CN1719229A - Experimentation method of moisture absorption void ratio - Google Patents
Experimentation method of moisture absorption void ratio Download PDFInfo
- Publication number
- CN1719229A CN1719229A CN 200510019115 CN200510019115A CN1719229A CN 1719229 A CN1719229 A CN 1719229A CN 200510019115 CN200510019115 CN 200510019115 CN 200510019115 A CN200510019115 A CN 200510019115A CN 1719229 A CN1719229 A CN 1719229A
- Authority
- CN
- China
- Prior art keywords
- dry
- graduated cylinder
- moisture absorption
- void ratio
- soil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a kind of experimentation method of moisture absorption void ratio.This method comprises the following steps: it at first is to select air-dry soil sample, pulverizes and sieves, and oven dry, taking-up is put into dry cylinder and is cooled to room temperature; Next is to adopt balance to take by weighing soil sample; The 3rd is to inject pure water in graduated cylinder, and adds pure sodium chloride solution; The 4th is that the sample soil of getting ready is poured in the graduated cylinder, stirs, and with pure water drip washing stirrer and graduated cylinder wall, leaves standstill; The 5th is after treating the suspension clarification, to survey and read native face height.This method is simple, easy to operate, and index is more objective, and data stabilization is reliable, favorable reproducibility, is easy to apply.
Description
Technical field
The present invention relates to swelled ground and differentiate the field, more specifically relate to the test method of a kind of soil physics index-free moisture absorption void ratio, be applicable to that swelled ground is differentiated and classification.
Background technology
The breathing level evaluation of swelled ground is the top priority of carrying out the swelled ground punishment.For many years, the relevant industry of China has selected for use some indexs directly or indirectly relevant with contraction with the expansion of swelled ground that swelled ground is classified with department voluntarily, as free swelling rate, liquid limit, plasticity index, clay content, smectite content, specific surface area, cation exchange capacity (CEC) or the like cause classification results that bigger difference is also arranged.After " Technical code for buildings in swelling soil zone " promulgation, original classification of expansive soils has been simplified to only used index of free swelling rate.All the time, people constantly query to the science and the reliability of free swelling rate.The authoritative sources points out: " free swelling rate is not the index of desirable differentiation swelled ground." " the railway engineering rock-soil classification standard " of calendar year 2001, the criteria for classification of swelled ground has been carried out bigger modification, utilized the electrochemical theory of soil science, soil, reasonably selected the parameter of reflection swelled ground essence.Free swelling rate, smectite content, three indexs of cation exchange capacity (CEC) are adopted in the classification of suggestion swelled ground.
Free swelling rate means the oven-dried soil of artificial preparation, the ratio of the volume that increases in water and original volume.Because interference from human factor is more in the free swelling rate test process, the 1-2 μ m grade of Yanggao County's sample for example, 10ml volume soil property amount is about 5g; The then about 4g of high mountain range sample, this explanation differs greatly with the density of the soil sample that the standard graduated cylinder is measured; Even if for a kind of soil, the fine ground difference of different operating personnel soil also can cause the quality of 10ml soil sample to exist than big difference.So to the reliability of this index and can to what extent reflect the aspects such as essence of swelled ground, exist dispute,, can not reflect the poor reproducibility of swelled ground essence and index preferably always though its method of testing is simple.
Smectite content, cation exchange capacity (CEC) index test are then extremely inconvenient, are unfavorable for applying in engineering.
Summary of the invention
The object of the present invention is to provide a kind of experimentation method of moisture absorption void ratio, this method is easy, convenient, is easy to promote, and data stabilization is reliable, favorable reproducibility.
The technical solution adopted in the present invention is: proposed free moisture absorption void ratio definition, and corresponding test method is provided.In order to overcome the deficiency as the breathing level evaluation index of swelled ground such as free swelling rate, smectite content, cation exchange capacity (CEC), the present invention proposes a kind of judging quota-free moisture absorption void ratio of swell-shrink characteristic of swelled ground, and corresponding test method is provided.Free moisture absorption void ratio is meant loose, the dry sample with artificial preparation, the void ratio after free imbibition is stablized in pure water.Though free moisture absorption void ratio is a simple parameters, has comprised profound connotation, surface area, mineralogical composition, kation and the water of it and soil and the degree of soil interaction are all closely bound up, can reflect the essence of swelled ground.This method is taked the method for weighing with the high precision balance, has avoided the standard graduated cylinder to measure the density variation of soil sample.
Free moisture absorption void ratio is meant loose, the dry sample with artificial preparation, the void ratio after free imbibition is stablized in pure water.With equation expression be:
In the formula, e
Ef-free moisture absorption void ratio; ρ
wThe severe of-pure water; G
sThe proportion of-soil sample; V
We-soil sample the volume after stable that in pure water, expands; g
0-test soil sample weight.
