CN115931639A - Soil classification method for realizing clay content evaluation - Google Patents
Soil classification method for realizing clay content evaluation Download PDFInfo
- Publication number
- CN115931639A CN115931639A CN202211590177.2A CN202211590177A CN115931639A CN 115931639 A CN115931639 A CN 115931639A CN 202211590177 A CN202211590177 A CN 202211590177A CN 115931639 A CN115931639 A CN 115931639A
- Authority
- CN
- China
- Prior art keywords
- soil
- content
- clay
- liquid limit
- line
- 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.)
- Withdrawn
Links
- 239000002689 soil Substances 0.000 title claims abstract description 81
- 239000004927 clay Substances 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000011156 evaluation Methods 0.000 title abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 32
- 239000002245 particle Substances 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000005070 sampling Methods 0.000 claims description 2
- 230000000704 physical effect Effects 0.000 abstract description 7
- 230000004069 differentiation Effects 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000002734 clay mineral Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000010200 validation analysis Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N11/10—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material
- G01N11/12—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material by measuring rising or falling speed of the body; by measuring penetration of wedged gauges
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/40—Controlling or monitoring, e.g. of flood or hurricane; Forecasting, e.g. risk assessment or mapping
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention provides a soil classification method for realizing the evaluation of the content of clay grains, which is used for soil classification in geotechnical engineering and physical property evaluation of intermediate soil. The method comprises the following steps: the soil classification map is expanded by using the flow index and the liquid limit, the soil is accurately classified by using the method, and the content of the clay particles in the intermediate soil is evaluated. Wherein, the boundary of the content of the sticky particles is obtained by the relationship among the flow index, the liquid limit and the content of the sticky particles. The soil classification method capable of realizing the clay content evaluation provided by the invention can realize the differentiation of intermediate soil and can provide an approximate range of the clay content of the soil.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering, in particular to a soil classification method for realizing clay content evaluation.
Background
Many of the earth mass on the sea floor and land of china are often subjected to static and dynamic loads such as typhoons, sea waves, earthquakes, traffic vibrations and rainfall. A large part of the soil bodies are soils with intermediate characteristics (such as clay silt, silty clay, silty sandy soil and the like) consisting of sand grains, powder grains and sticky grains, but the current classification map of the fine-grained soil in China cannot classify the intermediate soils. Moreno-Maroto and Alonso-Azc-rate provides a solution to classify intermediate soils as shown in fig. 1. The method can accurately distinguish the intermediate soil by classifying according to the soil plasticity. The classification method needs to determine the plastic limit of the soil liquid, and the error of the plastic limit determination method is large, so that the classification chart is not accurate enough. And the intermediate soil composition is complex and its physical properties are difficult to characterize. An evaluation scheme is provided by the soil composition, which is helpful for analyzing the physical properties of the soil. Therefore, a soil classification method capable of evaluating the physical properties of intermediate soil is highly desired.
Disclosure of Invention
To solve the above problem, the classification map can be expanded by using the flow index and the content of the sticky particles. The Flow Index (FI) is a physical index in a cone falling test and represents the slope of a straight line obtained by fitting under semilogarithmic coordinates of soil water content and cone falling depth. This index can be used to replace the plasticity index of the soil to avoid plastic limit measurements. At the same time, the study shows that the content of clay (A), (B) and (C)CF) Change (1) toThe change is very important to the physical properties of the soil (soil shrinkage, liquefaction capacity, porosity, seismic wave velocity and the like), which are determined by the compressibility of clay minerals and the soil structure. The clay content, an important component of the soil, according to which the soil is further classified, is a rational way to assess the trends in the physical properties of the intermediate soil.
The invention aims to provide a soil classification method capable of realizing the assessment of the content of the clay, which not only can effectively distinguish intermediate soil, but also can assess the content range of the clay.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the Moreno-Maroto and Alonso-Azc-rate soil classification diagram is shown in FIG. 1, its plasticity index using soil (I P ) And liquid limitw L ) And (6) classifying.
