CN108593486A - The device and method of gravel clay soil―structure interaction is mixed in a kind of filter paper method measurement - Google Patents
The device and method of gravel clay soil―structure interaction is mixed in a kind of filter paper method measurement Download PDFInfo
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- CN108593486A CN108593486A CN201810418360.1A CN201810418360A CN108593486A CN 108593486 A CN108593486 A CN 108593486A CN 201810418360 A CN201810418360 A CN 201810418360A CN 108593486 A CN108593486 A CN 108593486A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/02—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content
- G01N5/025—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content for determining moisture content
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
- G01N33/246—Earth materials for water content
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Abstract
The invention discloses the devices that gravel clay soil-water characteristic curve is mixed in a kind of filter paper method measurement, include the test specimen tube being made of two split cavities（1）, the split cavity is separately fixed at pedestal（2）On, two pedestals（2）Relative edge and the split cavity flush with its homonymy, partition board（3）Or quantitative analysis filter paper（7）It is movably set between two split cavities, by connector between two split cavities（6）It is connected, the test specimen tube（1）Top is detachable to be connected with top plate（4）.The invention also discloses a kind of methods that gravel clay soil-water characteristic curve is mixed in filter paper method measurement.The present invention can measure the soil-water characteristic curve of the soil body containing greater particle size particle, and cost is relatively low, it is easy to operate, while the method tested parallel can also be carried out at the same time by using several covering devices and measure the time to shorten, it quickly obtains mixing gravel clay soil-water characteristic curve.
Description
Technical field
The present invention relates to the device and methods that gravel clay soil―structure interaction is mixed in a kind of filter paper method measurement, belong to ground work
Journey technical field.
Background technology
In earth rockfill dam with central core engineering, mixes gravel clay and be widely used in seepage prevention of core wall body.Construct filling craft it is entire
Core-wall and the core-wall of runtime saturation above section accurately obtain soil-water feature of core-wall material all in unsaturated state
Curve is of great significance for calculating core-wall permeability and stress distribution.
Filter paper method be it is a kind of by measure soil in suction by obtain the effective means of soil body soil―structure interaction, in soil
Earth field grows up and is used widely.It is placed on soil sample surface using filter paper as sensing body, moisture will be from soil mud to filter
Paper, until the two suction equalization.The moisture content for measuring filter paper can by filter paper suction and the moisture content relation curve of prior calibration
Push away to obtain soil suction.Then the soil moisture content by measuring, you can obtain its soil―structure interaction.
The existing method for measuring soil―structure interaction, including filter paper method, primarily directed to fine grained soil or sand
, and the grain diameter for mixing gravel clay cobble-stone is often larger, so existing soil―structure interaction measurement method can not be straight
It connects and applies to mix gravel clay.
Invention content
The technical problem to be solved by the invention is to provide a kind of are directed to mix the problem that grain diameter is larger in gravel clay,
The soil―structure interaction containing the greater particle size particle soil body can be measured, and cost is relatively low, filter paper method easy to operate measures
Mix the device of gravel clay soil―structure interaction.
The present invention also provides a kind of methods that gravel clay soil―structure interaction is mixed in filter paper method measurement, and the method is easy to operate, together
When can also be carried out at the same time parallel experiment by using several covering devices, so as to shorten measure the time, quickly obtain mixing gravel clay
Soil―structure interaction.
In order to solve the above technical problems, the technical solution adopted by the present invention is：
The device of gravel clay soil―structure interaction is mixed in a kind of filter paper method measurement, includes the sample being made of two split cavities
Cylinder, the split cavity are separately fixed on pedestal, the relative edge of two pedestals and the split cavity flush with its homonymy,
Partition board or quantitative analysis filter paper are movably set between two split cavities, are connected by connector between two split cavities, institute
State that test specimen tube top is detachable to be connected with top plate.
The connector includes bolt or pin.
It is closely connected by connecting rod between the top plate and pedestal.
The both sides of the opposite face of two split cavities are both provided with the engaging lug of protrusion, and the engaging lug is corresponding with partition board
Position is both provided with for the through-hole across the connector.
Be equipped on the pedestal and top plate several permeable holes, the pedestal and top plate the test specimen tube peripheral part
Relative position be provided with it is several for across the connecting rod connecting holes.
A diameter of 2~3mm of the permeable hole；The grain diameter for mixing gravel clay cobble-stone is no more than the split cavity
The 1/5 of internal diameter.
The pedestal includes rectangular.
The quantitative analysis filter paper is the II type filter paper of quantitative analysis of free from dust.
