The invention discloses a device and a method for measuring a heat
conductivity coefficient of frozen earth in a three-dimensional direction. The device consists of a
temperature control box, a two-
body type soil
sample chamber and a pressurizing plate, wherein the pressurizing plate is contacted with a multifunctional material testing
machine by virtue of a pressurizing rod; the two-
body type soil
sample chamber consists of a main chamber and a right-angled sleeve wall; and the right-angled sleeve wall is connected with the main chamber by virtue of a
lantern ring and a bolt. The implementation method comprises the following steps: sequentially superposing 1-7# soil samples in the main chamber; respectively arranging sheet heat
conductivity coefficient probes on contact surfaces of the soil samples 5#, 7#, 2# and 8#; and finally superposing the soil sample 8#, and sequentially mounting the right-angled sleeve wall, the bolt, the
lantern ring and the pressurizing plate. The temperature of the frozen earth and freezing and thawing cycle process are controlled by virtue of the
temperature control box, the range of a load stressed by the frozen earth is adjusted by virtue of the multifunctional material testing
machine, accurate measurement of the three-dimensional heat
conductivity coefficient of the frozen earth is realized under
multiple factors and
coupling effects thereof, and static earth pressure stressed by the frozen earth in the horizontal direction is further calculated by virtue of the relationship between the heat conductivity coefficient in the vertical loading direction and the load.