CN107010902A - A kind of macroporous structure soil and its method for making sample - Google Patents
A kind of macroporous structure soil and its method for making sample Download PDFInfo
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- CN107010902A CN107010902A CN201710332588.4A CN201710332588A CN107010902A CN 107010902 A CN107010902 A CN 107010902A CN 201710332588 A CN201710332588 A CN 201710332588A CN 107010902 A CN107010902 A CN 107010902A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00991—Uses not provided for elsewhere in C04B2111/00 for testing
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
Abstract
A kind of macroporous structure soil, the structured soils include following components：Earth material：40 70 parts by weight；Kaolin：10 30 parts by weight；Cement：1 10 parts by weight；Urea：10 40 parts by weight.The present invention proposes a kind of simple and feasible, effective artificial structured soil scheme, and the scene of can solving is fetched earth the problem of causing the disturbance to soil sample structure, the homogeneity of more preferable Control Assay, quickly prepares macroporous structure soil.The present invention is native to simulate natural structure by forming the macrovoid formed after chemical bond effect and the urea granules aquation for adding different quality percentage in addition high-early (strength) cement during raw material is native.
Description
Technical field
The present invention relates to research method in geotechnical engineering, and in particular to the natural undisturbed soil of one kind simulation is bonded and macrovoid characteristic
Artificial structure's property soil and its method for making sample, belong to field of civil engineering.
Background technology
Clay under native state all has the basic stabilization of certain structural, native structural influence building
Property, structured soils are after being damaged, in brittle break, and ground is destroyed under no omen, due to the mistake for fetching earth, transporting
Journey, very big disturbance is generated to the soil body, so as to influence further investigation of the people to natural soil structure, therefore is found a kind of effective
Artificial structured soil method it is particularly important.
Some scholars attempt manually prepare with natural earth character identical sample, analyzed and researched.There is researcher to lead to
Cross and cement preparation structure sand is put into sand.Also researcher passes through silt and Ca (OH)2Mixing hits real into sample, then leads to
Carbon dioxide, so as to simulate CaCO between soil particle3Cementation.These methods can not all consider structured soils very well
Macroporous characteristic.Also there is compound preparation structure of the researcher using clay, kaolin, cement and the salt grain necessarily matched
Property soil, but due in salt grain water solubility it is smaller, curing time is longer in water, and the solubility of urea is at a temperature of 30 degree
The three-to-four-fold of salt grain solubility, and the rise of urea solubility with temperature and raise, therefore can be shortened with urea under the same terms
Curing time, improves sample preparation efficiency.If preparing macroporous structure soil, need to add substantial amounts of salt grain or urea, by
Small in salt grain solubility, the water in sample molten can not use up all salt grains within a certain period of time, can cause obtained structural soil sample
Homogeneity is bad, it is impossible to obtain macroporous structural soil sample.
The content of the invention
For problems of the prior art, the present invention proposes a kind of simple and feasible, effective artificial preparation structure
The scheme of soil, the scene of can solving is fetched earth the problem of causing the disturbance to soil sample structure, the homogeneity of more preferable Control Assay, fast
Fast prepares macroporous structure soil.
The present invention in raw material soil by adding high-early (strength) cement formation chemical bond effect and adding different quality percentage
The macrovoid formed after the urea granules aquation of ratio is native to simulate natural structure.
According to the first embodiment of the present invention, a kind of macroporous structure soil is proposed.
A kind of macroporous structure soil, the structured soils include following components：
Earth material：40-70 parts by weight, preferably 45-65 parts by weight, more preferably 50-60 parts by weight, such as 55 parts by weight；
Kaolin：10-30 parts by weight, preferably 12-28 parts by weight, more preferably 15-25 parts by weight, such as 20 weight
Part；
Cement：1-10 parts by weight, preferably 3-7 parts by weight, more preferably 4-6 parts by weight, such as 5 parts by weight；
Urea：10-40 parts by weight, preferably 15-35 parts by weight, more preferably 20-30 parts by weight, such as 20 parts by weight.
In the present invention, the earth material is silt from the bottom of lake matter soil.
In the present invention, the cement is high-early (strength) cement, preferably 425R cement.
