KR101740709B1 - Apparatus for measuring coefficient of Interface Permeability AND Permeability test method using thereof - Google Patents

Apparatus for measuring coefficient of Interface Permeability AND Permeability test method using thereof Download PDF

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KR101740709B1
KR101740709B1 KR1020150191410A KR20150191410A KR101740709B1 KR 101740709 B1 KR101740709 B1 KR 101740709B1 KR 1020150191410 A KR1020150191410 A KR 1020150191410A KR 20150191410 A KR20150191410 A KR 20150191410A KR 101740709 B1 KR101740709 B1 KR 101740709B1
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sample
sample mold
permeability coefficient
mold
permeability
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KR1020150191410A
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Korean (ko)
Inventor
신종호
박정만
김호종
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건국대학교 산학협력단
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
    • G01N15/0806—Details, e.g. sample holders, mounting samples for testing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
    • G01N15/082—Investigating permeability by forcing a fluid through a sample
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations

Abstract

The present invention relates to an apparatus for measuring the permeability of a boundary flow and a method for measuring the permeability coefficient at a boundary surface using the same, and more particularly, to a method of measuring the permeability coefficient by measuring the permeability coefficient by changing the size of a sample mold, The present invention provides an apparatus for measuring the permeability of a boundary surface flow which can increase the accuracy of a measurement value of a permeability coefficient of a sample because the permeability coefficient between the interface between the sample mold and the sample and the structure core and the sample can be measured, Flow permeability coefficient measurement method.
The upper and lower water tanks are respectively provided at the upper and lower portions of the frame, a sample mold installed between the upper water tank and the lower water tank and containing a sample of the water permeability coefficient measurement object, And a drain valve provided between the sample mold and the lower water tank for opening and closing a channel in which the water permeated through the sample mold falls into the lower water tank, Wherein the sample mold is provided in a plurality of columns having circumferences of various lengths and is detachably attached to the inlet valve and the drain valve, and the sample mold is the same as the permeability coefficient measurement target structure Wherein the sample mold further comprises a structure core having a roughness, and the sample mold constitutes a bottom portion of the sample mold And a wedge for a core including a coupling rod formed upward from a center of the piercing plate. The bottom of the structure core forms an insertion groove into which the coupling rod is inserted, The structure core may be vertically detachable in the interior of the sample mold, and the structure core may be detachably attached to the inside of the sample mold. The structure core may include a groove formed in the inner circumferential surface of the structure core, And is enclosed by a sample accommodated in the sample mold.

Description

TECHNICAL FIELD The present invention relates to an apparatus for measuring a permeability coefficient of a boundary surface,

The present invention relates to an apparatus for measuring the permeability coefficient of a boundary surface and a method for measuring permeability coefficient at a boundary surface using the same, and more particularly, to a method for measuring the permeability coefficient of a sample through a boundary surface between a sample and a sample mold, The present invention relates to an apparatus for measuring the permeability of a boundary flow and an apparatus for measuring the permeability of a boundary surface using the same.

In general, for construction of various construction structures, the structure is to be constructed after investigating the bearing capacity of the ground in the construction site, the structure of the strata, the coefficient of permeability, and the contamination degree of the ground.

That is, measurement of permeability of soil to the ground of a construction site is an essential obligation because it is a factor that has a great influence on the safety of the building in the construction of a high-rise building or a large-scale civil engineering work.

The permeability of the soil is necessary to determine the positive pressure on the soil dam, the river embankment, the permeability in the foundation ground, and the structure below the groundwater to design and construct the drainage hole.

The permeability of the soil is expressed as the permeability coefficient, which is the numerical value of the ability to transfer water through the porous medium.

It is an intrinsic value determined by the aqueous solution.

In particular, it is essential to submit the permeability coefficient for porous media to environments such as water related rivers, dams, reservoirs, groundwater, tunnels, civil engineering and construction works.

On the other hand, as a method of calculating the permeability coefficient for the penetration analysis of the ground, there is a field permeability test method which can reflect actual field stratification conditions and an indoor permeability test method which obtains a permeability coefficient at a different site by taking a sample of a site.

At this time, in the indoor permeability test method, the variable permeability test for obtaining the permeability coefficient using the relationship between the descent of the water level and the elapsed time caused by penetration into the sample having a certain diameter and length, There is a pure water permeability test in which the water permeability coefficient is obtained by measuring the amount of water penetrating within a certain time by the water level difference.

