CN114354305A - Method for manufacturing curved surface type joint in rock sample - Google Patents
Method for manufacturing curved surface type joint in rock sample Download PDFInfo
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- CN114354305A CN114354305A CN202111500583.0A CN202111500583A CN114354305A CN 114354305 A CN114354305 A CN 114354305A CN 202111500583 A CN202111500583 A CN 202111500583A CN 114354305 A CN114354305 A CN 114354305A
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- 239000011435 rock Substances 0.000 title claims abstract description 111
- 238000000034 method Methods 0.000 title claims abstract description 52
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000012360 testing method Methods 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 13
- 238000005553 drilling Methods 0.000 claims abstract description 11
- 238000000227 grinding Methods 0.000 claims abstract description 8
- 238000005520 cutting process Methods 0.000 claims description 29
- 239000010440 gypsum Substances 0.000 claims description 5
- 229910052602 gypsum Inorganic materials 0.000 claims description 5
- 238000005498 polishing Methods 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 5
- 238000011049 filling Methods 0.000 claims description 4
- 238000007639 printing Methods 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 3
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- 238000011160 research Methods 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
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- 238000005516 engineering process Methods 0.000 description 3
- 230000000149 penetrating effect Effects 0.000 description 3
- 238000010146 3D printing Methods 0.000 description 2
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- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
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- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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Abstract
The invention provides a method for manufacturing a curved surface type joint in a rock sample, which comprises the following steps: drilling and coring are carried out on a rock body to be tested, an end face grinding machine is used for grinding the end face of a sample, an alignment line is marked on the surface of the rock core along the axial direction, the rock core is cut off along a curve by adopting a high-pressure water jet cutter, and the rock core is spliced according to the alignment line. The method for manufacturing the cylindrical standard test piece of the real rock and stone material containing the curved surface type joint fissure for the indoor triaxial test has the advantages of convenient operation, strong practicability and accurate joint fissure positioning, and can be widely used for preparing the rock sample containing the curved surface type joint fissure.
Description
Technical Field
The invention belongs to the technical field of rock mass performance research, and particularly relates to a method for manufacturing a curved surface type joint in a rock sample.
Background
Plough fault structure is widely existed in various engineering slopes, and the special structural form is one of important factors causing deformation instability of the plough fault structure. More scholars study the structural evolution mechanism of the plough fault by adopting a test or numerical simulation method, but the study is limited to a sample preparation technology, and the joint form of 'up-steepness and down-slowness and continuous change' of the inclination angle of the plough fault is not well simulated in related experimental study. A curved surface type joint with continuously changing inclination angle exists in a rock body containing a plough fault structure. Research shows that plough faults have an extremely important relationship with earthquakes, oil and gas and solid mineral products. Therefore, the research on the mechanical properties of the curved jointed rock mass is of great significance for analyzing the effect of the plough type fault structure in oil and gas storage and geological disaster causes. The existing method for manufacturing the joint crack mainly aims at the plane type joint, and the curved surface type joint is rarely considered. The preparation of the curved surface type joint becomes a bottleneck for restricting the mechanical research of plough type fault structural rock. At present, the current research situation of the joint crack production method is as follows:
1. the patent 'a joint crack space forming and positioning device' introduces a method for simulating and positioning the space position of a joint crack in the process of pouring and forming rock-like materials. (see patent application No. 201720249663.6). The joint crack determined by the method is limited by the position of the positioning hole, is suitable for similar materials and is not suitable for real rocks.
2. The patent "method for manufacturing rock core containing joint fissure for multi-field coupling pull-down-shear fracture experiment" introduces a method for describing cracks on the surface of a rock block, filling the joint fissure with concrete prepared according to a natural joint weak surface material, and manufacturing a cylindrical rock core. (see patent application No. 201910587165.6). Aiming at Brazilian splitting experiments, shearing experiments and true triaxial experiments, the method finely simulates the physical and mechanical characteristics of the joint weak plane, is suitable for plane joints and is not suitable for curved surface joints.
3. The patent "a method for making three-dimensional joint crack cylindrical rock sample" introduces a method for cutting cracks in a cuboid rock block and making the three-dimensional joint crack cylindrical rock sample by adopting a drilling and coring mode. (see patent application No. 201510814787. X). The end part of the crack is easy to be subjected to impact load to generate stress concentration when the drilling stroke passes through the crack position, initial damage is formed, and the method is not suitable for curved surface type joints. 4. The patent "a mould case for prefabricating various joint cracks" introduces a square box body formed by mutually connecting and assembling assembled side plates and a chassis plate, and the mould case can be used for prefabricating various joint cracks. (see patent application No. 201520109083.8). The device is suitable for similar materials and is not suitable for real rocks.