In the present invention, the particle diameter of the earth material is 0.1-1mm, more preferably preferably 0.2-0.8mm, 0.3-0.5mm.
In the present invention, the kaolinic particle diameter is 0.1-1mm, more preferably preferably 0.2-0.8mm, 0.3-
0.5mm。
In the present invention, the particle diameter of the cement is 0.1-1mm, more preferably preferably 0.2-0.8mm, 0.3-0.5mm.
In the present invention, the particle diameter of the urea is 0.5-5mm, more preferably preferably 1-3mm, 1.2-2mm.
According to second of embodiment that the present invention is provided, there is provided a kind of method for making sample of macroporous structure soil.
A kind of method for making sample of macroporous structure soil, this method comprises the following steps：
1) component is detected：Detect proportion, plastic limit moisture content and the liquid limit moisture content, kaolinic proportion, cement of earth material
Proportion；
2) mix：Situation about being detected according to component, earth material, kaolin, cement and urea are mixed, stirs, obtains
Obtain compound；
3) sample preparation：Compound is poured into sample preparation device, reality is hit, sample is obtained；
4) conserve：Sample is put into container, vacuumized, water filling maintenance, then sample is put into maintenance under thermostat water bath；
5) sample is taken out, structured soils sample is obtained.
In the present invention, step 2) in the ratio of each component is：
Earth material：40-70 parts by weight, preferably 45-65 parts by weight, more preferably 50-60 parts by weight, such as 55 parts by weight；
Kaolin：10-30 parts by weight, preferably 12-28 parts by weight, more preferably 15-25 parts by weight, such as 20 weight
Part；
Cement：1-10 parts by weight, preferably 3-7 parts by weight, more preferably 4-6 parts by weight, such as 5 parts by weight；
Urea：10-40 parts by weight, preferably 15-35 parts by weight, more preferably 20-30 parts by weight, such as 20 parts by weight.
In the present invention, step 1) in from earth material proportion be 2-3, more preferably preferably 2.4-2.9,2.6-2.8.
The plastic limit moisture content of soil sample is 20-30%, more preferably preferably 22-28%, 24-26%.The liquid limit moisture content of soil sample is 38-
50%, preferably 40-48%, more preferably 42-46%.
It is 2-3, more preferably preferably 2.4-2.9,2.5-2.7 from kaolinic proportion.
The proportion of cement is 2.5-3.5, more preferably preferably 2.8-2.4,3-3.2.
In the present invention, step 2) in from urea proportion be 1.0-2.0, more preferably preferably 1.1-1.8,1.2-
1.5。
In the present invention, step 3) concrete operations be：Divide 3-6 layers (being preferably 4-5 layers) that compound is poured into sample preparation device
In, real and shaving is hit in layering, and the dry density of Control Assay is 1.0-2.0g/cm3, preferably 1.1-1.8g/cm3, more preferably
1.2-1.5g/cm3。
In the present invention, step 4) concrete operations be：Sample is put into container, it (is preferably 1.5- to vacuumize 1-6h
5h, more preferably 2-4h), water filling maintenance 8-72h (being preferably 12-48h, more preferably 24-36h), then sample is put into constant temperature
Water-bath under 20-50 DEG C (be preferably 25-40 DEG C, more preferably 30-35 DEG C) maintenance 2-10 days (preferably 3-8 days, more preferably
For 4-6 days).
In the present invention, step 5) in the obtained void ratio of structured soils sample be 1.0-2.0, preferably 1.1-1.8,
More preferably 1.2-1.6.
In the present invention, urea is added in the structured soils of preparation, due to the dissolution velocity and solubility advantage of urea,
Urea granules all dissolvings can be ensured in short time, the hole of the hole simulation natural structure soil formed after dissolving passes through
The urea of addition different quality containing carrys out the void ratio size of control structure soil.The structured soils that the present invention makes can be more preferable
Control Assay homogeneity, the different original state structure of natural void ratio can be simulated by adding the urea of different quality containing
Property soil.The advantages of artificial structured soil can effectively avoid the disturbance that field sampling is produced, is more preferable research structure
Soil mechanical properties provide facility.
