CN110006568A - It is a kind of to obtain the method for three-dimensional ground stress using core and its obtain system - Google Patents
It is a kind of to obtain the method for three-dimensional ground stress using core and its obtain system Download PDFInfo
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Abstract
The present invention relates to geostress survey technical fields, more particularly, to a kind of method and its acquisition system for obtaining three-dimensional ground stress using core.The method for obtaining three-dimensional ground stress includes: S1: determining the numerical value of known parameters and the reasonable value range of unknown parameter；S2: the test data of satisfaction is generated；S3: back analysis is carried out to test data；S4: input parameter value is matched within the scope of the reasonable value of unknown parameter；S5: back analysis is carried out according to input parameter value again, obtains three-dimensional ground stress.It includes artificial neural network model module, back analysis model module, evolutionary computation module and controller that three-dimensional ground stress, which obtains system,；Controller is connect with artificial neural network model module, back analysis model module and evolutionary computation module respectively.The present invention carries out Proper Match output parameter, and then the three-dimensional ground stress parameter of estimation can be made accurate, improves the efficiency for obtaining three-dimensional ground stress by carrying out inverting and evolutionary computation to the test data of generation.
Description
Technical field
The present invention relates to geostress survey technical fields, more particularly, to a kind of side for obtaining three-dimensional ground stress using core
Method and its acquisition system.
Background technique
Crustal stress be the primary stress being present in earth's crust rock mass and solid earth important physical property parameters it
One.Crustal stress is the root strength for causing rock mass deformation, unstability and destruction, and influences the deeps such as petroleum, shale gas, hot dry rock
The important parameter of energy extraction.
Currently, the means of the main dependence of geostress survey are drilling and boring and coring, for example, core anelasticity restoring method
(ASR method) be exactly it is a kind of rock mass stress environment is detached from according to core after, test inelastic deformation and then estimate three-dimensional principal stress
A kind of common method.However, this method operation sequence is complicated, influences and disturbing factor is more and relatively time-consuming.It is general next
It says, the ASR method testing time at least 7 days, it is sometimes desirable to be up to one month.Therefore, it is difficult to promote and apply rapidly, on a large scale.
Core, due to the squeezing action departing from stress field, will occur two kinds of deformations, remove after taking out in earth's crust rock mass
Except the inelastic deformation that ASR method detecting earth stress is relied on, there are also the flexible deformations of momentary recovery.Due to flexible deformation from
That time that drill bit core-drilling is formed has begun generation, once drilling through to obtain core completely, that is, is basically completed elastic deformation
Recovery, the green diameter of core is difficult to measure and utilize, this also will be to determining three-dimensional ground stress value using core flexible deformation
Trial bring and be difficult to determining difficulty.
Existing method is mainly the core for utilizing vertical drilling to take out, the deformation of measurement core diameter and appreciable levels stress
Difference.But Shang Buneng obtains specific principal stress magnitude, such as vertical drilling coring, maximum horizontal principal stress
And minimum horizontal principal stress.Wherein, cylindric core is detached from behind crustal stress field and occurs initial before flexible deformation is restored
Proper circle diameter d0Size can not directly survey, this, which is directly resulted in, can not reliably obtain maximum horizontal principal stress and minimum level
The specific magnitude of principal stress.This also largely limits the application effect and promotion prospect of existing method.
Summary of the invention
The purpose of the present invention is to provide a kind of to obtain the method for three-dimensional ground stress using core and its obtain system, with solution
Certainly insoluble core difficult point and problem in the prior art and method.
The method provided by the invention for obtaining three-dimensional ground stress, includes the following steps:
S1: the vertical principal stress S of known parameters is determinedv, core radial direction structural strain's value dmax、dminNumerical value and unknown parameter
Young's modulus E, Poisson's ratio v, minimum and maximum horizontal principal stress ShmaxAnd Shmin, the initial proper circle diameter d of core0Reasonable value
Range；
S2: the test data of all satisfactions is generated；
S3: back analysis is carried out to test data；
S4: input parameter value is matched within the scope of the reasonable value of unknown parameter；
S5: back analysis is carried out according to input parameter value again, finally obtains three-dimensional ground stress.
Further, step S2, step S3 and step S4 carries out parallelization processing.
Further, it before determining known parameters, needs to obtain core radial direction structural strain's value d by testmaxAnd dmin,
As known parameters.