5. A patent of a standard rock test piece prefabricated crack manufacturing device and a patent of the standard rock test piece prefabricated crack manufacturing method introduce the standard rock test piece prefabricated crack manufacturing device and the standard rock test piece prefabricated crack manufacturing method. (see patent application No. 201810966289.0). The method adopts a mechanical cutting mode, is suitable for manufacturing plane joints and is not suitable for manufacturing curved surface joints.
6. A patent of a complex fractured rock physical model and a modeling method based on 3D printing production introduces a complex fractured rock physical model and a modeling method based on 3D printing production, and the method is mainly characterized in that a fracture network is identified based on a digital image technology, and the structure of a joint fracture is reproduced through a modeling and printing mode. (see patent application No. 201610844752.5). The method is suitable for similar materials and is not suitable for real rocks.
7. The patent 'preparation method of brittle material for manufacturing rock-like and test piece prefabricated fracture' introduces a method for preparing test piece prefabricated fracture by using rock-like brittle material. (see patent application No. 200910013928.2). The method adopts the polyester film or kraft paper or metal sheets to simulate the angle and the position of the joint crack, is only suitable for similar materials, and is not suitable for real rocks.
Disclosure of Invention
Aiming at the difficult problem that the curved surface type joints in the real rock sample are difficult to process, the invention aims to provide a method for directly processing the curved surface type joint cracks in the real rock sample, which can avoid the impact vibration generated on the joint surface when the joint is cut firstly and then the rock core is drilled, has simple and convenient operation and can manufacture the linear or curved surface type joints with different geometric characteristics according to the requirements.
In order to achieve the technical features, the invention is realized as follows: a method of fabricating a curved joint in a rock sample, comprising the steps of:
the method comprises the following steps: sampling an engineering rock mass to be tested to form an engineering rock mass, and drilling and coring the engineering rock mass by adopting a vertical rock core drilling machine to obtain a cylindrical rock sample;
step two: polishing the end surface of the cylindrical rock sample to be smooth by adopting a double-end-surface rock grinding machine;
step three: manufacturing a groove bracket, putting a cylindrical rock sample into the bracket, and marking an alignment line parallel to an axis on the surface;
step four: drawing the curved surface type joint characteristics of the cylindrical rock sample by using CAD software, introducing the curved surface type joint characteristics into high-pressure water jet cutting equipment, and cutting the cylindrical rock sample by using a water jet cutter to manufacture a curved surface type cutting surface;
step five: putting the cut cylindrical rock sample into a groove bracket, splicing according to an alignment line, adopting gypsum as a crack filling material, and drying to perform a rock mechanical test.
The thickness of the engineering rock mass obtained in the first step is larger than the diameter of the cylindrical rock sample.
And reserving a water cutting depth of 2-3mm for the height of the cylindrical rock sample polished in the step two.
The groove bracket in the third step is formed by printing through a 3D printer; the middle part of the groove bracket is provided with an arc-shaped groove for placing a cylindrical rock sample.
In the water cutting process in the fourth step, the cylindrical rock sample needs to be fixedly arranged on the arc-shaped groove of the groove bracket.
The joint cracks formed by cutting in the fourth step are intermittent or continuous.
The joint cracks formed by cutting in the fourth step adopt single cracks or multiple cracks and are not limited to parallel or crossed cracks.
The invention has the following beneficial effects:
the method for manufacturing the standard sample of the cylindrical real rock containing the curved surface type joint fracture for the indoor triaxial test has the advantages of simple and convenient operation, strong practicability and accurate geometric characteristics of the joint fracture, and can be widely used for preparing joint fracture rock samples containing different geometric characteristics. Through practical tests, the method provided by the invention can prepare a curved surface type joint fissure rock sample meeting test requirements, can solve the problems that stress concentration is generated at the end part of a joint fissure in the process of cutting the fissure firstly and then drilling and coring, the upper joint surface and the lower joint surface are in contact and worn, can solve the problem that the processed and penetrated joint fissure cannot be aligned accurately when being bonded, has important practical significance for keeping the integrity of the joint fissure surface before the test and avoiding initial damage to the joint fissure in the sampling process, and indirectly eliminates the adverse effect of sampling on the test result. The invention applies the high-pressure water jet cutting technology to the manufacturing process of the curved surface type joint crack in the real rock, simultaneously considers the elimination of the initial damage of the sample preparation process to the joint crack surface, has intuitive and quick manufacturing process of the rock sample, and can manufacture the penetrating type three-dimensional joint crack standard rock sample containing different geometric parameters according to the test requirements.
Compared with the prior art, the method of the invention has the following characteristics:
1. the technical method can eliminate the initial damage of the crack surface when the three-dimensional joint crack is processed on the real rock.
2. The technical method of the invention can be used for manufacturing the internal three-dimensional joint cracks with more complex rock samples.
3. The method can accurately align and bond the part of the cut rock sample after the joint fracture cutting is finished.
