CN110186727A - A kind of dynamic test model clay and preparation method for simulating Tianjin silty clay - Google Patents
A kind of dynamic test model clay and preparation method for simulating Tianjin silty clay Download PDFInfo
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- CN110186727A CN110186727A CN201910474749.2A CN201910474749A CN110186727A CN 110186727 A CN110186727 A CN 110186727A CN 201910474749 A CN201910474749 A CN 201910474749A CN 110186727 A CN110186727 A CN 110186727A
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Abstract
The invention belongs to soil mechanics to test field, provide a kind of related dynamic model test model clay and its preparation method for simulating Tianjin silty clay.Model clay includes the component of following mass percentage content: sawdust 18%, river sand 27%, silty clay 55%, moisture content 50%.Preparation method is the following steps are included: (1) weighs sawdust, river sand and silty clay according to the ratio；(2) each component is added to water after mixing and mix is uniform, compared with prior art, the model clay that the present invention is prepared meets main similarity relation from Tianjin silty clay under different confining pressures, creates simultaneously basisFunction quantitative analysis obtains the G/G of model clay Yu prototype soilmax‑γDynamic characteristic curves similarity is higher.In addition, being able to carry out other simulations in relation to dynamic model test soil property by the when moisture content of matching for adjusting sawdust, river sand and silty clay, can create through the inventionFunction quantitative analysis determines the proportion of other model clays.
Description
Technical field
The invention belongs to soil mechanics to test field, be related to the model clay that a kind of civil engineering and underground engineering use, especially
It is related to a kind of dynamic test model clay technology for simulating Efficiency in Buildings in Tianjin Area silty clay.
Background technique
Underground structure and soil, the interaction theory of superstructure and prematurity under geological process so far, are more preferable
The dynamic response for restoring tunnel and superstructure under geological process, usually needs to carry out earthquake mould in dependency structure Aseismic Design
Intend shaketalle test and certain testing data is provided；Superstructure-soil-tunnel Interaction System shaking-table test
In a critical issue be that the acceleration likelihood ratio between system each section should be mutually matched, therefore the design of model clay is to closing
It is important.
Under normal circumstances, the model clay in engineering test should have property below: (1) the selection side about analog material
Face is considered as selection and obtains convenient and relatively reasonable cost material；(2) property of analog material is answered more stable, in model
Soil is prepared and is not changed in the process with the variation of the environment such as ambient temperature to model casing filling；(3) model clay is convenient for matching
System and shake table filling；(4) likelihood ratio in relation to model clay and prototype soil dynamics parameter can be by changing each material of model clay
Proportion regulated and controled.
Domestic and international some scholars have carried out certain research to the preparation of model clay, are partially summarized as follows.
Equality is kept still with dynamic shear modulus as main similar index, reduces dynamic cut using sawdust is added in prototype soil
Shear modulu, acceleration likelihood ratio SaTarget value be 1, and actual value is 4.65, does not consider model clay and prototype soil G/Gmax-
γ dynamic characteristic curves similitude.
Chen Hongjuan etc. is based on structure and the native period consistent principle of the likelihood ratio, using the predominant period of soil as similar index,
The predominant period T=4h/v of Site Soils, it is calculated by the theory of similarity and knows that model soilborne plant disease is more much smaller than prototype place,
Therefore sawdust is added in prototype soil to reduce shear wave velocity, target value SlSρ/SE=1, actual result 0.15 does not consider mould
Type soil and prototype soil G/Gmax- γ dynamic characteristic curves similitude.
Wang Zhijia strains γ using silty clay as prototype soil with the reference of model clay and prototype soilrThe likelihood ratio is 1 and the two
G/GmaxGamma curve is similar to be used as similar index, and model soil material is clay, river sand and water, is finally obtained and silty clay
G/GmaxThe similar model clay of gamma curve, and be 0.95 with reference to the strain likelihood ratio, set similar purpose is substantially met, but not
Consider whether soil is consistent with the acceleration likelihood ratio of underground utilities.
