CN115060564B - Method for manufacturing stack remolded sample by considering framework structure characteristics - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 239000011148 porous material Substances 0.000 claims abstract description 45
- 239000004927 clay Substances 0.000 claims abstract description 13
- 238000002360 preparation method Methods 0.000 claims abstract description 8
- 238000012360 testing method Methods 0.000 claims abstract description 8
- 239000010419 fine particle Substances 0.000 claims description 24
- 238000005303 weighing Methods 0.000 claims description 24
- 239000002689 soil Substances 0.000 claims description 18
- 239000011362 coarse particle Substances 0.000 claims description 14
- 239000011800 void material Substances 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000012545 processing Methods 0.000 claims description 11
- 238000007634 remodeling Methods 0.000 claims description 10
- 238000002474 experimental method Methods 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 6
- 238000005464 sample preparation method Methods 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 6
- 238000005056 compaction Methods 0.000 claims description 4
- 238000012669 compression test Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000011049 filling Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000007788 roughening Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 230000000007 visual effect Effects 0.000 claims description 3
- 238000009826 distribution Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000035515 penetration Effects 0.000 abstract description 2
- 239000004575 stone Substances 0.000 description 9
- 239000000203 mixture Substances 0.000 description 3
- 230000005484 gravity Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005325 percolation Methods 0.000 description 1
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- 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
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- 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
- G01N1/36—Embedding or analogous mounting of samples
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- 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
- G01N1/36—Embedding or analogous mounting of samples
- G01N2001/366—Moulds; Demoulding
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Abstract
The invention relates to a method for manufacturing a stack remolded sample taking framework structure characteristics into consideration, which comprises the following steps: acquiring an undisturbed stack sample and parameters thereof; dividing the loose stack sample into coarse grains and fine grains, and obtaining the content of sticky grains, the content of fine grains, the grading parameter of coarse grains and the framework pore ratio; preparing a remolded stack body sample, and controlling the framework pore ratio, the clay content, the fine grain content and the coarse grain grading parameters of the remolded stack body in the preparation process. The beneficial effects of the invention are as follows: according to the invention, the framework pore ratio, the clay content and the coarse grain grading parameters of the remolded stack sample are controlled, so that the pore characteristics of the undisturbed stack and the coarse grain distribution condition serving as the framework are better reduced, and the problem of poor accuracy of the results of the remolded stack sample after the strength and penetration test are carried out is solved.
Description
Technical Field
The invention relates to the field of geotechnical mechanical tests, in particular to a method for manufacturing a pile body remolded sample by considering skeleton structure characteristics.
Background
The soil-stone mixture is an extremely inhomogeneous loose rock-soil medium system which is composed of a block stone with a certain engineering scale and higher strength, a fine soil body and pores and has a certain stone content. The stacked body (a mixture of clay, powdery clay, crushed stone, and lump stone, etc. combined in a certain ratio) has the property of a mixture of clay and stone. The pile is characterized by high content of stone blocks and broken stones as coarse grains, and plays a role of a framework when being stressed. The mechanical, percolation properties of the stack depend on its pore structure and the location, content, etc. of the coarse particles. The stacking weight plastic samples in the indoor test are all main indexes of the overall void ratio e (dry density), coarse grains, fine grains and water are mixed and then are sampled directly according to the target water content, the fine grains and the coarse grains are not separately configured, and the prepared remolded samples can not reflect the real stress state in the soil-stone stacking body. Even if the overall pore ratio of the remolded sample meets the design requirement, the indexes such as strength, modulus and the like of the remolded sample can not meet the requirement, and the difference between the distribution condition of coarse and fine particles and the original state of the remolded sample is larger.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a method for manufacturing a stacked body remolded sample taking framework structure characteristics into consideration, which comprises the following steps:
