CN113916886A - Mudstone remodeling method based on microscopic morphology image analysis - Google Patents
Mudstone remodeling method based on microscopic morphology image analysis Download PDFInfo
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Abstract
The invention relates to a mudstone remodeling method based on microscopic morphology image analysis, belonging to the field of rock mechanics tests
) And a deformation parameter; and carrying out X-ray diffraction analysis and test to obtain the composition and content information of the undisturbed mudstone. The invention comprehensively considers the grading characteristics of undisturbed mudstone particles, mineral components, cementing types and components, density, water content and overlying stratum pressure effect, and adopts mudstone crumbles to prepare the cementThe prepared sample is closer to the original-state mudstone, and the mechanical property of the original-state mudstone can be better simulated; in addition, the pressure hammer of the device adopted by the invention can apply stable consolidation pressure, and the scale can be arranged to observe the height change of the sample at any time, so that the obtained remolded rock sample is closer to a real rock sample.
Description
Technical Field
The invention relates to the field of rock mechanics tests, in particular to a mudstone remodeling method based on micro-topography image analysis.
Background
The mudstone is widely distributed and has the characteristics of easy softening and disintegration when meeting water and water loss and cracking. When the relevant experimental research is carried out on the mudstone, a standard undisturbed sample meeting the requirements of experimental specifications is difficult to obtain, so that the research for remolding the mudstone is necessary.
According to the traditional mudstone remodeling method, bentonite, quartz, cement and the like are mostly used as remodeling materials, so that the material composition of mudstone is changed; or simply adding water into the mudstone fragments until the mudstone fragments can be kneaded into a ball by hands and then pressing the ball into a sample at one time, wherein the prepared remolded rock sample has non-uniform density and uncontrollable water content; in addition, according to the traditional remodeling method, the compaction hammer is adopted for manual compaction, the pressure of the overlying strata is not considered, and the height of the sample needs to be judged by a graduated scale in real time during layered sample preparation, so that the operation is complicated.
Disclosure of Invention
The invention aims to provide a mudstone remolding method based on microscopic morphology image analysis, which comprehensively considers the grain composition characteristics, mineral components, cementing types and components, density, water content and overlying stratum pressure effect of undisturbed mudstone, adopts mudstone crumbs to prepare a sample, ensures that the prepared sample is closer to the undisturbed mudstone, and can better simulate the mechanical characteristics of the undisturbed mudstone; in addition, the pressure hammer of the device adopted by the invention can apply stable consolidation pressure, the scale is arranged, the height change of the sample can be observed at any time, and the obtained remolded rock sample is closer to a real rock sample, thereby solving the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a mudstone remodeling method based on microscopic morphology image analysis comprises the following steps:
s1, obtaining the original mudstone on site, carrying out the basic physical mechanical test, and obtaining the density, the water content and the strength (sigma c, c) of the original mudstone,
) And deformation parameters (E, v);
s2, carrying out X-ray diffraction analysis and test to obtain the composition and content information of the undisturbed mudstone;
s3, obtaining the micro-morphology image of the undisturbed mudstone by using a polarizing microscope, processing and analyzing to obtain the particle grading characteristics of the undisturbed mudstone and determining the cementation type of the undisturbed mudstone;
s4, selecting the added gel material according to the cementing material component and the material component of the undisturbed mudstone, designing a group of gel material adding proportion,
s5, obtaining on-site debris of the mudstone, drying and crushing the debris, and then performing a screening test;
s6, calculating the overburden pressure of the undisturbed mudstone to determine the pressure applied during sample preparation;
s7, preparing a mixture of mudstone particles, water and a cementing material within each particle size range;
s8, preparing remolded mudstone, and consolidating under the pressure of an overlying stratum;
s9, obtaining a micro-morphology image of the remolded mudstone by using a polarizing microscope, and analyzing and determining the cementing type of the remolded mudstone;
s10, selecting remolded mudstones with the cementing types consistent with those of the original mudstones, and carrying out original indoor triaxial compression and uniaxial compression strength tests on the remolded mudstones to obtain strength indexes (sigma c, m,
) And deformation parameters (E, v) and comparing with the parameters of the undisturbed mudstone; carrying out indoor triaxial compression and uniaxial compression tests on the remolded mudstone to obtain the strength indexes (sigma c, c,
) And deformation parameters (E, v) and comparing with the parameters of the undisturbed mudstone;
s11, if the difference between the related parameters of the remolded mudstone and the undisturbed mudstone in the S10 is large, repeating the operations from S4 to S10 until a group of sigmac, c,
E. V and sigma c, c of undisturbed mudstone,
E. And v, until a group of remolded mudstone is close, and taking the mixing proportion of the group of remolded mudstone cementing materials as the remolded mudstone mixing proportion.
