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Title:	Zur thermisch-hydraulisch-mechanisch gekoppelten Simulation eines Energiepfahls
Abstract:	Thermische Aktivierung von Pfählen bietet eine wirtschaftliche Möglichkeit, oberflächennahe Geothermie zu nutzen. Allerdings verursacht die Temperaturänderung in den Pfählen und im umliegenden Boden eine Wärmedehnung. Da die Temperaturänderungen nicht gleichmäßig und die Wärmeausdehnungskoeffizienten von Beton und Boden unterschiedlich sind, wird die Interaktion zwischen diesen dadurch beeinflusst. In diesem Artikel wird das thermisch-hydraulisch-mechanische (THM) Verhalten eines Energiepfahls mit numerischen Methoden untersucht. Ein visko-hypoplastisches Stoffmodell wird verwendet, um das viskose Verhalten einschließlich Kriechen, Relaxation und Viskosität eines bindigen Bodens abzubilden. Die numerischen Ergebnisse werden mit Messergebnissen eines Feldtests verglichen. Thermo-hydro-mechanical coupeld simulation of an energy pile. Thermal activation of piles provides a cost-effective opportunity to use shallow geothermal energy. However, the temperature changes in piles and soils induce thermal expansion. As temperature changes and the thermal expansion coefficients of concrete and soils are not the same, the interaction between them will be affected. In this article the thermal-hydro-mechanical behaviour of an energy pile is simulated. A visco-hypoplastic soil model is used to reproduce the viscose behaviour including creep, relaxation and rate dependency of fine grained soils. The numerical results will be compared with measurements of a field test.
Source:	geotechnik 34 (2011), No. 4
Page/s:	264-275
Language of Publication:	German

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