A soil classification method for realizing the evaluation of the content of the clay comprises the following steps:
(1) Sampling, taking representative soil samples, and measuring plasticity index of the soil samplesI P And liquid limitw L And taking the water content of 50% as a standard for distinguishing the high liquid limit soil from the low liquid limit soil. The soil type is mainly determined by line C and line M:
two diagonal lines through the origin divide the graph into three parts: above the C line are low plastic limit Clay (CL) and high plastic limit Clay (CH). The following M lines are low plastic limit silt (ML) and high plastic limit silt (MH), and soil with intermediate characteristics (CL-ML and CH-MH) is arranged between the C line and the M line, and mainly comprises the following components: silty clay, clay silt and clay sand.
(2) Fitting data obtained by using a cone falling method under a water content-cone falling depth semilogarithmic coordinate to obtain a straight line, wherein the slope of the straight line is defined as a flow index. The following relationship exists between the flow index and the plasticity index:
replacing the plasticity index in equations (1) (2) with equation (3) can yield:
the formula is the line C and the line M which take the improved flow index as an index.
(3) Meanwhile, by measuring the content of the clay, the plasticity index and the liquid limit, the relationship among the content of the clay, the plasticity index and the liquid limit is obtained:
(4) This formula is also replaced with formula (3) to obtain the following formula of flow index and viscosity content, liquid limit:
(5) For the content of the clay in the formula (7) ((CF) Taking values: 20%, 40%, 60%, 80%, the following slime content boundaries were obtained:
the value of the content of the sticky particles is changed along with the actual requirement so as to meet the more detailed division.
(6) In the liquid limit-flow index coordinate graph, the formulas (4), (5), (8), (9), (10) and (11) are plotted, and the expanded classification graph is shown in fig. 2.
The invention has the advantages that:
compared with the traditional classification standard of the fine-grained soil in China, the invention increases the function of classifying the middle soil.
The invention replaces the plasticity index with the flow index, omits the step of plastic limit determination and has more accurate classification.
The method increases the evaluation range of the content of the sticky particles, and can change the numerical value of the boundary line of the content of the sticky particles to realize more fine division. On the premise of realizing the soil classification function, the method is greatly helpful for distinguishing the physical properties of the intermediate soil.
Drawings
FIG. 1 is a raw soil classification map;
FIG. 2 is a soil classification map for achieving an assessment of cosmid content;
FIG. 3 is a refined soil classification map;
FIG. 4 is a soil classification map accuracy validation for cosmid content assessment.
The specific implementation mode is as follows:
the present invention is further illustrated by the following examples.
Example 1
This soil classification method for achieving the estimation of the content of the cosmids is described in detail below with reference to fig. 2.
For soil to be measured, a representative soil sample amount is first taken, and different water contents need to be prepared in advance.
And (3) enabling the 30-degree and 80-g cones to contact the soil surface, and recording the soil with different water contents and the falling cone depth data after the cones fall down for 5s in a free falling manner. The data were fitted in semi-logarithmic coordinates to obtain the slope of the straight line, i.e. the flow index.
And converting the relation between the formulas to obtain the formula:
、/>
、
。
drawing a relational graph according to the drawing formula: wherein the CF is 20%, 40%, 60% and 80%.
The water content at a falling cone depth of 20 mm was found as the liquid limit. And drawing the corresponding flow index-liquid limit data in figure 2 to find the corresponding soil classification. Clay is classified if it is above line C. The CL region is low liquid limit clay, and the CH region is high liquid limit clay. If it is below the M line, it is classified as silt. The ML region is low liquid limit silt, and the MH region is high liquid limit silt. Between the two lines, the CL-ML region is the low liquid limit intermediate soil and the CH-MH region is the high liquid limit intermediate soil, and an approximate assessment of the extent of soil slime content can be made. The left side of the 20% clay content line represents a clay content of less than 20%, and the right side of the 80% line represents a clay content of greater than 80%. Is positioned between 20 percent to 80 percent of four lines of the clay content, and the clay content of the four lines is the clay content between the values of two adjacent lines.
Example 2
The classification chart can be further subdivided by changing the content of the sticky particles in the formula so as to meet the actual engineering requirements. Wherein the CF is 0-100%, as shown in FIG. 3.