However, the above-mentioned conventional permeability coefficient measurement has the following problems.

First, both of the above technologies and various conventional technologies were measured using a mold having a constant cross section and length.

This means that the permeability coefficient is measured by carrying out the experiment without considering the flow at the interface between the mold and the sample.

The sample mold usually uses a mold made of metal or plastic. The flow of water between the samples and the flow of water at the sample-metal interface or at the sample-plastic interface are clearly different.

Accordingly, the conventional experiment does not consider the permeability coefficient between the interface of the sample and the sample mold, and thus the accuracy of the measured permeability coefficient is low.

Secondly, it is difficult to know the permeability coefficient due to the measurement of the permeability coefficient between the structure and the ground due to the measurement without consideration of the measurement conditions for measuring the permeability coefficient between the structure and the ground in the field.

In other words, it is important to measure not only the permeability coefficient of the ground surface but also the permeability coefficient at the interface between the structure and the ground. Since the permeability of the interface between the structure and the ground is not measured, There is a problem that it is difficult to raise the reliability of the product.

Korea Registration No. 10-0905090

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems described above, and it is an object of the present invention to provide a method of measuring a permeability coefficient of a sample mold, And a method of measuring the permeability coefficient at the interface using the permeability coefficient measurement apparatus.

Another object of the present invention is to provide a structure core having the same structure roughness as that of a site, which is installed in the interior of a sample mold, so that the permeability coefficient at the interface between the structure core and the sample is increased, Flow permeability coefficient measuring device and a method of measuring a permeability coefficient at a boundary surface using the same.

According to an aspect of the present invention, there is provided an apparatus for measuring a coefficient of permeability, comprising: a frame; an upper water tank and a lower water tank provided respectively at upper and lower portions of the frame; a sample mold installed between the upper water tank and the lower water tank; An inlet valve provided between the upper water tank and the sample mold for opening and closing a channel in which the water in the upper water tank is dropped into the sample mold and a water supply valve provided between the sample mold and the lower water tank, And a drain valve for opening and closing the pipeline, the apparatus comprising: a plurality of sample molds having circumferences of various lengths, the sample mold being detachably mountable to the inlet valve and the drain valve, Further comprises a structure core having the same roughness as that of the permeability coefficient measurement target structure, And a wedge for a core which forms a bottom portion of the sample mold and has a plurality of permeable holes formed therein and an engaging rod formed upward from the center of the perforated plate, Wherein the structure core comprises a groove formed on an inner circumferential surface of the structure core and a ball spring provided on an outer circumferential surface of the joint rod, Wherein the measurement unit is installed vertically detachably in the interior of the sample mold and is surrounded by the sample contained in the sample mold.

In another aspect of the present invention, there is provided a method of measuring a permeability coefficient using an interface permeability coefficient measuring apparatus, comprising the steps of: (a) preparing a sample in a sample mold; (b) (C) repeating steps (a) and (b), changing the size of the sample mold and measuring the permeability coefficient K 0 of the ground surface (D) obtaining a boundary coefficient K S1 between the sample mold and the sample,

The K S1 ,

Figure 112015129442507-pat00001

L = height of sample mold

Δh = difference in height between the upper tank and the lower tank

Q S = flow rate at the interface between the sample mold and the sample

S 1 = πD 1 (circumferentially of the sample mold)

t = measuring time

The method of measuring a permeability coefficient of a boundary flow according to claim 1,

In another aspect of the present invention, there is provided a method of fabricating a sample mold, comprising the steps of: providing a permeability coefficient (K 0 ) of a paperboard and a permeability coefficient (K S1 ) (C) installing a sample mold on a measuring device and then performing a penetration test to measure the permeated flow rate; (d) ) Calculating a boundary water permeability coefficient K S2 between the structure core and the sample through flow measurement through the step (c)

K S2 is a value

Figure 112015129442507-pat00002

Q 0 = Ground flow rate

Q S = interface flow

Figure 112015129442507-pat00003
The permeability coefficient is calculated by the following equation: < EMI ID = 1.0 >

The apparatus for measuring the permeability of the interface according to the present invention and the method for measuring the permeability of the interface using the same have the following effects.

First, the permeability coefficient (K 0 ) of the ground surface and the permeability coefficient (K S1 ) at the interface between the sample mold and the sample can be measured by changing the permeability coefficient by changing a plurality of sample molds having different circumferential lengths. There is an effect that accuracy can be improved.

