CN110687017B - Device and method for measuring gas migration characteristic and expansion force of buffer material - Google Patents
Device and method for measuring gas migration characteristic and expansion force of buffer material Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 236
- 238000002347 injection Methods 0.000 claims abstract description 124
- 239000007924 injection Substances 0.000 claims abstract description 124
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- 238000007789 sealing Methods 0.000 claims abstract description 29
- 239000000565 sealant Substances 0.000 claims abstract description 17
- 238000010521 absorption reaction Methods 0.000 claims abstract description 6
- 238000012806 monitoring device Methods 0.000 claims description 10
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 15
- 239000000741 silica gel Substances 0.000 abstract description 15
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- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 7
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
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Abstract
The invention discloses a device and a method for measuring gas migration characteristics and expansion force of a buffer material, and relates to the technical field of high-level waste disposal. The measuring device comprises a cylinder body, a hollow cavity for containing a sample is formed in the cylinder body, an annular water storage cavity is formed in the inner wall of the cylinder body at the hollow cavity section, and the water storage cavity is connected with a water injection device through a first water injection hole; and the inner wall of the hollow cavity section cylinder body is also provided with a sealant for sealing the boundary of the sample. The measuring device disclosed by the invention can be used for not only ensuring the tightness of the sample boundary by arranging the water storage cavity on the side wall of the cylinder body and increasing the adhesive force of the silica gel relative to the sample by injecting water and pressurizing in the water storage cavity so as to research the gas migration characteristic of the buffer material, but also measuring the expansion force generated by the water absorption expansion of the sample according to the variable quantity of the water pressure when the water in the water storage cavity is extruded by the water absorption expansion of the sample by arranging the water with the constant volume in the water storage cavity, and has complete functions and more accurate measuring results.
Description
Technical Field
The invention relates to the technical field of high-level waste disposal, in particular to a device and a method for measuring the gas migration characteristic and the expansion force of a buffer material in a high-level waste disposal warehouse.
Background
In recent years, as nuclear technology is widely used in various fields such as national defense, industry, agriculture, and medicine, radioactive wastes are increasingly disposed at high levels, and thus the problem of disposing radioactive nuclear wastes is becoming more serious.
For the disposal of high-level wastes, the current international society generally accepted feasible scheme is to bury the high-level wastes deeply in a stable stratum with the depth of 500-1000 m underground, i.e. the high-level wastes are solidified, filled and then stored in a deep geological disposal warehouse, so that the nuclear wastes are isolated from the living environment of human beings, and the pollution to the living environment of human beings is avoided. This disposal repository is commonly referred to as a "high level waste geological disposal repository", hereinafter simply referred to as a "disposal repository". The design concept of the disposal warehouse generally adopts a multi-barrier system, and comprises a surrounding rock geological barrier (such as granite, clay rock, salt rock and the like), an artificial barrier based on bentonite as a buffer material and a waste storage container barrier.
With the lapse of time, groundwater in the surrounding rock will erode gradually to the bentonite material from all around, and the bentonite will absorb water gradually and expand to fill up the space between the bentonite block and between bentonite block and the surrounding rock, thereby play the sealed effect. In the disposal room, due to the complicated physicochemical reaction, gases are generated, which mainly include: (1) hydrogen gas generated by corrosion of the waste storage container in bentonite and groundwater environments; (2) gases such as carbon dioxide, methane, nitrogen and the like generated by the decomposition of the microorganisms and the decay of organic matters; (3) hydrogen gas is generated by radiation (water, organic matter, etc.). The gas is mainly accumulated in the gap between the disposal tank and the buffer material, the gas pressure in the disposal warehouse is gradually increased along with the continuous generation of the gas, the accumulated gas can escape outwards, and the accumulated high gas pressure can have great influence on the stability and the safety of the whole disposal warehouse. Meanwhile, more importantly, the migration of gas may promote the migration of nuclides, and once the nuclides migrate into the biosphere, serious environmental disasters are caused. Therefore, the migration mechanism and law of the gas in the treatment reservoir barrier must be determined, and to investigate this problem, the migration path of the gas must first be determined. The possible paths for gas migration mainly include: migration from the inside of the surrounding rock; migrating from the buffer material; from the interface of the cushioning material with the surrounding rock.
However, when the buffer material migration characteristics are studied in a laboratory, the existing device cannot determine whether the gas migrates from the inside of the buffer material or from the contact surface between the buffer material and the device, which affects the study of the buffer material gas migration characteristics.
Therefore, in view of the above problems, it is necessary to provide an experimental apparatus capable of ensuring the migration of gas from the inside of the buffer material, so as to accurately study the migration characteristics of gas in the buffer material and provide theoretical support for deep geological treatment studies.