Test method: 1. select representational air-dry soil sample 100g, pulverize the whole 0.4-0.6mm of the mistake sieves in back, dry to constant under 105～110 ℃ of temperature, taking-up is put into dry cylinder and is cooled to room temperature (20-25 ℃); 2. adopt precision 0.01g balance to take by weighing soil sample some (being approximately 10g); 3. in the graduated cylinder of 40-60ml, inject the 25-35ml pure water, and adding 4-6ml concentration is the pure sodium chloride solution of 4-6%; 4. the sample soil of getting ready is poured in the graduated cylinder slowly, stirred each 9-11 time up and down, reach 40-60ml, leave standstill 22-26h with pure water drip washing stirrer and graduated cylinder wall to suspension with stirrer; 5. after treating suspension clarification, survey every 1-3h and to read 1 native face height (estimate and read to 0.1ml), 2 reading differences are no more than till the 0.2ml in 6h, and this moment, reading was expands volume after stablizing of soil sample in pure water.
The present invention compared with prior art has the following advantages and effect: the free moisture absorption void ratio that is proposed is a characteristic index of swelled ground, has fully characterized the swell-shrink characteristics of swelled ground, can be used as the judging quota of the swell-shrink characteristic of swelled ground.This method is taked the method for weighing with the high precision balance, has avoided the standard graduated cylinder to measure the density variation of soil sample and causes the error of test index, and index is more objective, and data stabilization is reliable, favorable reproducibility, and method is simple, convenient, is easy to apply.
Embodiment
Free moisture absorption hole void ratio test method step is as follows:
1. it is air-dry to test soil sample;
2. select representational air-dry soil sample 100g, pulverize the whole 0.5mm of the mistake sieves in back, under 105 ℃ of temperature, dry to constant.Taking-up is put into dry cylinder and is cooled to room temperature;
3. adopt precision 0.01g balance to take by weighing soil sample 10g;
4. in the graduated cylinder of 50ml, inject the 30ml pure water, and adding 5ml concentration is 5% pure sodium chloride solution;
5. the sample of getting ready is poured in the graduated cylinder slowly, stirred each up and down 10 times, reach 50ml, leave standstill 24h with pure water drip washing stirrer and graduated cylinder wall to suspension with stirrer;
6. after treating suspension clarification, survey every 2h and to read 1 native face height (estimate and read to 0.1ml), 2 reading differences are no more than till the 0.2ml in 6h, and this moment, reading was expands volume after stablizing of soil sample in pure water.
7. parallel experiment is 3 groups.
Test index is calculated
1. by formula
Calculate every group the test free moisture absorption void ratio (in the formula, e
Ef-free moisture absorption void ratio; ρ
wThe severe of-pure water; G
sThe proportion of-soil sample is determined according to specific gravity test; V
We-soil sample the volume after stable that in pure water, expands; g
0-test soil sample weight.
2. get the free moisture absorption void ratio of the mean value of 3 groups of free moisture absorption void ratios of testing as sample.
The inventor once utilized Hefei swelled ground (sample is taken from peace highway swelled ground along the line highway section, Hefei-six) to carry out free moisture absorption void ratio test, and achievement is listed in table 1.As can be seen from Table 1, get the soil sample of different quality and test, the coefficient of variation of free moisture absorption void ratio is 0.01-0.05 only, and data stabilization is reliable, favorable reproducibility.The free moisture absorption void ratio that is divided into swelled ground is all more than 300%, and the free moisture absorption void ratio that is divided into weak swelled ground demonstrates good cluster characteristic at 250%-300%.Test shows: free moisture absorption void ratio is a characteristic index of swelled ground, can fully characterize the swell-shrink characteristics of swelled ground, can be used as the judging quota of the swell-shrink characteristic of swelled ground.