Further, before determining known parameters, need first to carry out the basic physical properties test of core.
Further, after obtaining three-dimensional ground stress, parameter value is verified.
Further, the method verified to parameter value is multiple-authentication.
Further, multiple-authentication includes at least: finite element modelling verifying and the verifying of existing formula.
Further, the formula of three-dimensional ground stress is estimated are as follows:
The present invention also provides a kind of three-dimensional ground stress to obtain system comprising artificial neural network model module, inverting point
Analyse model module, evolutionary computation module and controller；
The controller respectively with the artificial neural network model module, the back analysis model module and the evolution
Computing module connection, for making the artificial neural network model module, the back analysis model module and the evolutionary computation
The operation of module carries out parallelization processing.
Further, the controller is also connected with optimization module, for optimizing the range of unknown parameter.
It is provided by the invention to obtain the method for three-dimensional ground stress using core and its obtain system, pass through the test to generation
Data carry out inverting and evolutionary computation, carry out Proper Match output parameter, and then enable to the three-dimensional ground stress parameter of estimation
It is more accurate, and improve the efficiency for obtaining three-dimensional ground stress.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is bullet of the core before and after stress relieving in the method provided in an embodiment of the present invention for obtaining three-dimensional ground stress
Property deformation schematic diagram；
Fig. 2 is the flow diagram of the method provided in an embodiment of the present invention for obtaining three-dimensional ground stress.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
According to Elasticity classical theory, for isotropic cylindric core that vertical drilling drills through, core is in original
The crustal stress that position is subject to is released at once.Cylindric core is after being detached from crustal stress field and generation flexible deformation restores it
Preceding initial diameter is d0, and cylindrical cross-section is a proper circle at this time.Assuming that the core drilled through be it is complete, without microfissure and
The interference of inelastic strain.Core will generate flexible deformation after stress relieving, and deflection and the crustal stress released are horizontal
It is directly proportional, such as Fig. 1.So, for a vertical drilling, in Fig. 1 under plane stress condition, maximum horizontal principal stress ShmaxWith
Minimum horizontal principal stress ShminWhen releasing under the deformation pattern of core, in the core plane directly handed over bore hole axis, it will produce respectively
Raw tensile strain, as shown in formula 1-2.
Separately there is cylindric core cross section strain stresshmaxAnd εhminThere is following relational expression to express:
Wherein, εhmaxFor ShmaxMaximum stretching strain on direction, εhminFor ShminMinimum stretching strain on direction, SvIt is vertical
Principal stress, E are the Young's modulus of rock, and v is Rock Poisson Ratio Using.dmaxFor maximum core diameter direction, dminIt is straight for minimum rock core
Diameter direction, d0The initial diameter of proper circle before restoring for core elasticity.It is obvious that the cylinder core section after flexible deformation is restored is
One ellipse, long axis dmax, short axle dmin, as shown in Figure 1.
Aforesaid equation is solved, minimum and maximum horizontal principal stress S can be acquired respectivelyhmax、Shmin, such as formula combinations (5).
In addition, vertical principal stress is equal to the sum of the weight of overlying rock, it is easy to directly obtain for vertical drilling.
So, for the difference ε of horizontal strainhmax-εhmin, there is following formula:
Due to d0Positioned at denominator position, d is approximately equal on magnitudemin, and for diameter distortion difference magnitude compared with
It greatly, can be by d therefore in formula (6)0Instead of dmin.In the case, it need to only measure to obtain cylindric rock after elasticity is restored
The minimum and maximum diameter of core and the elastic parameter E and v of rock, can acquire level error stress value, then formula combinations (5-
1) as follows:
Obviously, d is enabled in formula combinations following formulaminInstead of d0It is feasible and sets up, approximate error can be ignored, and
Above formula in combination is due to also having 2d on molecular position0, it is clear that above-mentioned substitution can not be done；Otherwise significant error will be introduced.
Therefore, if the accurate assessment initial proper circle diameter d of core can be found0Value, then can pass through solving equations
(7), it is easy to which ground obtains maximum horizontal principal stress ShmaxWith minimum horizontal principal stress ShminOccurrence, and three-dimensional principal stress
Size.
Method used in the present invention and implementation system can efficiently solve this problem.
The present invention has derived the minimum and maximum horizontal principal stress S based on cylindric core cross-sectional deformation amounthmax、Shmin
Calculation formula (8).