This is because the permeability coefficient is measured in consideration of the characteristics of the sample mold material, so that the permeability coefficient value with higher accuracy can be calculated.

Second, since a structure core having the same roughness as that of the site structure can be installed in the sample mold, the permeability coefficient at the interface between the structure core and the sample can be measured, thereby improving the accuracy of the measurement of the permeability coefficient.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing an apparatus for measuring the boundary flow permeability coefficient according to a preferred embodiment of the present invention; FIG.
2 is a graph showing an average permeability coefficient according to a circumferential length change of a sample mold using a boundary flow permeability coefficient measuring apparatus according to a preferred embodiment of the present invention.
3 is a flowchart showing a method of measuring permeability coefficient using an apparatus for measuring boundary flow permeability coefficient according to a preferred embodiment of the present invention
FIG. 4 is a view showing an apparatus for measuring the boundary flow permeability coefficient according to another embodiment of the present invention. FIG.
5 is an exploded perspective view showing a wedge for a core of a structure core and a core of a sample mold of an apparatus for measuring an interface flow permeability coefficient according to another embodiment of the present invention.
6 is a flowchart illustrating a method of measuring a permeability coefficient using an apparatus for measuring a boundary flow permeability coefficient according to another embodiment of the present invention.

It is to be understood that the words or words used in the present specification and claims are not to be construed in a conventional or dictionary sense and that the inventor can properly define the concept of a term in order to describe its invention in the best possible way And should be construed in light of the meanings and concepts consistent with the technical idea of the present invention.

Hereinafter, an apparatus for measuring the bounded surface water permeability coefficient according to a preferred embodiment of the present invention and a method for measuring the bounded surface flow permeability coefficient using the same will be described with reference to FIGS. 1 to 3 attached hereto.

The interface permeability coefficient measuring device has a technical feature in which the coefficient of permeability can be measured while changing the sample mold of the circumferential surface of different size.

That is, in the process of measuring the permeability coefficient, the permeability coefficient considering the influence of the sample mold and the sample interface can be calculated as the size of the sample mold is changed, so that the accuracy of the permeability coefficient measurement value can be increased.

The interface flow permeability coefficient measuring apparatus for this purpose comprises a frame 100, a water tank 200, a sample mold 300, and a valve 400.

The frame 100 constitutes a frame of the permeability coefficient measuring device, and the equipment for measurement is installed.

The water tank 200 is configured to store water used in the measurement of the water permeability coefficient. The water tank 200 includes an upper water tank 210 and a lower water tank 220.

The upper water tank 210 is configured to store water for infiltrating water into the sample, and is installed on the upper part of the frame 100.

At this time, the upper water tank 210 is provided with a channel 211 through which water in the water tank falls.

The lower water tank 220 is installed below the frame 100 to penetrate the sample, store the water, and measure the flow rate of the water.

At this time, the lower water tank 220 is provided with a channel 221 through which water permeated from the sample falls.

Next, the sample mold 300 is configured to accommodate a sample as a measurement object of permeability coefficient, and is detachably attached to the frame 100.

At this time, the sample mold 300 is preferably formed in a cylindrical shape, and a perforated plate 310 is installed at the bottom of the sample mold 300 so that water permeated with the sample can be drained.

As shown in FIG. 1, the sample mold 300 is not fixed in a specific size, but a plurality of sample molds 300 having different circumferential lengths are provided.

That is, according to the present invention, a plurality of sample molds 300 having different sizes can be alternately installed on the frame 100 to measure the coefficient of permeability, and there is a technical feature that the sample molds 300 of various sizes are provided will be.

This is because the permeability coefficient measurement using a plurality of sample molds 300 having different sizes can be performed several times, and it is possible to grasp the influential influence of the water flowing at the interface between the sample and the sample mold 300. The permeability coefficient measurement To increase the accuracy of the permeability measurement.

As described above, the permeability coefficient value measured while varying the size of the sample mold 300 can be shown in a graph as shown in FIG. 2, whereby the permeability coefficient (K 0 ) of the ground surface can be obtained.

The valve 400 removes the sample mold 300 from the frame 100 and opens and closes the conduits 211 and 221 communicating with the sample mold 300.

The valve 400 is provided between the inlet valve 410 and the conduit 221 of the lower water tank 220 and the sample mold 300 for opening and closing the pipeline 211 of the upper water tank 210 and the sample mold 300 And a drain valve 420 for opening and closing.

At this time, the coupling structure between the valve 400 and the sample mold 300 is not limited to a specific configuration, but may be configured to be detachable from each other.

