CN112067528A - Porosity measuring device and porosity measuring method - Google Patents
Porosity measuring device and porosity measuring method Download PDFInfo
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- CN112067528A CN112067528A CN202011066083.6A CN202011066083A CN112067528A CN 112067528 A CN112067528 A CN 112067528A CN 202011066083 A CN202011066083 A CN 202011066083A CN 112067528 A CN112067528 A CN 112067528A
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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
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
Abstract
The embodiment of the invention provides a porosity measuring device and a porosity measuring method, and relates to the technical field of porosity measurement. The porosity measuring device comprises a first container, a communicating pipe, a second container and a vacuum pump; the first container is filled with liquid, the first container is communicated with one end of the communicating pipe, the other end of the communicating pipe is communicated with the second container, the second container is used for placing a sample to be tested, and the vacuum pump is connected with the second container. A first valve is arranged between the vacuum pump and the second container, and a second valve is arranged between the second container and the communicating pipe; the vacuum pump is used for controlling the pressure of the second container under the state that the first valve is opened and the second valve is closed. Through observing the change of liquid level height in the first container, can calculate the porosity of the sample that awaits measuring, simple structure, convenient operation, detection speed is fast, and this porosity measuring device portable is fit for carrying out measurement work in the field.
Description
Technical Field
The invention relates to the technical field of porosity measurement, in particular to a porosity measurement device and a porosity measurement method.
Background
At present, the mainstream methods for measuring the porosity of soil mainly comprise a water absorption method, a gas expansion displacement method and the like. The water absorption method comprises the steps of firstly taking sample soil by using a cutting ring, placing the sample soil and the cutting ring in a container containing water, enabling the water level to be not higher than the height of the cutting ring, soaking for 24 hours, weighing, then placing in an oven at 105 ℃ for 24 hours, and weighing again the dried soil sample to obtain the volume saturation water content. Since the specific gravity of water is 1, the volume saturation water content is theoretically directly equal to the porosity. The measuring cycle of this kind of mode is long, and the muddy water easily pollutes measuring device after soaking, and unable used repeatedly of short time.
The gas expansion replacement method comprises the steps of firstly recording the diameters and the lengths of the steel discs and the rock sample, then adjusting the atmospheric pressure of the rock chamber, placing the sample, rotating the T-shaped rotating handle, adjusting the pressure to 560kPa, recording the pressure P1 of the standard chamber, then expanding gas to the rock chamber, recording the equilibrium pressure P2, and finally calculating the volume of each steel disc and the appearance volume of the rock mass according to a formula. The measuring method has the advantages of low precision, pressurization, high safety requirement in the operation process, limited use place and inconvenience in carrying.
Disclosure of Invention
Objects of the present invention include, for example, providing a porosity measuring apparatus and a porosity measuring method, which can shorten a measuring period and improve measuring efficiency; the precision is high, convenient operation, safety, portable, be suitable for open-air measurement work, need not to take the sample back to the laboratory and measure.
Embodiments of the invention may be implemented as follows:
in a first aspect, an embodiment of the present invention provides a porosity measurement apparatus, including a first container, a communication pipe, a second container, and a vacuum pump; the first container is filled with liquid, the first container is communicated with one end of the communicating pipe, the other end of the communicating pipe is communicated with the second container, the second container is used for placing a sample to be tested, and the vacuum pump is connected with the second container;
a first valve is arranged between the vacuum pump and the second container, and a second valve is arranged between the second container and the communicating pipe; the vacuum pump is used for controlling the pressure of the second container under the state that the first valve is opened and the second valve is closed.
In an optional embodiment, the communication pipe includes a first communication pipe and a second communication pipe, one end of the first communication pipe is communicated with the first container, the other end of the first communication pipe is communicated with one end of the second communication pipe, and the other end of the second communication pipe is communicated with the second container.
In an alternative embodiment, the diameter of the first communication pipe is larger than the diameter of the second communication pipe.
In an alternative embodiment, the first communication pipe has a diameter of 2cm to 4cm and the second communication pipe has a diameter of 0.5cm to 1 cm.
