CN105912753B - Seabed side slope three-dimensional method for analyzing stability based on Strength Reduction Method - Google Patents
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Abstract
The present invention relates to a kind of seabed side slope three-dimensional method for analyzing stability based on Strength Reduction Method.This method includes that S1. selectes region to be analyzed；S2. it treats analyzed area and carries out pre-treatment；S3. by derived excel file, ABAQUS is generated by ABAQUS numerical value interface routine and imports file .inp；S4. self-weight stress field is constructed；S5. stability analysis is carried out；S6. logarithm calculated result is analyzed.The present invention by ABAQUS numerical value interface routine, enable not only model import in ABAQUS, and can correctly carry out operation and obtain corresponding result of study.
Description
Technical field
The present invention relates to a kind of Method for Slope Stability Analysis, especially a kind of seabed side slope three based on Strength Reduction Method
Stability maintenance method for qualitative analysis.
Background technique
With China coastal seas sea area engineering development, seabed potential geological disaster especially seabed slope instability has become prestige
An important factor for coercing offshore engineering.Submarine landslide, which refers to, not to be consolidated to obtain soft-sediment on submarine slope or has weak structural face
Rock, there is a phenomenon where slide for the weak structural face in slope under external force.Seabed Method for Slope Stability Analysis
Research be still within developing stage at present.With the generation and development of finite element, using point of stringent ess-strain method
Possibility is stablized and be deformed into analysis structure, is gradually applied in geotechnical engineering slope stability analysis.
Most of ABAQUS finite element stability of slope Journal of Sex Research is all based on traditional two dimension and three-dimensional finite element at present
It is that model obtains as a result, be no longer satisfied the needs of research and engineering precision, need one kind that can embody submarine geomorphy
Finite element modeling calculate work to complete the numerical value of seabed stability of slope early period.
GOCAD (Geological Object Computer Aided Design) Geologic modeling software is French Nancy
The Visualization Modeling software for being mainly used in geology field of university's exploitation.GOCAD software have powerful three-dimensional modeling,
It visualizes, the function of GEOLOGICAL INTERPRETATION and analysis.Both surface modeling can be carried out, solid modelling can be carried out；Both it can design
Geometric objects, can also be with expressive space property distribution.
ABAQUS is the finite element software of a set of powerful engineering simulation, and the range solved the problems, such as is from relatively easy
Linear analysis to many complexity nonlinear problem.ABAQUS includes abundant, analog random geometry a list
First library.ABAQUS is in addition to can solve a large amount of structures (stress/displacement)) topic, many problems in Other Engineering field can also be simulated,
Such as heat transfer, mass diffusion, crack preventing, acoustic analysis, rock-soil mechanics analysis (fluid permeability/stress coupling analysis)
And piezoelectric dielectric analysis.
Summary of the invention
Technical problem to be solved by the invention is to provide one kind can satisfy engineering precision need, be able to achieve GOCAD and
The seabed side slope three-dimensional method for analyzing stability based on Strength Reduction Method of interface between ABAQUS.