1, a burette member 500, a vacuum pump 600, and a drainage tank 700 are provided in the permeability coefficient measuring apparatus.

The burette member 500 is configured to vary the water level of the upper water tank 210 for the above variable measurement, and the vacuum pump 600 serves to make the inside of the sample mold 300 vacuum.

That is, the vacuum pump 600 operates to saturate the interior of the sample mold 300 to increase the accuracy of measurement of the permeability coefficient, and to maintain the degree of vacuum of the sample mold 300 at 80 Kpa or more.

The drainage water tank 420 is provided in the lower water tank 220 to drain the water permeated from the sample mold 300 so that the water level of the water permeated from the sample mold 300 can be kept constant while being discharged. .

Hereinafter, a method of measuring the permeability coefficient using the interface flow permeability coefficient measuring apparatus having the above-described configuration will be described.

A plurality of sample molds 300 having various circumferential lengths are provided, and the sample of permeability coefficient measurement object is accommodated in the sample mold 300. (S100)

At this time, the sample mold 300 is provided in a plurality of sizes ranging from the smallest circumference length to the largest circumference length.

Thereafter, the sample is charged into the sample mold 300 having the smallest circumferential size, and the sample is subjected to a compaction operation.

Next, the sample mold 300 is installed on the frame 100 of the permeability coefficient measurement apparatus (S20))

At this time, the sample mold 300 is connected to the inlet valve 410 provided in the pipeline 211 of the upper water tank 210 and the drain valve 420 installed in the pipeline 221 of the lower water tank 220, respectively.

Thereafter, the degree of vacuum in the sample mold 300 is maintained by using the vacuum pump 600, the water in the upper water tank 210 is dropped, and the water falls into the sample in the sample mold 300 (S300)

At this time, the water permeated through the sample falls through the channel 221 connected to the lower water tank 220 and is accommodated in the lower water tank 220.

At this time, the temperature of the water collected in the lower water tank 220 is measured. By measuring the permeability coefficient through the correction of the temperature of the water, it is possible to increase the accuracy of the permeability measurement value of the groundwater later.

Then, the flow rate of the water collected in the lower water tank 220 is measured.

At this time, the permeability coefficient measurement through the temperature correction is preferably performed about 3 times, and the permeability coefficient measurement value can be optimized when the water temperature of the permeated water is approximately 15 degrees.

At this time, the equation for calculating the permeability coefficient (K T ) through the flow measurement is as follows.

Figure 112015129442507-pat00004

K T = permeability coefficient at T ° C (cm / sec)

L = height of sample mold (cm)

A = cross-sectional area of sample mold (cm 2)

Δh = the water level difference between the upper tank and the lower tank

Q = flow rate (cm < 3 >)

t = measurement time (sec)

Next, it is determined whether the circumferential size of the sample mold 300 having undergone the flow measurement is larger than the circumference of the largest sample mold 300 among the plurality of sample molds (S400)

At this time, if the size of the sample mold 300 is smaller than the largest size of the sample mold 300, the above-described series of steps is repeated (S410)

In this case, it is preferable that the permeability coefficient values calculated while repeating the above-described series of processes are plotted in a graph, and an example thereof is shown in FIG.

If it is determined that the sample mold 300 having the largest size of the sample mold 300 has been measured, the permeability coefficient is converged to obtain the groundwater permeability coefficient K 0 (S500)

The permeability coefficient (K 0 ) of the ground surface layer is a value within a range in which the permeability coefficient value does not change even if the size of the sample mold 300 is changed, and it can be seen from FIG. 2 that the permeability coefficient is approximately 0.0514 (cm / sec).

Next, the permeability coefficient (K S1 ) at the interface between the sample mold and the sample is calculated using the calculated permeability coefficient of the ground surface (S600).

At this time, the equation for obtaining the boundary surface permeability coefficient (K S1 ) using the permeability coefficient (K S0 ) of the ground surface is as follows.

Figure 112015129442507-pat00005

Figure 112015129442507-pat00006

Q 0 = Ground flow rate

Q S = interface flow

S 1 =? D 1 (D 1 : circumferential length of the sample mold)

Thus, a method of calculating the boundary surface coefficient K S1 between the sample mold and the sample using the permeability meter according to the preferred embodiment of the present invention is completed.

Meanwhile, an apparatus and a method for measuring the permeability coefficient at the interface between the structure and the ground are provided, and this will be described as another embodiment of the present invention.