The free moisture absorption void ratio test of table 1 Hefei swelled ground outcome table
| Test number | Sampling spot | Soil property | Quality (g) | Immersion back volume (m 3) | Free moisture absorption void ratio (%) | Test number | Sampling spot | Soil property | Quality (g) | Immersion back volume (m 3) | Free moisture absorption void ratio (%) |
| 1 | K44+020 degree of depth 1.0-1.2m | Middle swelled ground | 8.5 | 13.6 | 332.00 | 5 | The right 20m of K106+370 | Middle swelled ground | 8.5 | 13.4 | 325.65 |
| 9.0 | 14.4 | 332.00 | 9.0 | 13.7 | 311.00 | ||||||
| 9.5 | 15.3 | 334.84 | 9.5 | 14.5 | 312.11 | ||||||
| 10.0 | 16.1 | 334.70 | 10.0 | 15 | 305.00 | ||||||
| 10.5 | 16.5 | 324.29 | 10.5 | 15.8 | 306.29 | ||||||
| 11.0 | 17.5 | 329.55 | |||||||||
| Mean value | 331.23 | Mean value | 312.01 | ||||||||
| Standard deviation | 3.93 | Standard deviation | 8.20 | ||||||||
| The coefficient of variation | 0.01 | The coefficient of variation | 0.03 | ||||||||
| 2 | The right 40m of K84+060,8 # are tested pits, degree of depth 5m | Middle swelled ground | 8.5 | 13.9 | 341.53 | 6 | The field of fetching earth, K140+260 left side, degree of depth 3.8-4.8m | Weak swelled ground | 8.5 | 11.4 | 262.12 |
| 9.0 | 14.7 | 341.00 | 9.0 | 11.9 | 257.00 | ||||||
| 9.5 | 15.5 | 340.53 | 9.5 | 12.6 | 258.11 | ||||||
| 10.0 | 16.5 | 345.50 | 10.0 | 13.2 | 256.40 | ||||||
| 10.5 | 17.5 | 350.00 | 10.5 | 13.6 | 249.71 | ||||||
| Mean value | 343.71 | Mean value | 256.67 | ||||||||
| Standard deviation | 4.03 | Standard deviation | 4.48 | ||||||||
| The coefficient of variation | 0.01 | The coefficient of variation | 0.02 | ||||||||
| 3 | The right 20m of K83+520, degree of depth 2m | Middle swelled ground | 8.5 | 15.1 | 379.65 | 7 | The right 50m of K84+800,3# ditch, dark 5m | Weak swelled ground | 8.5 | 12.2 | 287.53 |
| 9.0 | 15.7 | 371.00 | 9.0 | 12.8 | 284.00 | ||||||
| 9.5 | 15.6 | 343.37 | 9.5 | 13.2 | 275.16 | ||||||
| 10.0 | 16.4 | 342.80 | 10.0 | 14 | 278.00 | ||||||
| 10.5 | 17.5 | 350.00 | 10.5 | 14.7 | 278.00 | ||||||
| Mean value | 357.36 | Mean value | 280.54 | ||||||||
| Standard deviation | 16.92 | Standard deviation | 5.07 | ||||||||
| The coefficient of variation | 0.05 | The coefficient of variation | 0.02 | ||||||||
| 4 | The right 20m degree of depth of K83+520 5m | Middle swelled ground | 8.5 | 12.8 | 306.59 | ||||||
| 9.0 | 13.6 | 308.00 | |||||||||
| 9.5 | 14.1 | 300.74 | |||||||||
| 10.0 | 14.8 | 299.60 | |||||||||
| 10.5 | 15.3 | 293.43 | |||||||||
| Mean value | 301.67 | ||||||||||
| Standard deviation | 5.86 | ||||||||||
| The coefficient of variation | 0.02 | ||||||||||
Claims (1)
1, a kind of experimentation method of moisture absorption void ratio comprises the following steps:
A, select air-dry soil sample, pulverize the back and cross the 0.4-0.6mm sieve, under 105～110 ℃ of temperature, dry, take out and put into dry cylinder and be cooled to room temperature to constant;
B, employing precision 0.01g balance take by weighing soil sample;
C, in the graduated cylinder of 40-60ml, inject the 25-35ml pure water, and to add 4-6ml concentration be the pure sodium chloride solution of 4-6%;
D, the sample soil of getting ready is poured in the graduated cylinder, stirred each 9-11 time up and down, reach 40-60ml, leave standstill 22-26h with pure water drip washing stirrer and graduated cylinder wall to suspension with stirrer;
E, treat suspension clarification after, survey every 1-3h and to read native face height 1 time, 2 reading differences are no more than till the 0.2ml in 6h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100191156A CN100386618C (en) | 2005-07-19 | 2005-07-19 | Experimentation method of moisture absorption void ratio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100191156A CN100386618C (en) | 2005-07-19 | 2005-07-19 | Experimentation method of moisture absorption void ratio |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1719229A true CN1719229A (en) | 2006-01-11 |
| CN100386618C CN100386618C (en) | 2008-05-07 |
Family
ID=35931121
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100191156A Active CN100386618C (en) | 2005-07-19 | 2005-07-19 | Experimentation method of moisture absorption void ratio |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100386618C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102401778A (en) * | 2011-04-20 | 2012-04-04 | 河海大学 | Device and method for measuring swelling representation parameters of swelling soil |
| CN106769649A (en) * | 2016-12-14 | 2017-05-31 | 河南理工大学 | A kind of assay method of wet type prose style free from parallelism bulk density and void ratio |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2708306Y (en) * | 2004-06-23 | 2005-07-06 | 北京邦鑫佳业技术有限公司 | Intelligent comparator for measuring concrete test block expansion rate |
