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NSCB (notched semi-circular bend) specimen preparation device for testing I-type fracture toughness of compacted clay and use method thereof

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 easily damaged samples, difficult prefabrication of cracks, and difficult control of sample quality

Active Publication Date: 2019-03-12
CHONGQING JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high cohesive force and low tensile strength of compacted clay, the prefabrication of cracks in compacted clay by cutting will greatly disturb the sample, and it is easy to damage the sample. Compacted clay, the cutting method disturbs the specimen more
In summary, none of the previous crack prefabrication methods could prepare a complete NSCB compacted clay sample, which made it difficult to prefabricate cracks and control the quality of the samples.

Method used

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  • NSCB (notched semi-circular bend) specimen preparation device for testing I-type fracture toughness of compacted clay and use method thereof
  • NSCB (notched semi-circular bend) specimen preparation device for testing I-type fracture toughness of compacted clay and use method thereof
  • NSCB (notched semi-circular bend) specimen preparation device for testing I-type fracture toughness of compacted clay and use method thereof

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention provides an NSCB (notched semi-circular bend) specimen preparation device for testing I-type fracture toughness of compacted clay and a use method thereof. The device comprises a specimen-making container and a compacting device, wherein the specimen-making container comprises a container side edge baffle plate I, a container side edge baffle plate II, a crack precast cushion block,a container base and a container bounding framework; the compacting device comprises a compacting rod, a compacting hammer, a compacting plate and a crack cushion block cap. During testing, an earth material is put in the specimen-making container, and the compacting plate stretches into the specimen-making container. The use method of the device comprises the steps of selecting the crack precastcushion block, installing the specimen-making container, preparing the earth material, performing cyclical compacting and the like. By adopting the device, the preparation of the NSCB specimen can berealized, a crack can be precast without generating disturbance to the specimen, so that the integrity of the specimen is guaranteed and the crack is enabled to be uniform.

Description

technical field [0001] The invention relates to the field of civil engineering test instruments, in particular to an NSCB sample preparation device for testing the I-mode fracture toughness of compacted clay. Background technique [0002] Cracks are common hidden dangers and one of the main causes of damage in various geotechnical structures. Such as ground fissures caused by groundwater exploitation, hydraulic splitting of the core wall of earth-rock dams, and tension cracks at the top of the clay slope before it becomes unstable. Once the cracks expand, huge disasters will be caused. These problems are related to the clay related to crack resistance. Fracture refers to the failure of materials caused by crack propagation, and the failure of clay due to crack propagation is a fracture problem. The application of the theory and method of fracture mechanics has made a fundamental development in the study of problems related to clay fracture, which can consider the stress si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28
CPCG01N1/286
Inventor 邱珍锋黄诗渊王俊杰靳松洋陈祥彬
Owner CHONGQING JIAOTONG UNIVERSITY
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