As a further aspect of the present invention, the step of preparing the polarizing microscope slide in S3 includes: and (3) making a plurality of groups of parallel samples, acquiring original-state mudstone morphology images under multiple times, distinguishing particle sizes according to the maximum length of particles due to the irregular shape of the particles, and obtaining the particle grading of the original-state mudstone through image processing analysis.
As a further technical solution of the present invention, the obtaining of the particle size distribution characteristics in S3 is: the grain grading characteristics in the S3 are obtained as follows: the method comprises the steps of firstly solving the content of particles in each particle size range under each multiple, then drawing a scatter diagram and fitting the scatter diagram by taking the percentage content of the particles as a vertical coordinate and the magnification factor as a horizontal coordinate, and selecting the percentage content of the mudstone particles with the intercept on the vertical coordinate as the corresponding particle size range when the mudstone is remolded.
As a further technical solution of the present invention, the determination of the cementing material in S4 is: the cementing material is determined according to the material composition and cementing type of the undisturbed mudstone, and the original material composition of the mudstone is not changed.
As a further technical scheme of the invention, in the S8, a consolidation device is adopted for preparing the remolded mudstone, the consolidation device comprises a bracket, a pressure device, a mold, a workbench and a controller, when preparing the remolded mudstone, the mold is assembled, vaseline is coated on the inner side of the arc-shaped template, then the arc-shaped template is arranged on the base, and a hoop is sleeved on the arc-shaped template; fixing the assembled die on a workbench through a die base by using a bottom bolt; and opening a control power supply, setting consolidation pressure equal to the pressure of an overlying stratum of the undisturbed mudstone by using a pressure controller, applying consolidation pressure to the mudstone mixture in the mould through a pressure hammer which is arranged between a support top plate and a cover plate and is connected with a jack and provided with a scale until the scale reaches/locates to finish the sample preparation of a first layer, roughening the surface of the sample, repeating the operation, sleeving a heightening sleeve above the mould before adding the mudstone mixture for the last time, and then applying pressure to finish the sample preparation process.
As a further technical scheme of the invention, a graduated scale capable of directly reading the height of the sample is arranged on the pressure hammer of the concreting device.
As a further technical scheme of the invention, the grain composition characteristics, mineral components, cementing type and components, density, water content and overburden pressure effect of the undisturbed mudstone are comprehensively considered in the steps S1 to S9.
Compared with the prior art, the invention has the beneficial effects that: the grain composition characteristics, mineral components, cementing types and components, density, water content and overlying stratum pressure action of the undisturbed mudstone are comprehensively considered, and samples are prepared by adopting mudstone crumbs, so that the prepared samples are closer to the undisturbed mudstone, and the mechanical properties of the undisturbed mudstone can be better simulated; in addition, the pressure hammer of the device adopted by the invention can apply stable consolidation pressure, and the scale can be arranged to observe the height change of the sample at any time, so that the obtained remolded rock sample is closer to a real rock sample.
Drawings
FIG. 1 is a schematic structural view of a consolidation apparatus in accordance with the present invention;
FIG. 2 is a cross-sectional view of a consolidable device according to the invention;
FIG. 3 is a schematic structural view of a three-axis sample mold according to the present invention;
FIG. 4 is a flow chart of the present invention;
FIG. 5 is a graph of the percent of particles according to the present invention.