In the present invention, void ratiovvFor pore volume；vsFor step 2) in compound volume.WhereinρwFor the density of water, i.e. 1g/cm3；γsiThe proportion of compound i compositions；msiThe quality of compound i compositions, vs
=vs1+vs2+......；That is vsFor the summation of each component volume in compound.V=vs+vv；V is cumulative volume, that is, is made
Sample body is accumulated；vv=v-vs。
After aquation, after the urea dissolving of different quality percentage, mixture volume reduces, pore volume increase.
The different macrovoid ratio structured soils of void ratio can then be formed.
Compared with prior art, the present invention has following advantageous effects：
1st, the scheme of simple and feasible, the effective artificial structured soil of the present invention, the scene that can solve, which is fetched earth, causes pair
The problem of disturbance of soil sample structure；
2nd, urea is added in structural soil sample of the invention, the solubility of urea is high, can be obtained with the homogeneity of Control Assay
To macroporous structure soil；
3rd, urea is added in structural soil sample of the invention, the dissolution velocity of urea is fast, can be quickly obtained sample, carry
High workload efficiency；
4th, layering prepares sample in method of the invention, and after vacuum maintenance, then by thermostatic curing, what can be prepared obtains
Required sample, closer to actual soil sample.
Brief description of the drawings
Fig. 1 is the cone penetration and moisture content graph of a relation of structured soils sample of the present invention；
Fig. 2 is different aperture of the present invention than curves of stress-strain relationship figure that structured soils sample CU is tested；
Fig. 3 is different aperture of the present invention than p-q graph of relation that structured soils sample CU is tested；
The curves of stress-strain relationship figure for the different loading speeds of structured soils that Fig. 4 is the void ratio e=1.7 of comparative example 3；
Fig. 5 is the p-q graph of relation of comparative example 1,2 and 3 different apertures than structured soils；
Fig. 6 is microcosmic SEM figure of the structured soils made from the embodiment of the present invention 3 under 50 multiplying powers；
Fig. 7 is microcosmic SEM figure of the structured soils made from the embodiment of the present invention 3 under 1500 multiplying powers；
Fig. 8 is that structured soils made from the embodiment of the present invention 3 are schemed by the microcosmic SEM after triaxial compression test.
Embodiment
A kind of macroporous structure soil, the structured soils include following components：
Earth material：40-70 parts by weight, preferably 45-65 parts by weight, more preferably 50-60 parts by weight, such as 55 parts by weight；
Kaolin：10-30 parts by weight, preferably 12-28 parts by weight, more preferably 15-25 parts by weight, such as 20 weight
Part；
Cement：1-10 parts by weight, preferably 3-7 parts by weight, more preferably 4-6 parts by weight, such as 5 parts by weight；
Urea：10-40 parts by weight, preferably 15-35 parts by weight, more preferably 20-30 parts by weight, such as 20 parts by weight.
In the present invention, the earth material is silt from the bottom of lake matter soil.
In the present invention, the cement is high-early (strength) cement, preferably 425R cement.
In the present invention, the particle diameter of the earth material is 0.1-1mm, more preferably preferably 0.2-0.8mm, 0.3-0.5mm.
In the present invention, the kaolinic particle diameter is 0.1-1mm, more preferably preferably 0.2-0.8mm, 0.3-
0.5mm。
In the present invention, the particle diameter of the cement is 0.1-1mm, more preferably preferably 0.2-0.8mm, 0.3-0.5mm.
In the present invention, the particle diameter of the urea is 0.5-5mm, more preferably preferably 1-3mm, 1.2-2mm.
A kind of method for making sample of macroporous structure soil, step is as follows：
(1) muck soil is air-dried, pulverized 0.5mm sieve it is standby.Foundation《Highway earthwork test rule》(JTG E-
Specific gravity test 40-2007) is carried out to raw material earth material, cement, kaolin, limit moisture content experiment is carried out to raw material soil, according to examination
Test result and judge earth material species.
A, raw material earth material specific gravity test
Table 1 tests raw materials used native specific gravity test data
Experiment earth material crosses 0.5 mm sieve, and four parallel tests are carried out to earth material with specific gravity bottle, are averaged as earth material ratio
Weight.Test data as shown in table 1, calculates and determines that earth material proportion is 2.715.
