CN113008635A - Preparation method of shear sample containing filled through single fracture - Google Patents
Preparation method of shear sample containing filled through single fracture Download PDFInfo
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- CN113008635A CN113008635A CN201911321475.XA CN201911321475A CN113008635A CN 113008635 A CN113008635 A CN 113008635A CN 201911321475 A CN201911321475 A CN 201911321475A CN 113008635 A CN113008635 A CN 113008635A
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- 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
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Abstract
The invention discloses a preparation method of a cut sample containing filled through single cracks, which comprises the steps of collecting the roughness and the opening degree of the single cracks, and establishing a 3D virtual model of a cut sample mold containing the through single cracks; printing the outline of the 3D virtual model and the through single crack to obtain a sample preparation mold; smearing lubricating oil inside the sample preparation mold for 1-2 times; pouring cement mortar into the sample preparation mold and fully vibrating; after the cement mortar is cured and formed, placing the mortar sample and the sample preparation mold into water for curing for 28 days, and penetrating through the single crack to dissolve in the water to form a gap; after the mortar sample and the sample preparation mold are dried, filling materials are injected along the gap where the through single crack is located; putting the well-filled mortar sample and the sample preparation mold into an oven to be heated for a period of time; and taking out the sample, placing the sample in a shade place, and waiting for natural cooling to obtain a shear sample containing the filled through single crack. The method can accurately control the roughness and the opening degree of the crack, and the preparation method of the model is simple and convenient.
Description
Technical Field
The invention relates to the technical field of rock mechanics and engineering, in particular to a preparation method of a filled cut sample penetrating through a single fracture.
Background
In rock masses there are a large number of structural planes, which are weak parts of the rock mass, and the strength of the rock mass is controlled by the strength of the structural planes. Fillers are often found in natural regulations and range in thickness from a few millimeters to tens of millimeters. In the case of a rock mass containing a packing joint, the mechanical properties of the rock mass are controlled by the structural surface roughness, the mechanical properties of the packing material and the thickness of the packing. Under the natural stress state, the damage of rock mass structures such as tunnels, dam foundations, roadways and the like is mostly the shearing damage along the joint surface. Therefore, the research on the shear mechanical property of the filling joint has important significance for analyzing the stability of the rock mass.
Particular problems are often encountered when making shear samples containing filled through single fractures in a chamber. Such as: how to control the opening of the joint; how to control the roughness of the joint; how the filling is done enables the filling to be distributed inside the structural surface without spilling out of the structural surface. The determination of these details determines whether the test is successful or not.
Disclosure of Invention
In order to overcome the defect that the prior art cannot effectively manufacture the shear sample containing the filled through single fracture, the invention provides the preparation method of the shear sample containing the filled through single fracture, which has the advantages of simple principle, convenient operation and good forming effect and can fully consider the roughness and the opening degree of the rock mass fracture.
The invention provides a preparation method of a shear sample containing a filled through single fracture, which comprises the following specific steps:
s1, acquiring the roughness and the opening degree of the single crack, and establishing a 3D virtual model of the shear sample mold with the single crack in a penetrating mode according to the roughness and the opening degree;
s2, 3D printing the outline of the 3D virtual model by adopting a hot-melt material, and 3D printing a through single crack of the 3D virtual model by adopting a water-soluble material to obtain a sample preparation mold;
s3, smearing lubricating oil in the sample preparation mold for 1-2 times;
s4, pouring cement mortar into the sample preparation mold and fully vibrating;
s5, after the cement mortar is cured and formed for 24 hours, putting the mortar sample and the sample preparation mold into water for curing for 28 days, and penetrating through the single crack to dissolve in the water to form a gap;
and S6, after the maintenance is finished, taking out the mortar sample and the sample preparation mold from the water, and standing for a period of time. After the mortar sample and the sample preparation mold are dried, filling materials are injected along the gap where the through single crack is located;
s7, putting the filled mortar sample and the sample preparation mold into an oven to be heated for a period of time; under the heating condition, melting a sample preparation mold printed by the hot-melt material;
and S8, taking out the sample, placing the sample in a shade place, and waiting for natural cooling to obtain the shear sample containing the filled through single crack.