The more preparation for leading to model clay of complicated variety and mechanical stae parameter of soil is more difficult, has so far
In terms of the preparation for closing shake table Dynamic Characteristics Test model clay, most researchers are to meet main similarity relation as target, but institute
It obtains test result often to fail preferably to meet target, the especially G/G in model clay and prototype soilmax- γ dynamic characteristic curves
Similitude from the aspect of it is less, and do not do stringent quantitative analysis.
Summary of the invention
The purpose of the present invention is to provide it is a kind of simulate Efficiency in Buildings in Tianjin Area silty clay dynamic model test model clay and
Its preparation method, the model clay invented are directed to the distinctive mechanical property of Efficiency in Buildings in Tianjin Area silty clay, have comprehensively considered model clay
It is main with prototype silty clay dynamic shear modulus ratio-shearing strain dynamic characteristic curves similitude and model clay and prototype soil
Similarity relation makes the acceleration likelihood ratio phase of superstructure-soil-tunnel Interaction System each section prototype with model
Match, can more preferably restore the dynamic response in tunnel and superstructure under geological process；In addition, by adjusting sawdust, river sand and powder
Matter clay is able to carry out other in relation to dynamic with when moisture content and the model clay created using the present invention proportion determination method
The simulation of power model test soil property.
Shaketalle test determines the similarity relation between each physical quantity, but related soil-structure according to Buckingham Buckingham theorem
Shaking table model, superstructure, soil and tunnel prototype and all parameters of model can not be made all to fully meet phase
Like relationship, therefore important parameter is typically chosen as main similar Design, some non-key parameter likelihoods ratio are then permitted
Permitted partial distortion occur；Design studies of the present invention in relation to model clay are using the dynamic shear modulus ratio of model clay and prototype soil as master
Want similar parameter, similarity relation governing equation Sa=SG/SρSl, wherein SaFor the acceleration likelihood ratio, SGIt is similar for dynamic shear modulus
Than SρFor the density likelihood ratio, SlFor the geometric dimension likelihood ratio；In addition, the dynamic stress-strain relation of model clay and prototype soil
An important factor for similitude is dynamic model test design；Dynamic stress-dynamic strain characteristic packet of the soil body under Reversed Loading
It includes in terms of three: hysteresis quality, non-linear and Strain Accumulation, and prototype soil and model clay similar key in terms of these three
It is that dynamic shear modulus ratio is servo-actuated similar, the i.e. G/G of model clay and prototype soil of shearing strain variation relationmax- γ dynamic characteristics
Curve it is similar.
Present invention employs sawdusts, river sand, and silty clay and water are raw material, are total to by the model clay to different ratio
Shake column test, obtains the maximum dynamic shear modulus of the model clay of different ratio using the analysis fitting of origin software to test data
And dynamic shear modulus ratio-shearing strain dynamic characteristic curves；Orthogonal examination has been carried out on the basis of obtaining the relatively ratio of greater inequality example of model clay
It tests, finally obtained the proportion of dynamic test model clay of the present invention；Basic guarantee dynamic test model clay of the present invention with
The acceleration likelihood ratio of prototype soil is equal to 3, while the dynamic shear modulus ratio-of dynamic test model clay of the present invention and prototype soil is cut
Stress drive characteristic curve is substantially similar.
Compared with prior art, the invention has the advantages that.
(1) Efficiency in Buildings in Tianjin Area silty clay can be simulated.
The mass percent of the material sawdust of gained model clay of the invention, river sand and silty clay is 18%:27%:
55%, moisture content 50% substantially meets set target: superstructure, the acceleration likelihood ratio of soil and tunnel under different confining pressures
Substantially it is consistent, by Stokoe model fitting parameter and Q (γr, α) and functional value creation ternaryFunction, from
Stokoe model fitting parameter values, Q (γr, α) functional value andThree aspect comprehensive judgement of functional value obtains the present invention
The G/G of test model clay and prototype soilmax- γ dynamic characteristic curves are the most similar, can be used as simulation Efficiency in Buildings in Tianjin Area silty clay
Dynamic model test model clay.
