KR200390948Y1 - Disturbance Degree measurement device of soil sample - Google Patents

Abstract

The present invention relates to an apparatus for measuring disturbance degree of a sample excavated underground, and more particularly, to an apparatus capable of measuring the disturbance degree of a sample by measuring the sound pressure of the sample by an absorption force test. To this end, sealing means for receiving a sample 10 of a predetermined shape therein, the through-hole 39 is formed on one side; A porous member 30 inserted into the through hole 39 and having one side facing the sample 10; A connecting pipe 35 having one end connected to the through hole 39 and filled with a pressure transfer fluid therein; A pressure sensor 40 connected to the other end of the connection pipe 35 to an input side to measure a pressure of the pressure transfer fluid; And a pressure display means electrically connected to the pressure sensor 40 to display the pressure of the pressure transfer fluid.

Description

Disturbance degree measurement device of soil sample

The present invention relates to an apparatus for measuring disturbance degree of a sample excavated underground, and more particularly, to an apparatus capable of measuring the disturbance degree of a sample by measuring the sound pressure of the sample by an absorption force test.

In general, underground water is groundwater, and the soil (more specifically, mud or clay) buried beneath the groundwater contains water, and the soil and water are always in equilibrium under vertical loads. In other words, the soil particles and the water particles in the unit volume are equilibrated under pressure in the compressed state.

By the way, when excavation or drilling, underground soil mass (aka complete sample) is taken as the sample 10 as shown in Figure 1 and suddenly pulled up to the ground, there is no vertical load that worked. Then, the soil component (or soil particles) in the sample 10 expands, and the water is liquid, so that there is almost no change in volume. That is, disturbance of negative pressure occurs inside the sample 10 due to volume expansion of the sample 10. At this time, since the sample 10 is mud, the particles are fine, and the atmospheric pressure transmitted from the outside into the sample 10 is blocked to some extent.

Thus, the disturbance degree R defines the change in the pressure which arises internally by the volume expansion of the sample 10 as a ratio.

Disturbance (R) = (water pressure of the removed sample) / (initial water pressure)

The water pressure of the sample taken out from the disturbance degree R as described above is measured by the measuring device according to the present invention, and the initial water pressure can be known from the excavation depth and the height of the groundwater. Through the measurement of such disturbances, the internal state of the sample can be known, and the settlement and collapse of the soil can be predicted.

Accordingly, the present invention has been devised in view of the above-described conventional problems, and a first object of the present invention is to provide an apparatus for measuring disturbance using an absorption test on an excavated sample.

A second object of the present invention is to provide a device for measuring disturbance degree of a sample that can measure even a small pressure change of the excavated sample 10 and minimize a measurement error.

An object of the present invention as described above, the receiving means for receiving a sample 10 of a predetermined shape inside, the sealing means formed with a through hole 39 on one side;

A porous member 30 inserted into the through hole 39 and having one side facing the sample 10;

A connecting pipe 35 having one end connected to the through hole 39 and filled with a pressure transfer fluid therein;

A pressure sensor 40 connected to the other end of the connection pipe 35 to an input side to measure a pressure of the pressure transfer fluid; And

The disturbance of the sample can be achieved by a measuring device, which is connected to the pressure sensor 40 electrically and includes a pressure display means for displaying the pressure of the pressure transfer fluid.

And, the sealing means, the cylindrical housing 25 into which the cylindrical sample 10 can be inserted;

A lid 20 capable of sealing or opening the top of the housing 25; And

A bottom finishing member 37 for sealing the lower portion of the housing 25; may be configured.

In addition, the first sealing member 27 may be further formed on the circumferential circumference of the lid 20, and the second sealing member 32 may be further formed on the circumferential circumference of the bottom finishing member 37.

In addition, the through hole 39 is preferably made of silicon, and the porous member 30 is most preferably a ceramic porous member 30. And, the pressure transfer fluid may be water 47.

As another embodiment of the present invention, the sealing means, the cylindrical membrane that can be inserted into the cylindrical sample 10 therein;

A lid 20 capable of sealing or opening the top of the membrane; And

It may include; bottom sealing member 37 for sealing the lower portion of the membrane.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and the preferred embodiments associated with the accompanying drawings.