Example 3
To study the accuracy of the cone dropping method, cone dropping tests were performed on soils of different clay content using 30 °,80g cones. This study data was used herein to validate the accuracy of the methods mentioned herein, as shown in fig. 4. The hollow data points are points located in regions outside the middle zone, which are not considered since the object of the invention is to classify the cosmid content of the middle soil. The soil in the middle soil area has 56 soil, the classification is correct, the number of the solid data points is 40, and the classification is wrong, the number of the cross data points is 16. The accuracy of the classification is 71% as a whole, and the actual engineering requirements can be met.
Claims (4)
1. A soil classification method for realizing clay content assessment is characterized by comprising the following steps:
(1) Sampling, taking representative soil samples, and measuring the plasticity index of the soil samplesI P And liquid limitw L And obtaining a water content of 50% as a high liquid limit C line and a low liquid limit soil M line:
(2) Fitting data obtained by using a cone falling method under a water content-cone falling depth semilogarithmic coordinate to obtain a straight line, wherein the slope of the straight line is defined as a flow index, and the flow index and the plasticity index have the following relation:
the formula (3) replaces the plasticity index in the formulas (1) and (2) to obtain:
obtaining a C line and an M line with the flow index as an index;
(3) By measuring the content of the clay, the plasticity index and the liquid limit, the formula is obtained:
(4) Replacing by using a formula (3) to obtain a formula of the flow index, the content of the sticky particles and the liquid limit:
(5) The content of clay particlesCFObtaining a sticky grain content boundary line;
(6) And drawing a liquid limit-flow index coordinate graph by taking a C line and an M line which take the flow index as an index and a sticky particle content boundary line as a basis.
2. The soil classification method for realizing the estimation of the content of the clay grains in the soil as claimed in claim 1, wherein the flow index is obtained by: and (3) contacting the soil surface by using cones of 30 degrees and 80g, recording the data of the soil with different water contents and the depth of the falling cone after the free falling body falls for 5s, and fitting the data under a semilogarithmic coordinate to obtain a linear slope, namely a flow index.
3. The method for classifying soil to evaluate the content of slime according to claim 1, wherein in the step (5), the soil is classifiedCFThe value is any value between 0 and 100 percent.
4. The soil classification method for realizing the estimation of the content of the clay grains in the soil as claimed in claim 1, is characterized in that in a liquid limit-flow index coordinate graph: classifying the clay above the C line, wherein the CL area is low liquid limit clay, and the CH area is high liquid limit clay; silt is classified below the M line, ML is low liquid limit silt, MH is high liquid limit silt; between the two lines, the CL-ML region is low liquid limit medium soil and the CH-MH region is high liquid limit medium soil.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211590177.2A CN115931639A (en) | 2022-12-12 | 2022-12-12 | Soil classification method for realizing clay content evaluation |
| CN202310472932.5A CN116698670B (en) | 2022-12-12 | 2023-04-28 | Soil classification method for realizing agglomerate content evaluation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211590177.2A CN115931639A (en) | 2022-12-12 | 2022-12-12 | Soil classification method for realizing clay content evaluation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115931639A true CN115931639A (en) | 2023-04-07 |
Family
ID=86697341
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211590177.2A Withdrawn CN115931639A (en) | 2022-12-12 | 2022-12-12 | Soil classification method for realizing clay content evaluation |
| CN202310472932.5A Active CN116698670B (en) | 2022-12-12 | 2023-04-28 | Soil classification method for realizing agglomerate content evaluation |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310472932.5A Active CN116698670B (en) | 2022-12-12 | 2023-04-28 | Soil classification method for realizing agglomerate content evaluation |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN115931639A (en) |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2443647A (en) * | 2006-11-10 | 2008-05-14 | Univ Belfast | Method and apparatus for determining the plastic limit of soil |