In an alternative embodiment, the first communication tube has a volume of 30ml to 50 ml.
In an optional embodiment, the second communicating pipe includes a first vertical section, a horizontal section, and a second vertical section, one end of the first vertical section is communicated with the first communicating pipe, the other end of the first vertical section is communicated with one end of the horizontal section, the other end of the horizontal section is communicated with one end of the second vertical section, and the other end of the second vertical section is communicated with the second container.
In an alternative embodiment, the first vertical section has a volume of 10ml to 20 ml.
In an alternative embodiment, the volume of the first container and the volume of the second container are equal.
In an alternative embodiment, the second container is provided with a vent valve.
In a second aspect, an embodiment of the present invention provides a porosity measurement method applied to the porosity measurement apparatus according to any one of the foregoing embodiments, including:
before a sample to be detected is placed, the first valve is opened, the second valve is closed, and the vacuum pump controls the pressure in the second container to be a preset pressure;
closing the first valve, opening the second valve, and recording a first liquid level of the liquid;
placing a sample to be tested in the second container;
opening the first valve, closing the second valve, opening the vacuum pump to control the pressure in the second container to be the preset pressure, and closing the first valve; opening the second valve and recording a second liquid level of the liquid;
and calculating the porosity of the sample to be detected according to the first liquid level height and the second liquid level height.
The beneficial effects of the embodiment of the invention include, for example:
according to the porosity measuring device provided by the embodiment of the invention, the first container is communicated with the second container through the communicating pipe, liquid is arranged in the first container, the sample to be measured is placed in the second container, the pressure in the second container is controlled to be a preset pressure through the vacuum pump, the first container is communicated with the second container through the second valve, the liquid level in the first container is changed by utilizing the air pressure difference between the first container and the second container, and the liquid level height difference in the first container is converted into the porosity of the sample to be measured. The porosity measuring device has the advantages of simple structure, small volume, portability and flexible and convenient use, can be used for field measurement, and does not need to bring a sample to be measured back to a laboratory for measurement; and the measuring efficiency is high, and the result is accurate and reliable.
According to the porosity measuring method provided by the embodiment of the invention, the air pressure of the second container is controlled through the vacuum pump, and the air pressure difference between the first container and the second container is utilized, so that after the first container is communicated with the second container, the air pressure difference drives the liquid level in the first container to change, and the porosity of the sample to be measured is calculated according to the moving height of the liquid level. The porosity measuring method is simple to operate, high in safety, short in measuring period, high in efficiency and accurate and reliable in result. The device can be used for laboratory measurement and field measurement, is flexible to use, and has great popularization and application values.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic diagram of a first configuration of a porosity measurement device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a porosity measurement apparatus according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a porosity measurement apparatus according to an embodiment of the present invention.
Icon: 10-a porosity measuring device; 110-a first container; 111-a breather pipe; 113-an air inlet valve; 120-a second container; 121-a scaffold; 130-a communicating tube; 131-a first communicating pipe; 132-a second communication tube; 133-a first vertical section; 134-horizontal segment; 135-a second vertical section; 140-a vacuum pump; 151-first valve; 152-a second valve; 153-exhaust valve; 155-pressure sensor.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. indicate an orientation or a positional relationship based on that shown in the drawings or that the product of the present invention is used as it is, this is only for convenience of description and simplification of the description, and it does not indicate or imply that the device or the element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
Soil porosity refers to the percentage of the volume of the soil pores in the volume of the soil body. In nature, water and air coexist and fill in soil pore systems, and soil pores are places for water movement and storage and are also key factors influencing soil permeability and determining surface runoff yield and runoff production time. Soil porosity can be generally classified into three classes, i.e., macropores, mesopores, and microvoids.
Most of the existing soil porosity measurement methods are carried out in a laboratory, namely, a sample needs to be brought back to the laboratory for measurement, and the sample is difficult to be completely stored from the collection of a soil sample to the transportation back to the laboratory, so that the final test result is not ideal, the test period is long, and the efficiency is low.
