Abstract
The ground-heating method using the electric heating pipe improves many problems of the conventional soft-ground improvement method and the ground-heating method using fossil fuel. However, in order to use this method practically, it is necessary to experimentally verify the temperature change due to the discharge of water vapor, and also to compare the theoretical solution and numerical analysis for estimation of the temperature distribution. From the experimental result, the loss of heat energy due to the discharge of water vapor is very large. Because the linear heat-source model and numerical analysis cannot consider the heat-energy loss by water vapor, the temperature change is estimated to be large. Therefore, it is necessary to design the installation depth of the electric heating pipe to suppress the discharge of water vapor.
Highlights
In order to use industrial and residential land, we are developing soft grounds such as tidal flats
The purpose of this study is to investigate the heat-transfer characteristics of water vapor generated by ground heating
The conclusions of this study are as follows: 1. The heat-transfer properties of the saturated ground changed according to the presence and absence of water vapor discharged by heating
Summary
In order to use industrial and residential land, we are developing soft grounds such as tidal flats. Marine clays such as tidal flats have a very small permeability, so that excess pore water pressure is generated by the preloading of embankment, and it is drained by the vertical drainage of sand Because this method requires a large amount of sand, deforestation and land degradation are serious [1]. Because the permeability of the clay is very small, the consolidation of clay takes about five to 10 years to complete [2] To solve this problem, Beles and Stănculescu [3], and Litvinov [4], developed a ground-heating method using fossil fuels. The strength of the clay sintered by the ground heating is rapidly increased, and the ground can be improved and utilized as a construction site [4,9,10,11]
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