A kind of nscb sample preparation device for testing the i-mode fracture toughness of compacted clay and its application method
A fracture toughness and sample preparation technology, which is applied in the preparation of test samples, measuring devices, sampling, etc., can solve the problems of high tensile strength, difficult control of sample quality, and difficult prefabrication of cracks, etc.
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Embodiment 1
[0046] This embodiment discloses an NSCB sample preparation device for testing the mode I fracture toughness of compacted clay, including a sample preparation container and a compactor.
[0047] see Figure 6 , the sample preparation container includes a container side baffle I5, a container side baffle II6, a crack prefabricated spacer 7, a container base 8 and a container constraint frame 11.
[0048] see Figure 10 , the cracked prefabricated spacer 7 includes vertical plates I 701 and vertical plates II 702 perpendicular to each other. The size of the vertical plate I 701 is selected according to the slit length of the sample required for the experiment. Four pin holes II7021 are provided on the surface of the vertical plate II702. The pin hole II7021 runs through the surface of the vertical plate II702.
[0049] see Figure 9 , the container base 8 includes a bottom plate 801 and a frame body flange 802 disposed on the upper surface of the bottom plate 801 . The bot...
Embodiment 2
[0057] This embodiment discloses a method for using the preparation device described in Embodiment 1, comprising the following steps:
[0058] 1) Select the corresponding crack prefabricated spacer 7 according to the requirement of the sample opening length.
[0059] 2) Coat the inner wall of the semicircular box and the vertical plate I701 with Vaseline or lubricating oil to prevent the soil sample from sticking to the device during sample disassembly. Install the sample container.
[0060] 3) Select the crack block cap 4 according to the size of the vertical plate I701, and install the compactor.
[0061] 4) Configure the soil material according to the test requirements, and divide the soil material into at least 3 parts.
[0062] 5) Put 1 portion of soil material into the sample preparation container. Extend the compaction plate 3 into the sample preparation container. The vertical plate I 701 passes through the bar-shaped sliding slot 4011 .
[0063] 6) Use the compac...
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