Hereinafter, an apparatus for measuring disturbance degree of a sample according to an embodiment of the present invention will be described with reference to the accompanying drawings. 1 is a perspective view of a sample 10 excavated underground to measure the degree of disturbance. The main components of the sample 10 are water and clay, and the size is 50 mm, 70 mm, and 100 mm in diameter, and a height of about 50 mm is sufficient. The reason that the sample 10 should be made of clay is because when negative pressure occurs inside due to the fine particles of clay, the inflow of atmospheric pressure can be blocked and the internal pressure can be maintained to some extent.

In addition, the absorption test used in the present invention is derived from the principle that the absorption of the sample and the degree of disturbance are inversely proportional. To this end, Figure 2 is a schematic configuration diagram of the disturbance degree measuring device 50 of the sample according to the present invention, Figure 3 is an enlarged cross-sectional view of the portion A of FIG. As shown in FIG. 2 and FIG. 3, the disturbance measuring device 50 may be composed of a housing 25, a pressure sensor 40, and a pressure monitor 45.

The housing 10 has an inner diameter enough to accommodate the sample 10 and may be made of steel, synthetic resin, or membrane.

The lid 20 is fitted to the upper portion of the housing 25 to be opened and closed, and a first sealing member 27 is provided around the lid 20 to seal the inside of the housing 25. A representative example of such a first sealing member 27 may be silicon packing, rubber, or the like.

The porous member 30 is inserted into the through hole 39 and fixedly fitted to the side of the housing 25. The porous member 30 is made of a ceramic material and has many voids formed therein, so that the water 47 can come into contact with the sample 10 in a state where water 47 is kept saturated. That is, while the porous member 30 transmits the negative pressure of the sample 10 to the water 47, the porous member 30 functions to prevent evaporation of the water 47 and to suppress bubble generation of the water 47. A representative example of such a porous member 30 is a high air entry valve ceramic porous material (High Air Entry Valve Ceramic Pourstone), is divided into 1 bar, 3 bar, 5 bar and the like according to the pressure criteria. For example, a 1 bar ceramic porous material does not pass the air pressure of 1 bar or less, passes only the air pressure of 1 bar or more, and water has a property that can always pass through the air gap regardless of the pressure. Such ceramic porous materials can be readily selected by those skilled in the art from commercially available products.

In the present exemplary embodiment, the porous member 30 is formed in a bar shape having a predetermined diameter, and one end thereof faces the sample 10 and transmits all of the sound pressures of the sample 10 through the predetermined interval with the sample 10.

The bottom finishing member 37 is provided with a second sealing member 32 around the circumference. The second sealing member 32 may have the same configuration as the first sealing member 27. The first and second sealing members 27 and 32 have a ring shape, and the inside of the housing 25 is completely sealed by the sealing member.

The through hole 39 is formed at a predetermined size in a substantially central area of the side surface of the housing 25, and allows the other surface of the porous member 30 to be exposed to the outside of the housing 25. The through hole 39 may be made of a silicon material to increase the sealing force.

One end of the connection pipe 35 is connected to the through hole 39, and the other end thereof is connected to the measurement side of the pressure sensor 40, and the inside of the connection pipe 35 is filled with a fluid that transmits pressure. A representative example of such a pressure transfer fluid is water 47. Since the water 47 has a low viscosity and a small volume change with respect to the pressure, the water 47 can accurately transmit the negative pressure generated in the sample 10. However, the present invention does not necessarily limit the pressure transfer fluid to water, and any one may be used as long as it can smoothly perform the pressure transfer function within the gist of the present invention.

The pressure sensor 40 is a device that measures the sound pressure sensed according to the movement of the water 47 and outputs it as an electrical signal. Since the internal configuration of the pressure sensor 40 is easy for those skilled in the art, a detailed description thereof will be omitted. In addition, any sensor capable of measuring the pressure of the fluid as described herein may be replaced by any type of pressure sensor.

The pressure monitor 45 is an apparatus for displaying the electric signal value transmitted by being connected to the pressure sensor 40 and the signal line 49. The pressure monitor 45 may display the pressure in an analog or digital manner, and may store a change in pressure as data by embedding a separate recording device (for example, a memory or a disk drive).