Prior to description, the same components as those of the preferred embodiment are denoted by the same reference numerals, and a detailed description thereof will be omitted.

The permeability coefficient measuring apparatus according to another embodiment is constructed in the same manner as in the preferred embodiment, and the sample mold 300 has a different structure.

The sample mold 300 has a technical feature comprising a structure core 320.

The structure core 320 is made of a material having roughness equal to the roughness of the structure to be measured and vertically detachably coupled to the interior of the sample mold 300.

Meanwhile, the sample mold 300 includes the core wedge 330.

The core wedge 330 is a structure in which the structure core 320 is coupled and includes a perforated plate 331 and a coupling rod 332.

The perforated plate 331 constitutes a bottom portion of the sample mold 300 and forms a plurality of water holes 331a through which water permeated from the sample is drained.

The coupling rod 332 is configured to be inserted into the bottom of the structure core 320 as a portion to which the structure core 320 is fixed.

Accordingly, it is preferable that an insertion groove 321 corresponding to the coupling rod 332 is formed on the bottom surface of the structure core 320.

Meanwhile, a detachable unit 800 may be provided between the structure core 320 and the core wedge 330 to facilitate detachment of the structure core 320.

5, the detachment means 800 includes a groove 810 formed in the inner peripheral surface of the insertion groove 321 of the structure core 320 and a ball spring 820 installed on the outer peripheral surface of the coupling rod 332 do.

In the process of inserting the coupling rod 332 into the insertion groove 321 of the structure core 320, since the ball spring 820 is located in the groove 810 while being expanded and contracted, The joining of the joining rods 332 can be carried out easily and accurately.

Hereinafter, a method of measuring the permeability coefficient between the interface of the structure core and the sample using the permeability coefficient measuring apparatus having the above configuration will be described with reference to FIG.

A sample mold 300 and a sample are prepared (S100)

At this time, the structure core 320 is coupled to the perforated plate 331 of the core wedge 330 constituting the bottom of the sample mold 300 to perform a preparation process as a sample mold for accommodating the sample.

Thereafter, when the structure core 320 is coupled to the interior of the sample mold 300, the sample is injected into the interior of the sample mold 300 and the compaction operation is performed.
Accordingly, the structure core 320 is surrounded by the sample accommodated in the sample mold 300, as shown in FIG.

Next, when the sample is prepared as described above, the sample mold 300 is placed on the frame 100 of the measuring apparatus (S200)

At this time, a water inlet valve 410 installed in the pipeline 211 of the upper water tank 210 and a water drain valve 420 installed in the pipeline 221 of the lower water tank 220 are installed at the upper and lower portions of the sample mold 300 .

Next, the water inlet valve 410 of the upper water tank 210 and the water drain valve 420 of the lower water tank 220 are opened, and the water in the upper water tank 210 is dropped to perform the penetration test (S300)

At this time, the flow rate of water falling through the sample in the sample mold 300 is measured.

Next, using the permeability coefficient (K 0 ) of the ground section calculated through the preferred embodiment and the permeability coefficient (K S1 ) between the sample mold and the sample, the permeability coefficient between the interface of the core and the sample to be obtained in another embodiment (K S2 ) (S400)

The equation for calculating the permeability coefficient (K S2 ) between the interface between the structure core and the sample using the permeability coefficient (K 0 ) of the ground surface and the permeability coefficient (K S1 ) between the sample mold and the sample is as follows.

Figure 112015129442507-pat00007

K S2 can be calculated through the above equation,

A ' 0 is the value obtained by subtracting the area of the structure core from the total area of the sample, not the total area of the sample, and satisfies the following equation.

Figure 112015129442507-pat00008

This completes the calculation of the permeability coefficient (K S2 ) between the interface of the structure core and the sample.

On the other hand, when the permeability of the sample is small and a precise permeability test is required, the permeability test is carried out on the variable.

At this time, the test method shall be carried out in accordance with the test method of variable strength above.

In this case, only the test method is changed over the variables. In the test setting, K 0 and K S1 are obtained by gradually increasing the sample mold as in the permeability measurement method according to the preferred embodiment described above, and then the permeability coefficient measurement method according to another embodiment The procedure for obtaining the boundary face coefficient K S2 is carried out in the same manner.

As described above, the apparatus for measuring the permeability of the interface according to the present invention and the method for measuring the permeability of the interface using the same are capable of measuring the permeability coefficient at the interface between the sample and the sample mold, Feature.