In step S2, the hot melt material is polylactic acid, and the hot melt material is insoluble in water.
In step S2, the water-soluble material is impact-resistant polystyrene.
In step S6, the filler substance is an epoxy resin.
The cut sample containing the filled through single fracture is a neat cube with a length to width ratio of 1:1 and a length to height ratio of 1: 2.
The invention has the beneficial effects that:
(1) according to the invention, the 3D printing technology is adopted to prepare the cut sample containing the filled through single crack, so that the roughness and the opening degree of the crack can be accurately controlled;
(2) according to the invention, the water-soluble material is used for forming the crack structure of the sample, and after the cement mortar sample is soaked, the water-soluble material is dissolved, so that the required crack can be obtained, the crack structure can be well protected, and the uncontrollable damage to the interior of the rock mass sample during demoulding in the traditional technology is avoided;
(3) the filling is carried out at the crack in the sample preparation mould, so that the filling material is ensured to be distributed in the through single crack and cannot overflow out of the through single crack;
(4) the invention obtains the prepared sample by heating the filled mortar sample and the sample preparation mould and melting the sample preparation mould. The demoulding is convenient and fast, the shape and the size of the crack can not be damaged, and the new crack is not generated around the crack.
Drawings
FIG. 1 is a flow chart of the present invention;
fig. 2 is a schematic structural diagram of a sample preparation mold in an embodiment of the present invention.
In the figure: 1-contours of the 3D virtual model; 2-through single slit.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 1 and 2, the method for preparing a shear sample containing a filled single through-crack of the present invention comprises the following steps:
s1, acquiring the roughness and the opening degree of the single crack, and establishing a 3D virtual model of the shear sample mold with the single crack in a penetrating mode according to the roughness and the opening degree;
s2, printing the outline 1 of the 3D virtual model by adopting a hot-melt material 3D, and printing the run-through single crack 2 of the 3D virtual model by adopting a water-soluble material 3D to obtain a sample preparation mold; the hot melt material is polylactic acid, and is insoluble in water; the water-soluble material is impact-resistant polystyrene;
s3, smearing lubricating oil in the sample preparation mold for 1-2 times;
s4, pouring cement mortar into the sample preparation mold and fully vibrating;
s5, after the cement mortar is cured and formed for 24 hours, putting the mortar sample and the sample preparation mold into water for curing for 28 days, and penetrating the single crack 2 to dissolve in the water to form a gap;
and S6, after the maintenance is finished, taking out the mortar sample and the sample preparation mold from the water, and standing for a period of time. After the mortar sample and the sample preparation mold are dried, injecting epoxy resin along the gap where the through single crack is located;
s7, putting the filled mortar sample and the sample preparation mold into an oven to be heated for a period of time; under the heating condition, melting a sample preparation mold printed by the hot-melt material;
s8, taking out the sample, placing the sample in a shade place, and waiting for natural cooling to obtain a shear sample containing the filled through single cracks; the cut sample containing the filled through single fracture is a neat cube with a length to width ratio of 1:1 and a length to height ratio of 1: 2.
Examples
Preparing a cut sample containing filled through single cracks, wherein the opening degree of the through cracks is 2mm, the roughness is 0, the position of the cut sample is the center of a rock-like sample, the length, the width and the height of the rock-like sample are respectively 50mm, 50mm and 100mm, and the specific implementation steps are as follows:
s1, establishing a 3D virtual model of the cut sample mold which penetrates through the single crack and has the opening degree of 2mm and the roughness of 0 through AtuoCAD modeling, wherein the model is a cube with the length, the width and the height of 50mm, 50mm and 100mm respectively, as shown in figure 2.
S2, preparing raw materials: placing a hot melt material polylactic acid in a first print head; placing water-soluble material impact-resistant polystyrene in a second printing nozzle; inputting the 3D virtual model constructed in the step one into the 3D printer, and simultaneously printing the outline 1 and the run-through single crack 2 of the 3D virtual model by two spray heads of the printer to obtain a sample preparation mold.