S1, acquiring an undisturbed stack sample;
S2, carrying out a basic physical and mechanical test of the undisturbed stack sample to obtain dry density, void ratio, water content and strength parameters of the undisturbed stack sample, wherein the strength parameters comprise a first cohesion c 1 and a first internal friction angle
S3, obtaining a loose stack sample, drying the loose stack sample, screening the loose stack sample into coarse grains larger than a grain size threshold value and fine grains smaller than the grain size threshold value, further screening the fine grains to obtain sticky grains smaller than 0.075mm, obtaining the sticky grain content and the fine grain content f c (both of which are percentages of the total mass of the stack) of the loose stack sample, and obtaining grading parameters of the coarse grains, wherein the grading parameters of the coarse grains comprise a first curvature coefficient C c1 and a first non-uniformity coefficient C u1;
S4, carrying out a stacking experiment of the loose stacked body sample to obtain a relation between the unit pore volume increment a and the fine particle content f c, wherein the formula is as follows:
eM＝(a-1-ec)fc+ec
a＝m1fc+m2
Where e M is the minimum pore ratio of the loose packed sample, e c is the pore ratio of coarse particles per se, and m 1 and m 2 are fitting coefficients;
s5, obtaining a skeleton pore ratio e sk in the remodelling process, wherein the formula is as follows:
Wherein e is the void ratio of the loose-packed sample;
S6, preparing a remolded stack body sample by adopting a layered sample preparation method, and controlling the framework pore ratio, the clay content, the fine grain content f c and the coarse grain grading parameters of the remolded stack body in the preparation process;
S7, carrying out an indoor triaxial compression test of the remolded stack body sample to obtain strength indexes of the remolded stack body sample, wherein the strength indexes comprise a second cohesive force c 2 and a second internal friction angle And comparing the intensity parameter with the intensity parameter of the undisturbed stack sample;
S8, if the difference between the strength index of the remolded stack sample and the strength parameter of the undisturbed stack sample is greater than a difference threshold, adjusting the parameters until c 2 in the strength index is selected, C 1 and c 1 of the as-deposited body sampleUntil a set of remolded stack samples differing by less than a difference threshold, and taking the skeletal pore ratio and the clay content of the set of remolded stack samples as reference indicators at the time of remolding.
Preferably, in S4, the performing a stacking experiment of the loose stacked body sample includes:
s401, designing a plurality of groups of fine particles with different amounts, uniformly mixing the fine particles with coarse particles, and obtaining a plurality of groups of loose stack body samples with different fine particle contents;
S402, respectively measuring the minimum pore ratio of loose stacked bodies under different fine particle contents;
S403, drawing coordinate points in a rectangular coordinate system by taking the content percentage of fine particles as an abscissa and the minimum pore ratio of a stacking body as an ordinate, and fitting by adopting a smooth quadratic curve.
Preferably, in S6, the preparing of the remolded stack sample by the layered sample preparation method includes:
s601, preparing dried and screened coarse grain and fine grain soil according to the values of the porosity ratio and the sticky grain content of the original stacked body sample skeleton, respectively adding water with corresponding mass according to the water content of coarse grain and fine grain, uniformly stirring, sealing and standing for more than 24 hours;
S602, selecting coarse grains meeting coarse grain grading parameters of a loose stack sample through a digital image processing device, and obtaining the quality of coarse grains with various required grain diameters;
s603, calculating to obtain the quality of the required fine soil according to a skeleton pore ratio formula;
S604, during remodeling, firstly filling coarse-grained soil into a sample preparation mould in a layering manner, uniformly spraying fine-grained soil into the coarse-grained soil in a layering manner, and enabling a remolded stack sample to reach the dry density of an original stack sample by using a vibrating table or a compaction device;
s605, roughening the surface of the remolded stack body sample, and repeating the operation until the remolded stack body sample reaches the size meeting the experimental requirements.
Preferably, in S602, the digital image processing apparatus includes a computer 1, a camera 2, a weighing device 3, and a bracket 4, wherein the camera 2 and the weighing device 3 are mounted on the bracket 4, and the camera 2 and the computer 1 are connected.
