CN110907253A - Mold and method for preparing cylindrical sample containing axial cracks - Google Patents
Mold and method for preparing cylindrical sample containing axial cracks Download PDFInfo
- Publication number
- CN110907253A CN110907253A CN201911332250.4A CN201911332250A CN110907253A CN 110907253 A CN110907253 A CN 110907253A CN 201911332250 A CN201911332250 A CN 201911332250A CN 110907253 A CN110907253 A CN 110907253A
- Authority
- CN
- China
- Prior art keywords
- crack
- cover plate
- axial
- circular
- cylindrical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
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
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a die and a method for preparing a cylindrical sample containing an axial crack. The invention relates to a die for preparing a cylindrical sample containing an axial crack, which comprises a steel die, an insert sheet and a cover plate, wherein the insert sheet is printed by a 3D printer through modeling; the steel mould is of a cylindrical structure, the width, the roughness and the thickness of the insert are equal to those of the axial crack to be prepared, the cover plate is of a disc-shaped combined structure, the crack with the same shape as the axial crack to be prepared is preset on the cover plate, and the crack penetrates through the whole cover plate. According to the method for preparing the cylindrical sample containing the axial cracks, the cylindrical sample containing the axial prefabricated cracks can be directly prepared by using the special die, the method for preparing the cylindrical sample by using a drilling machine is avoided, and the preparation efficiency and the success rate of the sample are effectively improved.
Description
Technical Field
The invention relates to the technical field of rock mechanics and engineering, in particular to a die and a method for preparing a cylindrical sample containing an axial crack.
Background
With the acceleration of infrastructure construction, construction schemes such as foundation pit excavation and tunnel blasting are increasingly applied to project construction in the construction process of railways, roads and subways, the construction methods inevitably disturb and damage nearby rock-soil bodies, and due to the actions of excavation of the foundation pits, tunnel surrounding rock blasting and the like, numerous cracks with complex properties and different production states are generated in the rock bodies to influence the stability of the rock bodies and the safety of buildings to a great extent. Therefore, the research on the mechanical properties of fractured rocks containing different occurrence states can greatly help the engineering safety evaluation and the geologic body stability evaluation. In view of the random distribution of joints and cracks in natural rock mass and the difficulty in controlling the variable characteristics of cracks in a sample, at present, researchers at home and abroad widely adopt rock-like materials made of cement mortar to carry out experimental study on the mechanical properties of cracked rock mass. In some tests which need standard cylindrical samples, most scholars prepare test blocks containing cracks in a square or rectangular mould in advance and drill cylindrical core samples through a vertical core drilling machine so as to obtain cylindrical rock-like samples containing prefabricated cracks. However, the method has high requirements on the flatness of a platform for placing the sample to be drilled and the stability of the sample, otherwise, the cored sample can be inclined or broken, the method has large workload and complex operation, and the cleaning task is heavy after the sample drilling is finished. Therefore, a method for acquiring a cylindrical sample containing a prefabricated fracture more conveniently and efficiently is needed in the field of preparation and processing of rock-like samples.
Chinese patent CN105424435 discloses a method for manufacturing a three-dimensional joint crack cylindrical rock sample, which uses a high-pressure water jet cutter to cut joint cracks on a rectangular regular rock block, and adopts a vertical rock core-taking machine to sleeve and take a rock core on the rectangular regular rock block containing the joint cracks. And fails to overcome the drawbacks of the vertical coring method.
Chinese patent CN106872242 discloses a device and a method for making a cylindrical sample of rock or concrete for laboratory use, in which a coaxial motor and a lateral abrasive sheet are used to grind a square or hexahedral sample material into a cylindrical sample, the method has the disadvantages of uneven diameter in the grinding process, easy damage to the sample by radial grinding under axial high-speed rotation condition, long grinding time and low sample making efficiency.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a die and a method for preparing a cylindrical sample containing an axial crack.
The invention provides a die for preparing a cylindrical sample containing an axial crack, which comprises a steel die, an insert piece printed by a 3D printer through modeling and a cover plate, wherein the steel die is of a cylindrical structure, the width, the roughness and the thickness of the insert piece are equal to those of the axial crack to be prepared, the cover plate is of a disc-shaped combined structure, a crack with the same shape as that of the axial crack to be prepared is preset on the cover plate, and the crack penetrates through the whole cover plate.