In the figure: 1-support, 2-pressure device, 3-mould, 4-workbench, 5-controller, 6-jack, 7-pressure hammer, 8-graduated scale, 9-cover plate, 10-top plate, 11-fixing bolt, 12-heightening cylinder, 13-arc template, 14-hoop, 15-base, 16-bottom bolt, 17-pressure display, 18-control power supply and 19-support rod.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The embodiment of the invention is realized by the mudstone remodeling method based on the microscopic topography image analysis, which comprises the following steps of:
s1: obtaining the original-state mudstone on site, carrying out a basic physical mechanical test, and obtaining the density, the water content, the strength (sigma c, g,
) And deformation parameters (E, v);
s2: carrying out X-ray diffraction analysis and test to obtain the composition and content information of the undisturbed mudstone;
s3: obtaining an original-state mudstone micro-morphology image by using a polarizing microscope, processing and analyzing to obtain rock grain grading characteristics and determining the cementing type: firstly, acquiring a plurality of groups of mudstone micro-topography images at different amplification speeds, such as 40 times, 100 times, 200 times and 500 times; secondly, guiding the image into PACS software, and obtaining the geometric information of the image through binarization segmentation and pore crack repair; then introducing the geometric information into Excel to calculate the area of all particles in each particle size range, and dividing the area by the total area of the image to multiply by 100% to obtain the percentage content of the particles in the corresponding particle size range; finally, referring to fig. 5, the percentage content of the particles is used as a vertical coordinate, the magnification factor is used as a horizontal coordinate, a scatter diagram is drawn and fitted, and the percentage content of intercept points of a fitted line on the vertical coordinate is adopted for sample preparation (namely, a true value, the result is closer to the actual situation because the smaller the magnification factor is, the more the sample points are observed, and the intercept points represent the true size of the sample points, namely, the corresponding percentage content of the particles is the true value);
s4: selecting an added cementing material according to the cementing material components of the undisturbed mudstone and the material composition components thereof, and designing a group of cementing material adding proportion, such as calcareous cementation and lime addition, wherein the adding proportion is 2%, 4%, 6% and the like;
s5: obtaining on-site debris of the mudstone, drying and crushing the debris, and then carrying out a screening test;
s6: calculating the overlying formation pressure of the undisturbed mudstone to determine the applied pressure during sample preparation;
s7: according to the mixing proportion of the cementing material and the density, the water content and the particle size distribution characteristics of undisturbed mudstone, determining the mass of the cementing material required by remolding a mudstone sample and the mass and the water demand of the mudstone within each particle size range (such as less than 0.075mm), weighing all required substances, placing the substances into a container, mixing and uniformly stirring the substances, sealing the container by using a preservative film, and standing for 2 hours to fully diffuse water;
s8: inserting three arc-shaped templates 13 into a groove of a base 15, sleeving a hoop 14 on the assembled three arc-shaped templates 13 to complete assembly of a mold 3, then placing the mold 3 on a workbench 4, fixing the base 15 through a bottom bolt 16 to fix the mold 3, adding a prepared mudstone mixture into the mold 3 five times, applying consolidation pressure through a pressure device 2 arranged at the top of a support 1 to prepare a sample, after the sample preparation is completed, sealing and maintaining the sample for 1 day with the mold, removing the mold, sealing and maintaining the sample for 7 days, and removing the mold to obtain remolded mudstone;
s9: obtaining a micro-morphology image of the remolded mudstone by using a polarizing microscope, and analyzing and determining the cementing type of the remolded mudstone;
s10: selecting remolded mudstone with the cementing type similar to that of the original mudstone, and carrying out the indoor triaxial compression and uniaxial compression strength tests of the remolded mudstone to obtain the strength (sigma c, c,
) And deformation parameters (E, v) and comparing with the parameters of the undisturbed rock sample;
s11: if the difference between the parameters of the remolded mudstone and the undisturbed mudstone is large in S10, repeating the operations from S4 to S10 until a group of sigmac, c,
E. V and sigma c, c of undisturbed rock sample,
E. And v, until a group of remolded mudstone is close, and carrying out subsequent tests by using the group of remolded mudstone cementing materials and the mixing proportion thereof.
Referring to fig. 1 and 3, in S8, a consolidation device is used for preparing the remolded mudstone, and the consolidation device comprises a support 1, a pressure device 2, a mould 3, a workbench 4 and a controller 5; the bracket 1 consists of a cover plate 9, a top plate 10 and a support rod 19; the pressure device 2 consists of a jack 6, a pressure hammer 7 and a graduated scale 8; the mould 3 consists of an arc-shaped template 13, a hoop 14, a base 15 and a heightening cylinder 12; the controller 5 is composed of a control power supply 18 and a pressure display 17.