(2) other can be carried out in relation to dynamic model by adjusting the when moisture content of matching of sawdust, river sand and silty clay
Test the simulation of soil property；Can through the invention used by method to the G/G of model clay and prototype soilmax- γ dynamic characteristic curves
Similitude determined.
The addition of three kinds of materials is to G/GmaxThe adjustable range of-γ dynamic characteristic curves is wider, to the G/G of other soil propertiesmax-
Gamma curve can also carry out the preparation of model clay by the content and moisture content for adding and adjusting sawdust, river sand.It can be by this hair
Q (the γ of bright creationr, α) and function,G/G of the function to model clay and prototype soilmaxThe phase of-γ dynamic characteristic curves
Determined like property.
(3) it is relatively reasonable to obtain convenient and cost for material.
In this match ratio in addition to silty clay, sawdust is cheap with river sand and obtains conveniently on the market, only needs to dry
And 2mm sieve is crossed, without any toxic action；Fitting method is simple, while configuring equipment and only need platform balance, the common work such as container
Tool.
Detailed description of the invention
Fig. 1 is the G/G of the prototype soil and orthogonal scheme in present invention gained embodimentmaxGamma curve；
Fig. 2 is the G/G of 30kPa confining pressure drag soil and corresponding depth prototype soil in present invention gained embodimentmax- γ is bent
Line；
Fig. 3 is the G/G of 50kPa confining pressure drag soil and corresponding depth prototype soil in present invention gained embodimentmax- γ is bent
Line；
Fig. 4 is the G/G of 70kPa confining pressure drag soil and corresponding depth prototype soil in present invention gained embodimentmax- γ is bent
Line.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment
A kind of model clay for simulating Efficiency in Buildings in Tianjin Area silty clay, it is characterised in that: to obtain meeting setting similar purpose
Model clay scheme designs and has carried out orthogonal test, and orthogonal scheme includes the component of following mass percentage content:
According to different proportions prepared 1~9 totally nine group models soil.
As dynamic test model clay of the present invention, the content of sawdust accounts for the test model clay solid gross mass
18%.
As dynamic test model clay of the present invention, the content of river sand accounts for the test model clay solid gross mass
27%.
As dynamic test model clay of the present invention, the content of silty clay accounts for the test model clay solid gross mass
55%.
As dynamic test model clay of the present invention, moisture content 50%.
Preparation method is as follows:
Firstly, weighing 2mm sieve and dry sawdust, river sand and silty clay in strict accordance with ratio；By weighed each group
Divide to be uniformly mixed and dry pack is made；Water is uniformly sprayed on uniformly mixed material using watering can, and mix is uniform；So
After be put into hermetic bag and seal for 24 hours, keep moisture more uniform.
Resonant column test is carried out to the soil sample that saturation is completed, test data analyzer is fitted using origin software, is obtained
The relevant parameter of the model clay of different ratio.Partial results are as shown in table 1.
Different ratio model clay and the density of corresponding depth prototype soil under 1 30kPa confining pressure of table, maximum dynamic shear modulus with
The acceleration likelihood ratio
The G/G of 2 different ratio model clay of table and prototype soilmax- γ dynamic characteristic curves relevant parameter
For further verify test model clay of the present invention whether meet under different confining pressures with corresponding depth prototype soil
G/GmaxThe acceleration of test model clay and prototype soil of the present invention under the similitude of-γ dynamic characteristic curves, and different confining pressure
Likelihood ratio SaWhether meet target value 3, test model clay of the present invention has been additionally carried out under 50kPa and 70kPa confining pressure
Resonant column test；It is theoretical that the confining pressure likelihood ratio is consistent with the dynamic shear modulus likelihood ratio by the likelihood ratio, it can be according to likelihood ratio theory
Select the relevant parameter of corresponding depth prototype soil.
Test result shows that dynamic test model clay of the present invention meets the similar purpose of setting: top is tied under different confining pressures
Structure, native and tunnel the acceleration likelihood ratio are consistent substantially, by Stokoe model fitting parameter and Q (γr, α) and functional value wound
Build ternaryFunction, comprehensive judgement obtains in terms of Stokoe model fitting parameter values, Q functional value and Y functional value three
The G/G of test model clay of the present invention and prototype soil outmax- γ dynamic characteristic curves are the most similar, can be used as dynamic model test
Use model clay.
