CN106872297A - The circulation compression assay method of the slag soil-stone material modulus of resilience of being delayed based on moisture content - Google Patents
The circulation compression assay method of the slag soil-stone material modulus of resilience of being delayed based on moisture content Download PDFInfo
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- CN106872297A CN106872297A CN201710007489.9A CN201710007489A CN106872297A CN 106872297 A CN106872297 A CN 106872297A CN 201710007489 A CN201710007489 A CN 201710007489A CN 106872297 A CN106872297 A CN 106872297A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0076—Hardness, compressibility or resistance to crushing
- G01N2203/0085—Compressibility
Abstract
Assay method is compressed based on the delay circulation of the slag soil-stone material modulus of resilience of moisture content the invention discloses interior, is carried out simulated driving repeated action circulating compression method and is gone to determine the modulus of resilience E of slag soil-stone material of delayingo, the soil test examination box of specification will be improved for determining each circulation actual moisture content of compression specimens, influence of the different moisture content of ultimate analysis to the slag soil-stone material modulus of resilience of delaying.This invention has filled up the blank for circulating compression assay method of the slag soil-stone material modulus of resilience of being delayed based on moisture content, reliably feasible method is provided for the slag soil-stone material that considers to delay determines its modulus of resilience under water-cut variation with the method for circulation compression, and can effectively analyze influence of the water-cut variation to the slag soil-stone material modulus of resilience of delaying.The method is simple to operate, measures the value of the slag soil-stone material modulus of resilience of delaying closer to actual value, can be that scientific research institutions and detection unit provide an effective detection method.
Description
Technical field
The invention belongs to road engineering subgrade resilient modulus laboratory test detection technique field, and in particular to based on moisture content
The circulation compression assay method of the slag soil-stone material modulus of resilience of delaying, is applied to analysis moisture content to slag soil-stone material resilience of delaying
The influence of modulus, at the same determine the modulus of resilience of soil-stone material evaluate the structure design level of roadbed and construction quality and
Performance.
Background technology
With Chinese society expanding economy, the quickening of road construction paces is opened using the constructing roadbed needs of conventional method
Mountain makes a sudden snatch, and digs river and adopts sand, is filled by means of soil, and this has not only broken up environment, and original earthen materia far can not meet
The demand that road engineering increases.Due to avoiding architecture sediment from polluting environment using slag of delaying is filling roadbed, can also avoid substantial amounts of
Slag of delaying take farmland and by means of it is native filling roadbed the problems such as, so slag soil-stone material of delaying is applied to roadbed more and more widely
In filling.
In stability, durability, intensity, rigidity and performance in pavement structure, subgrade resilient modulus are played to pass
Important effect, it still reflects the important mechanics parameter of the anti-external load ability of roadbed and non-deformability.And water-cut variation
It is the major influence factors of subgrade resilient modulus, and this change has great significance in slag roadbed further investigation of delaying.Mesh
Before, cause the research of slag subgrade resilient modulus change of delaying still few for different water cut, and still no specification and document are to following
Ring compression method determines moisture content and does detailed descriptionthe to slag soil-stone material modulus of resilience influence of delaying.For existing《JTG E40-
2007 highway earthwork test rules》Middle loading plate method and intensity meter method are suitable for surveying the modulus of resilience of fine grained soil, and not fit
The modulus of resilience for surveying coarse-grained soil.Based on this, people compel highly necessary a kind of new measuring technology come determine coarse grain delay dregs stone mix
Close the modulus of resilience of material and the influence containing water route to the slag soil-stone material modulus of resilience of delaying.
The content of the invention
For defect or deficiency that above-mentioned prior art is present, the present invention is intended to provide a kind of new accurately suitable for base
The method of testing of the slag soil-stone material modulus of resilience of being delayed in moisture content.
