CN104318030B - Computational methods are automated based on equivalent Method of Arch Dam Foundation overall deformation modulus is deformed - Google Patents
Computational methods are automated based on equivalent Method of Arch Dam Foundation overall deformation modulus is deformed Download PDFInfo
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Abstract
The present invention relates to arch dam design parameter acquiring technology, modeling pattern, which is manually participated in, it discloses a kind of Method of Arch Dam Foundation overall deformation modulus automation computational methods equivalent based on deformation, in solution conventional art brings the problem of difficulty is checked in fault rate height, inefficiency, inspection.Including：A. model scope is determined according to arch abutment position, position influence is become to arch abutment by contrasting different models scope, tends towards stability and is scanned for convergent mode by deformation, determine overall deformation modulus FEM calculation standardized model；B. based on overall deformation modulus FEM calculation standardized model, position influence is become to arch abutment by contrasting different arch abutment segments, tend towards stability and scanned for convergent mode by deformation, it is determined that meeting desired minimum arch abutment segments, carry out model unit mesh generation；C. composite cell parameters in model are obtained using Area-weighted calculation；D. automation calculates overall deformation modulus.Suitable for arch dam design.
Description
Technical field
The present invention relates to arch dam design parameter acquiring technology, and in particular to a kind of Method of Arch Dam Foundation equivalent based on deformation is integrated
Deformation modulus automates computational methods, belongs to hydraulic engineering arch dam design field.
Background technology
Latest edition《Arched concrete dam design specification》(DL/T 5346-2006) requirement is to the requirement of dam foundation overall deformation modulus
Calculated using deformation equivalence principle, but specification is not described in detail to deforming equivalent relative theory method.Therefore, at present
When carrying out Arch Dam Structure stress analysis using arch-cantilever method, in addition to the method for equal effect is deformed, dam foundation overall deformation modulus parameter is obtained
Still main use empirical method, comprehensive estimate method is taken to carry out.
Empirical method value is main according to dam foundation lithology information, grand with reference to related Regulations, industry sources, engineering data
Comprehensive change mould design parameter is determined in sight, is mainly used in the project concept phase, relevant parameter value does not take into full account rock
There is larger gap in body test situation, base rock distribution situation, and actual conditions.
Comprehensive estimate rule is main to be integrated and estimates according to dam foundation rock mass test data at different levels, foundation plane rock mass distribution situations at different levels
Calculate, be mainly used in project feasibility study and design of bid stage, when foundation plane has complicated rock mass distribution situation, due to that can not examine
Consider the influence that different change mould rock mass spatial distributions are deformed to the dam foundation, also can not suitably consider the measures such as base displacing, grouting
There is certain gap in influence, and actual conditions.
It is the deformation energy principle of equal effects, i.e. E to deform equivalent method general principle1×U1=E2×U2(E1It is comprehensive for the dam foundation to be asked
Close and become mould, U1For actual ground deformation values, E2Become deformation mould, U for the average dam foundation2For for average dam foundation deformation values), it is substantially former
Reason is consistent with the Vogt hypothesis of arch-cantilever method Into Semi-infinite Homogeneous ground.By deforming equivalent obtained dam foundation overall deformation modulus
The rock mass distribution of dam foundation space, dam foundation landform and based process measure can preferably be reflected, comparatively the comprehensive modulus value that becomes relatively is defined
Really, closer to actual conditions.
It is main to be calculated using FInite Element at present during deformation Equivalent Calculation, mainly include：Determine dam foundation computation model
Scope, unit grid are divided, loading and FEM calculation, carry out the flow such as Equivalent Calculation to displacement result.What is existed mainly asks
Topic includes：
(1) different engineering projects, the dam foundation landform of diverse location, geological condition are different, empirically determined to calculate
Model scope is with randomness, and comparativity is not strong.
(2) dam foundation landform, geological condition are ever-changing, during FEM calculation, if in strict accordance with Dam Foundation Rock distribution boundary
Different FEM models are set up, workload is undoubtedly huge, artificial participation modeling fault rate height, inefficiency.
(3) existing computational methods are without ripe design tool for using, and the working method of each calculation process is generally artificial behaviour
Make, computational efficiency is low, checks and checks difficulty.
The content of the invention
The technical problems to be solved by the invention are：It is a kind of automatic based on equivalent Method of Arch Dam Foundation overall deformation modulus is deformed
Change computational methods, solve dam foundation overall deformation modulus parameter acquiring computational methods in conventional art and participate in modeling pattern using artificial
Bring the problem of difficulty is checked in fault rate height, inefficiency, inspection.
The present invention solves the technical scheme that is used of above-mentioned technical problem：
Computational methods are automated based on equivalent Method of Arch Dam Foundation overall deformation modulus is deformed, are comprised the following steps：
A. model scope is determined according to arch abutment position, position influence is become to arch abutment by contrasting different models scope, by deformation
Tend towards stability and scanned for convergent mode, determine overall deformation modulus FEM calculation standardized model；
B. based on overall deformation modulus FEM calculation standardized model, by contrasting different arch abutment segments to arch
End becomes position influence, tends towards stability and is scanned for convergent mode by deformation, it is determined that meeting desired minimum arch abutment segments, enters
Row model unit mesh generation；
C. composite cell parameters in model are obtained using Area-weighted calculation；
D. automation calculates overall deformation modulus.
As prioritization scheme, in step A, Controlling model scope, standardized model are come by the proportionate relationship with arch abutment length T
Scope basic demand is：Arch abutment upstream extends 3T, downstream extends 5T, and 4T is extended to bottom, and 2T is extended to top.
