CN113720668B - Device for manufacturing frozen soil dynamic fracture toughness sample - Google Patents
Device for manufacturing frozen soil dynamic fracture toughness sample Download PDFInfo
- Publication number
- CN113720668B CN113720668B CN202111108475.9A CN202111108475A CN113720668B CN 113720668 B CN113720668 B CN 113720668B CN 202111108475 A CN202111108475 A CN 202111108475A CN 113720668 B CN113720668 B CN 113720668B
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- CN
- China
- Prior art keywords
- frost heaving
- limiting plate
- frozen soil
- control film
- upper cover
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- 239000002689 soil Substances 0.000 title claims abstract description 46
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000007789 sealing Methods 0.000 claims abstract description 12
- 238000002360 preparation method Methods 0.000 claims abstract description 11
- 230000008014 freezing Effects 0.000 description 7
- 238000007710 freezing Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 238000007656 fracture toughness test Methods 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/42—Low-temperature sample treatment, e.g. cryofixation
Abstract
The invention relates to a device for manufacturing frozen soil dynamic fracture toughness samples, which consists of an upper cover, a lower cover and a sample preparation main body, wherein the upper cover and the lower cover are completely identical in structure, and are provided with a cold source, a sealing ring, a groove, a sealing ring groove and a bolt hole; the sample preparation main body is provided with a frozen soil sample groove, a frozen expansion control film, a frozen expansion limiting plate, a water inlet and a bolt hole; the upper end and the lower end of the frost heaving limiting plate can be fixed in the grooves of the upper cover and the lower cover, the front end of the frost heaving limiting plate is provided with an opening, and the rear end of the frost heaving limiting plate is connected with the water inlet; the frost heaving control film is arranged at the front end of the frost heaving limiting plate, and the invention has the characteristics of simple structure, convenient operation and the like.
Description
Technical Field
The invention relates to the field of frozen soil mechanics research, in particular to a device for manufacturing a frozen soil dynamic fracture toughness sample.
Background
The dynamic fracture toughness is an important parameter for evaluating the dynamic mechanical property index of the material, and can characterize the capability of the material for resisting crack initiation, crack propagation and fracture damage under the action of dynamic impact load. In the frozen soil Split Hopkinson Pressure Bar (SHPB) impact test, it is necessary to prepare a suitable test piece to test its dynamic fracture toughness.
In conventional SHPB tests, a straight cut groove semicircular bend (NSCB) specimen is typically used to test the dynamic fracture toughness of a material, the shape of the specimen is shown in fig. 1. For rock or concrete type materials, the following methods are generally used for sample preparation: the method comprises the steps of coring, cutting and polishing, preparing rock or concrete into a standard disc sample, then cutting for the second time, preparing a semi-disc sample preliminarily, and finally grooving the center of the semi-disc sample by adopting water jet or other grooving technologies to prepare the NSCB sample required by the rock or concrete material.
For frozen soil granular materials, a mould required for preparing an NSCB test piece is usually processed in advance, unfrozen soil is placed in the mould, after the unfrozen soil is compacted layer by layer, the surface is smoothed, the frozen soil and the mould are placed in a low-temperature box, after the required freezing time is reached, the mould is removed, and the NSCB test piece of frozen soil can be prepared. Research shows that for natural frozen soil, in the formation process, two types of cracks are mainly formed, wherein one type of cracks is caused by the action of external load, namely load cracks; secondly, because the soil body is frozen in the process, the water ice phase change expansion causes cracks, the principle is that a plurality of microcracks exist in the frozen soil, unfrozen water exists in the frozen soil, when the unfrozen water is frozen into ice, when the freezing expansion force exceeds the tensile strength of the frozen soil, the tips of the microcracks can generate pulling cracks, namely frost heaving cracks. However, if the manufacturing method of the frozen soil NSCB sample is adopted, the prepared frozen soil sample crack, especially the crack tip, is caused by a manual reserved groove, and is different from the principle that the micro crack tip is an expansion pull crack when an actual soil body is frozen, namely the frozen soil dynamic fracture toughness sample with the crack tip being a frost expansion crack cannot be prepared.