In order to overcome the defects in the prior art, the embodiment of the invention provides a porosity measuring device 10 and a porosity measuring method, which can shorten the measuring period and improve the measuring efficiency; the precision is high, convenient operation, safety, portable, be suitable for open-air measurement work, need not to take the sample back to the laboratory and measure.
First embodiment
Referring to fig. 1, the present embodiment provides a porosity measurement apparatus 10, including a first container 110, a connection pipe 130, a second container 120, and a vacuum pump 140; the first container 110 is filled with liquid, the connection pipe 130 is used for connecting the first container 110 and the second container 120, namely, the first container 110 is connected with one end of the connection pipe 130, the other end of the connection pipe 130 is connected with the second container 120, the second container 120 is used for placing a sample to be tested, and the vacuum pump 140 is connected with the second container 120; a first valve 151 is disposed between the vacuum pump 140 and the second container 120, the first valve 151 can be selectively opened or closed, the first valve 151 is opened to connect the vacuum pump 140 and the second container 120, and the first valve 151 is closed to isolate the vacuum pump 140 from the second container 120. A second valve 152 is arranged between the second container 120 and the communicating pipe 130; the second valve 152 can be selectively opened or closed, and the second valve 152 is opened to communicate the communication pipe 130 with the second container 120, i.e. the first container 110 and the second container 120 are communicated with each other; the second valve 152 is closed to block the connection pipe 130 from the second container 120. Optionally, a second valve 152 is disposed at an end of the connection pipe 130 near the second container 120, which facilitates quick response of the liquid in the first container 110 under the action of the pressure difference. The vacuum pump 140 is used to control the pressure in the second container 120 in a state where the first valve 151 is opened and the second valve 152 is closed. After the sample to be measured is placed in the second container 120, the first container 110 and the second container 120 are separated from each other, the vacuum pump 140 is started to control the pressure of the second container 120, and then the first container 110 is communicated with the second container 120, so that the liquid level in the first container 110 moves upwards due to the air pressure difference between the first container 110 and the second container 120, and the porosity of the sample to be measured can be calculated through the change of the liquid level. This porosity measuring device 10 simple structure, convenient operation, the measurement process security is high, and measurement cycle is short, and is efficient, and the result is reliable to portable is applicable to the field and carries out measurement work.
Further, the communication pipe 130 in this embodiment includes a first communication pipe 131 and a second communication pipe 132, one end of the first communication pipe 131 is communicated with the first receptacle 110, the other end of the first communication pipe 131 is communicated with one end of the second communication pipe 132, and the other end of the second communication pipe 132 is communicated with the second receptacle 120. Wherein the diameter of the first communication pipe 131 is larger than that of the second communication pipe 132. Optionally, the diameter of the first communication pipe 131 is 2cm to 4cm, the wall thickness is greater than or equal to 1mm, so as to meet the strength requirement and improve the safety of the porosity measurement device 10, and the volume of the first communication pipe 131 is 30ml to 50 ml. It should be noted that the porosity measuring device 10 is mainly used for measuring the porosity of soil, and of course, the porosity of other objects may be measured, and is not limited in this respect. Taking the measurement of the porosity of soil as an example, the diameter and volume of the first communication pipe 131 may be appropriately changed according to the type of soil to be measured.
Optionally, the diameter of the second communication pipe 132 is 0.5cm to 1cm, and the thickness of the inner wall is 1mm or more, so as to meet the strength requirement. In this embodiment, the second communication pipe 132 includes a first vertical section 133, a horizontal section 134, and a second vertical section 135, one end of the first vertical section 133 is communicated with the first communication pipe 131, the other end of the first vertical section 133 is communicated with one end of the horizontal section 134, the other end of the horizontal section 134 is communicated with one end of the second vertical section 135, and the other end of the second vertical section 135 is communicated with the second container 120. Further, the diameter of the first vertical section 133 is 0.6cm, and the volume of the first vertical section 133 is 10ml to 20 ml. It is easily understood that the diameter of the first communication pipe 131 and the diameter of the second communication pipe 132 should be as precise as possible in order to observe the liquid level height, i.e., to observe the change in the volume of the rising water. Similarly, the diameter and volume of the second communicating pipe 132 can be adjusted and replaced according to the actually measured soil type, so as to improve the accuracy of the measurement result. In other alternative embodiments, the shape of the second communication pipe 132 may also be U-shaped or other shapes, as shown in fig. 2, that is, the horizontal section 134 in fig. 1 is designed to be arc-shaped. Of course, the horizontal section 134 may also be any shape such as V-shape, M-shape, spiral shape, etc., and is not limited herein.