Disclosure of Invention
The device for measuring the gas migration characteristic and the expansion force of the buffer material comprises a cylinder body, wherein a hollow cavity for containing a sample is formed in the cylinder body, an annular water storage cavity is formed in the inner wall of the cylinder body at the hollow cavity section, and the water storage cavity is connected with a water injection device through a first water injection hole; and the inner wall of the hollow cavity section cylinder body is also provided with a sealant for sealing the boundary of the sample.
Preferably, the two ends of the cylinder body are respectively detachably and fixedly connected with an upper pressure head and a lower pressure head, the upper pressure head is formed with a gas injection hole, and the gas injection hole is connected with a gas transmission device; a through hole for outputting gas or injecting water is formed in the lower pressure head and is connected with a gas monitoring device or a water injection device; valves are respectively arranged in the gas injection hole, the through hole and the first water injection hole.
Preferably, the through holes are two and are respectively an air outlet used for being connected with a gas monitoring device and a second water injection hole used for being connected with a water injection device.
Preferably, the upper pressure head and the lower pressure head are respectively formed with a protruding part for fixing the vertical position of the sample, and the protruding parts are embedded into the hollow cavity of the cylinder body.
Preferably, the sealant is silica gel, and the height of the silica gel is greater than or equal to that of the sample.
Preferably, the sample is provided with water permeable devices for homogenizing gas/water at the upper and lower parts.
Preferably, the inner wall of the cylinder body is further provided with a sealing device for fixing the transverse position of the sample and matching with the protruding parts on the upper pressure head and the lower pressure head to seal the cylinder body, the height of the sealing device is consistent with the height of the cylinder body, and the sealant is arranged on one side of the sealing device close to the sample.
Preferably, the height and the setting position of the water storage cavity are matched with the sample, and the water storage cavity is opened towards one side of the sample and is isolated from the sample through a sealing device.
The invention also discloses a method for measuring the gas migration characteristic of the buffer material by using the measuring device, which comprises the following steps:
the method comprises the following steps: the cylinder body with the annular water storage cavity is prefabricated, and the sealing device and the sealant are attached to the inner wall of the cylinder body in sequence.
Step two: and putting the manufactured water permeable device and the sample into the hollow cavity of the cylinder body in sequence.
Step three: the upper pressure head and the lower pressure head are respectively fixed at two ends of the cylinder body through bolts, a formed gas injection hole in the upper pressure head is connected with a gas transmission device, a formed through hole in the lower pressure head is connected with a gas monitoring device, and a first water injection hole in the side wall of the cylinder body is connected with a water injection device.
Step four: and opening a valve in the first water injection hole, opening the water injection device, injecting water with the volume equal to that of the water storage cavity into the water storage cavity in a constant volume mode, and observing the water pressure at the moment through the water injection device after the target value is reached.
Step five: and opening a valve in the gas injection hole and a through hole connected with the gas monitoring device, opening the gas transmission device, gradually increasing the gas pressure of the gas injection hole from 0 to reach the target gas pressure required by the test, and opening the water injection device to increase the water pressure equivalent to the gas pressure through the first water injection hole in order to prevent the gas from escaping from the boundary when the required gas pressure is greater than the adhesive force between the sample and the sealant.
Step six: when the gas flow is monitored continuously at the gas outlet of the lower pressure head, the gas flow reaches a stable state at the moment, and the permeability of the sample at the moment can be measured.
The invention also discloses a method for measuring the expansion force of the buffer material by using the measuring device, which comprises the following steps:
the method comprises the following steps: the cylinder body with the annular water storage cavity is prefabricated, and the sealing device and the sealant are attached to the inner wall of the cylinder body in sequence.
Step two: and putting the manufactured water permeable device and the sample into the hollow cavity of the cylinder body in sequence.
Step three: the upper pressure head and the lower pressure head are respectively fixed at two ends of the cylinder body through bolts, the through hole formed in the lower pressure head is connected with the water injection device, and the first water injection hole in the side wall of the cylinder body is connected with the water injection device.
Step four: and opening a valve in the first water injection hole, opening a water injection device connected with the first water injection hole, injecting water with the volume equal to that of the water storage cavity into the water storage cavity in a constant volume mode, and observing the water pressure at the moment through the water injection device after the target value is reached.
Step five: the water injection device connected with the first water injection hole is kept in a constant volume mode, the water quantity in the water injection device is not changed any more, the valve of the through hole connected with the water injection device is opened at the moment, the water injection device connected with the through hole is opened, and water injection treatment is carried out on the sample through the through hole in the lower pressure head.
