CN106323734A - Method for predicting liquid limit and plastic limit through suction stress feature curve - Google Patents
Method for predicting liquid limit and plastic limit through suction stress feature curve Download PDFInfo
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- CN106323734A CN106323734A CN201610635116.1A CN201610635116A CN106323734A CN 106323734 A CN106323734 A CN 106323734A CN 201610635116 A CN201610635116 A CN 201610635116A CN 106323734 A CN106323734 A CN 106323734A
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- limit
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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
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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
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0284—Bulk material, e.g. powders
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a method for predicting liquid limit and plastic limit through a suction stress feature curve. The method includes the following steps that after on-site sampling, the suction stress feature curve of a soil mass is directly tested, or by testing a soil-water feature curve, the suction stress feature curve of the soil mass is calculated; with the water content w of the soil mass being a horizontal ordinate and suction stress sigma s being a longitudinal ordinate, the suction stress feature curve is drawn, and then the changing rule of suction stress sigma s along with the water content w is obtained; through inflection point values on the drawn suction stress feature curve, the plastic limit and liquid limit of the soil mass are obtained according to definition of liquid limit and plastic limit. In consideration of mutual effect between unsaturated soil particles and an effective stress principle, the suction stress feature curve of the soil mass is obtained; then according to the obtained suction stress feature curve, the liquid limit and the plastic limit of the soil can be directly predicted, in this way, a lot of labor and time are saved, and artificial errors caused in the testing process are avoided.
Description
Technical field
The present invention relates to Geotechnical Engineering field, be specifically related to a kind of application and inhale stress characteristics curve prediction liquid, the side of plastic limit
Method.
Background technology
The liquid of soil, plastic limit are to study its physico-mechanical properties and the important indicator of engineering classification thereof.At present soil liquid, mould
Assay method mainly has: liquid, plastic limit simultaneous determination method, rolling foulage coordinate dish-style liquid limit apparatus method etc..Existing liquid-limit & plastic-limit test side
Method is also and imperfection.Rolling foulage survey plastic limit cooperation dish-style instrument survey liquid limit existence operation complexity, anthropic factor is wherein used to affect greatly, consume
The shortcomings such as duration.And when testing low-plastic soil, it is impossible to obtain accurate data, limitation is the biggest.At present
Measure liquid both at home and abroad, the method for plastic limit only rests on experimental stage, and the shortcoming of test method is that the time is long；Data process ratio
Cumbersome；And experimenter is had certain technology requirement；Result of the test varies with each individual, therefore the numerical value of its foundation all experiences
Numerical value, and inaccuracy.
Summary of the invention
For solving the problems referred to above, the invention provides a kind of application and inhale stress characteristics curve prediction liquid, the method for plastic limit, base
In unsaturated soils theory basic theories, just can directly predict the liquid of soil, plastic limit, joint by the suction stress characteristics curve of the test soil body
A large amount of manpower and time are saved.
For achieving the above object, the technical scheme that the present invention takes is:
Stress characteristics curve prediction liquid, the method for plastic limit are inhaled in a kind of application, comprise the steps:
After S1, field investigation and sampling, by the suction stress characteristics curve of directly test soil sample or by testing the Tu Shuite of soil sample
Levy curve, obtained the suction stress characteristics curve of soil sample by conversion, i.e. inhale stress σsRelation curve with water content w；
S2, using water content w as abscissa, inhale stress σsDraw as vertical coordinate and inhale stress characteristics curve, analyze σsWith w
Changing Pattern；
S3, pass through drawn suction stress characteristics curve, according to inhaling stress σsWhen changing with water content w two are obvious
Flex point determines liquid limit w of the soil bodylWith plastic limit wp。
The method have the advantages that
The suction stress characteristics curve that the present invention obtains soil sample from application geotechnique's laboratory experiment just can directly be predicted the liquid of soil, mould
Limit, makes liquid, plastic limit more objectively show, and no longer relies solely on experience method of testing and obtains, saves a large amount of people simultaneously
Power and time, and reduce the impact of anthropic factor logarithm value in test process.
Accompanying drawing explanation
Fig. 1 applies the profile that suction stress characteristics curve prediction liquid, the method for plastic limit are drawn in implementing by the present invention.
Detailed description of the invention
In order to make objects and advantages of the present invention clearer, below in conjunction with embodiment, the present invention is carried out further
Describe in detail.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not used to limit this
Bright.
