RT info:eu-repo/semantics/article
T1 An adjusted analytical solution for thermal design in artificial ground freezing
A1 Sancho Calderón, Diego
A1 Ortiz Palacio, Santiago
A1 Ibáñez García, Sergio
A1 Bock, Sven
K1 Groundwater control
K1 Artificial ground freezing
K1 Thermal desing
K1 Stefan problem
K1 Analytical solution
K1 Phase change
K1 Construcción
K1 Building
K1 Ingeniería civil
K1 Civil engineering
AB Artificial ground freezing is a widely used, reliable method for excavation in water-bearing ground. The questions posed in the thermal design of ground freezing projects require solving moving boundary (Stefan) problems. Approximate analytical solutions, such as the ones by St¨ander1 and Sanger and Sayles,2 have beendeveloped for thermal engineering design and are used by practitioners across the industry. For instance, Sanger& Sayles’ solution is widely used for the single-freeze-pipe problem, but it has proven to be of limited accuracy.3In the present paper, an adjustment to this formula is proposed based on the re-evaluation of their empiricalassumption that the ratio between the temperature penetration depth and the phase-change radius equals aconstant value of 3 regardless the conditions. A sensitivity study is performed using a verified numerical model asa benchmark to study several problems with different initial and boundary conditions (initial, phase change andfreeze pipe temperatures) and thermal properties of the ground (water content, thermal conductivity and heatcapacity). This is done for the freezing times of 10 and 365 days, in order to consider the potential change of theratio with the freezing time. In this way, a calibrated formula is proposed to find appropriate values of this ratioand a suitable adjustment to Sanger & Sayles’ solution is determined. Adjusting Sanger & Sayles’ solution in thismanner, a significantly higher and more consistent accuracy is achieved for different boundary and initialconditions. This accuracy improvement was checked for real conditions from an engineering project, whichshows that the adjustment can be useful for thermal problems in engineering design of ground freezing.
PB Elsevier
SN 1365-1609
YR 2023
FD 2023-04
LK http://hdl.handle.net/10259/7498
UL http://hdl.handle.net/10259/7498
LA eng
DS Repositorio Institucional de la Universidad de Burgos
RD 11-may-2024