The present invention establishes a set of calculation procedure, using formula (8) as theoretical basis, finally seeks obtaining d0It is accurate
Value.
Before starting solution, for vertical drilling, with removing coring depth location, vertical stress SvIt is known.
The method provided by the invention for obtaining three-dimensional ground stress, as shown in Fig. 2, including the following steps:
S1: the numerical value of known parameters and the value range of unknown parameter are determined, wherein known parameters include: that vertical master answers
Power Sv, maximum core radial direction structural strain's value dmaxWith minimum core radial direction structural strain's value dmin, unknown parameter includes: Young mould
Measure E, Poisson's ratio v, maximum horizontal principal stress Shmax, minimum horizontal principal stress ShminWith the initial proper circle diameter d of core0；
S2: the test data of all satisfactions is generated；
S3: back analysis is carried out to test data；
S4: input parameter value is matched within the scope of the reasonable value of unknown parameter；
S5: back analysis is carried out according to input parameter value again, finally obtains three-dimensional ground stress.
In the present embodiment, specific step are as follows:
Determine known parameters Sv, core radial direction structural strain's value dmax、dminNumerical value, and determine unknown parameter rationally take
It is worth range, calculates step and time to reduce.Unknown parameter has rock Young's modulus E, Poisson's ratio v, minimum and maximum horizontal master
Stress ShmaxAnd Shmin, the initial proper circle diameter d of core0。
Using coring bit internal diameter r, rock mechanics experiment parameter E and v, the purpose of this step be tentatively optimize and reduce it is unknown
The value interval of parameter increases operation efficiency.
On the basis of first two steps, all test data set for meeting formula (8) are generated using artificial neural network algorithm.
After establishing artificial neural network algorithm, the inverting point based on input parameter (measured value) and output parameter (predicted value)
Model is analysed, core d is establishedmaxAnd dminWith the relationship of objective function (8).
Sought in a more wide unknown parameter test data set using evolution algorithm and matching can satisfy
The input parameter value of the requirement of objective function.
Each data of test data set are executed into operation program using back analysis model.
Once all test after data acquisition system calculating terminate, meet objective function requirement rock mechanics experiment parameter E and
V, minimum and maximum horizontal principal stress ShmaxAnd Shmin, the initial proper circle diameter d of core0By whole generations.
Further, step S2, step S3 and step S4 carries out parallelization processing.
In order to ensure the computational efficiency and speed of rapid S2, step S3 and step S4 step by step, in the present embodiment, by above-mentioned steps
Parallelization processing is carried out, to improve computational efficiency and speed.
Further, it before determining known parameters, needs to obtain core radial direction structural strain's value d by testmaxAnd dmin,
As known parameters.
After drilling core drills through ground, need to test core radial direction structural strain's value d at the first timemaxAnd dmin, and make
To solve known quantity.Fresh-core should carry out the test of core radial deformation after taking out in drilling as early as possible.
Before test, in order to avoid blockage effect caused by core dehydration, core is put into tinfoil paper hermetic bag and is saved.
The cylindrical surface for testing core should as smooth as possible, regular shape, no obvious joint.
Further, before determining known parameters, need first to carry out the basic physical properties test of core.
The basic physical properties test for carrying out core, mainly gets parms are as follows: natural density ρ, shear wave velocity VS, the Young of rock
Modulus E, Rock Poisson Ratio Using v.
Since the core length for carrying out radial deformation test is limited, it is only capable of making a small amount of rock mechanics standard sample
Product, so the Young's modulus E of rock is determined by Rock Mechanics Test, the accuracy of Rock Poisson Ratio Using v cannot fully ensure that,
Also the calculating of formula combinations (8) cannot be participated in as proper known quantity, but can be used as important reference, it is excellent
The value range changed and reduce it as unknown quantity.
Further, after obtaining three-dimensional ground stress, parameter value is verified.
After completing above-mentioned steps, that is, the wheel that has been finished calculates appraisal procedure, need prediction value parameter to output into
Row verifying.
When logarithm is verified, if whole output parameters meet the requirements, termination is calculated.
If cannot ensure that whole parameters meet the requirements, by probability analysis, the parameter for meeting optimal solution is found, it may
To be one or several, desired parameter will be unsatisfactory for and rejected, and then be recycled into next round calculating and appraisal procedure.
It loops back and forth like this, until all output parameters meet the requirements, meets verification result.
