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A triaxial creep, low temperature technology, applied in the direction of applying stable tension/pressure to test the strength of materials, can solve the problems of imperfect frozen soil creep test and other problems, and achieve the effect of stable air pressure, convenient movement and time saving
Inactive Publication Date: 2015-05-20
HARBIN INST OF TECH
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[0004] The purpose of the present invention is to provide a single low temperature low confining pressure triaxial creep instrument to solve the current imperfect creep test of frozen soil under small stress and small confining pressure
Method used
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specific Embodiment approach 1
[0009] Specific implementation mode one: combine figure 1 Describe this embodiment, the creep instrument of this embodiment includes reaction force frame 2, magnetic base 3, displacement sensor 4, stainless steel plate 5, cylinder 6, cylinder dowel 7, axial pressure pipeline 8, axial pressure regulator 9, Confining pressure pipeline 10, confining pressure regulator 11, air pressure stabilization source 12, cooling bath input pipe 13, temperature sensor 14, axial load sensor 15, cooling bath output pipe 16, incubator 18, pressure chamber 19, sample cap 20 , permeable stone 22, double helix copper pipe 24, confining pressure sensor 28, base 29, automatic data acquisition system 30, automatic temperature control system 31 and two threaded rods 1, threaded rods 1 are fixed on the base 29 to adjust the reaction force The height of the frame 2, the lower part of the reaction force frame 2 is fixed with the cylinder 6, the lower part of the cylinder dowel 7 is fixed with an axial loa...
specific Embodiment approach 2
[0012] Specific implementation mode two: combination figure 1 Explain that the creep meter in this embodiment also includes an air pressure stabilization source 12 for providing axial pressure and confining pressure. Creep test under pressure. Other implementation manners are the same as the specific implementation manner 1.
specific Embodiment approach 3
[0013] Specific implementation mode three: combination figure 1 Note that the creep instrument in this embodiment also includes a pressure chamber 19, the inner wall of the external incubator 18 is made of rigid polyurethane insulation board, and the inner wall thickness of the incubator 8 is 80 mm. The advantage of this structure is that the thermal conductivity of rigid polyurethane material is low, and it has excellent thermal insulation performance in the current thermal insulation materials. Under the same thermal insulation requirements, the thickness of rigid polyurethane thermal insulation board can be reduced and the effective use area can be increased. Other implementation manners are the same as the specific implementation manner 1.
[0014] working principle:
[0015] Put the pressure chamber 19 and the double-helix copper tube 24 into an environment box identical to the test temperature for precooling for 2 hours, then take out the pre-cooled pressure chamber 19 ...
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Abstract
The invention discloses a single-linked low-temperature low-confining-pressure triaxial creep testing apparatus, and relates to the field of civil engineering material testing instruments. By adopting the creep testing apparatus, the problem of imperfect frozen soil creep tests under small stress and small confining pressure at present can be solved. A technical scheme adopted by the single-linked low-temperature low-confining-pressure triaxial creep testing apparatus is as follows: the single-linked low-temperature low-confining-pressure triaxial creep testing apparatus mainly comprises a host, a pressure chamber, a pneumatic servo system, an automatic data acquisition system and an automatic temperature control system, wherein a gas cylinder is fixedly arranged at the lower part of a reaction frame of the host, an axial load sensor is fixedly arranged at the lower part of a force transfer rod of the gas cylinder, a displacement sensor is fixedly arranged between the reaction frame and the gas cylinder, a double-helical copper pipe connected with the automatic temperature control system is arranged inside the pressure chamber, a temperature sensor is arranged on a top cover of the pressure chamber, the axial pressure and confining pressure of the pressure chamber are controlled by an axial pressure regulator and a confining pressure regulator of the pneumatic servo system, a confining pressure sensor is arranged at a confining pressure pipeline at the bottom end of the pressure chamber, and a heat preservation tank is arranged at the outer part of the pressure chamber. The single-linked low-temperature low-confining-pressure triaxial creep testing apparatus disclosed by the invention can be applied to uniaxial or triaxial creep tests of frozen soil under low temperature and low confining pressure and uniaxial or triaxial creep tests under normal temperature and low confining pressure.
Description
technical field [0001] The invention relates to a single-connected low-temperature, low-confining-pressure triaxial creep instrument, and relates to the field of civil engineering material testing instruments. Background technique [0002] my country's permafrost area ranks third in the world, of which the permafrost area is about 2.15 million square kilometers. With the rapid development of the economy, more and more engineering projects are being carried out in permafrost regions. In solving a series of engineering problems such as subgrade engineering and building foundation stability in cold regions, it is more and more urgent to understand the mechanical properties of permafrost. Especially under the combined effect of external load and environmental temperature rise, the creep deformation characteristics of ordinary frozen soil, high temperature frozen soil and high ice content frozen soil caused the settlement deformation of engineering structures, which led to the co...
Claims
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