B, kaolin specific gravity test
Table 2 tests kaolin specific gravity test data used
Experiment kaolin crosses 0.5 mm sieve, and four parallel tests are carried out to earth material with specific gravity bottle, are averaged as kaolinite
Native proportion.Test data as shown in table 2, calculates and determines that kaolin proportion is 2.622.
C, cement specific gravity test
Table 3 tests cement specific gravity test data used
Test water mud is early strong 425R portland cements, and four parallel tests are carried out to cement with specific gravity bottle, are averaged
Value is used as cement proportion.Test data as shown in table 3, calculates and determines that cement proportion is 3.13.
D, the experiment of earth material limit moisture content
Take moisture content after air-drying to be tested for 3% raw material earth material, air-dried soil sample was ground into the lower earth material point of 0.5mm sieves
Open and be attached to three and contain in native wares, plus varying number distilled water, earth material moisture content is controlled in liquid limit, plastic limit and the two middle shape respectively
State.With adjusting native knife to mix well, wet cloth is covered, 18h is placed, earth material limit moisture content is then determined using liquid plastic combine tester,
Each moisture content surveys three groups of embedded depths, averages.Earth material limit moisture content experimental data is as shown in table 4.Circular cone is sunk
Depth h and moisture content w is plotted under log-log coordinate, as shown in Figure 1.
The raw material pedosphere of table 4 limits water ratio test data
This experiment uses 76g coneheads, and the corresponding moisture content of submergence depth 17mm is liquid limit, and submergence depth is 2mm correspondences
Moisture content be plastic limit.It can be looked into from Fig. 1, liquid limit moisture content is 43%；Plastic limit moisture content is 25%.Plasticity index Ip=
43-25=18>10；Therefore the fine grained soil is low liquid limit clay.
(2) according to the proportion of raw material soil, kaolin, cement and urea, for the macrovoid with certain cementing strength is made
The structured soils of ratio determine the proportioning combination of compound
(3) it is controlled according to certain initial dry density, divides 4 layers of sample preparation that compound is poured into φ 39.1mm × 80mm
Carry out hitting reality in device, obtain sample.
(4) sample is put into saturation bucket and vacuumizes 2 hours, after water filling is conserved one day, sample is put into thermostatted water
Bath keeps water to be conserved 3 days in flow regime under 30 degrees Celsius.
(5) sample after conserving 3 days is taken out, takes off three petals, obtain structured soils sample.
According to the method described above, tested respectively according to following proportioning：
Three axle not draining compression tests are carried out such as to structural soil sample prepared by above-described embodiment 1, embodiment 3, embodiment 5
Shown in Fig. 2 and Fig. 3.Certification structure soil preparation method is feasible in terms of macroscopical experiment.
Fig. 2 is three axle not drainings compression examination under void ratio e=1.3 confined pressures different with e=1.5 artificial structured soil
The curves of stress-strain relationship figure tested；Fig. 3 is void ratio e=1.3 and e=1.5 the axle not draining of artificial structured soil three
The p-q graph of relation of compression test.It can be seen that structured soils were being loaded from Fig. 2 and the axle not draining compression tests of Fig. 3 tri-
Strain softening phenomenon occurs in journey, stress dropping is in relatively slow, illustrate that cementing crush of structured soils is a process；It is logical
Overstress-strain curve void ratio 1.3 is higher than the peak strength of void ratio 1.5；Residual strength is relevant with confined pressure level,
The smaller residual strength of void ratio is higher under low confined pressure 50kPa, and structured soil residual strength is with hole under confined pressure 100kPa and 200kPa
Gap is more unrelated than size, is primarily due to small confined pressure 50kPa down cuts, and the structured soil of low void ratio 1.3 is cementing complete without destruction, makes
Higher than the structured soils of void ratio 1.5 into residual strength, cementing destruction is complete under confined pressure 100kPa, 200kPa, so residual
Residual strength is the same.
The structure soil sample destroyed after structural soil sample and experiment to embodiment 3 shoots electron-microscope scanning, such as Fig. 6, Fig. 7, Fig. 8
It is shown.