Preferably, S602 includes:
S6021, adjusting the angle of the camera 2 to enable the lens of the camera to be aligned to the position right above the weighing device 3;
s6022, placing a certain amount of coarse grains on the weighing device 3;
s6023, displaying and image processing the picture of the camera 2 through the computer 1 connected with the camera 2, and obtaining a second curvature coefficient C c2 and a second non-uniformity coefficient C u2 of coarse grains on the weighing device 3;
S6024, adjusting coarse grains on the weighing device 3 until the second curvature coefficient C c2 and the second non-uniformity coefficient C u2 meet the first curvature coefficient C c1 and the first non-uniformity coefficient C u1 of the loose stack sample;
S6025, calculating and adjusting the mass of coarse particles on the weighing device 3.
Preferably, in S8, if the second internal friction angle of the stacked body sample is remoldedLess than the first internal friction angle/>, of the as-deposited bulk sampleReturning to S6, and increasing the skeleton pore ratio during remodeling; if the second internal friction angle/>, of the stack sample is remoldedGreater than the first internal friction angle/>, of the as-deposited bulk sampleReturning to S6, the scaffold void ratio is reduced upon remodeling.
Preferably, in S8, if the second cohesion c 2 of the remolded stack sample is smaller than the first cohesion c 1 of the as-is stack sample, returning to S6, and increasing the percentage of the cosmid content at the time of remolding; if the second cohesion c 2 of the remodeled stack sample is greater than the first cohesion c 1 of the as-is stack sample, return to S6, reduce the percent of cosmid content upon remodelling.
Preferably, in S6023, a graphical interface program is written based on the computer graphic visual library open-cv, the image is binarized by the color difference between the coarse grains and the background, the contour of each coarse grain is identified by a contour detection algorithm, the diameter of each contour is calculated and counted, and the second curvature coefficient C c2 and the second unevenness coefficient C u2 of the coarse grains on the weighing device 3 are calculated.
The beneficial effects of the invention are as follows: according to the invention, the framework pore ratio, the clay content and the coarse grain grading parameters of the remolded stack sample are controlled, so that the pore characteristics of the undisturbed stack and the coarse grain distribution condition serving as the framework are better reduced, and the problem of poor accuracy of the results of the remolded stack sample after the strength and penetration test are carried out is solved.
Drawings
FIG. 1 is a flow chart of a method for fabricating a stack remolded sample taking into account skeletal structure characteristics in accordance with the present application;
FIG. 2 is a schematic representation of a fitted curve of fines content and minimum pore ratio of the heap provided by the present application;
FIG. 3 is a schematic diagram of a digital image processing apparatus according to the present application;
Reference numerals illustrate: computer 1, camera 2, weighing device 3, support 4.
Detailed Description
The invention is further described below with reference to examples. The following examples are presented only to aid in the understanding of the invention. It should be noted that it will be apparent to those skilled in the art that modifications can be made to the present invention without departing from the principles of the invention, and such modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Example 1:
In order to solve the problem that the gap between the coarse and fine particle distribution condition and the original state of a remolded sample in the prior art is larger, the invention provides a manufacturing method of a remolded sample of a stack body, which considers the characteristics of a skeleton structure, and in addition to meeting the indexes of the porosity and the water content considered in the prior art during remolding, the parameters of the skeleton porosity, the content of sticky particles and the coarse grain grading are controlled so as to prepare the remolded stack body sample which is relatively close to the skeleton structure and the macroscopic strength of the original stack body, as shown in figure 1, the method comprises the following steps:
s1, obtaining an undisturbed stack sample.
In S1, a worker can acquire a certain amount of undisturbed stack in the field as an undisturbed stack sample at the experimental site.
S2, performing a basic physical and mechanical test of the undisturbed stack sample to obtain dry density, void ratio, water content and strength parameters of the undisturbed stack sample, wherein the strength parameters comprise a first cohesion c 1 and a first internal friction angle
Illustratively, in S2, the soil sample is dried and then weighed to obtain its moisture content; carrying out a specific gravity experiment to obtain the specific gravity of the bulk; the undisturbed stack obtained from the 30X 30cm container was weighed, to obtain its dry density and void ratio; and performing a triaxial compression experiment to obtain the strength parameters.