The present invention solves its technical problem to be realized by following scheme：
The circulation compression assay method of the slag soil-stone material modulus of resilience of being delayed based on moisture content, it is comprised the steps of：
Step 1：Five pre-add moisture content are taken near slag soil-stone material optimum moisture content of delaying and does circulation compression examination respectively
Part, and circular plastic film is applied rapidly in test specimen upper surface；
Step 2：Each test specimen carrys out simulated driving repeated action circulating compression method and goes to determine returning for slag soil-stone material of delaying
Play modulus Eo；
Step 3：The soil test examination box that specification will be improved is used for determining each circulation actual moisture content of compression specimens；
Step 4：Influence of the different moisture content of ultimate analysis to the slag soil-stone material modulus of resilience of delaying.
The step 1 specifically includes following steps：
Step 1.1：With the big examination cylinder of the medium and heavy compaction test diameter 152mm of former soil test for circulation compression specimens are tried
Cylinder；
Step 1.2：Limited by circulation compression examination cylinder size, the particle diameter for being put into the soil-stone material of examination cylinder has to consider chi
Very little effect, works as D/dmaxWhen=4~6, dimensional effect could be effectively eliminated, wherein D is examination cylinder diameter, dmaxIt is maximum experiment particle diameter
Size；Therefore the slag soil-stone material that will delay does super particles treatment, and maximum experiment particle diameter is 40mm soil-stone materials after treatment
It is put into the circulation compression examination cylinder of step 1.1；
Step 1.3：Modified compaction test in former earthwork test rule tries to achieve optimum moisture content；
Step 1.4：Five pre-add moisture content are taken near optimum moisture content carries out spice and stewing material, respectively through heavy compaction
Afterwards, five circulation compression specimens are prepared；
Step 1.5：Applying film, the above-mentioned five circulation compression specimens upper surfaces for preparing are circular with diameter 152mm rapidly
Plastic sheeting is sealed.
The step 2 specifically includes following steps：
Step 2.1：Test a height of h of former test specimen of the circulation compression specimens of above-mentioned preparation；
Step 2.2：In order that laboratory test determines modulus of resilience test specimen load closer to actual road surface load, will
Circulation compression specimens are put on electronic universal tester, make pressure head with speed v=1mm/min straight down, control test specimen is by vertical
The maximum stress σ in direction is unloaded when being about 1MPa, treats that test specimen recovers deformation, surveys its resilience for Δ l；
Step 2.3：Test specimen is carried out into m circulation compression and obtains load-deformation curve, 1≤m≤100, n-th (2≤n≤
M) what is circulated obtains slope of a curve knThe ratio of stress and strain is represented, as
In formula：σ is the stress that electronic universal tester pressure head is produced, MPa；
ε is the strain for circulating compression specimens；
F is that electronic universal tester sets power, kN；
R is the radius of electronic universal tester pressure head, m；
H is high for circulation compression specimens, m；
Δ l is circulation compression specimens resilience, m；
(xn, yn) and (x'n, y'n) it is that n-th circulation is on 0.2~1.0 near linear between stress-strain diagram value
Point；
EnIt is the modulus of resilience of n-th, MPa.
Step 2.4：Proved through substantial amounts of experiment, the circulation compression of first time delays slag soil-stone material also in unstable shape
State.Therefore when the modulus of resilience of material is sought, first time circulation ought to be rejected outside, returning obtained by remaining each circulation compression
Modulus is played to add with last averaging is the modulus of resilience value of last measure
Step 2.5：By above-mentioned steps 2.3 and step 2.4, the modulus of resilience value for determining respectively is five circulation compression specimens
E1、E2、E3、E4、E5。
The circulation compression assay method of the slag soil-stone material modulus of resilience of being delayed based on moisture content, to ensure to measure big grain
Footpath is delayed the representative accuracy with test result of sample of slag soil-stone material moisture content, and should improve determine in soil test
The examination box size of moisture content sampling, the examination box material for using is aluminium, and the test specimen sampling after heavy compaction is put into examination box, and
Ensure that the quality control per sub-sampling, in more than 1000g, can increase sampling sample, baking oven is put into after weight calculation, tried by original soil work
The final circulation compression specimens that determine of protocol steps operation are tested to delay the actual moisture content of slag soil-stone material.
