CN107729636A - Stabilized with inorganic binder material rebounds modulus stress based on strength level relies on model and determines method - Google Patents

Stabilized with inorganic binder material rebounds modulus stress based on strength level relies on model and determines method Download PDF

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CN107729636A
CN107729636A CN201710924322.9A CN201710924322A CN107729636A CN 107729636 A CN107729636 A CN 107729636A CN 201710924322 A CN201710924322 A CN 201710924322A CN 107729636 A CN107729636 A CN 107729636A
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modulus
inorganic binder
stabilized
resilience
model
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CN107729636B (en
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王旭东
周兴业
张蕾
关伟
杨光
王筵铸
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Research Institute of Highway Ministry of Transport
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Abstract

Model, which is relied on, the present invention relates to the stabilized with inorganic binder material rebounds modulus stress based on strength level determines method, using the horizontal stabilized with inorganic binder material of varying strength, it is compressed intensity and modulus of resilience experiment, the curved intensity for drawing force modes and modulus of resilience experiment of force modes, it is respectively adopted under dihydric phenol model and power function model expression compression force modes and curved drawing force modes, the stabilized with inorganic binder material rebounds modulus stress based on strength level relies on model.The model is using strength level and stress are two-parameter, the modulus of resilience of stabilized with inorganic binder material is characterized by functional relation, so that Modulus is changed into functional form, it effectively prevent stabilized with inorganic binder material modulus in pavement structure calculating analysis and be taken as definite value, the irrational problem of caused Calculation Anaysis for Tunnel Structure.

Description

Stabilized with inorganic binder material rebounds modulus stress based on strength level relies on model Determine method
Technical field
The invention mainly relates to field of road, more particularly to pavement structure calculates stabilized with inorganic binder material in analysis Expect the value of modulus with determining problem.
Background technology
Modulus is one of key parameter in pavement structure calculating analysis, and its value directly affects force analysis knot Fruit.For perfect elastic body, modulus is the build-in attribute of material, is not changed with the change of stress or strain, generally Definite value, when carrying out pavement structure calculating analysis at present, each pavement layer modulus value is also definite value.It is however, substantial amounts of indoor and existing Field experiment shows that, due to constituent qualitative diversity and complexity, ground surface material typically exhibits anisotropism and anisotropy, The modulus of most ground surface materials can change with the change of stress or strain level, show fairly obvious stress or Dependency characteristic is strained, the modulus of ground surface material is not definite value, but a function expression relevant with stress or strain, i.e. mould The stress of amount or strain rely on model.In order to ensure the reasonability of pavement structure Calculation results, it is necessary to obtain road surface material The stress of material or strain rely on model, and carry out pavement structure accordingly and calculate analysis.
The modulus of resilience is to characterize the major parameter of stabilized with inorganic binder material structure response, can construct inorganic binder Stabilizing material modulus of resilience stress relies on the Modulus foundation that model calculates analysis as pavement structure.
The content of the invention
For above-mentioned deficiency, the present invention proposes that a kind of stabilized with inorganic binder material rebounds modulus based on strength level should Power relies on model and determines method, and the present invention is using strength level and stress are two-parameter, characterize inorganic binder by function model The modulus of resilience of stabilizing material, the more existing definite value modulus of this method more meet the actual conditions of pavement structure.
The modulus of resilience stress of stabilized with inorganic binder material based on strength level relies on model and determines method, including such as Lower step：
1) according to design document requirement or engineering practice, determine inorganic binder type, by stabilizing material type and Test specimen health age, by adjusting inorganic binder dosage and by stabilizing material gradation composition, obtain the horizontal nothing of varying strength Machine binder stabilizing material；
2) the stabilized with inorganic binder material that varying strength is horizontal in step 1) is used, is compressed force modes respectively Intensity and modulus of resilience experiment, the curved intensity for drawing force modes and modulus of resilience experiment；
3) according to force modes, it is intensity and stress level that the test data in step 2) is organized into independent variable, because becoming Measure the data format for the modulus of resilience；
4) regression analysis is carried out to the data under compression force modes in step 3) using the dihydric phenol model of formula (1), Regression analysis is carried out to the data under the curved drawing force modes in step 3) using the power function model of formula (2), can obtain with formula (1) and the stabilized with inorganic binder material rebounds modulus stress based on strength level of formula (2) expression relies on model；
E=f (σ, R)=a σ2+ b σ+cR+d formulas (1)
E=f (σ, R)=aRc·(σ+1)bFormula (2)
In formula：E --- compression or the curved drawing modulus of resilience, unit MPa；
σ --- stress level, unit MPa；
R --- compression or flexural tensile strength, unit MPa；
A, b, c, d --- regression parameter.
Inorganic binder type is cement, lime or flyash in the step 1), is rubble, gravel by stabilizing material type Stone, gravel, sand or soil, test specimen health age are usually 7d, 28d, 90d or 180d, and strength level is usually more than 5 kinds.
Inorganic binder type is usually cement, is usually rubble by stabilizing material type, and test specimen health age is usually 90d。
Compression force modes spindle refers at 3 points or 4 points to unconfined compression test, curved drawing force modes in the step 2) Beam type bending test, intensity and modulus of resilience numerical value are typical value.
The model is using strength level and stress are two-parameter, stabilized with inorganic binder material is characterized by functional relation The modulus of resilience so that Modulus is changed into functional form, effectively prevent pavement structure and calculates stabilized with inorganic binder in analysis Material modulus is taken as definite value, the irrational problem of caused Calculation Anaysis for Tunnel Structure.
Embodiment
By taking certain stabilized with inorganic binder material as an example, illustrate the stabilized with inorganic binder material rebounds mould based on strength level Amount stress relies on model and determines method, comprises the following steps that：
Step 1. requires that stabilized with inorganic binder material is defined as cement stabilized macadam CBG- according to certain Engineering Documents 25, wherein：Inorganic binder type is cement, by stabilizing material type be rubble, test specimen health age is 90d.Pass through adjustment Inorganic binder dosage and by stabilizing material gradation composition, has obtained compressing the horizontal cement of the lower 10 kinds of varying strengths of force modes Stabilization gravel CBG-25, the curved cement stabilized macadam CBG-25 for drawing the lower 5 kinds of varying strengths of force modes horizontal.
Step 2. is compressed the intensity of force modes and returned respectively using the cement stabilized macadam CBG-25 in step 1 Modulus test, the curved intensity for drawing force modes and modulus of resilience experiment are played, the results are shown in Table 1 and table 2.
Step 3. carries out regression analysis using formula (1) to the data compressed in table 1 under force modes, can obtain formula (3).
E=43.7 σ2+ 166.5 σ+29.1R+607.2 formulas (3)
Step 4. carries out regression analysis using formula (2) to the curved data drawn under force modes in table 2, can obtain formula (4).
E=7951.2 × R0.53×(σ+1)-0.36Formula (4)
Formula (3) and formula (4) are the inorganic combination based on strength level under the different force modes of cement stabilized macadam CBG-25 Expect that stabilizing material modulus of resilience stress relies on model.
Intensity and modulus of resilience result of the test under the cement stabilized macadam CBG-25 of table 1 compression force modes
The cement stabilized macadam CBG-25 of table 2 is curved to draw intensity and modulus of resilience result of the test under force modes