Step six: the sample absorbs water and expands and extrudes the water in the water storage cavity, but because the water injection device connected with the first water injection hole is in a constant volume mode at the moment, the set water amount can not change, namely, the water is not injected into the water storage cavity, and the water can not be discharged from the water injection device due to the extrusion of the sample, so that the pressure on the water injection device can change at the moment, and the pressure change amount is the expansion force generated due to the water absorption and expansion of the sample.
Compared with the prior art, the device for measuring the gas migration characteristic and the expansion force of the buffer material disclosed by the invention has the advantages that:
(1) the device can realize the research of the gas migration characteristic of the buffer material and can also realize the measurement of the expansion force of the buffer material.
(2) According to the device, the water storage cavity is formed in the side wall of the cylinder body, water is injected into the water storage cavity for pressurization, the adhesion force of silica gel relative to the sample is increased, so that the absolute sealing performance of the sample boundary is guaranteed, gas in the test is enabled to migrate from the inside of the sample, the gas does not escape from the sample boundary, and the accuracy of the research on the gas migration characteristic of the sample is improved.
(3) The device is through setting up the water of invariable volume in the water storage intracavity, uses the water injection device that can measure hydraulic, when the sample absorbs water the expansion extrusion water storage intracavity water, records the pressure variation on the water injection device, can reachs the expansive force that the sample expansion of absorbing water produced, has improved measurement structure's accuracy.
Drawings
For a clearer explanation of the embodiments or technical solutions of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for a person skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a structural view of example 1.
FIG. 2 is a structural view of embodiment 2.
The part names represented by the numbers or letters in the drawings are:
1-a bolt; 2-cylinder body; 3-a first water injection hole; 4-sample; 5-a water permeable device; 6-gas injection hole; 7-a through hole; 71-a second water injection hole; 72-air outlet holes; 8-upper pressure head; 9-a water storage cavity; 10-sealing glue; 11-sealing means; 12-lower ram.
Detailed Description
The following provides a brief description of embodiments of the present invention with reference to the accompanying drawings. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art based on the embodiments of the present invention without any inventive work belong to the protection scope of the present invention.
Fig. 1-2 show preferred embodiments of the invention, which are each parsed in detail from different perspectives.
Example 1
As shown in figure 1, the device for measuring the gas migration characteristic and the expansion force of the buffer material comprises a cylinder body 2, a hollow cavity for containing a sample 4 is formed in the cylinder body 2, an annular water storage cavity 9 is formed in the inner wall of the hollow cavity section cylinder body 2, and the water storage cavity 9 is connected with a water injection device through a first water injection hole 3. The inner wall of the hollow cavity section cylinder body 2 is also provided with a sealant 10. Specifically, the sealant 10 is not limited to be selected, and may produce a large adhesion force to the sample 4, and is preferably silica gel. The height of the silica gel is greater than or equal to that of the sample 4, and the silica gel is used for sealing the circumferential boundary position of the sample 4 and preventing gas smaller than the adhesion force of the silica gel from migrating from the boundary of the sample. The valve is connected between the first water injection hole 3 and the water injection device and used for controlling the connection of the water injection device and the first water injection hole 3, the water injection device has a constant pressure and constant volume mode, and the volume and the pressure of water in the water storage cavity can be controlled.
Furthermore, the two ends of the cylinder body 2 are respectively detachably and fixedly connected with an upper pressure head 8 and a lower pressure head 12, the upper pressure head 8 is formed with a gas injection hole 6, and the gas injection hole 6 is connected with a gas transmission device. And a through hole 7 for outputting gas or injecting water is formed in the lower pressure head 12, and the through hole 7 is connected with a gas monitoring device or a water injection device. Valves are respectively arranged in the gas injection hole 6, the through hole 7 and the first water injection hole 3. Specifically, the upper pressing head 8 and the lower pressing head 12 are respectively formed with a protrusion for fixing the vertical position of the sample 4, and the protrusion is embedded into the hollow cavity of the cylinder body 2.
Furthermore, the sample 4 is provided with water permeable devices 5 for homogenizing gas/water, specifically, the water permeable devices 5 are permeable stones. When the setting of water permeability device 5 was surveyed the bulging force in order to prevent to carry out the water injection to sample 4, the soil body was glued and is glued gas injection hole 6 on the pressure head 8, goes down through-hole 7 on the pressure head 12, plugs up gas injection hole 6 and through-hole 7. At the same time, the water-permeable device 5 is arranged to allow gas or water to enter the sample 4 uniformly, rather than only a little in the middle.
Further, the inner wall of the cylinder body 2 is also provided with a sealing device 11 which is used for fixing the transverse position of the sample 4 and is matched with the protruding parts on the upper pressure head 8 and the lower pressure head 12 to seal the cylinder body 2, the height of the sealing device 11 is consistent with that of the cylinder body 2, and the sealant 10 is arranged on one side of the sealing device 11 close to the sample 4. In particular, the sealing means 11 is a high performance fluoro-rubber. The sealing device 11 is arranged to isolate the sample 4 from water, and to fix the placing position of the sample 4 horizontally, so as to prevent the sample 4 from moving in the cylinder 2 due to the water storage cavity 9.