Compared with prior art, this method has the advantage that compared with prior art：
In compression method is circulated, the loading pressure head sensor of instrument is directly connected with computer, can be accurately obtained resilience change
Shape amount.And in the loading plate method and intensity meter method of traditional soil test, when left and right amesdial surveys resilience, manually take
Value error is larger.In addition, repeated loading is averaging the multiple of modulus of resilience one side simulating vehicle load among circulation compression method
Effect, the modulus of resilience for drawing is more nearly material actual value, on the other hand avoids in loading plate method and intensity meter method, because
Big particle diameter test specimen impacts leakiness in modified compaction test, causes multistage loadings to measure resilience amount and changes greatly, therewith
The modulus of resilience is tried to achieve also to change greatly.
It is that test specimen is tried with electronic universal through the test specimen upper surface after heavy compaction in circulation compression specimens moisture content is determined
Test machine seaming chuck contact surface to be sealed with plastic sheeting rapidly, can effectively prevent the moisture loss of soil-stone material in test specimen,
Ensure that last measure circulates compression specimens moisture content closer to actual water cut value.Meanwhile, delayed slag circulation compression specimens are taken
During soil-stone material sample, the examination box size to determining moisture content sampling in former soil test is improved, it is ensured that per sub-sampling
Quality control in more than 1000g, sampling sample can be increased, it is ensured that the representative accuracy with test result of sample.
This invention has filled up the sky for circulating compression assay method of the slag soil-stone material modulus of resilience of being delayed based on moisture content
In vain, for consider delay slag soil-stone material under water-cut variation with circulation compression method determine its modulus of resilience provide reliably
Feasible method, and can effectively analyze influence of the water-cut variation to the slag soil-stone material modulus of resilience of delaying.The method is grasped
Make simple, measure the value of the slag soil-stone material modulus of resilience of delaying closer to actual value, can be that scientific research institutions and detection unit are carried
An effective detection method is supplied.
Figure of description
Fig. 1 is the particular flow sheet of method of testing of the present invention；
Fig. 2 carries out 20 circulation compression method gained stress-strain schematic diagrames to circulation compression specimens for the present invention.
Specific embodiment
Describe embodiments of the present invention, operating process such as Fig. 1 institutes in detail below with reference to specific drawings and Examples
Show, technical problem is solved to the present invention whereby, and reach the implementation process of technique effect and can fully understand and implement according to this.This Shen
Each feature be combineding with each other under the premise of not colliding that please be in embodiment and embodiment, in protection scope of the present invention
Within.
Delay slag soil-stone material optimum moisture content determination with prepare circulation compression specimens, concretely comprise the following steps：
(1) circulation compression specimens examination cylinder, in the circulation compression measure of the slag soil-stone material modulus of resilience of being delayed based on moisture content
In method, circulation compression specimens examination cylinder is the big examination cylinder of a diameter of 152mm of the medium and heavy compaction test of former soil test.
(2) select and be put into circulation compression specimens soil-stone material maximum particle diameter, by test apparatus is limited, be put into examination cylinder
The particle diameter of soil-stone material has to consider dimensional effect.Work as D/dmaxWhen=4~6, dimensional effect, wherein D could be effectively eliminated
It is examination cylinder diameter, dmaxIt is maximum experiment grain size, therefore in this experiment from maximum experiment particle diameter for the native stone of 40mm mixes
Material.
(3) super particles treatment, original is delayed and carried out beyond the part of maximum experiment particle diameter in dregs stone mixture gradation
Equivalent substitution is matched somebody with somebody for experiment level used, it is ensured that coarse fodder content is consistent with fine material content in soil-stone material, and equivalent substitution formula is such as
Under：
In formula：P5It is coarse fodder content, %；
P5iIt is d after treatment>The a certain grades of 5mm match somebody with somebody content, %；
D is pellet diameter, mm；
P05iIt is before processing and P5iCorresponding grain size content, %；
P0It is super particles content, %.