A kind of method that gravel clay soil―structure interaction is mixed in filter paper method measurement, includes the following steps：
S01 is used in combination connector to connect between partition board is placed on two split cavities of test specimen tube；
S02 calculates the quality for mixing gravel clay according to preset sample dry density, and take above-mentioned calculation amount mixes gravel clay, root
It according to the water distribution of sample moisture content and mixes thoroughly, then bored sample at least 12 hours is divided into 6 parts；
S03 spreads one layer of ordinary filter paper in the bottom of test specimen tube, two for mixing gravel clay and being packed into test specimen tube that S02 is got ready
In split cavity, divides 3 layers and hit reality, obtain two semicolumn soil samples；
S04 spreads one layer of ordinary filter paper at the top of the sample made, then covers top plate on sample and with connecting rod and bottom
The close connection of seat；
Whole device is put into vacuum saturation cylinder together with sample and carries out pumping saturation, and impregnates at least 12 in clear water by S05
Hour, top plate and partition board are removed later, allow its natural air drying；
S06, not timing weigh device together with sample, when sample mass drops to the estimation matter under required saturation degree
When amount, quantitative analysis filter paper is placed between two semicolumn samples, two split cavities are closely connected with connector, and be sealed in
In polybag, it is then placed in moisturizing cylinder, is placed at least 7 days, is allowed between sample and quantitative analysis filter paper and reach suction equalization；
Estimation quality under required saturation degree is calculated by formula (1)：
In formula：ρdDry density, unit g/cm are preset for sample3；V is volume of sample, can be calculated by split cavity size
It arrives, unit cm3；GsBe definite value to mix gravel clay particle mean specific gravity, dimensionless, can approximation take 2.6；SrIt is saturated for sample
Degree, takes 100%, 90% ..., 10%；
S07 takes out device, is weighed after opening, calculates sample mass, is denoted as m1；Quantitative analysis filter paper is taken out, is gently wiped away
The soil body particle of adhesive surface measures its moisture content w with assay balance1, and the filter paper suction through prior calibration is closed with moisture content
It is that suction ψ is calculated in function1；
S08 continues air-dried sample, repeats S06 and S07, and it is m to measure sample mass respectively2、m3、…mnWhen suction ψ2、
ψ3、…ψn；
S09 finally measures sample moisture content θ with oven drying methodn, and the anti-sample mass that pushes away is m1、m2、…mn-1When moisture content
θ1、θ2、…θn-1, put and paint sample moisture content θ1、θ2、…θnWith suction ψ1、ψ2、…ψnChange curve, obtain mixing gravel clay soil-water
Indicatrix.
The filter paper suction is formula (2) with moisture content relation function：
In formula：ψ is suction, unit kPa；W is quantitative analysis filter paper moisture content, unit %.
The beneficial effects of the invention are as follows the soil―structure interactions that can measure the soil body containing greater particle size particle, and
Cost is relatively low, easy to operate.The method tested parallel can also be carried out at the same time by using several covering devices with shortening amount simultaneously
The time is surveyed, quickly obtains mixing gravel clay soil―structure interaction.
Description of the drawings
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is the sectional view of the present invention；
Fig. 3 is the structural schematic diagram of pedestal in the present invention；
Fig. 4 is the structural schematic diagram of top plate in the present invention；
Fig. 5 is the structural schematic diagram of partition board in the present invention；
In figure：1, test specimen tube；2, pedestal；3, partition board；4, top plate；5, connecting hole；6, connector；7, quantitative analysis filter paper.
Specific implementation mode
The present invention is further described below in conjunction with the accompanying drawings.
As shown in fig. 1~fig. 5, the device of gravel clay soil―structure interaction is mixed in a kind of filter paper method measurement, including test specimen tube 1,
Pedestal 2, partition board 3, top plate 4, connecting hole 5, connector 6 and quantitative analysis filter paper 7.The test specimen tube 1 is tight by two identical energy
The split cavity of close docking forms, and two split cavities are respectively fixedly disposed on two rectangular pedestals 2, the section and bottom of split cavity
2 corresponding sides of seat are tightly aligned；The partition board 3 is placed in sample preparation between two split cavities of test specimen tube 1, passes through connection
Part 6 closely connects, and is removed when measuring suction；The top plate 4 is placed on 1 top of test specimen tube after the completion of sample preparation, passes through company
Extension bar closely connects after passing through connecting hole 5；The quantitative analysis filter paper 7 is placed on two in test specimen tube 1 when measuring suction
Between semicolumn soil sample, two split cavities of test specimen tube 1 are directly connected to by connector 6 at this time.
Further, the both sides of the opposite face of two split cavities are both provided with the engaging lug of protrusion, the engaging lug with
The corresponding position of partition board 3 is both provided with for the through-hole across the connector 6.
Further, the test specimen tube 1, pedestal 2, partition board 3, top plate 4, connecting rod and connector 6 are all made of stainless steel
Material is made.