S3, obtaining a loose packed body sample, drying and screening the loose packed body sample, dividing the loose packed body sample into coarse grains larger than a grain size threshold value and fine grains smaller than the grain size threshold value, further screening the fine grains to obtain sticky grains smaller than 0.075mm, obtaining the sticky grain content and the fine grain content f c (both of which are percentages of the total mass of the packed body) of the loose packed body sample, and obtaining grading parameters of the coarse grains, wherein the grading parameters of the coarse grains comprise a first curvature coefficient C c1 and a first non-uniformity coefficient C u1.
In S3, the particle size threshold may be 2mm.
S4, carrying out a stacking experiment of a loose stack sample to obtain a relation between the unit pore volume increment a and the fine particle content f c, wherein the formula is as follows:
eM＝(a-1-ec)fc+ec
a＝m1fc+m2
Where e M is the minimum void ratio of the loose packed sample, e c is the void ratio of coarse particles themselves packed, and m 1 and m 2 are fitting coefficients.
S4, carrying out a stacking experiment of loose stack samples, wherein the stacking experiment comprises the following steps:
S401, designing a plurality of groups of fine particles with different amounts, uniformly mixing the fine particles with coarse particles, and obtaining a plurality of groups of loose stack body samples with different fine particle contents.
S402, respectively measuring the minimum pore ratio of loose stacked bodies under different fine particle contents; for example, the different fines content may include 0%, 5%, 10%, 15%, etc.
When fine particles are added into a structure taking coarse particles as a framework, the coarse particle framework is slightly stretched, the pore volume increase caused by stretching the coarse particle framework by adding fine particles in unit volume is represented by a, and under the condition that the particle material and the grading are unchanged, the value a is in direct proportion to the content of the added fine particles.
S403, as shown in fig. 2, drawing each coordinate point in a rectangular coordinate system by taking the content percentage of fine particles as an abscissa and the minimum pore ratio of a stacked body as an ordinate, and fitting by adopting a smooth quadratic curve. Further, a relational expression between the pore volume increase amount a and the fine particle content f c can be obtained.
S5, obtaining a skeleton pore ratio e sk in the remodelling process, wherein the formula is as follows:
Wherein e is the void ratio of the loose-packed sample;
the invention introduces the skeleton pore ratio index, reflects the compaction degree of skeleton particles of the pile body sample bearing external force, and the higher the skeleton pore ratio is, the more compact the particle group serving as the skeleton is, the higher the pile body strength and deformation modulus are.
S6, preparing a remolded stack body sample by adopting a layered sample preparation method, and controlling the framework pore ratio, the clay content, the fine grain content f c and the coarse grain grading parameters of the remolded stack body in the preparation process.
S6, preparing a remolded stack body sample by adopting a layering sample preparation method, wherein the method comprises the following steps of:
s601, preparing dried and screened coarse grain and fine grain soil according to the values of the porosity ratio and the sticky grain content of the original stacked body sample skeleton, respectively adding water with corresponding mass according to the water content of coarse grain and fine grain, uniformly stirring, sealing and standing for more than 24 hours;
S602, selecting coarse grains meeting coarse grain grading parameters of a loose stack sample through a digital image processing device, and calculating the quality of coarse grains with all required grain diameters;
s603, calculating to obtain the quality of the required fine soil according to a skeleton pore ratio formula;
s604, during remodeling, firstly filling coarse-grained soil into a sample preparation mould in a layering manner, uniformly spraying fine-grained soil into the coarse-grained soil in a layering manner, and enabling a remolded stack sample to reach the dry density of an original stack sample by using tools such as a vibrating table or a compaction device;
s605, roughening the surface of the remolded stack body sample, and repeating the operation until the remolded stack body sample reaches the size meeting the experimental requirements.
In addition, throughout the process of S6, it is necessary to keep the current ambient temperature and humidity constant and to complete the preparation of the remolded test sample in a continuous period of time.