So far, terminated with the method execution that drilling core deforms estimation three-dimensional ground stress.
Further, the method verified to parameter value is multiple-authentication.
Pass through multiple-authentication, it can be ensured that the accuracy of the estimated value of three-dimensional ground stress.
Further, multiple-authentication includes at least: finite element modelling verifying and the verifying of existing formula.
Finite element modelling is verified, is built based on the cylindric core that rock mechanics experiment parameter E and v are physical property
Mould, and with d0To deform primary condition, establish with the minimum and maximum horizontal principal stress S of output parameterhmaxAnd ShminFor primary stress
The cylindric core section deformation result of simulation gained and core are surveyed d by conditionmaxAnd dminValue compares, to judge in terms of epicycle
Whether reliable calculate result.
Existing formula is verified, with formula combinations (7) for objective function.According to aforementioned reasons, for maximum and
The calculating of minimum horizontal principal stress, core proper circle initial diameter d0It is the most key element and most important assessment and really
Set the goal parameter.Therefore, this verification method is with d0For invariant, remaining dependent variable and maximum, minimum horizontal principal stress is measured
Fitting degree.
The present invention also provides a kind of three-dimensional ground stress to obtain system comprising artificial neural network model module, inverting point
Analyse model module, evolutionary computation module and controller；Controller respectively with artificial neural network model module, back analysis pattern die
Block is connected with evolutionary computation module, for making artificial Model of Neural Network module, back analysis model module and evolutionary computation module
Operation carry out parallelization processing.
In the present embodiment, pass through artificial neural network model module, back analysis model module and evolutionary computation module pair
All parameters carry out parallelization processing, are coordinated by the parameter that controller handles parallelization, and then can be effective
Pass through computational efficiency.
Further, controller is also connected with optimization module, for optimizing the range of unknown parameter.
Optimization module utilizes coring bit internal diameter r, rock mechanics experiment parameter E and v, is able to carry out preliminary optimization and reduces
The value interval of unknown parameter increases operation efficiency.
Further, the controller is also connected with authentication module, for verifying to the parameter of output.
In the present embodiment, authentication module includes finite element simplation verification and the verifying of existing formula.
Finite element modelling is verified, is built based on the cylindric core that rock mechanics experiment parameter E and v are physical property
Mould, and with d0To deform primary condition, establish with the minimum and maximum horizontal principal stress S of output parameterhmaxAnd ShminFor primary stress
The cylindric core section deformation result of simulation gained and core are surveyed d by conditionmaxAnd dminValue compares, to judge in terms of epicycle
Whether reliable calculate result.
Existing formula is verified, with formula combinations (7) for objective function.According to aforementioned reasons, for maximum and
The calculating of minimum horizontal principal stress, core proper circle initial diameter d0It is the most key element and most important assessment and really
Set the goal parameter.Therefore, this verification method is with d0For invariant, remaining dependent variable and maximum, minimum horizontal principal stress is measured
Fitting degree.
Termination is calculated if whole output parameters meet the requirements by double verification.
If cannot ensure that whole parameters meet the requirements, by probability analysis, the parameter for meeting optimal solution is found, it may
To be one or several, desired parameter will be unsatisfactory for and rejected, and then be recycled into next round calculating and appraisal procedure.
It loops back and forth like this, until all output parameters meet the requirements, meets verification result.
It should be pointed out that being in the present embodiment double verification, more multiple-authentication can also be, as long as can protect
In the case where demonstrate,proving efficiency, increase verification mode, and then increase the accuracy of output parameter.
It may also be noted that in the present embodiment, the mode of verifying is that finite element modelling verifying and existing formula are verified,
But it is not limited solely to above two verification mode, can also be other verification modes, as long as can be to the ginseng of output
Number accuracy is verified.
It is provided by the invention to obtain the method for three-dimensional ground stress using core and its obtain system, pass through the test to generation
Data carry out inverting and evolutionary computation, carry out Proper Match output parameter, and then enable to the three-dimensional ground stress parameter of estimation
It is more accurate, and improve the efficiency for obtaining three-dimensional ground stress.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
In addition, it will be appreciated by those of skill in the art that although some embodiments in this include institute in other embodiments
Including certain features rather than other feature, but the combination of the feature of different embodiment means in the scope of the present invention
Within and form different embodiments.For example, in claims above, embodiment claimed it is any it
One can in any combination mode come using.The information disclosed in the background technology section is intended only to deepen to the present invention
General background technology understanding, and be not construed as recognizing or imply that information composition has been this field skill in any form
The prior art well known to art personnel.