It should be noted that an end of the first communicating pipe 131 close to the first container 110 should extend into the first container 110 and be submerged below the liquid level of the first container 110. In this embodiment, the first container 110 may be a closed water tank, and the water tank is provided with a vent pipe 111 and an air inlet valve 113 disposed on the vent pipe 111. The air inlet valve 113 is opened, and the vent pipe 111 is used for communicating the water tank with the outside atmosphere; with the inlet valve 113 closed, the tank is closed and isolated from the atmosphere. Of course, in other alternative embodiments, the first container 110 may be a water tank, i.e. with an opening, and in this case the air pipe 111 and the air inlet valve 113 may be omitted, and the water tank may be connected to the outside atmosphere, as shown in fig. 3.
The volume of the first container 110 and the volume of the second container 120 are equal. Optionally, in this embodiment, each of the first container 110 and the second container 120 is a cube, a side length of the cube is 8cm, the first container 110 and the second container 120 are made of organic glass, and wall thicknesses of the first container 110 and the second container 120 are respectively greater than or equal to 1cm, so as to meet the strength requirement. Of course, the first container 110 and the second container 120 may be cylinders or other shapes, and are not limited thereto.
Further, a pressure sensor 155 is provided in the second container 120, and the pressure sensor 155 is used for detecting the pressure in the second container 120. In addition, the second container 120 is further provided with an exhaust valve 153, and the exhaust valve 153 is opened to enable the second container 120 to communicate with the external atmosphere, so that the internal and external air pressures of the second container 120 are balanced, and the pressure sensor 155 or the second container 120 itself is prevented from being damaged due to the fact that the second container 120 is in a vacuum state for a long time. It will be readily appreciated that a holder 121 is provided in the second container 120 for holding a sample to be tested. The second container 120 is further provided with a cover (not shown) that can be opened and closed to facilitate the insertion and removal of the sample to be tested.
The porosity measuring device 10 in the embodiment has the advantages of simple and compact structure, small volume and portability, and can be used for field soil sampling measurement in the field, and a sample is not required to be brought back to a laboratory for detection, so that the measurement period is shortened, and the measurement efficiency and the accuracy of the measurement result are improved. And the manufacturing cost is relatively low, the operability is strong, the operation does not need to depend on professional personnel, and the safety is high. In addition, the first communicating pipe 131 and the second communicating pipe 132 in this embodiment can be replaced and adjusted according to the type of the sample to be measured, and the device has a wide application range, is flexible to use, and has a great popularization and application value.
Second embodiment
The porosity measurement method provided in the embodiment of the present invention is applied to the porosity measurement device 10 in the foregoing embodiments, and is used for measuring the porosity of soil or other objects, where the sample to be measured in the embodiment takes soil as an example, and the method mainly includes the following steps:
first, a soil sample is collected.
Specifically, a shovel is used for planing the soil surface at the measuring place to form a platform. The cutting ring support is sleeved at the end, without the cutting edge, of the cutting ring, the cutting ring support handle is pressed firmly and balanced, the cutting ring is driven into the soil vertically and cannot shake, if the soil is hard, the cutting ring cannot be easily inserted into the soil, the cutting ring support handle can be slightly knocked by a soil hammer, and when the whole cutting ring is completely pressed into the soil and the soil surface is about to touch the top of the cutting ring support, the cutting ring can be peeped through a small hole in the cutting ring support cover, and the pressing is stopped. Digging out soil around the cutting ring by using an iron shovel, cutting off the soil below the cutting ring, and leaving some redundant soil below the cutting ring; taking out the cutting ring, turning over the cutting ring with the cutting edge facing upwards, scraping off the soil adhered to the outer wall of the cutting ring with a soil cutting knife, and cutting the soil from the edge to the middle part with the soil cutting knife to make the soil level with the cutting edge. And when the soil is leveled to the lower edge of the cutting ring, a layer of filter paper is padded on the cutting ring, and the lower cover is covered. And covering the top cover of the cutting ring, turning the cutting ring again to enable one end of the cutting edge covered with the top cover to face downwards, taking down the cutting ring support, flattening the soil surface without the cutting edge end, and covering the bottom cover. And finishing the collection of the soil sample.