-
2005
- 2005-07-19 CN CNB2005100191156A patent/CN100386618C/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102401778A (en) * | 2011-04-20 | 2012-04-04 | 河海大学 | Device and method for measuring swelling representation parameters of swelling soil |
| CN106769649A (en) * | 2016-12-14 | 2017-05-31 | 河南理工大学 | A kind of assay method of wet type prose style free from parallelism bulk density and void ratio |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100386618C (en) | 2008-05-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Richards et al. | Physical processes determining water loss from soil | |
| Davidson et al. | Gas diffusivity and production of CO2 in deep soils of the eastern Amazon | |
| Gao et al. | Biocrusts resist runoff erosion through direct physical protection and indirect modification of soil properties | |
| Sun et al. | An analysis of soil detachment capacity under freeze-thaw conditions using the Taguchi method | |
| Lim | Experimental investigation of erosion in variably saturated clay soils | |
| Martz | The variation of soil erodibility with slope position in a cultivated Canadian prairie landscape | |
| Zhang et al. | Seasonal variation in the precipitation recharge coefficient for the Ordos Plateau, Northwest China. | |
| Fischer et al. | Carbon cycling of biological soil crusts mirrors ecological maturity along a Central European inland dune catena | |
| CN1719229A (en) | Experimentation method of moisture absorption void ratio | |
| Saputra et al. | The influence of land cover variation on soil erosion vulnerability around coal mining concession areas in South Borneo. | |
| CN115758068B (en) | Non-point source pollution emission estimation method based on migration-diffusion test fitting optimization | |
| Rabot et al. | Relevance of the organic carbon to clay ratio as a national soil health indicator | |
| De Vos et al. | Macroscopic soil physical processes considered within an agronomical and a soil biological context | |
| Brooks et al. | Changing soil hydrology due to rain forest logging: an example from Sabah Malaysia | |
| Sun et al. | Hydrological and erosive response of soil surfaces to rainfall intensity as affected by gravel fragment coverage | |
| Palermo et al. | Experimental analysis to assess the hydrological efficiency and the nutrient leaching behavior of a new green wall system | |
| Ameen | Geotechnical characteristics of Dhaka clay | |
| Trepel et al. | Quantitative simulation of biochemical processes in peatlands as a tool to define sustainable use | |
| Taheri et al. | Dissolution behavior of carbonate rocks under various physicochemical conditions: a case study; the Taleh Zang Formation, West of Iran | |
| Jadar et al. | The effect of stress-dependent SWRC on the load carrying capacity of the slope subjected to the drying-wetting path | |
| Czeller et al. | Determination of the amount of dew using weighing lysimeter data | |
| Stresser et al. | Soil Erodibility Rates through a Hydraulic Flume Erosometer: Test Assembly and Results in Sandy and Clayey Soils | |
| Eneje et al. | Saturated hydraulic conductivity, water stable aggregates and soil organic matter in a sandy-loam soil in Ikwuano LGA of Abia state. | |
| Green | Eutrophication trends inferred from hypolimnetic dissolved-oxygen dynamics within selected White River reservoirs, northern Arkansas-southern Missouri, 1974-94 | |
| Zhang et al. | Variação sazonal no coeficiente de recarga da precipitação no Planalto Ordos, Noroeste da China |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: ANHUI TRANSPORTATION CONSULTING AND DESIGN INSTITU Free format text: FORMER OWNER: GEOTECHNICAL INSTITUTE OF MECHANICS, CHINESE ACADEMY OF SCIENCES IN WUHAN Effective date: 20100329 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 430071 XIAOHONGSHAN,WUHAN CITY, HUBEI PROVINCE TO: 230031 NO.158, HEZUOHUA NORTH ROAD, HEFEI CITY, ANHUI PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20100329 Address after: 230031 No. 158 Cooperative North Road, Anhui, Hefei Patentee after: Anhui Communications Consulting & Design Institue Address before: 430071 Wuchang, Hubei, Wuhan, small Hongshan Patentee before: Wuhan Institute of rock and soil mechanics, Chinese Academy of Sciences |
|
| C56 | Change in the name or address of the patentee |
Owner name: ANHUI TRANSPORT CONSULTING + DESIGN INSTITUTE CO., Free format text: FORMER NAME: ANHUI TRANSPORTATION CONSULTING + DESIGN INSTITUTE |
|
| CP03 | Change of name, title or address |
Address after: 230088 Hefei high tech Zone, Anhui camphor Road, No. 180 Patentee after: ANHUI TRAFFIC PLANNING AND DESIGN INSTITUTE CO., LTD. Address before: 230031 No. 158 Cooperative North Road, Anhui, Hefei Patentee before: Anhui Communications Consulting & Design Institue |