Searched for: author%3A%22Vardon%2C+P.J.%22
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Abels, H.A. (author), Barnhoorn, A. (author), Daniilidis, Alexandros (author), Bruhn, D.F. (author), Drijkoningen, G.G. (author), Elliott, K.N. (author), van Esser, B.T.M. (author), Laumann, S.J. (author), van Paassen, P.A.M. (author), Vargas Meleza, L. (author), Vondrak, A.G. (author), Voskov, D.V. (author), Vardon, P.J. (author)
A geothermal doublet has been installed in a sedimentary reservoir for direct-use heating on the TU Delft campus, targeted to supply around 25 MW of thermal energy at peak conditions. This contribution presents the implementation and initial data collection from the doublet, including an initial evaluation of the logging and coring campaign....
abstract 2024
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Vardon, P.J. (author), van der Schans, M.L. (author), Koulidis, K.A. (author), Grubben, T.M. (author), Beernink, S.T.W. (author), Bloemendal, Martin (author)
At present, over half of all primary energy used in Europe is used for heating and cooling. Therefore, decarbonizing the heating supply is essential to achieve climate targets. Underground thermal energy storage is a key enabling technology for the energy transition to buffer the large seasonal mismatch between thermal energy demand and...
abstract 2024
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Gerola, M. (author), Cecinato, Francesco (author), Haasnoot, Jacco K. (author), Vardon, P.J. (author)
In recent decades, there has been a notable rise in the utilization of the subsurface as a source for heating and cooling through shallow geothermal installations. This trend is exemplified by the emergence of Energy Geostructures (EGs), an innovative technology that not only provides structural support to the ground or buildings but also...
abstract 2024
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Gonzalez Acosta, J.L. (author), Mánica, Miguel A. (author), Vardon, P.J. (author), Hicks, M.A. (author), Gens, Antonio (author)
This paper investigates the implementation of a nonlocal regularisation of the material point method to mitigate mesh-dependency issues for the simulation of large deformation problems in brittle soils. The adopted constitutive description corresponds to a simple elastoplastic model with nonlinear strain softening. A number of benchmark...
journal article 2024
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Kirschstein, Xenia (author), Ohagen, Max (author), Reber, Joscha (author), Vardon, P.J. (author), Bishara, Nadja (author)
Ground source heat pumps (GSHP) coupled to shallow borehole heat exchangers (BHE) represent a low emission technology to provide space heating and cooling. However, ongoing long-term heating or cooling of the ground caused by unbalanced loads leads to a performance decline and in the worst case to a system shutdown. Enhanced regeneration can...
review 2024
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Luo, W. (author), Kottsova, A. (author), Vardon, P.J. (author), Dieudonné, A.A.M. (author), Brehme, M. (author)
In geothermal projects, reinjection of produced water has been widely applied for disposing wastewater, supplying heat exchange media and maintaining reservoir pressure. Accordingly, it is a key process for environmental and well performance assessment, which partly controls the success of projects. However, the injectivity, a measure of how...
review 2023
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Zheng, X. (author), Seaid, Mohammed (author), Pisano, F. (author), Hicks, M.A. (author), Vardon, P.J. (author), Huvaj, Nejan (author), Osman, Ashraf S. (author)
A hybrid material point/finite volume method for the numerical simulation of shallow water waves caused by large dynamic deformations in the bathymetry is presented. The proposed model consists of coupling the nonlinear shallow water equations for the water flow and a dynamic elastoplastic system for the seabed deformation. As a constitutive...
journal article 2023
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Li, Jianguo (author), Wang, Bin (author), Wang, Di (author), Zhang, Pei (author), Vardon, P.J. (author)
Aiming at modelling the mechanical behaviour of soil-rock mixtures accurately and efficiently, a coupled MPM-DEM formulation combining the material point method (MPM) and the discrete element method (DEM) is proposed. It is solved concurrently via the contact force linking the two individual methods. Specifically, the soil is modelled with...
journal article 2023
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Vardon, P.J. (author), Aguilar Lopez, J.P. (author), Dieudonné, A.A.M. (author)
Soil-atmosphere interaction occurs frequently in most geotechnical situations. By including it in analyses, a high computational load can occur, and analyses are made more complex. This paper explores the key processes and demonstrates the impact and advantages of quantifying soil-atmosphere interactions. Possibilities of utilising the soil...