Further, the steel mould comprises a circular base, a split cylindrical side wall and a circular ring clamp; the circular base is a small-diameter circular plate protruding above the large-diameter circular plate, and a screw hole capable of being inserted with an inner hexagonal screw is formed in the small circular plate along the diameter direction and used for fixing the cylindrical side wall. The large circular plate and the small circular plate are cast integrally. The split cylindrical side walls can be divided into 2 semicircular tubular side walls along the diameter, and the lower end of each semicircular tubular side wall is provided with a round hole for inserting an inner hexagonal screw. The circular ring hoop is sleeved at the top end of the cylindrical side wall and fixed through screws arranged on two sides of the circular ring hoop.
The shape and the size of the cover plate are the same as those of the steel mould base.
The invention provides a method for preparing a cylindrical sample containing an axial fracture, which is used for preparing the cylindrical rock-like sample containing the axial fracture by using the die and comprises the following steps:
step one, assembling a steel mould, wherein the steel mould comprises a circular base, split cylindrical side walls and a circular ring hoop, the split cylindrical side walls are fixed on the circular base through inner hexagonal screws, the circular ring hoop is fixed on the top end of the cylindrical side walls through screws on two sides of the circular ring hoop, and vaseline is smeared on the surface of the steel mould.
And secondly, printing the inserting sheet and the cover plate by using a 3D printer for modeling, wherein the width, the roughness and the thickness of the inserting sheet are equal to those of the axial crack to be prepared, and the cover plate is preset with a crack with the same appearance as that of the axial crack to be prepared.
And step three, pouring cement mortar into the steel mould and fully vibrating.
And step four, placing the cover plate containing the prefabricated crack on the top of the steel mould.
And fifthly, coating vaseline on the surface of the insert, and then inserting the insert into the vibrated cement mortar through a prefabricated crack on the cover plate.
And step six, after the cement mortar is cured and molded, pulling out the insert, removing the cover plate, and demolding to finally obtain the cylindrical sample containing the axial cracks.
Further, the material of the insert and the cover plate in the second step is polylactic acid which is insoluble in water.
The invention has the beneficial effects that:
1. the method can directly prepare the cylindrical sample containing the axial prefabricated crack by using the special die, avoids the method for preparing the cylindrical sample by using a drilling machine, and effectively improves the preparation efficiency and the success rate of the sample.
2. According to the invention, the insert and the cover plate are prepared by adopting a 3D printing technology, so that the position of the crack can be accurately positioned, and the occurrence factors such as the length, the roughness, the opening degree and the like of the crack can be accurately controlled.
3. The steel mould is firm and durable, easy to process and reusable, only the 3D printer is needed to manufacture the inserting pieces and the cover plates in different forms for preparing the crack samples in different forms, the contour and the inner cavity of the model are not needed to be printed, time and materials can be greatly saved, and the preparation efficiency of the crack samples containing the prefabricated cracks is improved.
4. According to the preparation method, the cement mortar is added and vibrated in the mold, and then the inserting pieces are inserted, so that the change of the position and the form of the prefabricated crack caused by pouring and vibrating can be reduced, and the accuracy of the prefabricated crack is greatly improved.
Drawings
FIG. 1 is a schematic diagram of a mold for preparing a cylindrical sample containing axial fissures according to the present invention.
FIG. 2 is a schematic representation of the steel mold structure of the present invention.
FIG. 3 is a schematic view of the base of the steel mold of the present invention.
FIG. 4 is a schematic side wall view of the steel mold of the present invention.
FIG. 5 is a schematic view of a clamp of the steel mold of the present invention.
FIG. 6 is a schematic view of an insert of the present invention.
Fig. 7 is a schematic view of the cover plate of the present invention.
FIG. 8 is a schematic representation of a cylindrical sample containing axial fissures after casting is complete.
In the figure: 1-a steel mould; 2-inserting pieces; 3-cover plate; 4-cracking; 5-a circular base; 6-cylindrical side wall; 7-a circular hoop; 8-large circular plate; 9-small circular plate; 10-hexagon socket head cap screw; 11-screw holes; 12-a circular hole; 13-screw.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1 to 5, the mold for preparing a cylindrical sample containing an axial crack provided by the invention comprises a steel mold 1, an insert 2 printed by a 3D printer through modeling and a cover plate 3; the steel mould 1 is of a cylindrical structure; the width, the roughness and the thickness of the inserting piece 2 are equal to those of an axial crack to be prepared; the cover plate 3 is of a disc-shaped combined structure, the crack 4 with the same shape as the axial crack to be prepared is preset on the cover plate 3, and the crack 4 penetrates through the whole cover plate 3.