N is d>5mm grades of material quantity (mesh)；
(4) heavy compaction tries to achieve optimum moisture content wc, in the case where experiment level used is matched somebody with somebody, according to soil in former earthwork test rule
Compaction test determines, this grade is delayed the optimum moisture content w of slag soil-stone material under matching somebody with somebodyc。
(5) circulation compression specimens are prepared, in optimum moisture content wcFive pre-add moisture content are nearby taken for w'1、w'2、w'3、w
'4、w'5Spice and stewing material are carried out, respectively by above-mentioned steps after heavy compaction, five circulation compression specimens is prepared.
(6) sealer, the five circulation compression specimens upper surfaces that will be prepared are rapidly with a diameter of 152mm circular plastic films
Seal.
The slag soil-stone material modulus of resilience E that delays is tried to achieve using circulation compression methodo, concretely comprise the following steps：
(1) after preparing five circulation compression specimens, a height of h of former test specimen is measured respectively1、h2、h3、h4、h5。
(2) in order that laboratory test determines modulus of resilience test specimen load closer to actual road surface load, by five
Circulation compression specimens put on electronic universal tester respectively, make pressure head with speed v=1mm/min straight down, control test specimen receive
The maximum stress σ of vertical direction is unloaded when being about 1MPa, treats that test specimen recovers deformation, surveys its resilience respectively Δ l1、Δl2、
Δl3、Δl4、Δl5。
(3) to each circulation compression specimens, 20 circulation compressions are carried out and obtains stress-strain curves, as shown in Figure 2.The
What n times (2≤n≤20) were circulated obtains slope of a curve knThe ratio of stress and strain is represented, as：
In formula：σ is the stress that electronic universal tester pressure head is produced, MPa；
ε is the strain for circulating compression specimens；
F is that electronic universal tester sets power, kN；
R is the radius of electronic universal tester pressure head, m；
h0For circulation compression specimens are high, m；
Δ l is circulation compression specimens resilience, m；
(xn, yn) and (x'n, y'n) it is that n-th circulation is on 0.2~1.0 near linear between stress-strain diagram value
Point；
EnIt is the modulus of resilience of n-th, MPa.
(4) proved through substantial amounts of experiment, the circulation compression of first time delays slag soil-stone material also in unstable state.Therefore
When the modulus of resilience of material is sought, first time circulation ought to be rejected outside, remaining circulates the resilience mould obtained by compression every time
Amount adds with last averaging is the modulus of resilience value of last measure
(5) to five circulation compression specimens by above-mentioned (3) and (4) step, the modulus of resilience value for determining respectively is E1、E2、
E3、E4、E5。
Circulation compression specimens determine its moisture content, concretely comprise the following steps：
(1) plastics sealer is taken off, the circulation compression specimens for taking the modulus of resilience for having determined delay slag soil-stone material for sample,
It is fitted into the examination box that size is 210mm × 125mm × 62mm, and ensures the quality control of every sub-sampling in more than 1000g, meter
Baking oven is put into after weight.
(2) the actual moisture content for measuring five circulation compression specimens by former earthwork test rule is w1、w2、w3、w4、w5。
In sum, experimenter is according to test data E1、E2、E3、E4、E5And w1、w2、w3、w4、w5, analyze moisture content change
Change the influence to the slag soil-stone material modulus of resilience of delaying.
General principle of the invention and principal character and advantages of the present invention has been shown and described above.The technology of the industry
Personnel it should be appreciated that the present invention is not limited to the above embodiments, simply explanation described in above-described embodiment and specification this
The principle of invention, under the premise without departing from the principles of the invention, various changes and modifications of the present invention are possible, and these change and change
Enter all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by appending claims and its equivalent
Define.