And S3, coating lubricating oil in the sample preparation mold for 1-2 times.
And S4, pouring cement mortar into the sample preparation mould and fully vibrating. In this embodiment, the cement mortar mixing ratio is cement: quartz sand: water is 1:2:0.45, and the specification of cement is P.C 32.5.
And S5, after the cement mortar is cured and molded for 24 hours, soaking the mortar sample and the sample preparation mold in water, dissolving the soluble material to form a sample crack, and curing the sample for 28 days.
And S6, after the maintenance is finished, taking out the mortar sample and the sample preparation mold from the water, and standing for a period of time. And after the mortar sample and the sample preparation mold are dried, injecting epoxy resin along the through single crack.
And S7, putting the filled mortar sample and the initial mold into an oven for heating for a period of time, and melting the sample preparation mold printed by the hot melt material under the heating condition.
And S8, taking out the sample, placing the sample in a shade place, and waiting for natural cooling to obtain the shear sample containing the filled through single crack.
Descriptions not related to the embodiments of the present invention are well known in the art, and may be implemented by referring to the well-known techniques.
The invention obtains satisfactory trial effect through repeated test verification.
The above embodiments are described in connection with the accompanying drawings, but the present invention is not limited thereto, and it should be noted that, for those skilled in the art, the technical solutions obtained by equivalent replacement or equivalent change without departing from the spirit of the present invention, and all of them belong to the protection scope of the present invention.
Claims (5)
1. A preparation method of a shear sample containing a filled through single crack is characterized by comprising the following steps: it comprises the following steps:
s1, acquiring the roughness and the opening degree of the single crack, and establishing a 3D virtual model of the shear sample mold with the single crack in a penetrating mode according to the roughness and the opening degree;
s2, 3D printing the outline of the 3D virtual model by adopting a hot-melt material, and 3D printing a through single crack of the 3D virtual model by adopting a water-soluble material to obtain a sample preparation mold;
s3, smearing lubricating oil in the sample preparation mold for 1-2 times;
s4, pouring cement mortar into the sample preparation mold and fully vibrating;
s5, after the cement mortar is cured and formed for 24 hours, putting the mortar sample and the sample preparation mold into water for curing for 28 days, and penetrating through the single crack to dissolve in the water to form a gap;
s6, after the maintenance is finished, taking out the mortar sample and the sample preparation mold from the water, and standing for a period of time; after the mortar sample and the sample preparation mold are dried, filling materials are injected along the gap where the through single crack is located;
s7, putting the filled mortar sample and the sample preparation mold into an oven to be heated for a period of time; under the heating condition, melting a sample preparation mold printed by the hot-melt material;
and S8, taking out the sample, placing the sample in a shade place, and waiting for natural cooling to obtain the shear sample containing the filled through single crack.
2. The method of preparing a shear specimen containing a packed single fracture therethrough of claim 1, wherein: in step S2, the hot melt material is polylactic acid, and the hot melt material is insoluble in water.
3. The method of preparing a shear specimen containing a packed single fracture therethrough of claim 1, wherein: in step S2, the water-soluble material is impact-resistant polystyrene.
4. The method of preparing a shear specimen containing a packed single fracture therethrough of claim 1, wherein: in step S6, the filling material is epoxy resin.
5. The method of preparing a shear specimen containing a packed single fracture therethrough of claim 1, wherein: the cut sample containing the filled through single fracture is a cube, the ratio of the length to the width of the cube is 1:1, and the ratio of the length to the height is 1: 2.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117030383A (en) * | 2023-07-18 | 2023-11-10 | 北京科技大学 | Goaf similarity test model manufacturing device and goaf similarity test model manufacturing method |
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| US20170008085A1 (en) * | 2014-06-19 | 2017-01-12 | Halliburton Energy Services, Inc. | Forming Facsimile Formation Core Samples Using Three-Dimensional Printing |
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