4. The technical method of the invention finishes the grinding and flattening of the end surface of the cylindrical sample before cutting, and avoids the extrusion and abrasion of the joint crack surface during later grinding.
Drawings
The invention is further illustrated by the following figures and examples.
Figure 1 is a complete sample from a core drilled hole in a rock block.
Fig. 2 shows the completed sample placed on a groove holder and scored along the edge of the sample.
Fig. 3 shows the cutting of a sample placed on a wooden pallet using a water knife.
FIG. 4 shows a sample containing a curved surface type joint after cutting.
In the figure: cylindrical rock sample 1, recess bracket 2, alignment line 3, high-pressure water sword equipment 4, arc recess 5.
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings.
Example 1:
referring to fig. 1-4, a method of fabricating a curved joint in a rock sample, comprising the steps of:
the method comprises the following steps: sampling an engineering rock mass to be tested to form an engineering rock mass, and drilling and coring the engineering rock mass by adopting a vertical rock core drilling machine to obtain a cylindrical rock sample 1;
step two: polishing the end surface of the cylindrical rock sample 1 to be smooth by adopting a double-end-surface rock grinding machine;
step three: manufacturing a groove bracket 2, putting a cylindrical rock sample 1 into the bracket, and marking an alignment line 3 parallel to an axis on the surface;
step four: drawing the curved surface type joint characteristics of the cylindrical rock sample 1 by using CAD software, introducing the curved surface type joint characteristics into high-pressure water jet cutting equipment 4, and cutting the cylindrical rock sample 1 by using a water jet cutter to manufacture a curved surface type cutting surface;
step five: putting the cut cylindrical rock sample 1 into the groove bracket 2, splicing according to the alignment line 3, adopting gypsum as a crack filling material, and drying to perform a rock mechanical test.
Further, the thickness of the engineering rock mass obtained in the first step is larger than the diameter of the cylindrical rock sample 1.
Further, the height of the cylindrical rock sample 1 after being polished in the second step is reserved with a water cutting depth of 2-3 mm.
Further, the groove bracket 2 in the third step is formed by printing through a 3D printer; and an arc-shaped groove 5 for placing the cylindrical rock sample 1 is processed in the middle of the groove bracket 2.
Further, in the fourth step, during the water cutting process, the cylindrical rock sample 1 needs to be fixedly arranged on the arc-shaped groove 5 of the groove bracket 2.
Further, the joint cracks cut in the fourth step are intermittent or continuous.
Furthermore, the joint cracks cut in the fourth step are single cracks or multiple cracks, and are not limited to parallel or crossed cracks.
Example 2:
taking limestone taken from a certain engineering site as an example, a method for preparing a curved joint fissure cylindrical rock sample is introduced, and comprises the following steps:
the method comprises the following steps: firstly, using a ZS-100 type vertical rock core drilling machine to sleeve an engineering rock block obtained on an engineering site to obtain a complete cylindrical limestone sample, and using a cutting machine to cut the end face to obtain a standard cylindrical rock sample 1 as shown in figure 1, wherein the length L of the cylindrical rock sample 1 is 100mm, and the diameter of the cylindrical rock sample 1 is 50 mm; considering the loss of subsequent end face grinding and water jet cutting, the length L of the sample is kept to be about 103 mm;
step two: polishing the end face of the cut cylindrical rock sample 1 by using an SCM-300 double-face polishing machine;
step three: placing a cylindrical rock sample 1 on a 3D printed groove carrier 2, and scribing along the side to form an alignment line 3, as shown in FIG. 2;
step four: the polished cylindrical rock sample 1 is a complete rock sample, a groove bracket 2 is arranged on a Boyan brand, the complete rock sample is led into a high-pressure water jet device 4, a penetrating curved surface type joint crack is cut according to designed geometric parameters, as shown in figure 3, and the cut cylindrical sample containing the penetrating type joint crack is as shown in figure 4;
step five: splicing different parts of the cut cylindrical rock sample according to surface scribing lines, and bonding cracks by using gypsum;
preferably, the cutting depth of the high-pressure water jet is more than 50mm of the diameter of the cylindrical rock sample.
The joint crack obtained in the fourth step can be through or non-through, and the joint crack can be filled with no material or soft materials such as gypsum and the like.
Claims (7)
1. A method for manufacturing a curved surface type joint in a rock sample is characterized by comprising the following steps:
the method comprises the following steps: sampling an engineering rock mass to be tested to form an engineering rock mass, and drilling and coring the engineering rock mass by adopting a vertical rock core drilling machine to obtain a cylindrical rock sample (1);
step two: polishing the end surface of the cylindrical rock sample (1) to be smooth by adopting a double-end-surface rock grinding machine;
step three: manufacturing a groove bracket (2), putting a cylindrical rock sample (1) into the bracket, and marking an alignment line (3) parallel to an axis on the surface;
step four: drawing the curved surface type joint characteristics of the cylindrical rock sample (1) by using CAD software, introducing the curved surface type joint characteristics into high-pressure water jet equipment (4), and cutting the cylindrical rock sample (1) by using a water jet to manufacture a curved surface type cutting surface;
step five: putting the cut cylindrical rock sample (1) into the groove bracket (2), splicing according to the alignment line (3), adopting gypsum as a crack filling material, and performing a rock mechanical test after drying.