Claims (10)
1. a kind of method for obtaining three-dimensional ground stress using core, which comprises the steps of:
S1: the numerical value of known parameters and the value range of unknown parameter are determined, wherein known parameters include: vertical principal stress Sv、
Maximum core radial direction structural strain's value dmaxWith minimum core radial direction structural strain's value dmin, unknown parameter include: Young's modulus E,
Poisson's ratio v, maximum horizontal principal stress Shmax, minimum horizontal principal stress ShminWith the initial proper circle diameter d of core0；
S2: the test data of all satisfactions is generated；
S3: back analysis is carried out to test data；
S4: input parameter value is matched in the value range of unknown parameter；
S5: back analysis is carried out according to input parameter value again, finally obtains three-dimensional ground stress.
2. the method according to claim 1 for obtaining three-dimensional ground stress using core, which is characterized in that step S2, step
S3 and step S4 carries out parallelization processing.
3. the method according to claim 1 for obtaining three-dimensional ground stress using core, which is characterized in that determining known ginseng
Before number, need to obtain core radial direction structural strain's value d by testmaxAnd dmin, as known parameters.
4. the method according to claim 1 for obtaining three-dimensional ground stress using core, which is characterized in that determining known ginseng
Before number, need first to carry out the basic physical properties test of core.
5. the method according to claim 1 for obtaining three-dimensional ground stress using core, which is characterized in that obtaining dimensionally
After stress, parameter value is verified.
6. the method according to claim 5 for obtaining three-dimensional ground stress using core, which is characterized in that carried out to parameter value
The method of verifying is multiple-authentication.
7. the method according to claim 6 for obtaining three-dimensional ground stress using core, which is characterized in that multiple-authentication is at least
It include: finite element modelling verifying and the verifying of existing formula.
8. the method according to claim 1 for obtaining three-dimensional ground stress using core, which is characterized in that estimation is dimensionally answered
The formula of power are as follows:
9. a kind of three-dimensional ground stress obtains system, which is characterized in that including artificial neural network model module, back analysis pattern die
Block, evolutionary computation module and controller；
The controller respectively with the artificial neural network model module, the back analysis model module and the evolutionary computation
Module connection, for making the artificial neural network model module, the back analysis model module and the evolutionary computation module
Operation carry out parallelization processing.
10. three-dimensional ground stress according to claim 9 obtains system, which is characterized in that the controller is also connected with excellent
Change module, for optimizing the range of unknown parameter.
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| CN115075810A (en) * | 2022-07-01 | 2022-09-20 | 中国地质科学院地质力学研究所 | Three-dimensional ground stress measurement method for coring on side wall of drill hole |
| CN115584966A (en) * | 2022-10-28 | 2023-01-10 | 中国地质科学院地质力学研究所 | Method for obtaining three-dimensional ground stress by utilizing triaxial rock mechanics experiment |
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| CN111366452A (en) * | 2020-03-26 | 2020-07-03 | 北京科技大学 | Method for measuring energy storage level of self-energy-storage rock mass |
| CN111366452B (en) * | 2020-03-26 | 2021-01-29 | 北京科技大学 | Method for measuring energy storage level of self-energy-storage rock mass |
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| CN112528543B (en) * | 2020-12-14 | 2022-11-01 | 中国葛洲坝集团第三工程有限公司 | Method and device for analyzing ground stress and processing equipment |
| CN112699545A (en) * | 2020-12-23 | 2021-04-23 | 重庆大学 | Method and system for establishing three-dimensional processing diagram based on improved artificial neural network model |
| CN115075810A (en) * | 2022-07-01 | 2022-09-20 | 中国地质科学院地质力学研究所 | Three-dimensional ground stress measurement method for coring on side wall of drill hole |
| CN115017833A (en) * | 2022-08-09 | 2022-09-06 | 中国科学院武汉岩土力学研究所 | High ground stress soft rock body ground stress calculation method based on deep neural network |
| CN115584966A (en) * | 2022-10-28 | 2023-01-10 | 中国地质科学院地质力学研究所 | Method for obtaining three-dimensional ground stress by utilizing triaxial rock mechanics experiment |
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