Claims (4)

1. the stabilized with inorganic binder material rebounds modulus stress based on strength level relies on model and determines method, including following interior Hold：
1) according to design document requirement or engineering practice, inorganic binder type is determined, by stabilizing material type and test specimen Health age, by adjusting inorganic binder dosage and by stabilizing material gradation composition, obtain the horizontal inorganic knot of varying strength Close material stabilizing material；
2) the stabilized with inorganic binder material that varying strength is horizontal in step 1) is used, is compressed the intensity of force modes respectively And modulus of resilience experiment, the curved intensity for drawing force modes and modulus of resilience experiment；
3) according to force modes, it is intensity and stress level that the test data in step 2) is organized into independent variable, and dependent variable is The data format of the modulus of resilience；
4) regression analysis is carried out to the data under compression force modes in step 3) using formula (1), using formula (2) in step 3) Curved drawing force modes under data carry out regression analysis, obtain with formula (1) and formula (2) express based on the inorganic of strength level Binder stabilizing material modulus of resilience stress relies on model；
E=f (σ, R)=a σ2+ b σ+cR+d formulas (1)
E=f (σ, R)=aRc·(σ+1)bFormula (2)
In formula：E --- compression or the curved drawing modulus of resilience, unit MPa；
σ --- stress level, unit MPa；
R --- compression or flexural tensile strength, unit MPa；
A, b, c, d --- regression parameter.
2. according to the method for claim 1, the inorganic binder type is cement, lime or flyash, is stablized material Material type is rubble, gravel, gravel, sand or soil, and test specimen health age is 7d, 28d, 90d or 180d, strength level be 5 kinds with On.
3. according to the method for claim 2, inorganic binder type is cement, is rubble by stabilizing material type, test specimen Health age is 90d.
4. according to the method for claim 1, compression force modes spindle refers to unconfined compression test, curved drawing force modes 3 points or 4 beam type bending tests, intensity and modulus of resilience numerical value are typical value.
CN201710924322.9A 2017-09-30 2017-09-30 Method for determining stress dependence model of rebound modulus of inorganic binder stable material based on strength level Active CN107729636B (en)

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CN108517735A (en) * 2018-04-12 2018-09-11 长沙理工大学 A kind of durable asphalt pavement design method and its pavement structure based on bimodular theory

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CN108517735A (en) * 2018-04-12 2018-09-11 长沙理工大学 A kind of durable asphalt pavement design method and its pavement structure based on bimodular theory
CN108517735B (en) * 2018-04-12 2020-02-07 长沙理工大学 Durability asphalt pavement design method based on double-modulus theory and pavement structure thereof

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