| CN104594148B (en) * | 2014-12-01 | 2016-07-27 | 安徽建工集团有限公司 | The classification processing method of high liquid limit soil in subgrade engineering |
| CN104596891A (en) * | 2015-01-04 | 2015-05-06 | 同济大学 | Method for determining plastic index and consistency state of natural cohesive soil |
| CN106157181B (en) * | 2016-07-06 | 2019-12-24 | 山东大学 | Method for quickly grading soil surrounding rock in real time based on while-drilling parameters |
| KR20180082750A (en) * | 2017-01-11 | 2018-07-19 | 전북대학교산학협력단 | Plastic limit measuring device |
| CN109297780B (en) * | 2018-10-23 | 2021-01-01 | 东华理工大学 | Sampling method in liquid plastic limit combined determination method |
| CN109437801B (en) * | 2018-12-14 | 2020-03-06 | 山东大学 | Modifier for high liquid limit clay road |
| FR3100891B1 (en) * | 2019-09-12 | 2022-11-18 | Vinci Construction Terrassement | Soil Analysis Process |
| CN113087455B (en) * | 2021-04-07 | 2022-02-11 | 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 |
-
2022
- 2022-12-12 CN CN202211590177.2A patent/CN115931639A/en not_active Withdrawn
-
2023
- 2023-04-28 CN CN202310472932.5A patent/CN116698670B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN116698670B (en) | 2024-01-26 |
| CN116698670A (en) | 2023-09-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Dreyer et al. | Minipermeameter-based study of permeability trends in channel sand bodies | |
| Hegazy et al. | Objective site characterization using clustering of piezocone data | |
| Ishihara et al. | Case studies of liquefaction in the 1964 Niigata earthquake | |
| Yong et al. | A unified expression for grain size distribution of soils | |
| Zhou et al. | The breakthrough pressure and sealing property of Lower Paleozoic carbonate rocks in the Gucheng area of the Tarim Basin | |
| CN111122664A (en) | High-fill foundation overall quality evaluation method | |
| Sahu et al. | Empirical methods and estimation of hydraulic conductivity of fluvial aquifers | |
| Duan et al. | Characterization and classification of pore structures in deeply buried carbonate rocks based on mono-and multifractal methods | |
| Hmeid et al. | Particle size distribution and statistic analysis of the grain size messinian bentonite from the kert bassin (northern Morocco) | |
| Liao et al. | Stratigraphic delineation by three-dimensional clustering of piezocone data | |
| CN115931639A (en) | Soil classification method for realizing clay content evaluation | |
| CN113137225A (en) | Gravel reservoir evaluation method based on gravel component analysis | |
| Mali et al. | Identifying geotechnical characteristics for landslide hazard indication: a case study in Mandi, Himachal Pradesh, India | |
| Eamer et al. | Distinguishing depositional setting for sandy deposits in coastal landscapes using grain shape | |
| George et al. | Estimation of aquifer hydraulic parameters via complementing surfacial geophysical measurement by laboratory measurements on the aquifer core samples | |
| CN111366475B (en) | Method for acquiring shear strength parameters of particle-type structural surface and structural belt | |
| CN112348330A (en) | Method for determining quantitative classification of altered pyroclastic glutenite reservoir | |
| Lazzaro et al. | On evaluating the hypothesis of shape similarity between soil particle-size distribution and water retention function | |
| Xu et al. | The microstructure characteristic of cohesive soil in inner shelf of the East China Sea and its engineering implication | |
| Drohan et al. | Redefining the fragipan to improve field recognition and land use relevance | |
| Meena et al. | Approximating Soil Physical Properties Using Geo-Statistical Models in Lower Kosi Basin, of Ganga River System, India Prone to Flood Inundation | |
| Zhao et al. | Stratigraphic sequence and deposition-affected compressibility of fine-grained sediments in the ancient Yellow River Delta during the late Pleistocene and Holocene | |
| Wang et al. | Experimental Measurement of the Permeability of Calcareous Sands in the South China Sea | |
| Ecemis et al. | Effect of drainage conditions on CPT resistance of silty sand: physical model and field tests | |
| Toan | Assessment riverbank Stability of the Red Riverbank: Case study in the riverbank from km 20 to km 27, Ba Vi, Hanoi |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20230407 |