In view of the above, it is desirable to invent an apparatus for producing a frozen soil dynamic fracture toughness test sample for achieving the purpose of producing a frozen soil dynamic fracture toughness test sample in which the crack tip is a frost heaving crack.
Disclosure of Invention
The invention aims to provide a device for manufacturing a frozen soil dynamic fracture toughness sample, by using the device, a frozen soil NSCB sample with a crack tip being a frost heaving crack can be prepared in a laboratory. The invention has the characteristics of simple structure, convenient operation and the like.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
a device for manufacturing frozen soil dynamic fracture toughness samples consists of an upper cover, a lower cover and a sample preparation main body. The upper cover and the lower cover are completely identical in structure, and are provided with a cold source, a sealing ring, a groove, a sealing ring groove and a bolt hole; the sample preparation main body is provided with a frozen soil sample groove, a frozen expansion control film, a frozen expansion limiting plate, a water inlet and a bolt hole; the upper end and the lower end of the frost heaving limiting plate can be fixed in the grooves of the upper cover and the lower cover, the front end of the frost heaving limiting plate is provided with an opening, and the rear end of the frost heaving limiting plate is connected with the water inlet; the frost heaving control film is arranged at the front end of the frost heaving limiting plate, and the upper end and the lower end of the frost heaving control film can be fixed in the grooves of the upper cover and the lower cover.
In the above device, water cannot pass through the frost heaving control film, but the frost heaving force generated when water freezes into ice can exceed the ultimate tensile strength of the frost heaving control film.
In the device, the width of the opening at the front end of the frost heaving limiting plate is 0.5mm.
Compared with the prior art, the invention has the beneficial effects that:
by arranging the frozen soil sample groove, a semicircular frozen soil test piece with a prefabricated crack can be manufactured; by arranging the frost heaving control film and the frost heaving limiting plate, water in the frost heaving limiting plate can generate frost heaving cracks when the frost heaving force of the tip of the prefabricated crack (namely the front end of the frost heaving limiting plate) exceeds the ultimate tensile strength of the frost heaving control film in the freezing process, and the cracks gradually expand along with the progress of freezing, so that the purpose of manufacturing a frozen soil dynamic fracture toughness sample with the tip of the crack being the frost heaving crack is realized.
Drawings
Fig. 1 is a schematic representation of a straight slit semicircular curved (NSCB) specimen.
FIG. 2 is a schematic diagram of the front structure of an apparatus for producing frozen soil dynamic fracture toughness samples according to the present invention.
FIG. 3 is a schematic side view of an apparatus for making frozen soil dynamic fracture toughness samples according to the present invention.
FIG. 4 is a schematic structural view of a frost heaving control film and frost heaving restriction plate of the apparatus of the present invention.
The reference numerals in the figures illustrate: 1-upper cover, 2-lower cover, 3-cold source, 4-sealing ring, 5-groove, 6-sealing ring groove, 7-bolt hole, 8-sample preparation main body, 9-frozen soil sample groove, 10-frost heaving control film, 11-frost heaving limiting plate and 12-water inlet.
Detailed Description
The present patent will be described in further detail below with reference to the attached drawings and specific embodiments, wherein it is apparent that the described embodiments are only some embodiments, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples:
fig. 2 to 4 show an apparatus for manufacturing a frozen soil dynamic fracture toughness sample, which comprises an upper cover 1, a lower cover 2 and a sample preparation main body 8. The structure of the upper cover 1 and the structure of the lower cover 2 are identical, and the upper cover 1 and the lower cover 2 are provided with a cold source 3, a sealing ring 4, a groove 5, a sealing ring groove 6 and a bolt hole 7; the sample preparation main body 8 is provided with a frozen soil sample groove 9, a frozen expansion control film 10, a frozen expansion limiting plate 11, a water inlet 12 and a bolt hole 7; the upper end and the lower end of the frost heaving limiting plate 11 can be fixed in the grooves 5 of the upper cover 1 and the lower cover 2, the front end of the frost heaving limiting plate 11 is provided with an opening, and the rear end of the frost heaving limiting plate 11 is connected with the water inlet 12; the frost heaving control film 10 is disposed at the front end of the frost heaving restriction plate 11, and the upper and lower ends of the frost heaving control film 10 may be fixed in the grooves 5 of the upper and lower covers 1 and 2.