It is as follows that the present invention solves technical solution used by above-mentioned technical problem:
Seabed side slope three-dimensional method for analyzing stability based on Strength Reduction Method, includes the following steps:
S1. region to be analyzed is selected；
S2. it treats analyzed area and carries out pre-treatment:
S21. the data for being analysed to region, which import, forms three-dimensional landform figure in GOCAD；
S22. the three-dimensional landform figure of formation is imported in Surfer, and forms seabed exterior view after interpolation processing；
S23. seabed exterior view is imported in GOCAD, by sequentially forming grid by point-line-face-body, composition is not advised
Three-dimensional bottom relief map under the conditions of upper surface then；
S24. the three-dimensional bottom relief map in GOCAD is exported as into excel file；
S3. by derived excel file, ABAQUS is generated by ABAQUS numerical value interface routine and imports file .inp, number
Value interface routine comprises the following processes:
S31. excel file is imported into numerical value interface routine；
S32. to the three-dimensional coordinate parameter of each node of generation unit grid in excel file, the i.e. three-dimensional of p0 to p7
Coordinate parameters are modified in the way of following table:
S33. ABAQUS is exported as from numerical value interface routine imports file .inp；
S4. self-weight stress field is constructed:
S41. it writes and imports file .inp, the direction x that boundary condition is limitation front and back two sides is displaced, the y on left and right two sides
Direction is unique, and bottom surface limits the displacement on its two sides xy；
S42. after the completion of writing, it will import in file .inp importing ABAQUS and generate model；
S43. the corresponding module in ABAQUS is executed, by six components of stress of the unit center point in self-weight stress field
F11, F22, F33, F12, F13, F23 are output to external file .txt and export；
S44. the file in external file .txt other than data line is deleted, and increases model before the data of each unit
Name, format are " -1. serial number of model name ", and each be about to six components of stress belonging to the same unit and separated with comma；
S5. stability analysis is carried out:
S51. the gravitational field file after conversion is led back among former ABAQUS model, surface (table is generated at the top of model
Face)；
S52. defined analysis step-length, and reduction operation is carried out to cohesive strength and internal friction angle, and be input to input ABAQUS
Among program, formula is as follows:
Wherein, C,Respectively cohesive strength and internal friction angle, Cm、Cohesive strength and internal friction angle after being respectively reduced, Fm
For strength reduction factor, numberical range 0.5-10；
S53. in ABAQUS, analysis seaway load is at t=0, t=0.25T, t=0.5T and t=0.75T moment, respectively
Apply the wave pressure of vertical direction different moments on sea bed surface, according to small amplitude wave theory, the dynamic pressure of water body can be by formula
(3) it indicates:
As z=-h, seabed surface pressure are as follows:
Wherein, z is corrugated relative altitude, and H is wave height, and σ is fluctuation circular frequency, and ρ is fluid density, and k is wave number, and h is quiet
The water surface to seabed vertical range；
S54. model is integrally calculated using ABAQUS, output variable is safety coefficient FsWith sea bottom surface selected point
Displacement；
S6. logarithm calculated result is analyzed:
S61. reduction integral unit displacement isogram analysis: according in t=0, t=0.25T, t=0.5T and t=
When tetra- moment of 0.75T calculate termination, the reduction integral unit displacement isogram being respectively formed in ABAQUS, if occurring from more
A sliding is developed towards single circle sliding surface, then slides the trend separated towards multiple sliding surfaces by single, then carries out S62；
S62. seabed slope stability is judged by safety coefficient:
S621. by safety coefficient FSDisplacement with sea bottom surface selected point is provided as output variable using ABAQUS
Combine function obtains the safety coefficient F of different momentsSWith the variation relation figure of displacement；
S622. pass through safety coefficient FSThe corresponding relationship at value of safety factor value and moment is obtained with the variation relation figure of displacement,
If the wave trend of dipping and heaving is presented with variation constantly for value of safety factor value, the minimum value of value of safety factor value is taken, and utilizes " building
Slope project technical specification " (GB 50330-2013) judge whether side slope is stable.
Preferably, the data in region to be analyzed are with cad Software Create and with the preservation of .dxf format wait divide in S21
Analyse the bottom contour bathymetric data in region.
Preferably, analysis step-length is at least a cycle T, and cycle T is wave cycle in S53, it is bent to complete once sinusoidal
The time of line.
Preferably, in S53, the calculation method of wave number k are as follows:
S531. in MATLAB environment, if wave number is unknown number x, calculation formula are as follows:
F=inline (' x- (/ (g*tanh (x*h))) ')
S532. the range for taking f is -100 to 100；
S533. zero point of the f between -20 20 is searched；
S534. after successive ignition, the value of wave number k is obtained.
Matlab function in the present invention: fzero, for searching the zero point of unitary continuous function；Ezplot, picture letter
Number, it is not necessarily to data preparation, directly draws functional digraph；Inline is used to define the Inline Function of a class.
DXF in the present invention is autodesk, inc.'s exploitation for carrying out CAD data between AutoCAD and other softwares
The CAD data file format of exchange.DXF is a kind of vector data form of opening.