The steel die 1 comprises a circular base 5, a split cylindrical side wall 6 and a circular ring hoop 7; wherein, 5 shapes of circular base are the protruding little plectane 9 in big plectane 8 top, and big plectane 8 diameter is 54mm, and thickness is 2mm, and little plectane 9 diameter is 50mm, and thickness is 3mm, is equipped with the screw 11 that can insert hexagon socket head cap screw 10 on little plectane 9 along the diameter direction for fixed cask shape lateral wall 6. The large circular plate 8 and the small circular plate 9 which form the circular base 5 are cast integrally. The split cylindrical side wall 6 can be divided into 2 semicircular tubular side walls along the diameter, and the lower end of each semicircular tubular side wall is provided with a round hole 12 for inserting an inner hexagonal screw 10; the inner diameter of the cylindrical side wall 6 is 50mm, the outer diameter is 54mm, and the wall thickness is 4 mm; the inner diameter of the circular hoop 7 is 54mm, and the circular hoop 7 is sleeved on the top end of the cylindrical side wall 6 and fixed through screws 13 arranged on two sides of the circular hoop 7.
The shape and the size of the 3D printing cover plate are the same as those of the circular base 5 of the steel mould.
As shown in fig. 1 to 8, the method for preparing a cylindrical sample containing an axial slit provided by the present invention, specifically, the method for preparing a cylindrical sample containing an axial slit by using the above mold, includes the following steps:
step one, assembling a steel die 1, wherein the steel die 1 comprises a circular base 5, a split cylindrical side wall 6 and a circular ring hoop 7, the split cylindrical side wall 6 is fixed on the circular base 5 through a hexagon socket head cap screw 10, the circular ring hoop 7 is fixed on the top end of the cylindrical side wall 6 through screws 13 on two sides of the circular ring hoop, and vaseline is smeared on the surface of the steel die 1.
And step two, printing the inserting piece 2 and the cover plate 3 through a 3D printer, wherein the width, the roughness and the thickness of the inserting piece 2 are equal to those of an axial crack to be prepared, and the crack 4 with the same appearance as that of the axial crack to be prepared is preset on the cover plate 3.
And step three, pouring cement mortar into the steel mould 1 and sufficiently vibrating.
And step four, placing the cover plate 3 containing the prefabricated crack 4 on the top of the steel mould 1.
And fifthly, coating vaseline on the surface of the inserting piece 2, and then inserting the inserting piece 2 into the vibrated cement mortar through the prefabricated crack 4 on the cover plate 3.
And step six, after the cement mortar is cured and molded, pulling out the inserting piece 2, removing the cover plate 3, and demolding 1 to finally obtain the cylindrical sample containing the axial cracks.
The following further discloses embodiments of the present invention in terms of a mold and method for preparing a cylindrical sample containing axial fissures according to the present invention.
Taking the preparation of a rock-like cylindrical sample containing an axial single fracture as an example, wherein the roughness of the expanded single fracture is 1, the opening degree is 2mm, the length is 20mm, the inclination angle is 45 degrees, the inclination is 0 degree, and the position is the center of the rock-like sample, the diameter and the height of the rock-like sample are respectively 50mm and 100mm, and the concrete implementation steps are as follows:
step one, assembling a steel die 1: steel mould 1 includes circular base 5, can run from opposite directions cylinder lateral wall 6, ring clamp 7, will can run from opposite directions cylinder lateral wall 6 passes through hexagon socket head cap screw 10 to be fixed on circular base 5, fixes ring clamp 7 on the top of cylinder lateral wall 6 through the screw 13 of its both sides steel mould 1 surface is paintd vaseline.
And step two, modeling through AutoCAD, and printing by adopting a 3D printer to obtain the inserting piece 2, wherein the width, the roughness and the thickness of the inserting piece 2 are consistent with the geometric form, the roughness and the opening degree of the prefabricated crack. In this embodiment, the width of the insert 2 is 20mm, the roughness is 1, the thickness is 2mm, and the length is 120mm, and the printing material of the insert 2 is polylactic acid insoluble in water. Through the modeling of AutoCAD, use the 3D printer to print and obtain apron 3, apron 3 thickness is 5mm, the shape and the specification of apron 3 are unanimous with steel mould circular base 5, and the tendency, the inclination and the roughness of the crack 4 of presetting in the apron 3 are unanimous with the tendency, the inclination and the roughness of prefabricating crack 4. In this example, the pre-set crack 4 in the cover plate 3 had a tendency of 0 °, an inclination of 45 °, and a roughness of 1, the position was the center of the rock-like sample, and the 3D printed material of the cover plate 3 was polylactic acid insoluble in water.
And step three, pouring cement mortar into the steel mould and fully vibrating. In this example 1, the cement mortar mixing ratio is cement: quartz sand: water 1:2:0.45, cement designation 32.5.
And step four, covering the cover plate 3 containing the prefabricated crack 4 on the top surface of the steel mould 1.