As prioritization scheme, in step B, model unit mesh generation is carried out according to rectangle.
As prioritization scheme, in step B, arch abutment segments is 6 in the FEM calculation standardized model.
As prioritization scheme, in step D, when carrying out automation and calculating overall deformation modulus, using ANSYS finite element journeys
Sequence APDL command stream implicit invocation modes backstage carries out FEM calculation automatically.
The beneficial effects of the invention are as follows：
1st, because present invention employs standardized model, standardization grid and composite unit, and existing manual calculation
Flow is compared, and reduces modeling random so that finite element modeling complexity is greatly lowered, while finite element unit quantity is reduced
Also FEM calculation processing speed can be directly improved, difference calculates comparativity enhancing；
2nd, because the present invention is based on standardized model, standardization grid and composite unit, and existing meter by hand
Calculate flow to compare, automation can be achieved and calculates, reduce the probability of failure that manual calculation is present, data can be achieved after automation complete
Face is stored, and inspection is checked conveniently, and computational efficiency is greatly improved simultaneously in general, when being calculated in face of high-volume, can effectively be contracted
Short calculating cycle.
Brief description of the drawings
Fig. 1 is overall deformation modulus FEM calculation standardized model schematic diagram；
Fig. 2 is that overall deformation modulus FEM calculation standardizes grid schematic diagram.
Embodiment
According to《Arched concrete dam design specification》DL/T 5346-2006 requirements, to the substantially square of Arch Dam Structure stress analysis
Method is arch-cantilever method, as supporting, and dam foundation overall deformation modulus calculation procedure provides dam foundation comprehensive deformation for arch-cantilever method
Modulus calculating parameter.Main terms are explained as follows：
(1) arch-cantilever method (trial-load method)：For level arch and cantilever beam two it is by whole arch dam is discrete
System, conjugates compatibility conditions to determine that the load of arch system and girder system is distributed, carrying out arch dam with this should according to arch system and girder system point of intersection
The method that power is calculated.
(2) overall deformation modulus (comprehensive deformation modulus)：In basic a certain specific region
It is interior, it is considered to the influence that various rock mass structures (containing weak structural face and band) and based process measure are deformed to the dam foundation, by the spy
Determine the heterogeneous basis in region, the deformation modulus behind homogeneous basis is converted into according to the equivalent principle of deformation.
The Method of Arch Dam Foundation overall deformation modulus automation computational methods equivalent based on deformation in the present invention include following reality
Existing mode：
1st, it is comprehensive to become the standardization of mould limited element calculation model：
According to semi-infinite foundation theoretical assumption, when FEM model scope takes sufficiently large, it can be approximately considered and and actual
Reaction of the ground to Arch Dam Structure is consistent.FEM calculation region drafts, mainly in combination with Method of Arch Dam Foundation position, upstream and downstream
The factors such as the direction of shape, geological conditions and arch dam thrust at springer and thrust angle consider.From standardization angle, press and arch abutment
Length T proportionate relationship controls dam foundation model scope, becomes position influence to arch abutment by contrasting different models scope, becomes by deformation
Scanned in stable and convergent mode, it is determined that suitable model magnitude range.Analysis shows, standardized model scope is basic
It is required that should be：Arch abutment upstream extends 3T, downstream extends 5T, and 4T is extended to bottom, and 2T, model such as Fig. 1 institutes are extended to top
Show.
The present invention recommends to control dam foundation model scope by the proportionate relationship with arch abutment length T, and model basic configuration is
Concave, according to semi-infinite foundation theoretical assumption, can also use the standardized model of the pattern such as semicircle, trapezoidal, model
Size Control foundation can also be arch abutment infrastructure thickness etc..
2nd, it is comprehensive to become the standardization of mould finite element grid：
Root it was found that with reduce number of grid, reduction modeling difficulty, improve modeling efficiency, intend based on master pattern,
Carry out model unit mesh generation, the 1/n that unit size is arch abutment length T by rectangle entirely (n is arch abutment segments).N numerical value is got over
Greatly, model more approaches actual ground, to reduce element number, becomes position influence to arch abutment by contrasting different arch abutment segments, presses
Deformation tends towards stability to be scanned for convergent mode, it is determined that meeting desired minimum arch abutment segments.Analysis shows, standardization
Finite element grid arch abutment segments should be 6.Standardize grid signal as shown in Figure 2.
It is of the invention to recommend to carry out model unit mesh generation by rectangle entirely to master pattern, can also be as needed, to base
Plinth region-of-interest carries out unit encryption or sparse processing, and arch abutment number of fragments can also be increased, and be not limited to recommendation of the present invention
Quantity 6.