The present invention compared with the existing technology has the following advantages that and effect:
1, since the present invention is by ABAQUS numerical value interface routine, enable not only model import in ABAQUS, but also
And it can correctly carry out operation and obtain corresponding result of study.
2, it is connect due to the present invention by the application between Visual C# language platform development GOCAD and ABAQUS software
Mouth program, realizing only need to be using CAD bathymetric chart, complicated seabed can be generated in finite element analysis software ABAQUS
Shape and landform model.
3, it since the present invention is by ABAQUS output file conversion programs of Visual C# language platform development, solves
Gravity field data format is converted under the conditions of big data quantity, and the field data file after this document is converted complies fully with leads back to
Next step static(al) is carried out in ABAQUS software and dynamic load applies the requirement calculated.
4, since the present invention forms unique seabed side slope three-dimensional method for analyzing stability and technology path, utilization are limited
Meta analysis means have combined influence of the Wave power load as external loads to seabed side slope stress state, improve
The precision of calculating simplifies the process of seabed stability analysis.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is technology path schematic diagram of the invention.
Fig. 2 is model conversion control technology route schematic diagram of the invention.
Fig. 3 is value of safety factor value of the invention with changing schematic diagram constantly.
Fig. 4 is each node location diagram of unit grid of the invention.
Specific embodiment
The present invention will be further described in detail below with reference to the embodiments, following embodiment be explanation of the invention and
The invention is not limited to following embodiments.
Embodiment 1:
Since ABAQUS procedural model construction ability is not strong, it is even more unable to do what one wishes especially to handle complicated seabed surface.
GOCAD program can satisfy this requirement.GOCAD can generate landform face quickly through CAD, if will by Surfer program
After landform carries out kriging analysis processing with finite difference calculus, three-dimensional landform will be more smooth.GOCAD grid generated with
It mesh shape required by ABAQUS consistent (hexahedral mesh) and can be exported with Excel file, this is just that the realization of interface is created
It may.
Based on above-mentioned discussion, stability analysis technology path are as follows: 1. by original CAD contour map import in GOCAD into
Row pre-treatment forms basic contour point；2. will generation contour import Surfer in using kriging analysis method into
Row data interpolating, then lead back to formation seabed surface in GOCAD program；3. treated, contour carries out three-dimensional geological modeling,
Export modeling grid data；4. grid data, which is imported application programming interfaces, carries out data processing, and generates new ABAQUS meter
Input file .inp is calculated, imports in ABAQUS and carries out operation.Its technology path schematic diagram is as shown in Figure 1.
In addition, existing research is achieved the interface between GOCAD and ABAQUS, but due to its grid interpretation sequence
It goes wrong, leads to that model can be built out, but be unable to operation, program reports an error.The present invention is based on Visual C# language platform,
Realize the grid data file that need to only import the derived Excel format after two program processing of GOCAD and Surfer, it is automatic to solve
Data are translated, the generation of the new grid of ABAQUS and subsidiary boundary condition can be completed.Not only model can import the present invention
In ABAQUS, and it simultaneously can correctly carry out operation and obtain corresponding result of study.The model conversion of the process controls skill
Art route map is as shown in Figure 2.