From Fig. 6, Fig. 7 can be seen that soil particle between it is cementing be distributed with macrovoid, demonstrate structured soils from microcosmic
Preparation method is feasible.The overall alignment of structured soils particle is can be clearly seen that under low range 50, it can be seen that soil
Sample is in honeycomb arrangement, can see that there is the hole left after the removing urea granules of many on soil sample surface on the diagram；In high magnification
The cementation between structure sample particle is observed that under 1500 multiplying powers, little particle is sticked in greatly by the cementation of cement
On particle.Contrasted under big multiplying power before and after the destruction of structure soil sample it can be found that soil sample particle is micelle shape bulky grain before destruction, greatly
Sample Particle Breakage is many little particles after hole, destruction, and porosity reduces, intergrain bond destruction.
Comparative example 1
The structural soil sample for adding salt grain is prepared according to the method described above, simply in step (4)：Sample is put into saturation bucket and taken out
2 hours of vacuum, after water filling maintenance two everyday, sample is put into thermostat water bath water is kept under 30 degrees Celsius in flowing shape
State is conserved 5 days.
The structural soil sample for adding salt grain is prepared according to the method described above, and because the proportion of salt grain is 2.15, the proportion of urea is
1.335, in order to preferably contrast, the initial void ratio of compound of comparative example is controlled in step (2) as test example,
Proportioning is as follows：
Three axle not draining compression tests are carried out to structural soil sample prepared by above-mentioned comparative example 1, comparative example 2, comparative example 3,
As a result as shown in Figure 4 and Figure 5.
Fig. 5 for addition salt grain different aperture than structured soils strength envelope, Fig. 4 void ratios e=1.7 is in different loading speed
Load-deformation curve under rate.
Void ratio 1.3, the artificial structured soil comparative example strain softening of void ratio 1.5 be not obvious as can be seen from Figure 5,
There is slight cut to rise, Structural Characteristics are not obvious.It is bent from the different loading speed stress-strains of Fig. 4 void ratios e=1.7 comparative example
Line can be seen that structured soils strain softening is not obvious, and stress dropping is smaller, because void ratio is the same, the knot of different loading speeds
Residual strength should be much the same after structure soil destruction, but loading speed 1mm/min structured soils residual strength is too high, and having can
Salt grain can fully it not dissolved in maintenance processes, homogeneity is bad.
In addition, to prepare the structured soils of same void ratio, it is necessary to which the salt used is more more than urea, due to salt at normal temperatures
Solubility is low, and substantial amounts of salt grain is difficult to have been dissolved in the short time, and curing time is longer.
Claims (10)
1. a kind of macroporous structure soil, the structured soils include following components：
Earth material：40-70 parts by weight, preferably 45-65 parts by weight, more preferably 50-60 parts by weight；
Kaolin：10-30 parts by weight, preferably 12-28 parts by weight, more preferably 15-25 parts by weight；
Cement：1-10 parts by weight, preferably 3-7 parts by weight, more preferably 4-6 parts by weight；
Urea：10-40 parts by weight, preferably 15-35 parts by weight, more preferably 20-30 parts by weight.
2. structured soils according to claim 1, it is characterised in that：The earth material is silt from the bottom of lake matter soil；And/or
The cement is high-early (strength) cement, preferably 425R cement.
3. structured soils according to claim 1 or 2, it is characterised in that：The particle diameter of the earth material is 0.1-1mm, preferably
For 0.2-0.8mm, more preferably 0.3-0.5mm；
The kaolinic particle diameter is 0.1-1mm, more preferably preferably 0.2-0.8mm, 0.3-0.5mm；
The particle diameter of the cement is 0.1-1mm, more preferably preferably 0.2-0.8mm, 0.3-0.5mm；
The particle diameter of the urea is 0.5-5mm, more preferably preferably 1-3mm, 1.2-2mm.