And fifthly, coating vaseline on the outer part of the inserting sheet 2, and then inserting the inserting sheet 2 into the steel die 1 through a preset crack 4 until the inserting sheet touches a small circular plate 9 of the circular base 5 of the steel die.
And step six, after 24 hours, pulling out the inserting piece 2 and removing the cover plate 3. And after the cement mortar is solidified and formed, removing the steel die 1, taking out the cylindrical sample, and placing the cylindrical sample in a constant temperature and humidity box with the temperature of 20 ℃ and the humidity of 95% for curing for 28 days to obtain the rock-like cylindrical sample containing the axial cracks.
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. The utility model provides a preparation contains mould of cylindric sample of axial crack which characterized in that: the steel mould is of a cylindrical structure, the width, the roughness and the thickness of the inserting sheet are equal to those of an axial crack to be prepared, the cover plate is of a disc-shaped combined structure, a crack which is the same as the axial crack to be prepared in shape is preset on the cover plate, and the crack penetrates through the whole cover plate.
2. The mold for preparing a cylindrical test specimen having axial slits according to claim 1, wherein: the steel mould comprises a circular base, a split cylindrical side wall and a circular ring hoop; the circular base is a small circular plate protruding above the large circular plate, and a screw hole capable of being inserted with an inner hexagonal screw is formed in the small circular plate along the diameter direction and used for fixing the cylindrical side wall; the large circular plate and the small circular plate are cast integrally; the split cylindrical side walls (6) are divided into two semi-circular tubular side walls along the diameter, and the lower end of each semi-circular tubular side wall is provided with a round hole for inserting an inner hexagonal screw; the ring clamp is sleeved on the top end of the cylindrical side wall and fixed through screws arranged on two sides of the ring clamp.
3. The mold for preparing a cylindrical test specimen having axial slits according to claim 1, wherein: the shape and the size of the cover plate are the same as those of the circular base of the steel die.
4. A method of preparing a cylindrical sample containing axial slits using the mold according to any one of claims 1 to 3, characterized in that: the method comprises the following steps:
assembling a steel mould, wherein the steel mould comprises a circular base, split cylindrical side walls and a circular ring hoop, the split cylindrical side walls are fixed on the circular base through inner hexagonal screws, the circular ring hoop is fixed at the top end of the cylindrical side walls through screws on two sides of the circular ring hoop, and vaseline is coated on the surface of the steel mould;
printing the insert and the cover plate by a 3D printer through modeling, wherein the width, the roughness and the thickness of the insert are equal to those of an axial crack to be prepared, and the cover plate is preset with a crack with the same appearance as that of the axial crack to be prepared;
pouring cement mortar into the steel mould and fully vibrating;
fourthly, placing the cover plate containing the prefabricated crack on the top of the steel mould;
coating vaseline on the surface of the insert, and then inserting the insert into the vibrated cement mortar through a prefabricated crack on the cover plate;
and step six, after the cement mortar is cured and molded, pulling out the insert, removing the cover plate, and demolding to finally obtain the cylindrical sample containing the axial cracks.
5. The method of preparing a cylindrical sample containing axial fissures as claimed in claim 4, characterized in that: in the second step, the inserting sheet and the cover plate are both made of polylactic acid which is insoluble in water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911332250.4A CN110907253A (en) | 2019-12-22 | 2019-12-22 | Mold and method for preparing cylindrical sample containing axial cracks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911332250.4A CN110907253A (en) | 2019-12-22 | 2019-12-22 | Mold and method for preparing cylindrical sample containing axial cracks |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110907253A true CN110907253A (en) | 2020-03-24 |
Family
ID=69827016
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911332250.4A Pending CN110907253A (en) | 2019-12-22 | 2019-12-22 | Mold and method for preparing cylindrical sample containing axial cracks |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110907253A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114199647A (en) * | 2021-12-13 | 2022-03-18 | 四川大学 | Rock mass in-situ stress curing method and curing system |
| CN115901389A (en) * | 2022-03-07 | 2023-04-04 | 北京市市政工程研究院 | Method for forming cracks in concrete |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105651571A (en) * | 2015-12-29 | 2016-06-08 | 河海大学 | Preparation method of non-through fractured rock mass test sample based on 3D printing technology |