The relevant parameter of test model clay and prototype soil of the present invention under the different confining pressures of table 3
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should be covered by the claims of the present invention.
Claims (12)
1. a kind of dynamic test model clay for simulating Tianjin silty clay, which comprises the steps of:
Step 1, native using Tianjin place silty clay as prototype, determine that model clay is similar to the acceleration of prototype soil when main
Similarity relation determines dynamic shear modulus ratio-shearing strain dynamic characteristic curves of Efficiency in Buildings in Tianjin Area silty clay；
Step 2, resonant column test is carried out to the model soil sample of the different ratio prepared, obtains the dynamic of different ratio model clay
Modulus of shearing-shearing strain test data；
Step 3, dynamic shear modulus-shearing strain data of the model clay of step 2 gained different densities and moisture content are carried out respectively
Analysis fitting obtains the dynamic shear modulus ratio of different ratio model clay and the relation curve of shearing strain and maximum dynamic shearing mould
Amount；
Step 4, it after obtaining the relatively ratio of greater inequality example of each material of model clay, designs orthogonal scheme and carries out resonant column test；
Step 5, Q (γ is createdr, α) function,Function, according toFunctional value decision model soil and prototype
Dynamic shear modulus ratio-shearing strain dynamic characteristic curves similitude of soil；
Step 6, according toThe acceleration likelihood ratio of functional value, model clay and prototype soil chooses dynamic model test soil
The preparation program of body.
2. according to claim 1 a kind of for simulating the dynamic test model clay of Tianjin silty clay, feature exists
In being studied according to the parameters such as shake table bearing capacity and correlation model soil, determine that the acceleration likelihood ratio is in the step 1
3, the main similarity relation that model clay and prototype soil need to meet are as follows:
Sa=SG/SρSl
In formula, SaFor the acceleration likelihood ratio of model clay and prototype soil, SGIt is similar to the dynamic shear modulus of prototype soil for model clay
Than SρFor the density likelihood ratio of model clay and prototype soil, SlFor the geometric dimension likelihood ratio of model clay and prototype soil.
3. according to claim 1 a kind of for simulating the dynamic test model clay of Tianjin silty clay, feature exists
In in the step 1, with reference to the dynamic shearing strain of Efficiency in Buildings in Tianjin Area different depth soil layer silty clay and being averaged for dynamic shear modulus ratio
Value, the dynamic shear modulus ratio-shearing strain for obtaining Efficiency in Buildings in Tianjin Area silty clay different depth soil layer using Stokoe models fitting are dynamic
Force characteristic curve.
4. according to claim 1 a kind of for simulating the dynamic test model clay of Tianjin silty clay, feature exists
In, in the step 2, weigh sawdust, river sand and silty clay according to the ratio, weighed each component is uniformly mixed be made it is dry mixed
Material is closed, hermetic bag storage is put into after adding water mix uniform for 24 hours, is uniformly distributed moisture content；The specification of sample be 39.1mm ×
80mm, according to Standard for test methods of earthworks sample preparation；The moisture content and density of soil sample are prepared by design of scheme and sample.
5. according to claim 1 a kind of for simulating the dynamic test model clay of Tianjin silty clay, feature exists
In in the step 2, when carrying out resonant column test to the model clay of different ratio, confining pressure is 30kPa, using free vibration
Method is tested, and the range of shearing strain is 10 in the test data of gained different ratio model clay-6-10-4。
6. according to claim 1 a kind of for simulating the dynamic test model clay of Tianjin silty clay, feature exists
In in the step 3, establishing Stokoe pattern function using origin software, used to the model clay data of different ratio
Stokoe models fitting obtains maximum dynamic shear modulus and dynamic shear modulus ratio-shearing strain dynamic characteristic curves；
Stokoe model:
In formula, G is dynamic shear modulus, GmaxFor maximum dynamic shear modulus, γ is dynamic shearing strain, γrFor referring shearing strain, α is song
Curvature of a curve coefficient.