Further, the internal diameter of the test specimen tube 1 is 100mm, is highly 80mm, thickness 3mm, for measuring soil-water
The grain diameter for mixing gravel clay cobble-stone of indicatrix is 2~20mm.
Further, the thickness of the pedestal 2, partition board 3 and top plate 4 is 3mm.
Further, the corresponding position in the both sides of the test specimen tube 1 and partition board 3 is equipped with diameter 5mm screw holes, for connector
6 connections use, and connector 6 can be bolt or pin.
Further, as shown in Fig. 3~Fig. 4, the permeable hole of the pedestal 2 and top plate 4 equipped with several 2~3mm of diameter is excellent
It is selected as 2mm；And it is equipped with the connecting hole 5 of diameter 10mm in corresponding position, it connects and uses for connecting rod.Connecting hole 5 is set to
The relative position of the pedestal 2 and top plate 4 in the peripheral part of the test specimen tube 1.
Further, the quantitative analysis filter paper 7 is the II type filter paper of quantitative analysis of free from dust.
The present invention also provides a kind of methods that gravel clay soil―structure interaction is mixed in filter paper method measurement, include the following steps：
1) between partition board 3 being placed on two split cavities of test specimen tube 1, blending bolt connection；
2) sample dry density as required calculates the quality for mixing gravel clay, according to the water distribution of sample moisture content and mixes thoroughly, bored
Sample 12 hours, is then divided into 6 parts；
3) one layer of ordinary filter paper is spread in the bottom of test specimen tube 1, mix gravel clay loading test specimen tube 1 two got ready are split
In mould, divides 3 layers and hit reality, obtain two semicolumn soil samples；
4) one layer of ordinary filter paper is spread at the top of the sample made, is then covered top plate 4 on sample and with connecting rod and bottom
The closely connection of seat 2；
5) whole device is put into vacuum saturation cylinder together with sample and carries out pumping saturation, then clear water impregnates 12 hours, it
Top plate 4 and partition board 3 are removed afterwards, allow its natural air drying；
6) not timing weighs device together with sample, when sample declines certain mass, in two semicolumn samples
Between place quantitative analysis filter paper 7, two split cavities are closely connected with bolt, and be sealed in polybag, are then placed in moisturizing
Cylinder is placed 7 days, allows between soil sample and quantitative analysis filter paper 7 and reach suction equalization；
It is that sample mass drops to the estimation quality under required saturation degree that sample, which declines certain mass,
Estimation quality under required saturation degree is calculated by formula (1)：
In formula：ρdDry density, unit g/cm are preset for sample3；V is volume of sample, can be calculated by split cavity size
It arrives, unit cm3；GsIt is definite value, dimensionless, value 2.6 to mix gravel clay particle mean specific gravity；SrFor sample saturation degree, take
100%, 90% ..., 10%.
7) device is taken out, is weighed after opening, sample mass is calculated, is denoted as m1；Quantitative analysis filter paper 7 is taken out, is gently wiped away
The soil body particle of adhesive surface measures its moisture content w with assay balance1, and the filter paper suction through prior calibration is closed with moisture content
It is that suction ψ is calculated in function1；
The filter paper suction is formula (2) with moisture content relation function：
In formula：ψ is suction, unit kPa；W is quantitative analysis filter paper moisture content, unit %.
8) continue air-dried sample, it is m to repeat step 6) with sample mass 7), is measured respectively2、m3、…mnWhen suction ψ2、
ψ3、…ψn；
9) finally sample moisture content θ is measured with oven drying methodn, and the anti-sample mass that pushes away is m1、m2、…mn-1When moisture content
θ1、θ2、…θn-1, put and paint sample moisture content θ1、θ2、…θnWith suction ψ1、ψ2、…ψnChange curve, obtain mixing gravel clay soil-water
Indicatrix.
The above is only a preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (10)
1. the device of gravel clay soil―structure interaction is mixed in a kind of filter paper method measurement, it is characterised in that：Including by two split modules
At test specimen tube (1), the split cavity is separately fixed on pedestal (2), the relative edge of two pedestals (2) with its homonymy
The split cavity flush, partition board (3) or quantitative analysis filter paper (7) are movably set between two split cavities, and two is described right
It is connected by connector (6) between die sinking, test specimen tube (1) top is detachable to be connected with top plate (4).
2. the device of gravel clay soil―structure interaction is mixed in a kind of filter paper method measurement according to claim 1, feature exists
In：The connector (6) includes bolt or pin.
3. the device of gravel clay soil―structure interaction is mixed in a kind of filter paper method measurement according to claim 1, feature exists
In：It is closely connect by connecting rod between the top plate (4) and pedestal (2).