The procedure for preparing the frozen soil dynamic fracture toughness test sample is as follows:
firstly, preparing a test soil sample, and mixing the test soil sample to the required water content;
secondly, the sealing rings 4 are arranged in the sealing ring grooves 6 in the upper cover 1 and the lower cover 2;
thirdly, fixing the frost heaving control film 10 and the frost heaving limiting plate 11 in the groove 5 of the lower cover 2, covering the lower cover, adding the mixed soil sample into the frost soil sample groove 9, compacting in layers, aligning the groove 5 in the upper cover 1 with the frost heaving control film 10 and the frost heaving limiting plate 11, and covering the upper cover;
fourthly, water is injected into the water inlet 12, so that the space in the frost heaving limit plate 11 is filled with water, and then the water inlet 12 is blocked by using a cover;
fifthly, opening cold sources 3 positioned on the upper cover 1 and the lower cover 2 to freeze water positioned in the frost heaving limiting plate 11, wherein stress concentration is formed at the front end opening of the frost heaving limiting plate 11 due to the fact that the opening is narrow, so that frost heaving force is large at the position, when the frost heaving force exceeds the ultimate tensile strength of the frost heaving control film 10, the frost heaving control film 10 is torn, frost heaving cracks are generated at the moment, and the frost heaving cracks are gradually expanded and finally terminated along with the gradual increase of the frost heaving force;
and sixthly, gradually freezing the soil sample in the frozen soil sample tank 9 along with the increase of the freezing time, opening the upper cover 1 and the lower cover 2 after the set freezing time is reached, and taking out the manufactured frozen soil sample to manufacture the frozen soil dynamic fracture toughness sample with the crack tip being the frost heaving crack.
Claims (1)
1. The device for manufacturing the frozen soil dynamic fracture toughness sample comprises an upper cover (1), a lower cover (2) and a sample preparation main body (8), wherein the sample preparation main body (8) is arranged between the upper cover (1) and the lower cover (2), the upper cover (1) and the lower cover (2) are completely identical in structure, and both the upper cover (1) and the lower cover (2) are provided with a cold source (3), a sealing ring (4), a groove (5), a sealing ring groove (6) and a bolt hole (7); the sample preparation main body (8) is provided with a frozen soil sample groove (9), a frozen expansion control film (10), a frozen expansion limiting plate (11), a water inlet (12) and a bolt hole (7); the upper end and the lower end of the frost heaving limiting plate (11) can be fixed in the grooves (5) of the upper cover (1) and the lower cover (2), the front end of the frost heaving limiting plate (11) is provided with an opening, and the rear end of the frost heaving limiting plate (11) is connected with the water inlet (12); the frost heaving control film (10) is arranged at the front end of the frost heaving limiting plate (11), and the upper end and the lower end of the frost heaving control film (10) can be fixed in the grooves (5) of the upper cover (1) and the lower cover (2); water cannot pass through the frost heaving control film (10), but the frost heaving force generated when the water freezes into ice can exceed the ultimate tensile strength of the frost heaving control film (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111108475.9A CN113720668B (en) | 2021-09-22 | 2021-09-22 | Device for manufacturing frozen soil dynamic fracture toughness sample |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111108475.9A CN113720668B (en) | 2021-09-22 | 2021-09-22 | Device for manufacturing frozen soil dynamic fracture toughness sample |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113720668A CN113720668A (en) | 2021-11-30 |
| CN113720668B true CN113720668B (en) | 2024-02-13 |
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| CN202111108475.9A Active CN113720668B (en) | 2021-09-22 | 2021-09-22 | Device for manufacturing frozen soil dynamic fracture toughness sample |
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