Abstract: A heat transfer pipe embedded in a prefabricated pipe pile including a plurality of prefabricated pipe piles, a heat transfer pipe component and a pump assembly; the prefabricated pipe pile sealed by closing the bottom thereof and sides of which are provided with inclined holes; a locking pin provided at an inner wall of the pipe pile; a steel plate provided on the locking pin, and a steel bar structure bound on the steel plate; the heat transfer pipe component comprises a horizontal heat transfer pipe communicated with a vertical heat transfer pipe with both pipes communicated with the pump assembly, the horizontal pipe embedded and fixed via the steel bar structure, the vertical heat transfer pipe passes through the inclined holes and fixed in the pipe pile via a steel bar bracket.

Abstract: A heat transfer pipe embedded in a prefabricated pipe pile including a plurality of prefabricated pipe piles, a heat transfer pipe component and a pump assembly; the prefabricated pipe pile sealed by closing the bottom thereof and sides of which are provided with inclined holes; a locking pin provided at an inner wall of the pipe pile; a steel plate provided on the locking pin, and a steel bar structure bound on the steel plate; the heat transfer pipe component comprises a horizontal heat transfer pipe communicated with a vertical heat transfer pipe with both pipes communicated with the pump assembly, the horizontal pipe embedded and fixed via the steel bar structure, the vertical heat transfer pipe passes through the inclined holes and fixed in the pipe pile via a steel bar bracket.

Abstract: The present invention discloses a transparent frozen soil, which is prepared from a fluorine-containing polymer, ice particles and a colorless pore fluid by steps of preparing materials, blending, vacuuming, consolidating, and freezing. The fluorine-containing polymer is poly[4,5-difluoro-2,2bis(trifluoromethyl)-1,3-dioxole-co-tetrafluoroethylene], with the refractive index of 1.31, the particle diameter ?0.074 mm, and the density of 2.1-2.3 g/cm3. The present invention also provides the application of above transparent frozen soil in the frozen soil directional blasting model test and the frozen soil road embankment model thaw-slumping landslide test.

Abstract: The present invention discloses a transparent frozen soil, which is prepared from a fluorine-containing polymer, ice particles and a colorless pore fluid by steps of preparing materials, blending, vacuuming, and freezing. The fluorine-containing polymer is poly[4,5-difluoro-2,2bis(trifluoromethyl)-1,3-dioxole-co-tetrafluoroethylene], with the refractive index of 1.31, and are particles with the particle diameter of 0.25-2.0 mm, and the density of 2.1-2.3 g/cm3. The present invention also provides the application of the above transparent frozen soil in the frozen soil directional blasting model test and the frozen soil road embankment model thaw-slumping test.

Abstract: Particles of a fluorine-containing polymer used as a transparent solid material in an artificial transparent frozen soil is provided. The fluorine-containing polymer is poly[4,5-difluoro-2,2bis(trifluoromethyl)-1,3-dioxole-co-tetrafluoroethylene], with a refractive index of 1.31 and a density of 2.1-2.3 g/cm3. The particles have a particle diameter of 0.25-2.0 mm or a particle diameter 0.074 mm, and have irregular shapes. When particles of the fluorine-containing polymer are used as a transparent solid material for preparing a transparent frozen soil, the prepared transparent frozen soil has high transparency, low price, no toxicity and no harm, good similarity with the properties of a natural frozen soil body, can substitute natural frozen soil, is used for simulating complicated geological conditions, and is effectively used in model tests in geotechnical engineering.

Abstract: The present invention discloses a transparent frozen soil, which is prepared from a fluorine-containing polymer, cube ice and a colorless pore fluid by steps of preparing materials, blending, vacuuming, consolidating, and freezing. The fluorine-containing polymer is Teflon AF 1600 produced by American DuPont Company, with the refractive index of 1.31, the particle diameter ?0.074 mm, and the density of 2.1-2.3 g/cm3. The present invention also provides the application of above transparent frozen soil in the frozen soil directional blasting model test and the frozen soil road embankment model thaw-slumping landslide test. The transparent frozen soil prepared by the present invention can well simulate the properties of natural transparent frozen clay, is effectively used in model tests in the geotechnical engineering, with accurate measurement results, and can realize the visualization of the internal deformation of a soil body, and it is low in the expense, and simple in the operation.

Abstract: The present invention discloses the application of a fluorine-containing polymer in the preparation of a transparent frozen soil, which is used as a transparent solid material while in the preparation of a transparent frozen soil, wherein the fluorine-containing polymer is Teflon AF 1600 produced by American DuPont Company, with the refractive index of 1.31 and the density of 2.1-2.3 g/cm3, and are particles with the particle diameter of 0.25-2.0 mm or particles with the particle diameter ?0.074 mm, and its particles have irregular shape.

Abstract: The present invention discloses a transparent frozen soil, which is prepared from a fluorine-containing polymer, cube ice and a colorless pore fluid by steps of preparing materials, blending, vacuuming, and freezing. The fluorine-containing polymer is Teflon AF 1600 produced by American DuPont Company, with the refractive index of 1.31, and are particles with the particle diameter of 0.25-2.0 mm, and the density of 2.1-2.3 g/cm3. The present invention also provides the application of the above transparent frozen soil in the frozen soil directional blasting model test and the frozen soil road embankment model thaw-slumping test. The transparent frozen soil prepared by the present invention can well simulate the properties of natural transparent frozen sandy soil, is effectively used in model tests in the geotechnical engineering, with accurate measurement results, and can realize the visualization of the internal deformation of the soil body, and it is low in the expense, and simple in the operation.