4. the device of gravel clay soil―structure interaction is mixed in a kind of filter paper method measurement according to claim 1, feature exists
In：The both sides of the opposite face of two split cavities are both provided with the engaging lug of protrusion, the corresponding position of the engaging lug and partition board (3)
Set the through-hole being both provided with for across the connector (6).
5. the device of gravel clay soil―structure interaction is mixed in a kind of filter paper method measurement according to claim 3：The pedestal
(2) and on top plate (4) be equipped with several permeable holes, the pedestal (2) and top plate (4) the test specimen tube (1) peripheral part
Relative position be provided with it is several for across the connecting rod connecting holes (5).
6. the device of gravel clay soil―structure interaction is mixed in a kind of filter paper method measurement according to claim 5, feature exists
In：A diameter of 2~3mm of the permeable hole；The grain diameter for mixing gravel clay cobble-stone is no more than the split cavity internal diameter
1/5.
7. the device of gravel clay soil―structure interaction is mixed in a kind of filter paper method measurement according to claim 1, feature exists
In：The pedestal (2) includes rectangular.
8. the device of gravel clay soil―structure interaction is mixed in a kind of filter paper method measurement according to claim 1, feature exists
In：The quantitative analysis filter paper (7) is the II type filter paper of quantitative analysis of free from dust.
9. a kind of method that gravel clay soil―structure interaction is mixed in filter paper method measurement, it is characterised in that：Include the following steps：
S01 between partition board (3) is placed on two split cavities of test specimen tube (1), is used in combination connector (6) to connect；
S02 calculates the quality for mixing gravel clay according to preset sample dry density, and take above-mentioned calculation amount mixes gravel clay, according to examination
The water distribution of sample moisture content is simultaneously mixed thoroughly, then bored sample at least 12 hours is divided into 6 parts；
S03 spreads one layer of ordinary filter paper in the bottom of test specimen tube (1), two for mixing gravel clay and being packed into test specimen tube (1) that S02 is got ready
In a split cavity, divides 3 layers and hit reality, obtain two semicolumn soil samples；
S04 spreads one layer of ordinary filter paper at the top of the sample made, then covers top plate (4) on sample and with connecting rod and bottom
Seat (2) closely connects；
Whole device is put into vacuum saturation cylinder together with sample and carries out pumping saturation by S05, and it is small to impregnate in clear water at least 12
When, top plate (4) and partition board (3) is removed later, allows its natural air drying；
S06, not timing weigh device together with sample, when sample mass drops to the estimation quality under required saturation degree
When, quantitative analysis filter paper (7) is placed between two semicolumn samples, closely connects two split cavities with connector (6), and close
It is enclosed in polybag, is then placed in moisturizing cylinder, place at least 7 days, allow between sample and quantitative analysis filter paper (7) to reach suction flat
Weighing apparatus；
Estimation quality under required saturation degree is calculated by formula (1)：
In formula：ρdDry density, unit g/cm are preset for sample3；V is volume of sample, can be calculated by split cavity size, single
Position is cm3；GsIt is definite value, dimensionless to mix gravel clay particle mean specific gravity；SrFor sample saturation degree, 100%, 90% ... is taken,
10%；
S07 takes out device, is weighed after opening, calculates sample mass, is denoted as m1；Quantitative analysis filter paper (7) is taken out, gently wipes table away
The soil body particle of face adhesion, its moisture content w is measured with assay balance1, and the filter paper suction through prior calibration and moisture content relationship
Suction ψ is calculated in function1；
S08 continues air-dried sample, repeats S06 and S07, and it is m to measure sample mass respectively2、m3、…mnWhen suction ψ2、ψ3、…
ψn；
S09 finally measures sample moisture content θ with oven drying methodn, and the anti-sample mass that pushes away is m1、m2、…mn-1When moisture content θ1、
θ2、…θn-1, put and paint sample moisture content θ1、θ2、…θnWith suction ψ1、ψ2、…ψnChange curve, it is special to obtain mixing gravel clay soil-water
Levy curve.
10. the method that gravel clay soil―structure interaction is mixed in a kind of filter paper method measurement according to claim 9, feature exist
In：The filter paper suction is formula (2) with moisture content relation function：
In formula：ψ is suction, unit kPa；W is quantitative analysis filter paper moisture content, unit %.
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| CN201810418360.1A CN108593486A (en) | 2018-05-04 | 2018-05-04 | The device and method of gravel clay soil―structure interaction is mixed in a kind of filter paper method measurement |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109459290A (en) * | 2018-12-25 | 2019-03-12 | 重庆交通大学 | A kind of NSCB sample preparation device and its application method for testing compacted cohesive soil I type fracture toughness |
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| CN109459290A (en) * | 2018-12-25 | 2019-03-12 | 重庆交通大学 | A kind of NSCB sample preparation device and its application method for testing compacted cohesive soil I type fracture toughness |
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Application publication date: 20180928 |