The seabed side slope three-dimensional method for analyzing stability based on Strength Reduction Method of the present embodiment, includes the following steps:
S1. region to be analyzed is selected, in the present embodiment, the long 1610m in region, wide 890m, wavelength 36.5m to be analyzed, week
Phase T=5s, wave height H=4m；
S2. it treats analyzed area and carries out pre-treatment:
S21. the data for being analysed to region, which import, forms three-dimensional landform figure in GOCAD；
S22. the three-dimensional landform figure of formation is imported in Surfer, and forms seabed exterior view after interpolation processing；
S23. seabed exterior view is imported in GOCAD, by being sequentially formed grid by point-line-face-body and being formed irregularly
Upper surface under the conditions of three-dimensional bottom relief map；
S24. the three-dimensional bottom relief map in GOCAD is exported as into excel file；
S3. by derived excel file, ABAQUS is generated by ABAQUS numerical value interface routine and imports file .inp, number
Value interface routine comprises the following processes:
S31. excel file is imported into numerical value interface routine；
S32. to the three-dimensional coordinate parameter of each node of generation unit grid in excel file, i.e. p0 to p7 (such as Fig. 4
It is shown), it modifies in the way of following table:
S33. ABAQUS is exported as from numerical value interface routine imports file .inp；
S4. self-weight stress field is constructed:
S41. it writes and imports file .inp, the direction x that boundary condition is limitation front and back two sides is displaced, the y on left and right two sides
Direction is unique；Bottom surface limits the displacement on its two sides xy；
S42. after the completion of writing, it will import in file .inp importing ABAQUS and generate model；
S43. the corresponding module in ABAQUS is executed, by six components of stress of the unit center point in self-weight stress field
F11, F22, F33, F12, F13, F23 are output to external file .txt and export；
S44. the file in external file .txt other than data line is deleted, and increases model before the data of each unit
Name, format are " -1. serial number of model name ", and each be about to six components of stress belonging to the same unit and separated with comma；
S5. stability analysis is carried out:
S51. the gravitational field file after conversion is led back among former ABAQUS model, surface is generated at the top of model；
S52. defined analysis step-length, and reduction operation is carried out to cohesive strength and internal friction angle, and be input to input ABAQUS
Among program, formula is as follows:
Wherein, C,Respectively cohesive strength and internal friction angle, Cm,Cohesive strength and internal friction angle after being respectively reduced,
Fm is strength reduction factor, numberical range 0.5-10；
S53. in ABAQUS, analysis seaway load is at t=0, t=0.25T, t=0.5T and t=0.75T moment, respectively
Apply the wave pressure of vertical direction different moments on sea bed surface, according to small amplitude wave theory, the dynamic pressure of water body can be by formula
(3) it indicates:
As z=-h, seabed surface pressure are as follows:
Wherein, z is corrugated relative altitude, and H is wave height, and σ is fluctuation circular frequency, and ρ is fluid density, and k is wave number, and h is quiet
The water surface to seabed vertical range；
S54. model is integrally calculated using ABAQUS, output variable is safety coefficient FSWith sea bottom surface selected point
Displacement；
S6. logarithm calculated result is analyzed:
S61. reduction integral unit displacement isogram analysis: according in t=0, t=0.25T, t=0.5T and t=
When tetra- moment of 0.75T calculate termination, the reduction integral unit displacement isogram being respectively formed in ABAQUS, if occurring from more
A sliding is developed towards single circle sliding surface, then slides the trend separated towards multiple sliding surfaces by single, then carries out S62；
S62. seabed slope stability is judged by safety coefficient:
S621. by safety coefficient FSDisplacement with sea bottom surface selected point is provided as output variable using ABAQUS
Combine function obtains the safety coefficient F of different momentsSWith the variation relation figure of displacement；
S622. pass through safety coefficient FSThe corresponding relationship at value of safety factor value and moment is obtained with the variation relation figure of displacement,
If the wave trend of dipping and heaving is presented with variation constantly for value of safety factor value, the minimum value of value of safety factor value is taken, and utilizes " building
Slope project technical specification " (GB 50330-2013) judge whether side slope is stable.
In above-mentioned S21, the data in region to be analyzed are with cad Software Create and with the region to be analyzed of .dxf format preservation
Bottom contour bathymetric data.
In above-mentioned S53, analysis step-length is at least a cycle T, and cycle T is wave cycle, completes once sinusoidal curve
Time.
In above-mentioned S53, the calculation method of wave number k are as follows:
S531. in MATLAB environment, if wave number is unknown number x, calculation formula are as follows:
F=inline (' x- (/ (g*tanh (x*h))) ')
S532. the range for taking f is -100 to 100；
S533. zero point of the f between -20 to 20 is searched；
S534. after successive ignition, the value of wave number k is obtained.
The calculation method of wave number k specifically:
In above-mentioned S43, in order to extract the field data of self-weight stress field, need to initially enter Visualization
Post-processing module opens corresponding calculated result file.Again by six components of stress of the unit center point in self-weight stress field
It is output in external file .txt and exports, just can be carried out in the model being then imported with field data under acting by external hydrostatic pressure into one
The reduction of step is analyzed.But derived field data cannot be directly read by ABAQUS/CAE, it is necessary to by passing through after processing
ABAQUS/command module is read.