Second, the porosity of the soil sample is measured.
Alternatively, the liquid in the first container 110 includes, but is not limited to, water, and the first container 110 may be filled with water in advance; the porosity measurement device 10 is placed on a smooth and flat surface or a bench surface to ensure that the water in the first container 110 does not overflow, so that the porosity measurement device 10 is in a balanced state to improve the measurement accuracy.
Before placing the sample to be tested, the tightness of the porosity measuring device 10 is tested. In detail, the first valve 151 is opened, the second valve 152 is closed, and the discharge valve 153 and the cap are closed, so that the second container 120 is in a closed state. The vacuum pump 140 is turned on to evacuate the second container 120, and the vacuum pump 140 is configured to control the pressure in the second container 120 to be a preset pressure, which can be detected by the pressure sensor 155. It should be understood that the preset pressure may be a pressure value at which the air pressure in the second container 120 reaches a stable value, or may be a pressure value set according to actual needs. In practice, after the vacuum pump 140 is turned on for a period of time, the pressure in the second container 120 is stabilized to a constant value, and the stabilized pressure value depends on the power of the vacuum pump 140, and is usually used as the preset pressure in the test. Subsequently, the first valve 151 is closed, and the second valve 152 and the air inlet valve 113 of the air vent pipe 111 on the first container 110 are opened, so that the first container 110 is communicated with the external atmosphere. The water level in the first container 110 is checked and a first level of liquid is recorded. Alternatively, if the water level reaches a stable level after rising to a certain height, the sealing performance of the device is proved to be good, and the volume value of the position of the liquid level after the water level is moved upwards is recorded as V1. It should be noted that, if the first container 110 is a water tank, the water level in the first container 110 can be checked only by opening the second valve 152 after closing the first valve 151. It is easily understood that the water level may rise into the first connection pipe 131 and also into the second connection pipe 132 depending on the preset pressure of the vacuum pump 140.
Placing a sample to be tested in the second container 120; placing the sample to be tested on the support 121 in the second container 120, closing the cover of the second container 120, closing the second valve 152 after the second container 120 is sealed, opening the first valve 151, starting the vacuum pump 140 to evacuate the second container 120, and closing the first valve 151 after the air pressure in the vacuum pump 140 is stabilized. The pressure here should reach a stable pressure value equal to the above-mentioned preset pressure. In this embodiment, the preset pressure may be a stable pressure value after the vacuum pump 140 works for a period of time.
Opening the second valve 152 again to communicate the first container 110 with the second container 120, and keeping the first container 110 in communication with the outside atmosphere, wherein the water level in the first container 110 rises due to the difference between the atmospheric pressures at the two sides of the first container 110 and the second container 120, and after the rising liquid level is stable, the volume value of the water level in the first container 110 after moving upwards is checked and recorded as V2, namely the second liquid level height of the liquid is recorded; and finally, calculating the volume V pore of the soil porosity according to a formula.
V pore ═ 100- (V1-V2))/100 × 100%.
Wherein 100 is the volume of the conventional cutting ring, and (V1-V2) represents the volume of all soil particles in the cutting ring, and (100- (V1-V2)) represents the volume of all soil pores in the cutting ring. Therefore, the porosity of the sample to be measured can be calculated by calculating the change of the liquid volume through the height change of the liquid level in the first container 110 and the known diameter of the communicating pipe 130, the operation method is simple, the dependence on professional operators is avoided, the measurement period is short, the measurement efficiency is high, and the safety in the measurement process is high. In addition, the porosity measuring device 10 is simple in structure, small in size, convenient to carry, flexible to use and more accurate and reliable in measuring result, and can be used for measuring in the field without bringing a sample back to a laboratory for measurement.
