Soil body slip-off type fracture test method based on magnetic levitation effect
A fracture test and magnetic levitation technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of no control group, influence, and inconvenient comparison of test results, etc., and achieve the effects of improving accuracy, wide application, and eliminating friction
Active Publication Date: 2020-07-10
HOHAI UNIV
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Problems solved by technology
In the actual test, the friction between the backing plate and the slide rail may affect the test results, so this method needs to be improved
[0006] 2. The size of the soil sample is fixed, and the influence of the size of the soil sample and the change of the initial crack size on the fracture toughness of the soil sample cannot be considered
[0007] 3. Only one crack can be tested and studied, but the type II fracture test cannot be tested twice on the same soil sample, so there is no control group, which is inconvenient to compare test results
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[0046] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific preferred embodiments.
[0047]In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "left side", "right side", "upper", "lower" are based on the orientations or positional relationships shown in the accompanying drawings, and are only For the purpose of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, "first", "second" and the like do not represent components importance, and therefore should not be construed as limiting the invention. The specific dimensions used in this embodiment are only for illustrating the technical solution, and do not limit the protection scope of the present inv...
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The invention discloses a soil body slip-off type fracture test method based on a magnetic levitation effect. The method comprises the following steps: step 1, preparing a sample; step 2, assembling amagnetic levitation device; step 3, performing interval gap adjustment; by adjusting the current introduced into the two horizontal electromagnetic coils in the magnetic levitation platforms, the interval gap between every two adjacent magnetic levitation platforms being equal to the width of the prefabricated crack; step 4, placing a sample and electrifying: after placing the sample, introducingthe same current into two vertical electromagnetic coils in the three magnetic levitation platforms, so that the three magnetic levitation platforms drive the sample to synchronously rise to a levitation state; step 5, clamping the sample; step 6, carrying out a II-type fracture test; step 7, data acquisition and drawing; step 8, stopping the test. The magnetic suspension platform is completely separated from the test platform, the friction force is eliminated, and the test accuracy is improved. In addition, by adjusting the length and width of the sample or the size of the prefabricated crack, the influence of the sample size and the initial crack size change on the fracture toughness of the sample is found.
Description
technical field [0001] The invention relates to a soil engineering test method, in particular to a soil sliding type fracture test method based on the magnetic levitation effect. Background technique [0002] Fracture is a failure process caused by the initiation of new cracks or the expansion of existing cracks, and is one of the failure modes of materials and structures. In fracture mechanics, crack propagation can be divided into three basic types according to its stress state, namely: opening type (that is, type I), sliding type (that is, type II) and tearing type (that is, type III ), respectively as figure 1 shown. In soil mass fracture damage, two types of fractures, type I and type II, are mainly involved, and the invention is mainly applicable to the research of pure type II fractures. [0003] The Chinese invention patent with the application number CN201210518436.0, the title of the invention is "Soil shear fracture failure test device and method", including a ...
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IPC IPC(8): G01N3/00G01N3/02
CPCG01N3/00G01N3/02
Inventor 孙一清沈振中甘磊徐力群王润英张宏伟张开来张文兵杨金孟王梓优刘杰卿杨子桐林文
Owner HOHAI UNIV