In above-mentioned S44, it will increase before the data of file and each unit other than deletion data line in external file .txt
Add model name, format is " -1. serial number of model name ", and each stress number for being about to different stress directions belonging to the same unit
According to that is, six components of stress F11, F12, F13, F12, F13, F23 are separated with comma, such as former export data are as follows:
It is translated the file by field file converter are as follows:
Model name -1.1, F11, F12, F13, F12, F13, F23
Model name -1.2, F11, F12, F13, F12, F13, F23
Model name -1.3, F11, F12, F13, F12, F13, F23
In above-mentioned S622, " Technique Code for Building Slope Engineering " (GB 50330-2013) regulation: 5.3.1 is except check operating condition
Outside, slope stability state is divided into stable, basicly stable, understable and unstable four kinds of states, can be according to slope stability system
Number is determined by table 5.3.1.
Table 5.3.1 slope stability state demarcation
Note: Fst--- safety factor of slope.
5.3.2 safety factor of slope Fst should be determined by table 5.3.2, when stability factor of slope is less than stability of slope
Side slope is answered to be handled when safety coefficient.
Table 5.3.3 safety factor of slope Fm
Note: when 1. earthquake operating condition, safety coefficient is only applicable to the side slope without important buildings or structures in slumping area；
2. pair geological conditions is very responsible or the CR Critical slope project of consequence of failure, buckling safety factor should be mentioned suitably
It is high.
Above-mentioned FmFor strength reduction factor, numberical range is chosen between 0.5-10, in the present embodiment using
In addition, it should be noted that, the specific embodiments described in this specification, the shape of parts and components are named
Title etc. can be different.The equivalent or simple change that all structure, feature and principles described according to the invention patent design are done, is wrapped
It includes in the scope of protection of the patent of the present invention.Those skilled in the art can be to described specific implementation
Example is done various modifications or additions or is substituted in a similar manner, and without departing from structure of the invention or surmounts this
Range as defined in the claims, is within the scope of protection of the invention.
Claims (4)
1. a kind of seabed side slope three-dimensional method for analyzing stability based on Strength Reduction Method, it is characterized in that: including the following steps:
S1. region to be analyzed is selected；
S2. it treats analyzed area and carries out pre-treatment:
S21. the data for being analysed to region, which import, forms three-dimensional landform figure in GOCAD；
S22. the three-dimensional landform figure of formation is imported in Surfer, and forms seabed exterior view after interpolation processing；
S23. seabed exterior view is imported in GOCAD, by sequentially forming grid by point-line-face-body, is formed irregular
Three-dimensional bottom relief map under the conditions of upper surface；
S24. the three-dimensional bottom relief map in GOCAD is exported as into excel file；
S3. by derived excel file, ABAQUS is generated by ABAQUS numerical value interface routine and imports file .inp, numerical value connects
Mouth program comprises the following processes:
S31. excel file is imported into numerical value interface routine；
S32. to the three-dimensional coordinate parameter of each node of generation unit grid in excel file, the i.e. three-dimensional coordinate of p0 to p7
Parameter is modified in the way of following table:
S33. ABAQUS is exported as from numerical value interface routine imports file .inp；
S4. self-weight stress field is constructed:
S41. it writes and imports file .inp, the direction x that boundary condition is limitation front and back two sides is displaced, the direction y on left and right two sides
Uniquely, bottom surface limits the displacement on its two sides xy；
S42. after the completion of writing, it will import in file .inp importing ABAQUS and generate model；
S43. execute ABAQUS in corresponding module, by six components of stress F11 of the unit center point in self-weight stress field,
F22, F33, F12, F13, F23 are output to external file .txt and export；
S44. the file in the external file .txt other than data line is deleted, and increases model before the data of each unit
Name, format are " -1. serial number of model name ", and each be about to six components of stress belonging to the same unit and separated with comma；
S5. stability analysis is carried out:
S51. the gravitational field file after conversion is led back among former ABAQUS model, surface is generated at the top of model；
S52. defined analysis step-length, and reduction operation is carried out to cohesive strength and internal friction angle, and be input to input ABAQUS program
Among, formula is as follows:
Wherein, C,Respectively cohesive strength and internal friction angle, Cm,Cohesive strength and internal friction angle after being respectively reduced, FmFor
Strength reduction factor, numberical range 0.5-10；
S53. in ABAQUS, seaway load is analyzed at t=0, t=0.25T, t=0.5T and t=0.75T moment, respectively in sea
Bed surface applies the wave pressure of vertical direction different moments, and according to small amplitude wave theory, the dynamic pressure of water body can be by formula (3) table
Show:
As z=-h, seabed surface pressure are as follows:
Wherein, z is corrugated relative altitude, and H is wave height, and σ is fluctuation circular frequency, and ρ is fluid density, and k is wave number, and h is standing level
To the vertical range in seabed, T is time cycle unit, and each period is 5 seconds；
S54. model is integrally calculated using ABAQUS, output variable is the position of safety coefficient Fs and sea bottom surface selected point
It moves；
S6. logarithm calculated result is analyzed:
S61. reduction integral unit displacement isogram analysis: according in t=0, t=0.25T, t=0.5T and t=0.75T tetra-
When a moment calculates termination, the reduction integral unit displacement isogram being respectively formed in ABAQUS, if occurring from multiple slidings
It is developed towards single circle sliding surface, then slides the trend separated towards multiple sliding surfaces by single, then carry out S62, wherein T is the time
Unit；
S62. seabed slope stability is judged by safety coefficient:
S621. using the displacement of safety coefficient FS and sea bottom surface selected point as output variable, the Combine provided using ABAQUS
Function obtains the safety coefficient FS of different moments with the variation relation figure of displacement；
S622. the corresponding relationship at value of safety factor value and moment is obtained with the variation relation figure of displacement by safety coefficient FS, if peace
Complete set numerical value carves the wave trend that dipping and heaving is presented in variation at any time, takes the minimum value of value of safety factor value, and utilize " building slope
Engineering legislation " (GB50330-2013) judge whether side slope is stable.
2. the seabed side slope three-dimensional method for analyzing stability according to claim 1 based on Strength Reduction Method, it is characterized in that:
In the S21, the data in region to be analyzed are with cad Software Create and with the seabed in the region to be analyzed of .dxf format preservation
Isobath bathymetric data.
3. the seabed side slope three-dimensional method for analyzing stability according to claim 1 based on Strength Reduction Method, it is characterized in that:
In the S53, analysis step-length is at least a cycle T, the cycle T be wave cycle complete once sinusoidal curve when
Between.
4. the seabed side slope three-dimensional method for analyzing stability according to claim 1 based on Strength Reduction Method, it is characterized in that:
In the S53, the calculation method of wave number k are as follows:
S531. in MATLAB environment, if wave number is unknown number x, calculation formula are as follows:
F=inline (' x- (/ (g*tanh (x*h))) ')
S532. the range for taking f is -100 to 100；
S533. zero point of the f between -20 to 20 is searched；
S534. after iteration several times, the value of wave number k is obtained.
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| CN106872081A (en) * | 2017-03-28 | 2017-06-20 | 北京科技大学 | Stress monitoring method for early warning based on the natural frequency of vibration |
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| CN111581836B (en) * | 2020-05-14 | 2023-12-15 | 国网电力空间技术有限公司 | Power transmission line landslide body stability calculation method |
| CN112257140B (en) * | 2020-09-16 | 2022-10-25 | 南京工业大学 | Safety coefficient calculation method for seabed slope stability |
| CN114036785B (en) * | 2021-09-24 | 2024-04-05 | 自然资源部第二海洋研究所 | Deep-sea hydrothermal area deep-structure stress field simulation method based on ocean shell speed structure |
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| JP2003213591A (en) * | 2002-01-18 | 2003-07-30 | Dexter Corp | Improvement of dry flexural strength of cold injection packaging material |
| CN105224704A (en) * | 2014-06-25 | 2016-01-06 | 中国科学院海洋研究所 | A kind of evaluation method of seabed erosion |
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