Referring to fig. 2 and 3, the jack 6 is fixed between the top plate 10 and the cover plate 9 of the bracket 1 by a fixing bolt 11; the pressure hammer 7 with the graduated scale 8 is connected with the jack 6; the die 3 is fixed on the workbench 4 through a bottom bolt 16, and the arc-shaped template 13 is arranged on the base 15 and fixed by a hoop 14; the bottom of the heightening cylinder 12 is provided with a groove which is inserted into the groove above the assembled arc-shaped template 13; wherein the working table 4 and the top plate 10 are respectively welded with four support rods 19.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. A mudstone remodeling method based on microscopic morphology image analysis is characterized by comprising the following steps:
s1, obtaining the on-site undisturbed mudstone, carrying out the basic physical mechanical test, and obtaining the density, the water content and the strength of the undisturbed mudstone
And deformation parameters (E, v);
s2, carrying out X-ray diffraction analysis and test to obtain the composition and content information of the undisturbed mudstone;
s3, obtaining the micro-morphology image of the undisturbed mudstone by using a polarizing microscope, processing and analyzing to obtain the particle grading characteristics of the undisturbed mudstone and determining the cementation type of the undisturbed mudstone;
s4, selecting the added gel material according to the cementing material component and the material component of the undisturbed mudstone, designing a group of gel material adding proportion,
s5, obtaining on-site debris of the mudstone, drying and crushing the debris, and then performing a screening test;
s6, calculating the overburden pressure of the undisturbed mudstone to determine the pressure applied during sample preparation;
s7, preparing a mixture of mudstone particles, water and a cementing material within each particle size range;
s8, preparing remolded mudstone, and consolidating under the pressure of an overlying stratum;
s9, obtaining a micro-morphology image of the remolded mudstone by using a polarizing microscope, and analyzing and determining the cementing type of the remolded mudstone;
s10, selecting remolded mudstones with the cementing types consistent with those of original mudstones, carrying out original indoor triaxial compression and uniaxial compressive strength tests on the remolded mudstones, and obtaining the strength index of the remolded mudstones
And deformation parameters (E, v) and comparing with the parameters of the undisturbed mudstone; developing the indoor triaxial compression and uniaxial compression tests of the remolded mudstone to obtain the strength index of the remolded mudstone
And deformation parameters (E, v) and comparing with the parameters of the undisturbed mudstone;
s11, if the difference between the related parameters of the remolded mudstone and the undisturbed mudstone in the S10 is large, repeating the operations from S4 to S10 until a group of sigmac, c,
E. V and sigma c, c of undisturbed mudstone,
E. And v, until a group of remolded mudstone is close, and taking the mixing proportion of the group of remolded mudstone cementing materials as the remolded mudstone mixing proportion.
2. A mudstone remodeling method based on micro-topographic image analysis according to claim 1, wherein the development polarization microscope slice in S3 is made by: and (3) making a plurality of groups of parallel samples, acquiring original-state mudstone morphology images under multiple times, distinguishing particle sizes according to the maximum length of particles due to the irregular shape of the particles, and obtaining the particle grading of the original-state mudstone through image processing analysis.
3. A mudstone remodeling method based on micro-topographic image analysis according to claim 1 or 2, wherein the grain grading characteristics in S3 are obtained as follows: the method comprises the steps of firstly solving the content of particles in each particle size range under each multiple, then drawing a scatter diagram and fitting the scatter diagram by taking the percentage content of the particles as a vertical coordinate and the magnification factor as a horizontal coordinate, and selecting the percentage content of the mudstone particles with the intercept on the vertical coordinate as the corresponding particle size range when the mudstone is remolded.
4. A mudstone remodeling method based on microscopic topographic image analysis according to claim 1, wherein the determination of the cementing material in S4 is: the cementing material is determined according to the material composition and cementing type of the undisturbed mudstone, and the original material composition of the mudstone is not changed.
5. A mudstone remodeling method based on micro-topography image analysis according to claim 1, wherein in S8, a consolidation device is adopted for mudstone remodeling, the consolidation device comprises a bracket, a pressure device, a mold, a workbench and a controller, when mudstone remodeling is carried out, the mold is assembled, vaseline is coated on the inner side of the arc-shaped template, then the arc-shaped template is arranged on a base, and a hoop is sleeved on the arc-shaped template; fixing the assembled die on a workbench through a die base by using a bottom bolt; and opening a control power supply, setting consolidation pressure equal to the pressure of an overlying stratum of the undisturbed mudstone by using a pressure controller, applying consolidation pressure to the mudstone mixture in the mould through a pressure hammer which is arranged between a support top plate and a cover plate and is connected with a jack and provided with a scale until the scale reaches/locates to finish the sample preparation of a first layer, roughening the surface of the sample, repeating the operation, sleeving a heightening sleeve above the mould before adding the mudstone mixture for the last time, and then applying pressure to finish the sample preparation process.
6. A mudstone remodeling method based on micro-topography image analysis according to claim 5, wherein a graduated scale capable of directly reading the height of the sample is arranged on the pressure hammer of the consolidation apparatus.
7. A mudstone remodeling method based on micro-topographic image analysis as claimed in claim 1, wherein the grain composition characteristics, mineral composition, cementing type and composition, density, water content and overburden pressure effect of undisturbed mudstone are considered in combination in said S1-S9.
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| CN114791483A (en) * | 2022-04-01 | 2022-07-26 | 四川大学 | Rock mechanical behavior testing and analyzing method based on simulated deep in-situ sample |
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| WO2017024701A1 (en) * | 2015-08-11 | 2017-02-16 | 深圳朝伟达科技有限公司 | Method for preparing drill core |
| CN112051389A (en) * | 2020-07-21 | 2020-12-08 | 中煤科工集团重庆研究院有限公司 | Preparation material for remolding coal series mud rock sample and batch preparation method thereof |
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| CN114791483A (en) * | 2022-04-01 | 2022-07-26 | 四川大学 | Rock mechanical behavior testing and analyzing method based on simulated deep in-situ sample |
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