As a result, various conditions for measuring the permeability coefficient can be measured, for example, the permeability coefficient of the sample mold and the sample interface depending on the material of the sample mold, and the permeability coefficient at the interface between the sample and the structure. The accuracy of the measurement can be increased to increase the reliability of the measurement value.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art.

100: frame 200: aquarium
210: upper water tank 211, 221:
220: Lower water tank 300: Sample mold
310,331: perforated plate 320: structure core
321: insertion groove 330: wedge for core
332: Coupling rod 400: Valve
410: incoming valve 420: drain valve
500: burette member 600: vacuum pump
700: drainage tank 800: detachment means
810: groove 820: ball spring

Claims (6)

frame;
An upper water tank and a lower water tank provided respectively at upper and lower portions of the frame;
A sample mold provided between the upper water tank and the lower water tank, the sample mold containing a sample of the water permeability coefficient measurement object;
An inlet valve provided between the upper water tank and the sample mold for opening and closing a channel in which the water in the upper water tank is dropped into the sample mold and a water supply valve provided between the sample mold and the lower water tank, 1. A boundary flow permeability coefficient measuring device comprising a drain valve for opening and closing a channel,
Wherein the sample mold is provided with a plurality of circumferences of various lengths and is detachably attached to the inlet valve and the drain valve,
Wherein the sample mold further comprises a structure core having the same roughness as the permeability coefficient measurement target structure,
In the sample mold,
And a wedge for core comprising a piercing plate having a plurality of permeable holes formed therein and a connecting rod formed upward from a center of the piered plate,
The bottom of the structure core forms an insertion groove into which the coupling rod is inserted,
And a detachment means is provided between the insertion groove and the engagement rod,
A groove formed in the inner peripheral surface of the structure core,
And a ball spring provided on an outer peripheral surface of the coupling rod,
Wherein the structure core is vertically detachably installed in the interior of the sample mold and is surrounded by the sample contained in the sample mold. delete delete delete 11. A method for measuring permeability coefficient using an apparatus for measuring the permeability of a boundary flow according to claim 1,
(a) preparing a sample in a sample mold;
(b) placing a sample mold on a measuring device, performing a penetration test to measure the permeated flow rate;
(c) repeating steps (a) and (b), measuring the size of the sample mold to determine the coefficient of permeability K 0 of the ground;
(d) obtaining a boundary coefficient of permeability K S1 between the sample mold and the sample,
The K S1 ,
Figure 112015129442507-pat00009

L = height of sample mold
Δh = difference in height between the upper tank and the lower tank
Q S = flow rate at the interface between the sample mold and the sample
S 1 = πD 1 (circumferentially of the sample mold)
t = measuring time
Wherein the boundary flow permeability coefficient measurement method comprises the steps of: (K 0 ) calculated from claim 5 and a boundary surface coefficient of permeability (K S1 ) between the sample mold and the sample are provided,
(a) installing a structure core in a sample mold;
(b) receiving the sample in the sample mold;
(c) installing a sample mold on a measuring device, performing a penetration test to measure the permeated flow rate;
(d) obtaining a boundary water permeability coefficient K S2 between the structure core and the sample through flow measurement through the step (c), and
K S2 is a value
Figure 112015129442507-pat00010

Q 0 = Ground flow rate
Q S = interface flow
Figure 112015129442507-pat00011
Wherein the permeability coefficient is calculated through an equation satisfying the following equation: < EMI ID = 1.0 >




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CN110376352A (en) * 2019-06-28 2019-10-25 浙江大学 A kind of waterpower boundary point level control device
CN114324113A (en) * 2021-12-30 2022-04-12 福州大学 Test device and method for measuring permeability coefficient and permeability path of soil-structure interface
KR102436913B1 (en) * 2022-06-22 2022-08-25 한국시험연구원(주) Undisturbed soil sample collecting and permeability testing method for in-situ permeability test

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Publication number Priority date Publication date Assignee Title
CN110376352A (en) * 2019-06-28 2019-10-25 浙江大学 A kind of waterpower boundary point level control device
CN110376352B (en) * 2019-06-28 2020-07-03 浙江大学 Hydraulic boundary point position control device
CN114324113A (en) * 2021-12-30 2022-04-12 福州大学 Test device and method for measuring permeability coefficient and permeability path of soil-structure interface
KR102436913B1 (en) * 2022-06-22 2022-08-25 한국시험연구원(주) Undisturbed soil sample collecting and permeability testing method for in-situ permeability test

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