4. a kind of method for making sample of macroporous structure soil prepares macroporous structure soil any one of claim 1-3
Method, this method comprises the following steps：
1) component is detected：Detect proportion, plastic limit moisture content and liquid limit moisture content, kaolinic proportion, the proportion of cement of earth material；
2) mix：Situation about being detected according to component, earth material, kaolin, cement and urea are mixed, stirs, is mixed
Close material；
3) sample preparation：Compound is poured into sample preparation device, reality is hit, sample is obtained；
4) conserve：Sample is put into container, vacuumized, water filling maintenance, then sample is put into maintenance under thermostat water bath；
5) sample is taken out, structured soils sample is obtained.
5. method according to claim 4, it is characterised in that：Step 2) in the ratio of each component is：
Earth material：40-70 parts by weight, preferably 45-65 parts by weight, more preferably 50-60 parts by weight；
Kaolin：10-30 parts by weight, preferably 12-28 parts by weight, more preferably 15-25 parts by weight；
Cement：1-10 parts by weight, preferably 3-7 parts by weight, more preferably 4-6 parts by weight；
Urea：10-40 parts by weight, preferably 15-35 parts by weight, more preferably 20-30 parts by weight.
6. the method according to claim 4 or 5, it is characterised in that：Step 1) in from earth material proportion be 2-3, preferably
For 2.4-2.9, more preferably 2.6-2.8；The plastic limit moisture content of soil sample is 20-30%, more preferably preferably 22-28%, 24-
26%；The liquid limit moisture content of soil sample is 38-50%, more preferably preferably 40-48%, 42-46%；
It is 2-3, more preferably preferably 2.4-2.9,2.5-2.7 from kaolinic proportion；
The proportion of cement is 2.5-3.5, more preferably preferably 2.8-2.4,3-3.2.
7. the method according to any one of claim 4-6, it is characterised in that：Step 2) in be from the proportion of urea
1.0-2.0, preferably 1.1-1.8, more preferably 1.2-1.5.
8. the method according to any one of claim 4-7, it is characterised in that：Step 3) concrete operations be：Divide 3-6 layers
(being preferably 4-5 layers) pours into compound in sample preparation device, and real and shaving is hit in layering, and the dry density of Control Assay is 1.0-2.0g/
cm3, preferably 1.1-1.8g/cm3, more preferably 1.2-1.5g/cm3。
9. the method according to any one of claim 4-8, it is characterised in that：Step 4) concrete operations be：By sample
It is put into container, vacuumizes 1-6h (be preferably 1.5-5h, more preferably 2-4h), water filling maintenance 8-72h (it is preferably 12-48h,
More preferably 24-36h), then it (is preferably 25-40 DEG C, more preferably 30-35 that sample is put into thermostat water bath at 20-50 DEG C
DEG C) under maintenance 2-10 days (preferably 3-8 days, more preferably 4-6 days).
10. the method according to any one of claim 4-9, it is characterised in that：Step 5) in obtain structured soils examination
The void ratio of sample is 1.0-2.0, more preferably preferably 1.1-1.8,1.2-1.6.
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| CN109724855A (en) * | 2018-12-13 | 2019-05-07 | 上海大学 | The method that imitated soil sample is repeated by heating volatilization organic material skeleton using 3D printing technique |
| CN109991392A (en) * | 2019-04-11 | 2019-07-09 | 中原工学院 | A kind of three valve wares and test method for soil test combined measurement method of liquid and plastic limits |
| CN111125917A (en) * | 2019-12-26 | 2020-05-08 | 湘潭大学 | Construction method of single-particle discrete element model containing inner pores |
| CN113087455A (en) * | 2021-04-07 | 2021-07-09 | 湘潭大学 | High liquid limit large pore structural soil and sample preparation method thereof |
| CN113567303A (en) * | 2021-07-20 | 2021-10-29 | 深圳市市政工程总公司 | Method for measuring liquid limit, plastic limit and plasticity index of dredged sludge |
| CN114839012A (en) * | 2022-04-15 | 2022-08-02 | 西安理工大学 | Method for artificially preparing structural soil |
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| CN101353738A (en) * | 2008-09-26 | 2009-01-28 | 重庆大学 | Preparation of porosity controllable porous titanium |
| CN103936348A (en) * | 2014-03-22 | 2014-07-23 | 四川大学 | Preparation method of structural soil for initial stress anisotropy researches |
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