conference paper 2023
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Mohsan, M. (author), Vossepoel, F.C. (author), Vardon, P.J. (author)
Different data assimilation schemes such as the ensemble Kalman filter (EnKF), ensemble smoother (ES) and ensemble smoother with multiple data assimilation (ESMDA) are implemented in a hydro-mechanical slope stability analysis. For a synthetic case, these schemes assimilate displacements at the crest and the slope to estimate strength and...
journal article 2023
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Liaudat, J. (author), Dieudonné, A.A.M. (author), Vardon, P.J. (author)
Geological Disposal Facilities (GDF) for radioactive waste will generally rely on clay-rich materials as a host geological formation and/or engineered barrier. Gas will be produced within the GDF, which can build up significant gas pressure and will activate the migration of gas through the clay materials via different transport mechanisms....
journal article 2023
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Golchin, A. (author), Guo, Y. (author), Vardon, P.J. (author), Liu, S. (author), Zhang, G. (author), Hicks, M.A. (author)
The coupling effect of initial shear stress and thermal cycles on the thermomechanical behaviour of clay concrete and sand-concrete interfaces has been studied. A set of drained monotonic direct shear tests was conducted at the soil-concrete interface level. Samples were initially sheared to half of the material's shear strength and then they...
journal article 2023
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Guo, Y. (author), Golchin, A. (author), Hicks, M.A. (author), Liu, Songyu (author), Zhang, Guozhu (author), Vardon, P.J. (author)
The effect of temperature on the monotonic and cyclic shearing response of a soil–structure interface is of critical importance for the application of thermal-active geo-structures. To investigate this, soils and soil–concrete interfaces were comprehensively tested with a temperature-controlled direct shear device under both fixed...
journal article 2023
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Beernink, S.T.W. (author), Hartog, Niels (author), Vardon, P.J. (author), Bloemendal, Martin (author)
The technical and economic success of an Aquifer Thermal Energy Storage (ATES) system depends strongly on its thermal recovery efficiency, i.e. the ratio of the amount of energy that is recovered to the energy that was injected. Typically, conduction most strongly determines the thermal recovery efficiency of ATES systems at low storage...
journal article 2023
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Mohsan, M. (author), Vardon, P.J. (author), Vossepoel, F.C. (author)
Data assimilation methods have been implemented on a slope stability problem, and the performance of different constitutive models and data assimilation schemes has been investigated. In the first part, a data assimilation scheme called the ensemble Kalman filter (EnKF) is implemented using a finite element model (FEM) and its performance with...
conference paper 2023
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Do, Phuong Chinh (author), Vardon, P.J. (author), Gonzalez Acosta, J.L. (author), Hicks, M.A. (author)
The material point method (MPM) is gaining an increasing amount of attention due to its capacity to solve geotechnical problems involving large deformations. Large deformations in geotechnics usually involve the failure process and therefore dynamic analyses are often carried out. However, simulating the (infinite) continuous domain using...
conference paper 2023
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Kulshreshtha, Y. (author), Vardon, P.J. (author), Meesters, G.M.H. (author), van Loosdrecht, Mark C.M. (author), Mota, Nelson (author), Jonkers, H.M. (author)
The water-resistance of cow-dung has made it a widely used stabiliser in traditional earthen structures in several Asian and African countries. Multiple studies have shown an improvement in water-resistance with the addition of cow-dung, but none provides insight into this behaviour. The present study investigates the water-resistance behaviour...
journal article 2022
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Chandan Malagar, B.R. (author), Vardon, P.J. (author), Dieudonné, A.A.M. (author)
poster 2022
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Liaudat, J. (author), Dieudonné, A.A.M. (author), Vardon, P.J. (author)
conference paper 2022
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Luo, W. (author), Vardon, P.J. (author), Cox, Barbara (author), Dieudonné, A.A.M. (author)
and boundary connected with aquifer respectively, are discussed. On the basis of these two boundary conditions, several factors that influence the fluid loss process are studied. For the thief zone with no-flow boundary, our key conclusions illustrate that once the pressure front reaches an opening in the sealing, fluid loss occurs. However,...
abstract 2022
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