Hereinafter, the operation of the disturbance measuring device of the sample having the configuration as described above will be described. First, the sample 10 of the form shown in FIG. 1 is drilled from the clay ground under the groundwater which knows the depth. At this time, since the height of the groundwater is known, the pressure of the water applied to the sample 10 in the state of drilling can be calculated.

The sample 10 is then drilled and immediately placed inside the housing 25 to close and seal the lid 20. Then, the negative pressure is generated inside while the sample 10 expands due to the atmospheric pressure. At this time, the sample 10 has a property of absorbing air or water from the surroundings due to the negative pressure. However, since the periphery is sealed by the housing 25, the absorption phenomenon occurs through the porous member 30 on the side surface. At this time, the water 47 is sucked into the porous member 30, the movement of the water as a whole will occur.

This phenomenon of moving water is the same as that of water transferring pressure. That is, the pressure sensor 40 detects the pressure change of the water 47 in the connection pipe 35 and outputs it as an electrical signal. The sensor signal transmitted to the pressure monitor 45 through the signal line 49 is displayed as a value that can be seen by the operator. Therefore, the operator can know the water pressure value of the sample 10 by reading the pressure value of the pressure monitor 45.

The degree of disturbance can be calculated by substituting the stress value of water and the stress value of water measured by the pressure monitor 45 into the above [Equation 1]. This degree of disturbance is between zero and one. By measuring the degree of disturbance, soil settlement and collapse can be predicted.

As described above, according to the apparatus for measuring disturbance of a sample according to the present invention, the degree of disturbance may be measured using an absorption test on an excavated sample. This can be used as an objective criterion for determining the state of the sample.

In addition, even minute pressure changes of the excavated sample 10 can be measured, and measurement errors can be minimized. Therefore, it is possible to increase the reliability of the measured value by precise measurement.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, various other modifications and variations may be made without departing from the spirit and scope of the present invention. Accordingly, the scope of the appended utility model registration claims is intended to include such modifications and variations as fall within the true scope of the present invention.

1 is a perspective view of a sample 10 excavated underground to measure the degree of disturbance,

2 is a schematic configuration diagram of an apparatus for measuring disturbance of a sample according to the present invention;

3 is an enlarged cross-sectional view of a portion A in FIG. 2.

<Description of the symbols for the main parts of the drawings>

10: sample,

20: lid,

25: housing (membrane),

27: first sealing member,

30: porous member,

32: second sealing member,

35: connecting pipe,

37: floor finishing member,

39: through hole,

40: pressure sensor,

45: pressure monitor,

47: water,

49: signal line,

50: disturbance measuring device.

Claims (8)

Sealing means for accommodating a sample 10 having a predetermined shape therein and having a through hole 39 formed at one side thereof; A porous member 30 inserted into the through hole 39 and having one side facing the sample 10; A connecting pipe 35 having one end connected to the through hole 39 and filled with a pressure transfer fluid therein; A pressure sensor 40 connected to the other end of the connection pipe 35 to an input side to measure a pressure of the pressure transfer fluid; And Electrically connected to the pressure sensor 40, the disturbance measuring device of the sample comprising a pressure display means for displaying the pressure of the pressure transfer fluid. The method of claim 1, wherein the sealing means, A cylindrical housing 25 into which the cylindrical sample 10 can be inserted; A lid 20 capable of sealing or opening an upper portion of the housing 25; And And a bottom finishing member (37) for sealing the lower portion of the housing (25). The apparatus of claim 2, wherein a first sealing member (27) is further formed around the circumference of the lid (20). The apparatus of claim 2, wherein a second sealing member (32) is further formed around the circumference of the bottom finishing member (37). The apparatus of claim 2, wherein the through hole is made of silicon. The apparatus of claim 1, wherein the porous member is a ceramic porous member. The apparatus of claim 1, wherein the pressure transmission fluid is water (47). The method of claim 1, wherein the sealing means, A cylindrical membrane into which the cylindrical sample 10 can be inserted; A lid 20 capable of sealing or opening the top of the membrane; And Dispersion measuring device of the sample comprising a; bottom closing member (37) for sealing the lower portion of the membrane.