In S602, as shown in fig. 3, the digital image processing apparatus includes a computer 1, a camera 2, a weighing device 3, and a bracket 4, wherein the camera 2 and the weighing device 3 are mounted on the bracket 4, and the camera 2 is connected with the computer 1.
Specifically, S602 includes:
S6021, adjusting the angle of the camera 2 to enable the lens of the camera to be aligned to the position right above the weighing device 3;
s6022, placing a certain amount of coarse grains on the weighing device 3;
s6023, displaying and image processing the picture of the camera 2 through the computer 1 connected with the camera 2, and obtaining a second curvature coefficient C c2 and a second non-uniformity coefficient C u2 of coarse grains on the weighing device 3;
In S6023, the principle of image processing is: based on a computer graphic visual library open-cv programming graphical interface program, binarizing the image by using the color difference of coarse grains and the background, identifying each coarse grain contour by using a contour detection algorithm, calculating the diameter of each contour and counting, thereby calculating a second curvature coefficient C c2 and a second non-uniformity coefficient C u2.
S6024, adjusting coarse grains on the weighing device 3 until the second curvature coefficient C c2 and the second non-uniformity coefficient C u2 meet the first curvature coefficient C c1 and the first non-uniformity coefficient C u1 of the loose stack sample;
S6025, calculating and adjusting the mass of coarse particles on the weighing device 3.
S7, performing an indoor triaxial compression test of the remolded stack body sample to obtain strength indexes of the remolded stack body sample, wherein the strength indexes comprise a second cohesive force c 2 and a second internal friction angleAnd compared with the strength parameter of the as-formed stack sample.
S8, if the difference between the strength index of the remolded stack sample and the strength parameter of the original stack sample is larger than a difference threshold value, adjusting the parameters until c 2 in the strength index is selected,C 1 and/>, with the as-deposited bulk sampleUntil a set of remolded stack samples differing by less than a difference threshold, and taking the skeletal pore ratio and the clay content of the set of remolded stack samples as reference indicators at the time of remolding.
In S8, the present invention may select an appropriate difference threshold as needed, for example, the difference threshold may be 0, that is, if the second internal friction angle of the stack sample is remoldedLess than the first internal friction angle/>, of the as-deposited bulk sampleReturning to S6, and increasing the skeleton pore ratio during remodeling; if the second internal friction angle/>, of the stack sample is remoldedGreater than the first internal friction angle/>, of the as-deposited bulk sampleReturning to S6, the scaffold void ratio is reduced upon remodeling.
As another example, if the second cohesion c 2 of the remolded bulk sample is less than the first cohesion c 1 of the as-is bulk sample, returning to S6, increasing the percent of the cosmid content upon remolding; if the second cohesion c 2 of the remodeled stack sample is greater than the first cohesion c 1 of the as-is stack sample, return to S6, reduce the percent of cosmid content upon remodelling.
In summary, in the method for manufacturing the stack body remolded sample taking the framework structure characteristics into consideration, the indexes such as the pore ratio, the dry density and the water content considered in the traditional method are met, and the framework pore ratio, the clay content and the coarse grain grading parameters are controlled, so that the macroscopic strength of the remolded sample is close to that of an original sample, the pore characteristics of the original stack body and the coarse grain distribution condition serving as the framework are better reduced, and the problem that the macroscopic strength index of the sample prepared by the traditional remolded method does not meet the requirement is solved.
