Hamdi
RWTH Aachen University

About

18
Publications
6,324
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189
Citations
Citations since 2016
11 Research Items
175 Citations
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20162017201820192020202120220102030
Introduction
Pooya Hamdi is currently a Senior Scientist at RWTH Aachen in Germany. Prior to that, He worked at Golder Associate in Vancouver as Rock Mechanics Specialist for three years and a half. He holds a PhD degree from the Department of Earth Sciences, Simon Fraser University. Pooya conducts research on Civil Engineering, Mining Engineering and Remote Sensing. His main area of research is characterizing the brittle failure in rocks using advanced numerical modelling and laboratory testing.

Publications

Publications (18)
Article
The stress state in a rock mass is complex. Stress redistribution around underground excavation may lead to various failure modes, including compressive-shear, tensile-shear, and tensile failures. The ability to perform laboratory tests with these complex stress states is significant for establishing new strength criteria. The present paper introdu...
Article
Tunnelling conditions characterized by large and long-term deformations demand yielding support elements as a part of the shotcrete lining. The yielding support elements transform radial displacements into a tangential closure without compromising the lining system's support capacity and avoiding micro-cracking and overstressing of the shotcrete du...
Article
The stability analysis of underground excavations constructed in low-permeable rocks requires a comprehensive understanding of the short- and long-term pore pressure response around the excavation. This paper presents the results of a novel in-situ experiment, which was conducted in Opalinus Clay at the Mont Terri Underground Rock Laboratory, Switz...
Article
A comprehensive characterization of clay shale behaviour requires quantifying both geomechanical and hydromechanical characteristics. This paper presents a comparative laboratory study of different methods to determine the water permeability of saturated Opalinus Clay: i) pore pressure oscillation, ii) pressure pulse decay, and iii) pore pressure e...
Conference Paper
Full-text available
Common approaches to slope stability for rock slopes involve representing the rock mass as a continuum. Rock mass properties are estimated based on the intact properties of the rock and on the nature of the rock fabric, notably fracture spacing and condition. However, typically there are one or more well-developed fracture sets that provide prefere...
Conference Paper
Full-text available
Spalling and rock bursting are two common modes of failure in underground civil and mining excavations under high in-situ stress regimes. Depth of spalling failure around underground openings is stress-driven and proportional to the size of the tunnel. Various modelling approaches based on continuum, discontinuum and hybrid methods have been propos...
Conference Paper
Full-text available
This study focuses on the use of a predictive three dimensional distinct element numerical model to assess the potential for large-scale failure mechanisms at a diamond mine in Canada. The upper portion of the kimberlite pipe has been exploited by traditional open pit mining method and currently mining continues underground beneath open pit with a...
Conference Paper
Full-text available
Step path slope failures form as a combination of sliding on fracture surfaces and tensile failure of rock bridges between those fractures. This paper presents a new method for estimating rock bridges using a searching algorithm that identifies potential failure pathways through Discrete Fracture Network (DFN) models which more realistically repres...
Article
Full-text available
Heterogeneity is an inherent component of rock and may be present in different forms including mineral heterogeneity, geometrical heterogeneity, weak grain boundaries and micro-defects. Microcracks are usually observed in crystalline rocks in two forms: natural and stress-induced; the amount of stress-induced microcracking increases with depth and...
Conference Paper
Full-text available
Rock masses are typically conceptualized as having bimodal strength characteristics, with deformation controlled by complex interactions between intact rock material and discontinuities. This spatial heterogeneity has driven engineers and scientists to develop increasingly complex numerical simulation codes to capture this intricate behaviour. One...
Conference Paper
Full-text available
The suitability of hybrid 2D-FEM/DEM methods for simulating brittle failure laboratory testing has been described by numerous researchers emphasizing their ability to illustrate clearly the transition from an intact rock continuum to a discontinuum fractured state. However, there remains a need to further characterize brittle failure under varying...

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Projects

Projects (4)
Project
Fracture initiation and propagation in the surrounding of tunnel excavations in highly stressed rocks may initiate during the tunneling process and develop over time. These progressive brittle fracturing may lead to an interconnected fracture network typically associated with the radiation of micro-seismic signals. Within the excavation damage zone (EDZ), the permeability is often enhanced by two to three orders of magnitude and – in the framework of nuclear waste disposal – may provide preferential pathways for radionuclide migration. Within the PRECODE experiment, we investigate the development and time dependent changes around a tunnel at the Bedretto Underground Laboratory for Geosciences and Geoenergies (BULGG) in Ticino (Switzerland). The infrastructure and experimental design will be integrated with ongoing projects at LIH, such as the FEAR and SPINE experiments. Within PRECODE we will establish a new, 100 m long experimental tunnel as a branch from the existing Bedretto tunnel, which will be densely instrumented with strain, pore pressure and micros-seismic sensors prior to the excavation. In main objectives of the PRECODE experiment are to understand: (1) Short-term rock mass behavior and EDZ formation during tunnelling; (2) Long-term fracture propagation within the EDZ associated with environmental conditions; (3) Permeability changes with time around an open excavation and (4) the impact of tunneling on dislocations across nearby fault zones.
Project
The aim of this project is to develop a fully coupled hydro-mechanical (HM) constitutive model to predict the physical behaviour of Opalinus (OPA) Clay under various loading and unloading conditions. We integrate existing as well as new HM-coupled laboratory/field experiments and numerical simulations to develop, implement, and validate a constitutive model.
Project
Development of customizable yielding elements for squeezing ground conditions in tunnellling.