Embodiments provide a kind of application and inhale stress characteristics curve prediction liquid, the method for plastic limit, including walking as follows
Rapid:
After S1, field investigation and sampling, by the suction stress characteristics curve of directly test soil sample or by testing the Tu Shuite of soil sample
Levy curve, obtained the suction stress characteristics curve of soil sample by conversion, i.e. inhale stress σsRelation curve with water content w；
S2, using water content w as abscissa, inhale stress σsDraw as vertical coordinate and inhale stress characteristics curve, obtain σsWith w
Changing Pattern；
S3 as it is shown in figure 1, according to inhale stress σsTwo obvious flex points when changing with water content w determine the liquid of the soil body
Limit wlWith plastic limit wp, inhale on stress characteristics curve corresponding to first flex point a point for plastic limit wp, second flex point b point is corresponding
Liquid limit w that water content is the soil bodyl。
Originally suction stress σ it is embodied as utilizing in the unsaturation soil bodysWith the relation of water content w, i.e. inhale stress characteristics curve and come
The prediction liquid of the unsaturation soil body, plastic limit, make more directly perceived, vivid the showing of liquid, plastic limit, very clear, and decreases people
Interference for factor.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For Yuan, under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (1)
1. apply suction stress characteristics curve prediction liquid, the method for plastic limit for one kind, it is characterised in that comprise the steps:
After S1, field investigation and sampling, bent by the suction stress characteristics curve of directly test soil sample or the native water feature by test soil sample
Line, is obtained the suction stress characteristics curve of soil sample, i.e. inhales stress σ by conversionsRelation curve with water content w；
S2, using water content w as abscissa, inhale stress σsDraw as vertical coordinate and inhale stress characteristics curve, obtain σsChange with w
Law；
S3, pass through drawn suction stress characteristics curve, according to inhaling stress σsTwo obvious flex points when changing with water content w
Determine liquid limit w of the soil bodylWith plastic limit wp。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610635116.1A CN106323734A (en) | 2016-09-07 | 2016-09-07 | Method for predicting liquid limit and plastic limit through suction stress feature curve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610635116.1A CN106323734A (en) | 2016-09-07 | 2016-09-07 | Method for predicting liquid limit and plastic limit through suction stress feature curve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106323734A true CN106323734A (en) | 2017-01-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610635116.1A Pending CN106323734A (en) | 2016-09-07 | 2016-09-07 | Method for predicting liquid limit and plastic limit through suction stress feature curve |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113138132A (en) * | 2020-01-17 | 2021-07-20 | 河海大学 | Device and method for measuring plastic limit of soil strip |
| 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 |
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| GB2443647A (en) * | 2006-11-10 | 2008-05-14 | Univ Belfast | Method and apparatus for determining the plastic limit of soil |
| CN101672761A (en) * | 2009-09-29 | 2010-03-17 | 长安大学 | Device and method for testing soil-water characteristic curve of sandy soil |
| CN202110172U (en) * | 2011-05-26 | 2012-01-11 | 王中成 | Liquidplastic combination tester based on ranging technology of high-frequency ultrasonic sensor |
| CN103105479A (en) * | 2013-01-24 | 2013-05-15 | 上海市城市建设设计研究总院 | Full-automatic collecting liquid-plastic limit combined measuring system |
| CN104914016A (en) * | 2015-05-26 | 2015-09-16 | 水利部交通运输部国家能源局南京水利科学研究院 | Measuring method of sludge flowing states |
| CN104950093A (en) * | 2014-03-28 | 2015-09-30 | 韩国地质资源研究院 | Apparatus for measuring suction stress of unsaturated soil |
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| GB2443647A (en) * | 2006-11-10 | 2008-05-14 | Univ Belfast | Method and apparatus for determining the plastic limit of soil |
| CN101672761A (en) * | 2009-09-29 | 2010-03-17 | 长安大学 | Device and method for testing soil-water characteristic curve of sandy soil |
| CN202110172U (en) * | 2011-05-26 | 2012-01-11 | 王中成 | Liquidplastic combination tester based on ranging technology of high-frequency ultrasonic sensor |
| CN103105479A (en) * | 2013-01-24 | 2013-05-15 | 上海市城市建设设计研究总院 | Full-automatic collecting liquid-plastic limit combined measuring system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113138132A (en) * | 2020-01-17 | 2021-07-20 | 河海大学 | Device and method for measuring plastic limit of soil strip |
| 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 |
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Application publication date: 20170111 |
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