2. The method of claim 1, wherein the method further comprises: the thickness of the engineering rock mass obtained in the first step is larger than the diameter of the cylindrical rock sample (1).
3. The method of claim 1, wherein the method further comprises: and reserving a water cutting depth of 2-3mm for the height of the cylindrical rock sample (1) polished in the step two.
4. The method of claim 1, wherein the method further comprises: the groove bracket (2) in the third step is formed by printing through a 3D printer; the middle part of the groove bracket (2) is provided with an arc-shaped groove (5) for placing a cylindrical rock sample (1).
5. The method of claim 1, wherein the method further comprises: in the water cutting process in the fourth step, the cylindrical rock sample (1) needs to be fixedly arranged on the arc-shaped groove (5) of the groove bracket (2).
6. The method of claim 1, wherein the method further comprises: the joint cracks formed by cutting in the fourth step are intermittent or continuous.
7. The method of claim 1, wherein the method further comprises: the joint cracks formed by cutting in the fourth step adopt single cracks or multiple cracks and are not limited to parallel or crossed cracks.
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| CN202111500583.0A CN114354305A (en) | 2021-12-09 | 2021-12-09 | Method for manufacturing curved surface type joint in rock sample |
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| CN202111500583.0A CN114354305A (en) | 2021-12-09 | 2021-12-09 | Method for manufacturing curved surface type joint in rock sample |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117804859A (en) * | 2023-12-21 | 2024-04-02 | 中国矿业大学 | Oblique splitting crack device for injection induced dry-hot rock fault activation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105424435A (en) * | 2015-11-20 | 2016-03-23 | 中国矿业大学 | Method for manufacturing three-dimensional joint-fissure cylindrical rock sample |
| CN105773850A (en) * | 2016-04-12 | 2016-07-20 | 安徽理工大学 | Cutting device for preparing rock samples containing different dip angle structural surfaces and operation method |
| CN106769321A (en) * | 2017-01-10 | 2017-05-31 | 河海大学 | Different research of joints roughness coefficient of rock blind joint strata model preparation method of sample and prepare mould |
| CN106769285A (en) * | 2016-11-29 | 2017-05-31 | 河海大学 | It is a kind of to make many joints and with the cutter sweep of different joints characteristics rock samples |
| CN108680381A (en) * | 2018-05-16 | 2018-10-19 | 中国地质大学（武汉） | A kind of cylindrical specimens sampling method in the face containing coarse structure |
| CN110823720A (en) * | 2019-11-20 | 2020-02-21 | 清华大学 | Direct shear test method for natural cemented filling rock fracture under high temperature condition |
| CN111537699A (en) * | 2020-05-29 | 2020-08-14 | 煤炭科学技术研究院有限公司 | Method for distinguishing hard rock stratum of coal mine through multiple indexes |
-
2021
- 2021-12-09 CN CN202111500583.0A patent/CN114354305A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105424435A (en) * | 2015-11-20 | 2016-03-23 | 中国矿业大学 | Method for manufacturing three-dimensional joint-fissure cylindrical rock sample |
| CN105773850A (en) * | 2016-04-12 | 2016-07-20 | 安徽理工大学 | Cutting device for preparing rock samples containing different dip angle structural surfaces and operation method |
| CN106769285A (en) * | 2016-11-29 | 2017-05-31 | 河海大学 | It is a kind of to make many joints and with the cutter sweep of different joints characteristics rock samples |
| CN106769321A (en) * | 2017-01-10 | 2017-05-31 | 河海大学 | Different research of joints roughness coefficient of rock blind joint strata model preparation method of sample and prepare mould |
| CN108680381A (en) * | 2018-05-16 | 2018-10-19 | 中国地质大学（武汉） | A kind of cylindrical specimens sampling method in the face containing coarse structure |
| CN110823720A (en) * | 2019-11-20 | 2020-02-21 | 清华大学 | Direct shear test method for natural cemented filling rock fracture under high temperature condition |
| CN111537699A (en) * | 2020-05-29 | 2020-08-14 | 煤炭科学技术研究院有限公司 | Method for distinguishing hard rock stratum of coal mine through multiple indexes |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117804859A (en) * | 2023-12-21 | 2024-04-02 | 中国矿业大学 | Oblique splitting crack device for injection induced dry-hot rock fault activation |
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