7. according to claim 1 a kind of for simulating the dynamic test model clay of Tianjin silty clay, feature exists
In in the step 4, orthogonal scheme includes the component of following mass percentage content:
8. according to claim 1 a kind of for simulating the dynamic test model clay of Tianjin silty clay, feature exists
In, in the step 5, Q (γr, α) function intuitive meaning representation be model clay n data point exist with corresponding prototype soil
(shearing strain section is 10 under identical shearing strain-6-10-2) quadratic sum of distance between dynamic shear modulus ratio；Q(γr, α) and functional value
It is smaller, illustrate that program model clay and prototype soil dynamic shear modulus ratio-shearing strain dynamic characteristic curves departure degree are smaller.
9. according to claim 1 a kind of for simulating the dynamic test model clay of Tianjin silty clay, feature exists
In in the step 5, for the reference strain γ for comprehensively considering the fitting of Stokoe modelrWith coefficient of curvature α to similarity of curves
Influence, create and basisFunctional value judges that the model clay of different schemes is cut with prototype soil dynamic shear modulus ratio-
The characteristic similitude of stress drive；Q(γr, α) and function,Function is defined by following formula:
In formula,Use obtained by Stokoe models fitting that (shearing strain section is 10 for prototype soil-6-10-2) G/GmaxValue,For
Each scheme model clay uses obtained by Stokoe models fitting that (shearing strain section is 10-6-10-2) G/GmaxValue,For prototype soil
Referring shearing strain,For the referring shearing strain of model clay,For the referring shearing strain likelihood ratio, SαFor the coefficient of curvature likelihood ratio,
Q is Q (γr, α) and functional value.
10. according to claim 1 a kind of for simulating the dynamic test model clay of Tianjin silty clay, feature exists
In, in the step 6,Value and SαValue is smaller closer to 1, Q value,With Q (γr, α) and function product
Value is that Y value is smaller, illustrates dynamic shear modulus ratio-shearing strain dynamic characteristic curves departure degree of program model clay Yu prototype soil
Smaller, curve shape similarity degree is higher, and the similarity degree of curve entirety is higher, dynamic the cutting of program model clay and prototype soil
Shear modulu ratio-shearing strain curve is more similar.
11. according to claim 1 a kind of for simulating the dynamic test model clay of Tianjin silty clay, feature exists
In, in the step 6, the acceleration likelihood ratio target value of model clay and prototype soil is 3,It is worth smaller, the program
Model clay is more similar to dynamic shear modulus ratio-shearing strain curve of prototype soil, meets the model clay of the scheme of two above condition
It can be used as dynamic test model clay.
12. according to claim 1 a kind of for simulating the dynamic test model clay of Tianjin silty clay, feature exists
In, in the step 6, the mass percent of sawdust, river sand and silty clay is 18%:27%:55%, moisture content 50%,
The dynamic model test of simulation Tianjin silty clay as of the invention is matched with model clay.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109060479A (en) * | 2018-08-29 | 2018-12-21 | 长安大学 | A kind of configuration method of the dynamic model test soil body |
| CN109783924A (en) * | 2019-01-09 | 2019-05-21 | 中铁十局集团西北工程有限公司 | The Numerical Analysis methods that Groundwater iron shield tunnel construction influences |
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- 2019-06-03 CN CN201910474749.2A patent/CN110186727B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109060479A (en) * | 2018-08-29 | 2018-12-21 | 长安大学 | A kind of configuration method of the dynamic model test soil body |
| CN109783924A (en) * | 2019-01-09 | 2019-05-21 | 中铁十局集团西北工程有限公司 | The Numerical Analysis methods that Groundwater iron shield tunnel construction influences |
Non-Patent Citations (4)
| Title |
|---|
| 燕晓等: "大型振动台试验模型场地土的配制方法", 《结构工程师》 * |
| 王志佳: "岩土工程振动台试验理论及在地下管线动力响应研究中的应用", 《中国博士学位论文全文数据库》 * |
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