Frozen soil freezing and thawing cycle SHPB test equipment under stress state and test method thereof
A freeze-thaw cycle and stress state technology, which is used in the preparation of test samples, the use of a single impact force to test the strength of materials, and the use of stable tension/pressure to test the strength of materials, etc. question
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Embodiment 1
[0036] see figure 1 , the present embodiment discloses freeze-thaw cycle SHPB test equipment for frozen soil under stress state, including freeze-thaw cycle sample preparation system, SHPB test system and data acquisition system.
[0037] see figure 2 , the freeze-thaw cycle sample preparation system includes a freeze-thaw cycler 1 , a freeze-thaw box 4 and a soil placement frame 5 . The freeze-thaw box 4 is a rectangular box with a top cover. The four side walls of the rectangular box are sequentially the first side wall, the second side wall, the third side wall and the fourth side wall. A liquid nitrogen cooling chamber 401 is enclosed in the first side wall and the third side wall. Both the first side wall and the third side wall are provided with a liquid nitrogen injection port 403 and a liquid nitrogen output port 404 . The liquid nitrogen injection port 403 and the liquid nitrogen output port 404 communicate with the outside of the freeze-thaw box 4 and the liquid...
Embodiment 2
[0042] A kind of test method about permafrost freeze-thaw cycle SHPB test equipment under the stress state described in embodiment 1, comprises the following steps:
[0043] 1) According to the test requirements, mix the soil material according to a certain gradation and density, add a certain amount of water and stir thoroughly, and seal it for 12 hours to make the soil particles and water evenly mixed.
[0044] 2) Apply a layer of butter on the inner wall of the soil storage chamber S, so as to make the soil particles and the inner wall contact and lubricate.
[0045] 3) Divide the soil materials into three equal parts into the soil placement chamber S, compact them in layers, and ensure that the bottom layer of soil is planed before compacting each layer of soil to ensure good contact between soil layers . Wherein, a temperature sensor is installed in the soil storage chamber S.
[0046] 4) Turn on the freeze-thaw cycler 1 to realize the freeze-thaw cycle of the soil, and...
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