The contents of other parts not mentioned in this embodiment are similar to those described in the first embodiment, and are not described again here.
In summary, the embodiments of the present invention provide a porosity measurement apparatus 10 and a porosity measurement method, which have the following beneficial effects:
the porosity measuring device 10 is simple in structure, relatively low in manufacturing cost, small in size, convenient to carry, suitable for field measurement, wide in application range and high in flexibility. Besides being used for measuring the porosity of soil, the method can also be used for measuring the porosity of other objects. And repeated measurement can be carried out, and the service life is long.
The porosity measurement method is simple and convenient to operate, does not need to depend on operation of professionals, is high in operability and safety, can be applied indoors and outdoors, and is high in flexibility. And the measuring result is accurate and reliable, the measuring period is short, and the measuring efficiency is high.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A porosity measuring device is characterized by comprising a first container, a communicating pipe, a second container and a vacuum pump; the first container is filled with liquid, the first container is communicated with one end of the communicating pipe, the other end of the communicating pipe is communicated with the second container, the second container is used for placing a sample to be tested, and the vacuum pump is connected with the second container;
a first valve is arranged between the vacuum pump and the second container, and a second valve is arranged between the second container and the communicating pipe; the vacuum pump is used for controlling the pressure of the second container under the state that the first valve is opened and the second valve is closed.
2. The porosity measurement device according to claim 1, wherein the communication pipe includes a first communication pipe and a second communication pipe, one end of the first communication pipe communicates with the first container, the other end of the first communication pipe communicates with one end of the second communication pipe, and the other end of the second communication pipe communicates with the second container.
3. The porosity measurement device according to claim 2, wherein a diameter of the first communication pipe is larger than a diameter of the second communication pipe.
4. The porosity measurement device according to claim 3, wherein the first communication pipe has a diameter of 2 to 4cm, and the second communication pipe has a diameter of 0.5 to 1 cm.
5. The porosity measurement device according to claim 2, wherein the first communication pipe has a volume of 30ml to 50 ml.
6. The porosity measurement device according to claim 2, wherein the second communication pipe includes a first vertical section, a horizontal section, and a second vertical section, one end of the first vertical section communicates with the first communication pipe, the other end of the first vertical section communicates with one end of the horizontal section, the other end of the horizontal section communicates with one end of the second vertical section, and the other end of the second vertical section communicates with the second container.
7. The porosity measurement device of claim 6, wherein the first vertical segment has a volume of 10ml to 20 ml.
8. The porosity measurement device of claim 1, wherein the volume of the first reservoir and the volume of the second reservoir are equal.
9. A porosity measuring device according to any one of claims 1-8, wherein the second container is provided with a vent valve.
10. A porosity measurement method applied to the porosity measurement device according to any one of claims 1 to 9, comprising:
before a sample to be detected is placed, the first valve is opened, the second valve is closed, and the vacuum pump controls the pressure in the second container to be a preset pressure;
closing the first valve, opening the second valve, and recording a first liquid level of the liquid;
placing a sample to be tested in the second container;
opening the first valve, closing the second valve, opening the vacuum pump to control the pressure in the second container to be the preset pressure, and closing the first valve; opening the second valve and recording a second liquid level of the liquid;
and calculating the porosity of the sample to be detected according to the first liquid level height and the second liquid level height.
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| CN202011066083.6A CN112067528A (en) | 2020-09-30 | 2020-09-30 | Porosity measuring device and porosity measuring method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113029904A (en) * | 2021-03-09 | 2021-06-25 | 中国地质大学（武汉） | Soil porosity testing method based on thermodynamic equilibrium |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113029904A (en) * | 2021-03-09 | 2021-06-25 | 中国地质大学（武汉） | Soil porosity testing method based on thermodynamic equilibrium |
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