| CN105675365A (en) * | 2016-01-18 | 2016-06-15 | 河海大学 | Method for preparing fractured rock mass samples with filler |
| CN107782600A (en) * | 2017-10-23 | 2018-03-09 | 中国矿业大学 | A kind of mould and method for making prefabricated filling fracture and unfilling fracture Brazilian disk specimen |
| CN108318318A (en) * | 2018-01-15 | 2018-07-24 | 中国矿业大学 | A kind of mold and method making the crack of the three-dimensional preformed containing filling rocks sample based on 3D printing technique |
| CN109916680A (en) * | 2019-03-08 | 2019-06-21 | 河海大学 | Prepare the mold and method with the rocks sample for the Single Fracture for opening or being closed |
| CN212059590U (en) * | 2019-12-22 | 2020-12-01 | 浙江省水利水电勘测设计院 | Mould for preparing cylindrical sample containing axial cracks |
-
2019
- 2019-12-22 CN CN201911332250.4A patent/CN110907253A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105651571A (en) * | 2015-12-29 | 2016-06-08 | 河海大学 | Preparation method of non-through fractured rock mass test sample based on 3D printing technology |
| CN105675365A (en) * | 2016-01-18 | 2016-06-15 | 河海大学 | Method for preparing fractured rock mass samples with filler |
| CN107782600A (en) * | 2017-10-23 | 2018-03-09 | 中国矿业大学 | A kind of mould and method for making prefabricated filling fracture and unfilling fracture Brazilian disk specimen |
| CN108318318A (en) * | 2018-01-15 | 2018-07-24 | 中国矿业大学 | A kind of mold and method making the crack of the three-dimensional preformed containing filling rocks sample based on 3D printing technique |
| CN109916680A (en) * | 2019-03-08 | 2019-06-21 | 河海大学 | Prepare the mold and method with the rocks sample for the Single Fracture for opening or being closed |
| CN212059590U (en) * | 2019-12-22 | 2020-12-01 | 浙江省水利水电勘测设计院 | Mould for preparing cylindrical sample containing axial cracks |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114199647A (en) * | 2021-12-13 | 2022-03-18 | 四川大学 | Rock mass in-situ stress curing method and curing system |
| CN115901389A (en) * | 2022-03-07 | 2023-04-04 | 北京市市政工程研究院 | Method for forming cracks in concrete |
| CN115901389B (en) * | 2022-03-07 | 2023-09-15 | 北京市市政工程研究院 | Method for forming cracks in concrete |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105424435B (en) | A kind of method for making three-dimensional joint fissure cylindrical type rock sample | |
| CN103983494B (en) | A kind of containing interlayer class rock mass analogue formation test unit and test method thereof | |
| CN104807685B (en) | The joint samples method of the structural plane containing particular geometric feature is made using 3D printing | |
| CN105823660B (en) | A kind of production method of soft rock undisturbed sample | |
| CN108225859B (en) | Method for preparing single-fracture rock sample based on 3D printing technology | |
| CN112345334B (en) | Preparation method of rock sample containing anisotropic joints based on 3D printing | |
| CN110376030B (en) | Preparation method of irregular columnar joint rock sample | |
| CN110376039B (en) | Device and method for manufacturing prefabricated cracks of standard rock-like sample | |
| CN110907253A (en) | Mold and method for preparing cylindrical sample containing axial cracks | |
| CN107941592B (en) | Simulation prefabrication experimental method for built-in precisely controlled variable fracture rock | |
| CN103837390B (en) | Manufacturing method for rock test sample containing hole defects | |
| CN111044339B (en) | Single-crack manufacturing mold for composite structure and using method of single-crack manufacturing mold | |
| CN106769321A (en) | Different research of joints roughness coefficient of rock blind joint strata model preparation method of sample and prepare mould | |
| CN112362442A (en) | Rock-like sample manufacturing mold and using method thereof | |
| CN212722305U (en) | Surrounding rock crack prefabrication system under excavation disturbance | |
| CN102866050A (en) | Preparation method of irregular easily-broken coal rock block test piece | |
| CN111157322B (en) | Preparation method of irregular columnar jointed rock mass sample of nested interlayer dislocation zone | |
| CN104297011A (en) | Forming and spatial positioning method for caverns in high-brittleness transparent rock-like material test piece | |
| CN212059590U (en) | Mould for preparing cylindrical sample containing axial cracks | |
| CN111693357A (en) | Sample preparation mold and sample preparation method of fractured rock mass test piece based on 3D printing technology | |
| CN111929142A (en) | Surrounding rock fracture prefabrication system under excavation disturbance and grouting test piece manufacturing method | |
| CN111175105B (en) | Preparation method of stratified rock mass rock sample | |
| CN111006930A (en) | Assembled similar material rock mass test piece manufacturing die for rock mass size effect research | |
| CN207439782U (en) | A kind of Brazil of platform containing crack sample machining device | |
| CN201331481Y (en) | Concrete test block molding mold for concrete electric flux measurement |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |