CN113297718B - Coarse particle material block system generation method and device, storage medium and equipment - Google Patents

Coarse particle material block system generation method and device, storage medium and equipment Download PDF

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CN113297718B
CN113297718B CN202110360417.9A CN202110360417A CN113297718B CN 113297718 B CN113297718 B CN 113297718B CN 202110360417 A CN202110360417 A CN 202110360417A CN 113297718 B CN113297718 B CN 113297718B
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coarse
particles
block system
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particle
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CN113297718A (en
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徐栋栋
林绍忠
程展林
卢波
邬爱清
汪斌
潘家军
王奔
胡伟
向前
刘小红
曾平
王复兴
周跃峰
江洎洧
付晖
衣天宇
王瑾
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Changjiang River Scientific Research Institute Changjiang Water Resources Commission
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Abstract

The application discloses a coarse aggregate block system generation method, a coarse aggregate block system generation device, a storage medium and equipment, and belongs to the field of rock and soil mechanics numerical calculation. The method comprises the following steps: establishing a basic form database of coarse granule particles; randomly generating coarse grain particles in the area of the coarse grain block system to be generated, so that the total area of the coarse grain particles is strictly equal to the total area of the coarse grain block sample to be generated; randomly and uniformly throwing the coarse granular particles into a set random throwing model; forming a discontinuous deformation analysis program of compaction and free fall of the randomly thrown model; carrying out compaction operation, and extracting a compaction model obtained by the compaction operation; deleting the loading plate, the bottom constraint plate, the left constraint plate and the right constraint plate to obtain a compacted coarse aggregate model; a restriction is applied around the compacted coarse particle pattern to obtain a coarse particle mass system. The apparatus, storage medium, and device can implement the method. It can obtain the coarse grain lump block system that strictly satisfies the gradation requirement.

Description

Coarse particle material block system generation method and device, storage medium and equipment
Technical Field
The invention relates to the field of rock-soil mechanics numerical calculation, in particular to a coarse granular material block system generation method, a coarse granular material block system generation device, a coarse granular material block system storage medium and coarse granular material block system equipment.
Background
Coarse particles are generally non-viscous mixtures of coarse particles such as stones, crushed stones, gravel, sand, etc. The coarse aggregate has the advantages of wide distribution range and large reserve in the natural world, good compactibility, strong water permeability, high shear strength, difficult liquefaction and the like, and is widely applied to engineering construction. With the rise of engineering such as high earth and rockfill dams, highways, and high-speed railways, research on gradation and mechanical properties of coarse particles has become an important subject in geotechnical engineering. Therefore, the gradation and mechanical properties and other characteristics of the coarse particles need to be studied.
Disclosure of Invention
In view of this, the invention provides a method, a device, a storage medium and equipment for generating a coarse particle block system, and relates to a method for generating a discontinuous deformation analysis block system of particles, which strictly meets grading requirements, and can obtain a more accurate coarse particle block system, thereby being more practical.
In order to achieve the first object, the technical scheme of the method for generating the coarse granule block system provided by the invention is as follows:
the method for generating the coarse granule block system comprises the following steps:
establishing a basic form database of coarse granule particles;
randomly generating coarse grain particles into the area of the coarse grain block system to be generated according to the grading condition of the coarse grain particles in the coarse grain block system to be generated, so that the total area of the coarse grain particles is strictly equal to the total area of the coarse grain block sample to be generated, and at the moment, the positions of the coarse grain particles in the area of the coarse grain block system to be generated are determined according to the position of the basic form database;
randomly and uniformly throwing the coarse aggregate particles in the area of the coarse aggregate block system to be generated into a set random throwing model, wherein the set random throwing model comprises a bottom restraint plate, a left side restraint plate and a right side restraint plate, and the left side restraint plate and the right side restraint plate are respectively arranged on two sides of the bottom restraint plate through bottom edges;
writing the relevant information of the discontinuous deformation analysis geometric file into the file to form a discontinuous deformation analysis program of compaction and free fall of the random release model;
under set parameters, the loading plate utilizes the discontinuous deformation analysis program to carry out compaction operation on coarse grain particles in the area of the coarse grain material block system to be generated, and extracts a compaction model obtained by the compaction operation; in addition, the method also comprises a step of verifying the size of the compaction model, if the size does not meet the requirement, the height of the prepared sample is adjusted again, and particle generation, random feeding and compaction operations are carried out until the compaction model which strictly meets the grading and size requirements is obtained;
deleting the loading plate, the bottom constraint plate, the left constraint plate and the right constraint plate to obtain a compacted coarse aggregate model;
applying a restriction around the compacted coarse particle pattern to obtain the coarse particle bulk system.
The method for generating the coarse particle block system provided by the invention can be further realized by adopting the following technical measures.
Preferably, in the step of randomly and uniformly feeding coarse material particles in the area of the coarse material block system to be generated to a set random feeding model, the lowest position of the random feeding model has a set distance to the bottom restraint plate.
Preferably, in the step of applying a restriction member around the compacted coarse grain pattern to obtain the coarse grain block system, latex films are applied to left and right sides of the compacted coarse grain pattern, a fixing plate is applied to a bottom of the compacted coarse grain pattern, and a loading plate is applied to a top of the compacted coarse grain pattern.
Preferably, the step of randomly generating coarse particles into the area of the coarse particle block system to be generated according to the grading condition of the coarse particles in the coarse particle block system to be generated, so that the total area of the coarse particles is strictly equal to the total area of the coarse particle block sample to be generated specifically comprises the following steps:
randomly extracting a coarse grain particle X from the basic morphology databaseiCalculating XiMinimum circumscribed circle diameter D and area A of the coarse particle particlesdCalculating such that XiLimited to grading
Figure BDA0003005312980000031
Random size scaling K within a rangeR：
KR＝KL+(KU-KL)×rand()
Figure BDA0003005312980000032
KU＝Pi s/D
Wherein the rand () -random number
Then, area A of the generated particleswCan be expressed as:
Aw＝KR 2×Ad；
adding the areas of the coarse particles under the grading until the particle size is in the grading
Figure BDA0003005312980000033
Total area of particles A in the rangeiCThe total area A of the particles calculated according to the grading is exceeded for the first timei；
Computing grading
Figure BDA0003005312980000034
Overall size scaling L of generated particles within a ranger：
Figure BDA0003005312980000035
Circulating all coarse particle granules under i-grade composition, and specifically comprising the following steps:
firstly, determining the centroid of the particles m;
determining the centroid of the coarse grain m
Figure BDA0003005312980000036
Direction vector pointing to particle vertex j
Figure BDA0003005312980000037
Scaling the size of the coarse particle and randomly rotating the coarse particle by an angle theta to obtain new coordinates of the vertex of the coarse particle
Figure BDA0003005312980000041
The calculation formula of (a) is as follows:
Figure BDA0003005312980000042
Figure BDA0003005312980000043
Figure BDA0003005312980000044
recording the vertex coordinates of all coarse particle granules in the first-stage formulation;
and circulating all coarse particle particles under the i-grade composition, and performing circulation on all coarse particle particles under the i + 1-grade composition until the generation of the coarse particle particles under the i-grade composition is completed, wherein the total area of the coarse particle particles is strictly equal to the total area of the coarse particle block sample to be generated.
Preferably, in the step of compacting coarse particles in the area of the coarse particle block system to be generated by the loading plate by using the discontinuous deformation analysis program under the set parameters, and extracting a compaction model obtained by the compacting operation,
the friction force, the adhesive force and the tensile strength among the coarse particles are all 0;
the action point of the external load applied to the loading plate is at the centroid of the loading plate;
the value range of the damping coefficient is 0.9-0.99.
Preferably, the process of randomly and uniformly feeding the coarse material particles in the area of the coarse material block system to be generated to the set random feeding model specifically includes the following steps:
aiming at coarse granular particles to be put, firstly, according to a simplex integral, calculating the centroid point coordinates of the coarse granular particles to be put;
randomly selecting a coordinate point in the set random putting model;
and moving the coordinates of the centroid points of the coarse granule particles to be thrown to the coordinate points to finish the throwing of the coarse granule particles to be thrown.
Preferably, in the step of randomly and uniformly feeding the coarse aggregate particles in the region of the coarse aggregate block system to be generated to the set random feeding model, the feeding sequence of the coarse aggregate particles to be fed is from large to small among the particle size groups.
Preferably, during the step of randomly and uniformly throwing the coarse aggregate particles in the area of the coarse aggregate block system to be generated into the set random throwing model, if there is an overlap between a rectangular frame to be thrown with the coarse aggregate particles and a rectangular frame to which the coarse aggregate particles have been thrown, the method further comprises the step of resetting a random throwing point for the coarse aggregate particles to be thrown, wherein the rectangular frame includes a minimum x coordinate, a maximum x coordinate, a minimum y coordinate and a maximum y coordinate of corresponding particles.
Preferably, during the step of randomly and uniformly feeding the coarse aggregate particles in the area of the coarse aggregate block system to be generated to the set random feeding model, if the feeding speed is obviously reduced and the feeding is not completed, the height of the random feeding model is increased.
Preferably, in the step of writing the relevant information of the discontinuous deformation analysis geometry file into a file to form the compaction and free-fall discontinuous deformation analysis program of the randomly delivered model, the relevant information of the discontinuous deformation analysis geometry file is written into the file through an fprintf function.
Preferably, in the step of writing the related information of the discontinuous deformation analysis geometry file into the file to form the discontinuous deformation analysis program of compaction and free fall of the randomly launched model, the vertex coordinates of each block are artificially added with 3 rows, 3 columns and 0 elements.
Preferably, in the step of compacting coarse particles in the area of the coarse particle block system to be generated by the loading plate by using the discontinuous deformation analysis program under the set parameters and extracting the compaction model obtained by the compacting operation, the set parameters include the number of loading steps, a loading curve, a maximum displacement ratio allowed by a single step, a time step and damping.
Preferably, in the step of compacting coarse particles in the area of the coarse aggregate block system to be generated by the loading plate using the discontinuous deformation analysis program under the set parameters, and extracting a compaction model obtained by the compacting operation, the compacting operation is realized by using a discontinuous deformation program improved based on the FORTRAN language.
Preferably, the coarse granule block system generation method further comprises the step of adjusting the height error of the coarse granule model.
Preferably, the step of adjusting the height error of the coarse grain model specifically includes the steps of:
at the estimated height HgOn the basis of (1), setting n groups of heights as Ha＝HgModulation samples of n × δ, where δ is the height interval;
forming 2n groups of coarse particle material models;
all the samples generated were analyzed, and the model with the height closest to H was selected and designated as Ht；
If the upper and lower limits of the height size of the 2n groups of granules do not include H, the height interval needs to be increased by using the height closest to H as a reference, and the operation is repeated;
and regulating the delta to be small, and repeating the operation to obtain a coarse particle sample strictly meeting the height size and grading requirements.
Preferably, the number of said repetitions depends on the rationality of the choice of δ in the test and on the experience of the operator.
Preferably, the step of adjusting the height error of the coarse grain material model further comprises assisting the dichotomy fine adjustment.
In order to achieve the second object, the invention provides a pellet block system generation device, comprising:
the invention provides a coarse granule block system generation device, which comprises:
the database establishing module is used for establishing a basic form database of the coarse granular particles;
the coarse particle random generation module is used for randomly generating coarse particles in the area of the coarse particle block system to be generated according to the grading condition of the coarse particles in the coarse particle block system to be generated, so that the total area of the coarse particles is strictly equal to the total area of the coarse particle block sample to be generated, and at the moment, the positions of the coarse particles in the area of the coarse particle block system to be generated are determined according to the position of the basic form database;
a random release model release module: the coarse particle material block system is used for randomly and uniformly throwing coarse particle material particles in the area of the coarse particle material block system to be generated into a set random throwing model, wherein the set random throwing model comprises a bottom restraint plate, a left side restraint plate and a right side restraint plate, and the left side restraint plate and the right side restraint plate are respectively arranged on two sides of the bottom restraint plate through bottom edges;
the discontinuous deformation analysis program generation module is used for writing the relevant information of the discontinuous deformation analysis geometric file into the file to form a discontinuous deformation analysis program of compaction and free fall of the random release model;
the compaction model generation module is used for carrying out compaction operation on coarse particle particles in the area of the coarse particle block system to be generated by using the discontinuous deformation analysis program through the loading plate under the set parameters and extracting a compaction model obtained through the compaction operation; in addition, the compaction model generation module is also used for verifying the size of the compaction model, if the size does not meet the requirement, the height of the prepared sample is adjusted again, and the operations of particle generation, random feeding and compaction are carried out until the compaction model which strictly meets the grading and size requirements is obtained;
the compacted coarse grain material model generation module is used for deleting the loading plate, the bottom constraint plate, the left constraint plate and the right constraint plate to obtain a compacted coarse grain material model;
a coarse particle bulk system generation module for applying a restriction around the compacted coarse particle model to obtain the coarse particle bulk system.
In order to achieve the third object, the invention provides a computer-readable storage medium having the following technical solutions:
the computer-readable storage medium provided by the present invention stores thereon a control program of the coarse aggregate block system generation method, which, when executed by a processor, implements the steps of the coarse aggregate block system generation method provided by the present invention.
In order to achieve the fourth object, the present invention provides an electronic device comprising:
the electronic device provided by the invention comprises a memory and a processor, wherein the memory stores a control program of the coarse aggregate block system generation method, and the control program of the coarse aggregate block system generation method realizes the steps of the coarse aggregate block system generation method provided by the invention when being executed by the processor.
The invention provides a block system generation method for discontinuous deformation analysis of coarse particles, which strictly meets the grading requirement, aiming at the defect that the block system generation function which strictly meets the grading requirement of block particles does not exist in a simulation coarse particle test of the discontinuous deformation analysis method. According to the method, polygonal particles meeting the grading requirement are randomly extracted in a certain area based on a basic form library according to the indoor test requirement of coarse particles, then the polygonal particles are randomly put in, the requirements of no boundary and no overlap are met among the particles, and then the coarse particle block system with close contact among the particles and stable integral structure is obtained through further compacting operation. And then, adjusting the height of the prepared sample through trial calculation to obtain a coarse aggregate model completely meeting the grading requirement.
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Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a flow chart illustrating the steps of a method for forming a coarse aggregate bulk system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a random feeding model formed in the course of the coarse aggregate block system generation method according to the embodiment of the present invention;
FIG. 3 is a schematic view of a compaction model resulting from a compaction operation formed during a coarse aggregate block system generation method provided by an embodiment of the present invention;
fig. 4 is a schematic diagram of a coarse particle bulk system generated by a coarse particle bulk system generation method provided by an embodiment of the present invention;
fig. 5 is a schematic diagram illustrating a signal flow direction relationship between functional modules in the coarse aggregate block system generating device according to the embodiment of the present invention;
fig. 6 is a schematic structural diagram of an operating device of a coarse particle block system generation method in a hardware operating environment according to an embodiment of the present invention.
Detailed Description
The invention provides a method, a device, a storage medium and equipment for generating a coarse particle material block system, which aim to solve the problems in the prior art, relates to a method for generating a granular material discontinuous deformation analysis block system which strictly meets grading requirements, and can obtain a more accurate coarse particle material block system, thereby being more practical.
Compared with in-situ and indoor tests of coarse particles, the numerical simulation test method has the general advantages of no need of considering the scale reduction effect, labor and material conservation, low dependence on time and space and the like. Most importantly, the method is not limited by experimental conditions and scales, and can repeatedly and freely regulate and control the critical state of characteristic deformation. Therefore, it is necessary to research the gradation of coarse particles, mechanical properties, etc. by numerical simulation means, and it can be combined with in-situ and indoor tests to realize advantage complementation.
At present, the numerical simulation method for researching the coarse granules is mainly based on a discrete element software Particle Flow Program (PFC) of a Particle Flow unit, but the method has a great defect that a basic unit of a model constructed by the method is a rigid and non-breakable disc, and the Particle shape of the coarse granules has a great influence on the mechanical properties of the coarse granules. In reality, the particle material is subjected to external force, deformation and self-stress state change, the internal microscopic physical process of the particle material is represented as the crushing, sliding and rolling of particles, and although the conventional PFC (power factor correction) adopts a Cluster technology to enable basic units to form a breakable particle Cluster, the particle Cluster cannot be deformed and crushed continuously after being crushed into a disc or a sphere of the basic unit. Meanwhile, the method has various problems such as rotary friction and the like. The Discontinuous Deformation Analysis (DDA) can use various irregular polygons to represent the shape of the particle, and the Analysis theory is relatively perfect, the related assumption is more rigorous, and the calculation efficiency is higher. While the rotation and sliding of the mass can be taken into account, the open-close iterative algorithm of which can accurately simulate the contact between the particles. It is clear that the DDA process has some theoretical advantages in studying coarse pellets. However, for the simulation of the coarse particles, the DDA does not have a function of automatically generating a polygonal particle structure satisfying the gradation requirement, which means that the problems of particle generation and feeding of the coarse particles in the DDA are in need of solution. At present, the generation and release research of irregular polygonal particles at home and abroad mainly focuses on the field of concrete aggregates, but the aggregates only play a role of a framework in concrete and do not need to be in contact with each other, and the particles of coarse aggregate are in contact with each other, so that the concrete aggregate generation and release algorithm cannot be directly used for modeling of the coarse aggregate. At present, there is a coarse particle material feeding algorithm suitable for a Finite Element Method (FEM)/Digital Elevation Model (DEM) Method, that is, particles are firstly reduced, then the contact relationship between the particles is judged according to the circumscribed enveloping circle of the particles, the reduced particles are fed to a specified area by adopting a monte carlo random algorithm, finally the particles are expanded to the original size, and FEM/DEM is adopted to calculate and stabilize to obtain a corresponding sample. However, this method is complicated and the resulting sample does not strictly meet the requirements for coarse particle size classification. Therefore, in order to be able to apply the advanced method of DDA to simulate the mechanical properties of coarse granules, it is necessary to invent a method for producing a bulk system of coarse granules DDA that strictly meets the grading requirements.
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description will be given of the method, apparatus, storage medium and electronic device for generating coarse aggregate block system according to the present invention with reference to the accompanying drawings and preferred embodiments, and the detailed description thereof will be made with reference to the following detailed description. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.
The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, with the specific understanding that: both a and B may be included, a may be present alone, or B may be present alone, and any of the three cases can be provided.
Method for producing coarse aggregate block system
The invention provides a method for generating a coarse grain DDA block system which strictly meets the grading requirement, aiming at the defect that the DDA method does not have a block system generating function which strictly meets the grading requirement of block particles in a coarse grain simulation test. According to the method, polygonal particles meeting the grading requirement are randomly extracted in a certain area based on a basic form library according to the indoor test requirement of coarse particles, then the polygonal particles are randomly put in, the requirements of no boundary and no overlap are met among the particles, and then the coarse particle block system with close contact among the particles and stable integral structure is obtained through further compacting operation. And then adjusting the height of the prepared sample through trial calculation to obtain a coarse aggregate model completely meeting the grading requirement. The specific technical scheme is as follows:
1. first, a base morphology library of coarse particles is built. The shape of the coarse granular material particles in the warehouse can be concave-convex blocks with any shape; can be in a predetermined shape, such as a triangle, a convex polygon or a concave polygon; or a collection of real sample morphologies obtained from CT slice scans. The form of the particles in the library is the basic form of coarse particles, and when a coarse particle numerical test model meeting the grading requirement is established, operations such as translation, scaling, rotation and the like are carried out on the basis to ensure the diversity and randomness of formed sample particles.
2. Defining the gradation condition of coarse grain sample to be generated, such as the size of each gradation grain diameter and the percentage of the grain content smaller than the gradation grain diameter, which are respectively marked as Pi sAnd Qi s. The gradation distribution shown in table 1 is used as a basis for the description of the subsequent description. It can be seen that the proportion of the particles with the particle size of less than 60mm is 100%, the proportion of the particles with the particle size of less than 40mm is 89.1%, and so on; and the smallest particle size is 5mm because the corresponding particle fraction is 0.
TABLE 1 coarse grain size distribution
Particle size (mm) 60 40 20 10 5
Percentage of particles smaller than the particle diameter (%) 100 89.1 69.5 45.1 0
3. According to the specification of the indoor soil test, the coarse particle material sample is rectangular in shape, and the length and the height of the coarse particle material sample are respectively marked as L and H. Here, L is 300mm and H is 600 mm. This indicates that coarse particles produced according to the grading will fill a rectangular area of 300mm x 600mm and will necessarily have some porosity due to the randomness of the contact between the particles; in other words, the total area of the collection of coarse particles will be less than 300mm x 600 mm.
4. A "preparation sample" having a length equal to the length of the coarse-grained material sample and a height H is seta(ii) a When making the first sample, let HaH; the subsequent steps in the re-production will give how to update Ha. According to the grading condition, a group of coarse granule particle sets meeting the grading requirement is generated, and the total area of the particle sets and the area A of the prepared sample are requiredzRemain consistent, wherein: a. thez＝L×Ha. The location of these particles is temporally consistent with the location in the database in which they are located. The principle of particle set generation is that the particle sizes are sequentially generated, and the particle set generation method aims to facilitate particle extraction during subsequent random feeding and improve feeding efficiency.
5. The particle size can be determined from the formula (1)
Figure BDA0003005312980000121
Total area of particles A in the rangeiComprises the following steps:
Figure BDA0003005312980000122
according to the example of the step (2), the total area of the granules having a particle diameter in the range of 60mm to 40mm was 19620mm2And the rest can be analogized in the same way.
6. Randomly extracting a particle from the particle basic morphology library established in the step (1), calculating the minimum circumcircle diameter and the area of the particle, and marking the minimum circumcircle diameter and the area as D and Ad. The particle size is limited to the following value calculated from the following formula
Figure BDA0003005312980000123
Random size scaling K of rangesR：
KR＝KL+(KU-KL)×rand()
Figure BDA0003005312980000124
KU＝Pi s/D
Wherein the rand () -random number
Then, the area A of the generated particleswCan be expressed as:
Aw＝KR 2×Ad。
7. adding the areas of the generated particles, and repeating the operation in the step (6) until the generated particle size is within the range
Figure BDA0003005312980000131
Total area of particles A in the rangeiCThe total area A of the particles calculated according to the grading is exceeded for the first timei. Then, in order to make AiCAnd AiStrictly equal, the overall size scaling L of the particles produced at this gradation can be calculated according to the following formular：
Figure BDA0003005312980000132
8. All the produced particles under i-grade composition are circulated, the centroid of the particle m is firstly determined, and then the centroid of the particle m is determined
Figure BDA0003005312980000133
Direction vector pointing to particle vertex j
Figure BDA0003005312980000134
On the basis, the size of the particles is scaled in the same proportion and randomly rotated by an angle theta, and the new coordinate of the particle vertex
Figure BDA0003005312980000135
The calculation formula of (c) is as follows:
Figure BDA0003005312980000136
Figure BDA0003005312980000137
Figure BDA0003005312980000138
the vertex coordinates of all particles at this stage of the formulation are then recorded.
9. And (5) moving to the next grade, returning to the step (6) to perform the generation operation of new particles again until the generation of the particles under all grades is finished. Up to now, coarse granule particle sets strictly meeting the grading requirements have been generated, but the positions of the coarse granule particles in the space depend on the positions in the basic library, and the random throwing operation needs to be carried out, so that the coarse granule particles are randomly and uniformly thrown into a designated random throwing area.
10. The randomly-thrown region is still a rectangular region, the length of the region is consistent with that of the sample, but the height is 3H, and the height can be increased or decreased according to the number of particles, the throwing efficiency and the like. Because the construction from the randomly thrown model to the final coarse aggregate model still needs to be subjected to motion simulation under the double load action of compaction and free falling body, the thickness or the length of the bottom restraint plate, the left and right side restraint plates and the top loading plate of the randomly thrown model needs to be further determined; meanwhile, the height from the bottom of the randomly-thrown model to the bottom restraint plate is determined, and the height is set to enable the randomly-thrown model to have sufficient space for adjustment, so that the phenomenon of 'jamming' in the top plate loading and compacting and free falling processes is prevented. The motion simulation of the randomly-put model under the action of the external load is carried out based on a discontinuous deformation analysis method (DDA), and the friction force, the bonding force and the tensile strength among particles are all set to be 0; the top plate load is applied to the centroid of the top plate; meanwhile, a damping coefficient of 0.99 needs to be set, so that the calculation efficiency is higher than that of a pure static force on one hand, and an energy dissipation mechanism can be started on the other hand, so that the compacted particles are prevented from bouncing after touching the bottom.
11. And establishing a random delivery model. The principle of random feeding is that the particles in the large particle size group are fed first and then the particles in the small particle size group are fed. For a certain particle to be thrown, firstly, the coordinates of the centroid point of the particle are calculated according to the simplex integral. By randomly selecting a coordinate point in the drop area and placing the centroid point of the particle at that point, its preliminary location can be determined.
12. And determining a rectangular box containing the preliminarily thrown particles, wherein the rectangular box consists of a minimum x coordinate, a maximum x coordinate, a minimum y coordinate and a maximum y coordinate of the particles. Judging the relation between the rectangular frame representing the particles and the random throwing area, and if the rectangular frame representing the particles and the random throwing area are overlapped, reselecting a random throwing point; meanwhile, whether the rectangular frame of the current particles is overlapped with the rectangular frame of the particles which are thrown in the past or not is judged, and if so, the random throwing point is required to be reset.
13. And (5) carrying out the random putting operation of the steps 11 and 12 on all the particles until all the particles are put. If the calculation speed of the random delivery is obviously reduced and the delivery cannot be successful, the delivery can be carried out again by appropriately increasing the height of the random delivery area. Fig. 1 shows a model of completed random shots.
14. According to the thickness or length information of the loading plate, the bottom constraint plate, the left and right constraint plates set in the step 10, the vertex and coordinate information of the loading plate, the bottom constraint plate and the left and right constraint plates can be easily calculated, and the 4 blocks are sequentially placed in the random blocks and then numbered. 3 fixing points are uniformly arranged on the bottom restraint plate and the left and right restraint plates respectively, and 1 loading point is arranged at the centroid of the loading plate. To this end, all relevant information required by the DDA geometry file, such as the vertex start and stop numbers characterizing the block, the coordinates of the vertices, and the block and joint material numbers (all 1) have been obtained in their entirety.
15. Relevant information of the DDA geometric file is written into the file through an fprintf function to form a DDA calculation file of a random release model for further compaction and free fall, and in order to meet the requirement of forward and backward expansion of a vertex array during DDA calculation, 0 element of 3 rows and 3 columns is artificially added behind the vertex coordinates of each block to achieve the purpose of meeting the requirement. Wherein fprintf is a formatting library function in C/C + +, is located in a header file < cstdio > or < bits/stdc + +. h >, and is used for formatting and outputting to a stream/file; the function prototype is int fprintf (FILE stream, const char, [ alignment ]), and the fprintf () function writes data (alignment) to the output stream (stream) according to a specified format (alignment).
16. After relevant information such as loading step number, loading curve, maximum displacement ratio allowed by single step, time step, damping and the like is set, the particle compacting operation is carried out by utilizing a DDA program improved based on the FORTRAN language. After compaction, the appropriate compaction model is extracted according to DDA post-processing procedures.
17. In combination with the setting in step 2, the height H of the coarse particle model due to the presence of the void ratiotNecessarily greater than H. Calculating the ratio H of the twor＝H/HtCan be determined at the height Hg＝H×HrA coarse particle system can be generated that approximately meets the grading requirements.
18. At the estimated height HgOn the basis of (1), setting n groups of heights as Ha＝HgModulation samples of n x δ, where δ is the height separation, e.g. taken to be 2 mm. And (5) repeating the operation of the step 2-16 to form 2n groups of new coarse particle material models. All the samples produced were analysed and the model with the height closest to H was chosen and recorded as Ht. Taking delta as 2mm as an example, the height error of the coarse particle model can be ensured to be controlled within 1 percent and even lower. The purpose of further improving the precision can be achieved by adjusting the size of delta.
19. If the upper and lower limits of the height dimension of the above-mentioned 2n groups of granules do not include H, it is necessary to adjust the height interval to be larger based on the height closest to H among them, and then repeat the operation of step 18 again, so that the combination of the heights of the granules that can frame H can always be found. And then, adjusting the height interval to be small, and repeating the operations of the steps 18 and 19 for 2-3 times, so that the coarse particle sample strictly meeting the height size and grading requirements can be finally realized. Note that the number of iterations of the model construction depends on the reasonableness of the trial height interval selection and the experience of the operator, which can also assist in dichotomy fine tuning, improving the efficiency of the trial. A coarse particle compaction model that strictly meets the grading requirements is shown in fig. 2.
20. The constraining and loading plates around the generated coarse particle sample were all deleted, and only the coarse particle information was retained. The latex film with triangular combination is applied on the left side and the right side, and the fixing plate and the loading plate with multi-block combination are applied on the bottom and the top, so that the bandwidth of the overall rigidity matrix is reduced, and the construction of a coarse grain DDA block system strictly meeting the grading is thoroughly realized, as shown in figure 3.
Coarse particle block forming device embodiment
The invention provides a coarse granule block system generation device, which comprises:
the database establishing module is used for establishing a basic form database of the coarse granular particles;
the coarse particle random generation module is used for randomly generating coarse particles in the area of the coarse particle block system to be generated according to the grading condition of the coarse particles in the coarse particle block system to be generated, so that the total area of the coarse particles is strictly equal to the total area of the coarse particle block sample to be generated, and at the moment, the positions of the coarse particles in the area of the coarse particle block system to be generated are determined according to the position of the basic form database;
a random release model release module: the system comprises a coarse particle block system, a random throwing model, a bottom constraining plate, a left constraining plate and a right constraining plate, wherein the coarse particle block system is used for randomly and uniformly throwing coarse particle particles in an area of the coarse particle block system to be generated into the set random throwing model, the set random throwing model comprises the bottom constraining plate, the left constraining plate and the right constraining plate, and the left constraining plate and the right constraining plate are respectively arranged on two sides of the bottom constraining plate through bottom edges;
the discontinuous deformation analysis program generation module is used for writing the relevant information of the discontinuous deformation analysis geometric file into the file to form a discontinuous deformation analysis program of compaction and free fall of the random release model;
the compaction model generation module is used for carrying out compaction operation on coarse particle particles in the area of the coarse particle block system to be generated by the loading plate by utilizing a discontinuous deformation analysis program under the set parameters and extracting a compaction model obtained by the compaction operation; in addition, the compaction model generation module is also used for verifying the size of the compaction model, if the size of the compaction model does not meet the requirement, the height of the prepared sample is adjusted again, and particle generation, random feeding and compaction operations are carried out until the compaction model which strictly meets the grading and size requirements is obtained;
the compacted coarse grain material model generation module is used for deleting the loading plate, the bottom constraint plate, the left constraint plate and the right constraint plate to obtain a compacted coarse grain material model;
and a coarse particle block system generation module for applying a restriction around the compacted coarse particle model to obtain the coarse particle block system.
Computer-readable storage medium embodiments
The computer-readable storage medium provided by the present invention is characterized in that the computer-readable storage medium stores a control program of the coarse aggregate bulk system generation method, and the control program of the coarse aggregate bulk system generation method realizes the steps of the coarse aggregate bulk system generation method provided in embodiment 1 of the present invention when executed by the processor.
Electronic device embodiment
Referring to fig. 6, fig. 6 is a schematic structural diagram of a coarse particle block system generating device in a hardware operating environment according to an embodiment of the present invention.
As shown in fig. 6, the coarse particle block system generating apparatus may include: a processor 1001, such as a Central Processing Unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a WIreless interface (e.g., a WIreless-FIdelity (WI-FI) interface). The Memory 1005 may be a Random Access Memory (RAM) Memory, or may be a Non-Volatile Memory (NVM), such as a disk Memory. The memory 1005 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the configuration shown in fig. 6 does not constitute a limitation of the coarse bulk system generation apparatus and may include more or fewer components than shown, or some components in combination, or a different arrangement of components.
As shown in fig. 6, the memory 1005, which is a storage medium, may include therein an operating system, a data storage module, a network communication module, a user interface module, and a coarse particle block system generating program.
In the coarse particle block system generating apparatus shown in fig. 6, the network interface 1004 is mainly used for data communication with a network server; the user interface 1003 is mainly used for data interaction with a user; the processor 1001 and the memory 1005 in the coarse particle block system generating apparatus according to the present invention may be provided in the coarse particle block system generating apparatus, and the coarse particle block system generating apparatus calls the coarse particle block system generating program stored in the memory 1005 through the processor 1001 and executes the coarse particle block system generating method provided by the embodiment of the present invention.
Details not described in this specification are within the skill of the art that are well known to those skilled in the art.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (20)

1. A method of forming a coarse aggregate block system, comprising the steps of:
establishing a basic form database of coarse granule particles;
randomly generating coarse grain particles into the area of the coarse grain block system to be generated according to the grading condition of the coarse grain particles in the coarse grain block system to be generated, so that the total area of the coarse grain particles is strictly equal to the total area of the coarse grain block sample to be generated, and at the moment, the positions of the coarse grain particles in the area of the coarse grain block system to be generated are determined according to the position of the basic form database;
randomly and uniformly throwing the coarse aggregate particles in the area of the coarse aggregate block system to be generated into a set random throwing model, wherein the set random throwing model comprises a bottom restraint plate, a left side restraint plate and a right side restraint plate, and the left side restraint plate and the right side restraint plate are respectively arranged on two sides of the bottom restraint plate through bottom edges;
writing the relevant information of the discontinuous deformation analysis geometric file into the file to form a discontinuous deformation analysis program of compaction and free fall of the random release model;
under the set parameters, the loading plate utilizes the discontinuous deformation analysis program to carry out compaction operation on coarse particle particles in the area of the coarse particle block system to be generated, and extracts a compaction model obtained by the compaction operation;
deleting the loading plate, the bottom constraint plate, the left constraint plate and the right constraint plate to obtain a compacted coarse aggregate model;
applying a restriction around the compacted coarse particle pattern to obtain the coarse particle bulk system.
2. The coarse aggregate block system generation method according to claim 1, characterized in that in the step of randomly and evenly throwing coarse aggregate particles in the area of the coarse aggregate block system to be generated to a set random throwing model, the lowest position of the random throwing model has a set distance to the bottom restraint plate.
3. The coarse particle block system generating method as claimed in claim 1, wherein during the step of applying a restriction around the compacted coarse particle model to obtain the coarse particle block system, latex films are applied to the left and right sides of the compacted coarse particle model, a fixed plate is applied to the bottom of the compacted coarse particle model, and a loading plate is applied to the top of the compacted coarse particle model.
4. The coarse particle mass system generating method according to claim 1, wherein the step of randomly generating coarse particle particles into the area of the coarse particle mass system to be generated according to the grading of the coarse particle particles in the coarse particle mass system to be generated, so that the total area of the coarse particle particles is strictly equal to the total area of the coarse particle mass sample to be generated, comprises the following steps:
randomly extracting a coarse grain particle X from the basic morphology databaseiCalculating XiMinimum circumscribed circle diameter D and area of particle AdCalculating such that XiLimited to grading
Figure FDA0003566953230000021
Random size scaling K within a rangeR：
KR＝KL+(KU-KL)×rand()
Figure FDA0003566953230000022
Figure FDA0003566953230000023
Wherein the rand () -random number
Then, the area A of the generated particleswCan be expressed as:
Aw＝KR 2×Ad；
adding the areas of the coarse particles under the grading until the particle size is in the grading
Figure FDA0003566953230000024
Total area of particles A in the rangeiCThe total area A of the particles calculated according to the grading is exceeded for the first timei；
Computing grading
Figure FDA0003566953230000025
Overall size scaling L of generated particles within a ranger：
Figure FDA0003566953230000026
Circulating all coarse particle granules under i-grade composition, and specifically comprising the following steps:
firstly, determining the centroid of the particles m;
determining the centroid of the coarse grain m
Figure FDA0003566953230000031
Direction vector pointing to particle vertex j
Figure FDA0003566953230000032
Scaling the size of the coarse particle and randomly rotating the coarse particle by an angle theta to obtain new coordinates of the vertex of the coarse particle
Figure FDA0003566953230000033
The calculation formula of (a) is as follows:
Figure FDA0003566953230000034
Figure FDA0003566953230000035
Figure FDA0003566953230000036
recording the vertex coordinates of all coarse particle granules in the first-stage formulation;
and circulating all coarse particle particles under the i-grade composition, and performing circulation on all coarse particle particles under the i + 1-grade composition until the generation of the coarse particle particles under the i-grade composition is completed, wherein the total area of the coarse particle particles is strictly equal to the total area of the coarse particle block sample to be generated.
5. The coarse material block system generation method according to claim 1, wherein, under the set parameters, during the step of compacting coarse material particles in the area of the coarse material block system to be generated by the loading plate by using the discontinuous deformation analysis program, and extracting the compaction model obtained by the compacting operation,
the friction force, the adhesive force and the tensile strength among the coarse particles are all 0;
the action point of the external load applied to the loading plate is at the centroid of the loading plate;
the value range of the damping coefficient is 0.9-0.99.
6. The coarse aggregate block system generation method according to claim 1, wherein the process of randomly and uniformly feeding the coarse aggregate particles in the area of the coarse aggregate block system to be generated to a set random feeding model comprises the following steps:
aiming at coarse granular particles to be put, firstly, according to a simplex integral, calculating the centroid point coordinates of the coarse granular particles to be put;
randomly selecting a coordinate point in the set random putting model;
and moving the coordinates of the centroid points of the coarse granule particles to be thrown to the coordinate points to finish the throwing of the coarse granule particles to be thrown.