3rd, composite cell parameters Area-weighted is calculated：
Grid model is standardized to require to use differential analog geology, the terrain differences of recombiner unit material parameter.Composite wood
Material unit parameter is difficult to study calculating with standard theory mode to try to achieve, but as a kind of more usual way, can use area
Weighting scheme is tried to achieve.The specific processing mode of Area-weighted is：As unit across become mould be respectively E1, E2 ... .En a variety of rock mass when,
It is respectively A1, A2 ... ..An that various rock mass, which can be tried to achieve, in the unit inner area, then the Area-weighted unit of the unit becomes mould Ea=
(E1×A1+E2×A2+……En×An)/(A1+A2+……An)。
The composite cell parameters Area-weighted that the present invention recommends is calculated as simple computation pattern, for many anisotropy materials
Material can also be weighted processing respectively, and weighting result can also carry out ratio adjustment as needed.The present invention is multiple except obtaining
In condensation material outside all kinds of rock mass areas, moreover it is possible to obtain positional information, according to many material distributing positions using more careful side
Method carries out parameter processing
4th, it is comprehensive to become mould automation calculating realization
When being calculated according to standardized model and standardization grid, to realize automatic business processing, two have been substantially carried out
Branch is developed.One is that the standardization modeling under CAD platforms and composite cell parameters extracting tool are developed, under CAD
Standard is modeled and standard mesh generation is carried out by commonsense method, and identify word according to rock mass materials is obtained automatically using filling mode
Rock mass data, close object filter function using the choosing of CAD frames, window selected works and automatically confirm that composite unit, using CAD faces domain boolean
Computing common factor function realizes that all kinds of rock mass areas are automatically extracted in composite unit.Secondly whole to carry out data under VB platforms
Conjunction, limited metacall, Equivalent Calculation too development, FEM calculation are implicitly adjusted using ANSYS finite element program APDL command streams
Carried out automatically with mode backstage, calculate the preparation of required input data, Equivalent Calculation, Data Integration and then carried out by general requirement.
The present invention recommends to be modeled using CAD platforms to be asked for all kinds of rock mass areas of composite, and core is boolean's fortune
The common factor that rock mass and unit are asked in operation is calculated, existing Three-dimensional Design Software, graphic software development can also realize identity function.This hair
It is bright that to improve efficiency, selection ANSYS finite element program APDL command stream implicit invocation modes backstage carries out FEM calculation automatically,
Other business softwares or self-developed software can also realize identity function.
Claims (5)
1. automate computational methods based on equivalent Method of Arch Dam Foundation overall deformation modulus is deformed, it is characterised in that including following step
Suddenly：
A. model scope is determined according to arch abutment position, position influence is become to arch abutment by contrasting different models scope, tended to by deformation
Stable and convergent mode is scanned for, and determines overall deformation modulus FEM calculation standardized model；
B. based on overall deformation modulus FEM calculation standardized model, arch abutment is become by contrasting different arch abutment segments
Position influence, tends towards stability by deformation and is scanned for convergent mode, it is determined that meeting desired minimum arch abutment segments, carries out mould
Type unit grid is divided；
C. composite cell parameters in model are obtained using Area-weighted calculation；
D. automation calculates overall deformation modulus.
2. as claimed in claim 1 based on equivalent Method of Arch Dam Foundation overall deformation modulus automation computational methods are deformed, it is special
Levy and be, in step A, Controlling model scope, standardized model scope basic demand are come by the proportionate relationship with arch abutment length T
For：Arch abutment upstream extends 3T, downstream extends 5T, and 4T is extended to bottom, and 2T is extended to top.
3. as claimed in claim 1 based on equivalent Method of Arch Dam Foundation overall deformation modulus automation computational methods are deformed, it is special
Levy and be, in step B, model unit mesh generation is carried out according to rectangle.
4. as claimed in claim 1 based on equivalent Method of Arch Dam Foundation overall deformation modulus automation computational methods are deformed, it is special
Levy and be, in step B, arch abutment segments is 6 in the FEM calculation standardized model.
5. as claimed in claim 1 based on equivalent Method of Arch Dam Foundation overall deformation modulus automation computational methods are deformed, it is special
Levy and be, it is hidden using ANSYS finite element program APDL command streams when carrying out automation calculating overall deformation modulus in step D
Formula method of calling backstage carries out FEM calculation automatically.
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| CN107895086B (en) * | 2017-11-27 | 2021-04-06 | 中国电建集团成都勘测设计研究院有限公司 | Equivalent stress analysis method for full dam body of arch dam |
| CN110374047B (en) * | 2019-05-28 | 2020-05-05 | 中国水利水电科学研究院 | Deformation-based arch dam operation period real-time safety monitoring threshold determination method |
| CN112395798A (en) * | 2020-11-30 | 2021-02-23 | 中国电建集团成都勘测设计研究院有限公司 | Safety evaluation method for arch dam structure affected by mechanism unknown foundation deformation |
| CN116167258B (en) * | 2022-11-01 | 2024-04-23 | 中国长江三峡集团有限公司 | Finite element face unit grid creation method for multi-round hole planar metal mesh |
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