Claims (8)
1. A method for producing a stacked body remolded sample in consideration of a skeletal structure characteristic, comprising:
S1, acquiring an undisturbed stack sample;
S2, carrying out a basic physical and mechanical test of the undisturbed stack sample to obtain dry density, void ratio, water content and strength parameters of the undisturbed stack sample, wherein the strength parameters comprise a first cohesion c 1 and a first internal friction angle
S3, obtaining a loose stack sample, drying the loose stack sample, screening the loose stack sample, dividing the loose stack sample into coarse grains larger than a grain size threshold value and fine grains smaller than the grain size threshold value, further screening the fine grains to obtain sticky grains smaller than 0.075mm, obtaining the sticky grain content and the fine grain content f c of the loose stack sample, and obtaining the grading parameters of the coarse grains, wherein the grading parameters of the coarse grains comprise a first curvature coefficient C c1 and a first non-uniformity coefficient C u1;
S4, carrying out a stacking experiment of the loose stacked body sample to obtain a relation between the unit pore volume increment a and the fine particle content f c, wherein the formula is as follows:
eM＝(a-1-ec)fc+ec
a＝m1fc+m2
Where e M is the minimum pore ratio of the loose packed sample, e c is the pore ratio of coarse particles per se, and m 1 and m 2 are fitting coefficients;
s5, obtaining a skeleton pore ratio e sk in the remodelling process, wherein the formula is as follows:
Wherein e is the void ratio of the loose-packed sample;
S6, preparing a remolded stack body sample by adopting a layered sample preparation method, and controlling the framework pore ratio, the clay content, the fine grain content f c and the coarse grain grading parameters of the remolded stack body in the preparation process;
S7, carrying out an indoor triaxial compression test of the remolded stack body sample to obtain strength indexes of the remolded stack body sample, wherein the strength indexes comprise a second cohesive force c 2 and a second internal friction angle And comparing the intensity parameter with the intensity parameter of the undisturbed stack sample;
S8, if the difference between the strength index of the remolded stack sample and the strength parameter of the undisturbed stack sample is greater than a difference threshold, adjusting the parameters until c 2 in the strength index is selected, C 1 and/>, with the as-deposited bulk sampleUntil a set of remolded stack samples differing by less than a difference threshold, and taking the skeletal pore ratio and the clay content of the set of remolded stack samples as reference indicators at the time of remolding.
2. The method for preparing a stacked body remolded sample taking into account skeletal structure characteristics as recited in claim 1, wherein in S4, said performing a stacking experiment of the loose stacked body sample comprises:
s401, designing a plurality of groups of fine particles with different amounts, uniformly mixing the fine particles with coarse particles, and obtaining a plurality of groups of loose stack body samples with different fine particle contents;
S402, respectively measuring the minimum pore ratio of loose stacked bodies under different fine particle contents;
S403, drawing coordinate points in a rectangular coordinate system by taking the content percentage of fine particles as an abscissa and the minimum pore ratio of a stacking body as an ordinate, and fitting by adopting a smooth quadratic curve.
3. The method for preparing a remolded sample of a stacked body taking into consideration skeletal structure characteristics as recited in claim 1, wherein in S6, the preparing a remolded stacked body sample by a layered sample preparation method comprises:
s601, preparing dried and screened coarse grain and fine grain soil according to the values of the porosity ratio and the sticky grain content of the original stacked body sample skeleton, respectively adding water with corresponding mass according to the water content of coarse grain and fine grain, uniformly stirring, sealing and standing for more than 24 hours;
S602, selecting coarse grains meeting coarse grain grading parameters of a loose stack sample through a digital image processing device, and obtaining the quality of coarse grains with various required grain diameters;
s603, calculating to obtain the quality of the required fine soil according to a skeleton pore ratio formula;
S604, during remodeling, firstly filling coarse-grained soil into a sample preparation mould in a layering manner, uniformly spraying fine-grained soil into the coarse-grained soil in a layering manner, and enabling a remolded stack sample to reach the dry density of an original stack sample by using a vibrating table or a compaction device;
s605, roughening the surface of the remolded stack body sample, and repeating the operation until the remolded stack body sample reaches the size meeting the experimental requirements.
4. The method for producing a stacked body remolded sample taking into account skeletal structure features as claimed in claim 3, wherein in S602, said digital image processing apparatus comprises a computer (1), a camera (2), a weighing device (3) and a bracket (4), wherein said camera (2) and said weighing device (3) are mounted on said bracket (4), and said camera (2) is connected to said computer (1).