7. The coarse aggregate block system generating method according to claim 1, wherein during the step of randomly and uniformly feeding the coarse aggregate particles in the area of the coarse aggregate block system to be generated to the set random feeding model, the feeding sequence of the coarse aggregate particles to be fed is from large to small between grain size groups.
8. The coarse aggregate block system generating method according to claim 1, wherein during the step of randomly and uniformly throwing the coarse aggregate particles in the area of the coarse aggregate block system to be generated into the set random throwing model, if there is an overlap between the rectangular frame for throwing the coarse aggregate particles and the rectangular frame for throwing the coarse aggregate particles, the method further comprises the step of resetting a random throwing point for the coarse aggregate particles to be thrown, wherein the rectangular frames comprise a minimum x coordinate, a maximum x coordinate, a minimum y coordinate and a maximum y coordinate of the corresponding particles.
9. The coarse aggregate block system generation method of claim 1, wherein during the step of randomly and uniformly feeding the coarse aggregate particles in the area of the coarse aggregate block system to be generated to the set random feeding model, if the feeding speed is significantly reduced and the feeding is not completed, the height of the random feeding model is increased.
10. The method for generating a coarse aggregate block system according to claim 1, wherein during the step of writing the information related to the discontinuous deformation analysis geometry file into a file, and forming the discontinuous deformation analysis program of compaction and free fall of the randomly launched model, the information related to the discontinuous deformation analysis geometry file is written into the file through fprintf function.
11. The method for generating a coarse aggregate block system according to claim 10, wherein during the step of writing the information related to the discontinuous deformation analysis geometry file into the file to form the discontinuous deformation analysis program of compaction and free fall of the randomly launched model, the vertex coordinates of each block are artificially added with 3 rows and 3 columns of 0 elements.
12. The coarse aggregate block system generation method of claim 1, wherein the step of compacting coarse aggregate particles in the area of the coarse aggregate block system to be generated by the loading plate by the discontinuous deformation analysis program under set parameters, wherein the set parameters comprise loading step number, loading curve, maximum displacement ratio allowed by a single step, time step and damping, and extracting a compaction model obtained by the compacting operation.
13. The coarse aggregate block system generating method according to claim 1, wherein, in the step of compacting coarse aggregate particles in the area of the coarse aggregate block system to be generated by the loading plate by using the discontinuous deformation analysis program under the set parameters, and extracting a compaction model obtained by the compacting operation, the compacting operation is realized by using a discontinuous deformation program based on the improvement of FORTRAN language.
14. The coarse particle block system generating method of claim 1, further comprising the step of adjusting a height error of the coarse particle model.
15. The method for creating a coarse aggregate block system according to claim 14, wherein said step of adjusting the height error of said coarse aggregate model comprises the steps of:
at the estimated height HgOn the basis of (1), setting n groups of heights as Ha＝HgModulation samples of n × δ, where δ is the height spacing;
forming 2n groups of coarse particle material models;
all the samples generated were analyzed, and the model with the height closest to H was selected and designated as Ht；
If the upper and lower limits of the height size of the 2n groups of granules do not include H, the height interval needs to be increased by using the height closest to H as a reference, and the operation is repeated;
and regulating delta to be small, and repeating the operation to obtain a coarse particle material sample strictly meeting the height size and grading requirements.
16. A method of forming a coarse grained bulk system according to claim 15 wherein the number of iterations depends on the rationality of the δ -choice in the trial and the experience of the operator.
17. The coarse particle block system creation method of claim 16, wherein the step of adjusting the height error of the coarse particle model further comprises assisting a dichotomy fine adjustment.
18. A coarse material block system generating device, comprising:
the database establishing module is used for establishing a basic form database of the coarse granular particles;
the coarse particle random generation module is used for randomly generating coarse particles in the area of the coarse particle block system to be generated according to the grading condition of the coarse particles in the coarse particle block system to be generated, so that the total area of the coarse particles is strictly equal to the total area of the coarse particle block sample to be generated, and at the moment, the positions of the coarse particles in the area of the coarse particle block system to be generated are determined according to the position of the basic form database;
a random release model release module: the coarse particle material block system is used for randomly and uniformly throwing coarse particle material particles in the area of the coarse particle material block system to be generated into a set random throwing model, wherein the set random throwing model comprises a bottom restraint plate, a left side restraint plate and a right side restraint plate, and the left side restraint plate and the right side restraint plate are respectively arranged on two sides of the bottom restraint plate through bottom edges;
the discontinuous deformation analysis program generation module is used for writing the relevant information of the discontinuous deformation analysis geometric file into the file to form a discontinuous deformation analysis program of compaction and free fall of the random release model;
the compaction model generation module is used for carrying out compaction operation on coarse particle particles in the area of the coarse particle block system to be generated by using the discontinuous deformation analysis program through the loading plate under the set parameters and extracting a compaction model obtained through the compaction operation;
the compacted coarse grain material model generation module is used for deleting the loading plate, the bottom constraint plate, the left constraint plate and the right constraint plate to obtain a compacted coarse grain material model;
a coarse particle bulk system generation module for applying a restriction around the compacted coarse particle model to obtain the coarse particle bulk system.
19. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a control program of a coarse aggregate block system generation method, which when executed by a processor, carries out the steps of the coarse aggregate block system generation method of any one of claims 1 to 17.
20. An electronic device, comprising a memory and a processor, the memory having stored thereon a control program of a coarse aggregate block system generation method, which when executed by the processor, implements the steps of the coarse aggregate block system generation method of any of claims 1-17.
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