Claims (4)
1. based on moisture content delay the slag soil-stone material modulus of resilience circulation compress assay method, it is characterised in that it include with
Lower step：
Step 1：Five pre-add moisture content are taken near slag soil-stone material optimum moisture content of delaying do circulation compression specimens respectively, and
Circular plastic film is applied rapidly in test specimen upper surface；
Step 2：Each test specimen carrys out simulated driving repeated action circulating compression method and goes to determine the resilience mould of slag soil-stone material of delaying
Amount Eo；
Step 3：The soil test examination box that specification will be improved is used for determining each circulation actual moisture content of compression specimens；
Step 4：Influence of the different moisture content of analysis to the slag soil-stone material modulus of resilience of delaying.
2. assay method is compressed in the circulation of the slag soil-stone material modulus of resilience of delaying according to claim 1, it is characterised in that
The step 1 specifically includes following steps:
Step 1.1：It is circulation compression specimens examination cylinder with the big examination cylinder of the medium and heavy compaction test diameter 152mm of former soil test；
Step 1.2：Limited by circulation compression examination cylinder size, original slag soil-stone material of delaying is done super particle diameter and processed based on dimensional effect
Afterwards, maximum particle diameter for 40mm soil-stone material be put into circulation compression examination cylinder in；
Step 1.3：Modified compaction test in former earthwork test rule tries to achieve optimum moisture content；
Step 1.4：Five pre-add moisture content are taken near optimum moisture content carries out spice and stewing material, respectively through heavy compaction after,
It is prepared into five circulation compression specimens；
Step 1.5：Diameter 152mm circular plastic films are used rapidly in applying film, the five circulation compression specimens upper surfaces that will be prepared
Seal.
3. assay method is compressed in the circulation of the slag soil-stone material modulus of resilience of delaying according to claim 1, it is characterised in that
The step 2 specifically includes following steps:
Step 2.1：Test a height of h of former test specimen of the circulation compression specimens of above-mentioned preparation；
Step 2.2：In order that laboratory test determines modulus of resilience test specimen load closer to actual road surface load, will circulate
Compression specimens are placed on electronic universal tester, pressure head is pressed straight down, it is ensured that delay slag soil-stone material in elastic range
Deform and control test specimen to be unloaded when receiving the maximum stress σ about 1MPa of vertical direction, treat that test specimen recovers deformation, survey its resilience
It is Δ l；
Step 2.3：Test specimen is carried out into m circulation compression and obtains load-deformation curve, 1≤m≤100, n-th (2≤n≤m) is followed
Ring obtains slope of a curve knThe ratio of stress and strain is represented, asIn formula；
σ is the stress that electronic universal tester pressure head is produced, MPa；
ε is the strain for circulating compression specimens；F is that electronic universal tester sets power, kN；
R is the radius of electronic universal tester pressure head, m；H is high for circulation compression specimens, m；
Δ l is circulation compression specimens resilience, m；
(xn, yn) and (x'n, y'n) for n-th circulation be point on 0.2~1.0 near linear between stress-strain diagram value；En
It is the modulus of resilience of n-th, MPa；
Step 2.4：Proved through substantial amounts of experiment, the circulation compression of first time delays slag soil-stone material also in unstable state,
Therefore when the modulus of resilience of material is sought, first time circulation ought to be rejected outside, remaining circulates the resilience obtained by compression every time
Modulus adds with last averaging is the modulus of resilience value of last measure
Step 2.5：By above-mentioned steps 2.3 and step 2.4, the modulus of resilience value for determining respectively is E to five circulation compression specimens1、
E2、E3、E4、E5。
4. assay method is compressed in the circulation of the slag soil-stone material modulus of resilience of delaying according to claim 1, it is characterised in that
The step 3 is specially：
Delayed the representative accuracy with test result of sample of slag soil-stone material moisture content to ensure to measure big particle diameter, changed
The examination box size of moisture content sampling is entered in former soil test to determine；The examination box material for being used is aluminium, after heavy compaction
Test specimen sampling is put into examination box, and ensures that the quality control per sub-sampling is put into baking oven after more than 1000g, weight calculation, by original
Earthwork test rule step operation finally determines circulation compression specimens and delays the actual moisture content of slag soil-stone material.
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Application publication date: 20170620 |