5. The method for producing a stacked body remodeling sample taking account of skeletal structure characteristics according to claim 4, wherein S602 comprises:
s6021, adjusting the angle of the camera (2) to enable the lens of the camera to be aligned to the position right above the weighing device (3);
s6022, placing a certain amount of coarse grains on a weighing device (3);
S6023, displaying and image processing the picture of the camera (2) through a computer (1) connected with the camera (2), and acquiring a second curvature coefficient C c2 and a second non-uniformity coefficient C u2 of coarse grains on the weighing device (3);
S6024, adjusting coarse grains on the weighing device (3) until the second curvature coefficient C c2 and the second non-uniformity coefficient C u2 meet the first curvature coefficient C c1 and the first non-uniformity coefficient C u1 of the loose stack sample;
s6025, calculating and adjusting the mass of coarse grains on the weighing device (3).
6. The method for producing a stacked body remolded sample taking into consideration skeletal structure characteristics as set forth in claim 1, wherein in S8, if the second internal friction angle of the stacked body sample is remoldedLess than the first internal friction angle/>, of the as-deposited bulk sampleReturning to S6, and increasing the skeleton pore ratio during remodeling; if the second internal friction angle/>, of the stack sample is remoldedGreater than the first internal friction angle/>, of the as-deposited bulk sampleReturning to S6, the scaffold void ratio is reduced upon remodeling.
7. The method for producing a remolded sample of a stacked body in consideration of skeletal structure characteristics as claimed in claim 1, wherein in S8, if the second cohesion c 2 of the remolded stacked body sample is smaller than the first cohesion c 1 of the as-is stacked body sample, returning to S6, and increasing the percentage of the amount of the cohesive particles upon remolding; if the second cohesion c 2 of the remodeled stack sample is greater than the first cohesion c 1 of the as-is stack sample, return to S6, reduce the percent of cosmid content upon remodelling.
8. The method for producing a stacked body remolded sample taking into account skeletal structure features as set forth in claim 5, wherein in S6023, a graphical interface program is written based on a computer graphic visual library open-cv, images are binarized from color differences of coarse grains and background, contours of each coarse grain are identified by a contour detection algorithm, diameters of the contours are calculated and counted, and a second curvature coefficient C c2 and a second non-uniformity coefficient C u2 of the coarse grains on the weighing device (3) are calculated.
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| CN202210782976.3A CN115060564B (en) | 2022-07-01 | 2022-07-01 | Method for manufacturing stack remolded sample by considering framework structure characteristics |
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| CN115060564B true CN115060564B (en) | 2024-05-10 |
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| CN103487304A (en) * | 2013-10-08 | 2014-01-01 | 长沙理工大学 | Method for manufacturing remodeled sample of soil-rock mixture |
| RU2503776C1 (en) * | 2012-07-23 | 2014-01-10 | Открытое акционерное общество "Всероссийский научно-исследовательский институт гидротехники имени Б.Е. Веденеева" | Method to assess content of macrofragmental inclusions to characteristics of compressibility of mixtures of clayey soils |
| CN110296925A (en) * | 2019-07-08 | 2019-10-01 | 西南交通大学 | A kind of coarse-grained soil osmotic coefficient investigating method considering permeameter wall effect |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2503776C1 (en) * | 2012-07-23 | 2014-01-10 | Открытое акционерное общество "Всероссийский научно-исследовательский институт гидротехники имени Б.Е. Веденеева" | Method to assess content of macrofragmental inclusions to characteristics of compressibility of mixtures of clayey soils |
| CN103487304A (en) * | 2013-10-08 | 2014-01-01 | 长沙理工大学 | Method for manufacturing remodeled sample of soil-rock mixture |
| CN110296925A (en) * | 2019-07-08 | 2019-10-01 | 西南交通大学 | A kind of coarse-grained soil osmotic coefficient investigating method considering permeameter wall effect |
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| 土石混合介质堆积体力学特性试验研究;杨继红;齐丹;郑珠光;李严威;王闯;;华北水利水电大学学报(自然科学版);20160615(03);全文 * |
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