Further, the height and the setting position of the water storage cavity 9 are matched with those of the sample 4, and the water storage cavity 9 is opened towards one side of the sample 4 and is isolated from the sample 4 through a sealing device 11. The water storage cavity 9 is a circular cavity, and when the gas injection pressure is increased, the circular pressure can be uniformly applied to the sample 4. When carrying out the water injection to sample 4, because bentonite water absorption expansion can cause the extrusion to water, lead to water to outwards export a pressure, this pressure is the bulging force promptly, can measure through the pressure that the water injection device produced under the unchangeable circumstances of water volume and obtain, this water injection device's concrete structure and principle are prior art, do not describe here any more.
Example 2
As shown in fig. 2, the rest is the same as embodiment 1 except that:
the number of the through holes 7 is two, and the through holes are respectively an air outlet hole 72 for connecting a gas monitoring device and a second water injection hole 71 for connecting a water injection device.
In the test process, the lower end permeable stone is installed firstly, then the sample 4 is placed at the middle position, then the upper end permeable stone is placed, and the silica gel has an acting force F to the silica gel due to the fact that the silica gel is extruded by the permeable stone1At this time, the purpose of sealing the two sides of the permeable stone is achieved. And because the side wall of the cylinder body 2 of the part of the sample 4 is provided with the water storage cavity 9, the force of silica gel on the sample is smaller than F1Is set to F2In order to ensure the same sealing effect, water which is equal to the space of the water storage cavity 9 is injected into the water storage cavity 9 through the first water injection hole 3 to obtain F2＝F1. Starting to inject gas to study the migration characteristics of the gas in the buffer material, when the injected gas pressure is less than F1In the case of silica gel adhesion to the sample 4, the interface is sealed, and the gas can only migrate from the inside of the sample 4, when the injected gas pressure is greater than F1The water pressure equal to the air pressure can be applied to the water storage cavity 9 through the first water injection hole 3 in the same ratio, so that the pressure of the water storage cavity 9 is still greater than the air pressure, the effectiveness of silica gel adhesion is ensured, the migration characteristic of the air in the test under various air pressures can be researched, and meanwhile, the water quantity is increased according to the added water quantityThe deformation of the sample 4 can be determined.
A method for measuring the gas migration characteristic of the buffer material by using the measuring device comprises the following steps:
the method comprises the following steps: prefabricating the cylinder body 2 with the annular water storage cavity 9, and sequentially attaching the sealing device 11 and the sealant 10 to the inner wall of the cylinder body 2.
Step two: the prepared permeable stone and the sample 4 are sequentially placed in the hollow cavity of the cylinder body 2.
Step three: an upper pressure head 8 and a lower pressure head 12 are respectively fixed at two ends of a cylinder body 2 through bolts 1, a formed gas injection hole 6 in the upper pressure head 8 is connected with a gas transmission device, a formed through hole 7 in the lower pressure head 12 is connected with a gas monitoring device, and a first water injection hole 3 in the side wall of the cylinder body 2 is connected with a water injection device.
Step four: the valve in the first water injection hole 3 is opened, the water injection device is opened, water with the volume equal to that of the water storage cavity 9 is injected into the water storage cavity 9 in a constant volume mode, and after the target value is reached, the water pressure at the moment is observed through the water injection device.
Step five: and opening valves in the gas injection hole 6 and a through hole 7 connected with the gas monitoring device, starting the gas transmission device, gradually increasing the gas pressure of the gas injection hole 6 from 0 to reach the target gas pressure required by the test, and starting the water injection device to increase the water pressure equivalent to the gas pressure through the first water injection hole 3 in order to prevent the gas from escaping from the boundary when the required gas pressure is greater than the adhesion force between the sample 4 and the sealant 10.
Step six: when the continuous gas flow is monitored at the gas outlet 72 of the lower pressure head 12, the gas flow reaches a steady state at this time, and the permeability of the sample 4 at this time can be measured.
A method for measuring the expansion force of the buffer material by using the measuring device comprises the following steps:
the method comprises the following steps: prefabricating the cylinder body 2 with the annular water storage cavity 9, and sequentially attaching the sealing device 11 and the sealant 10 to the inner wall of the cylinder body 2.
Step two: the prepared permeable stone and the sample 4 are sequentially placed in the hollow cavity of the cylinder body 2.
Step three: the upper pressure head 8 and the lower pressure head 12 are respectively fixed at two ends of the cylinder body 2 through bolts 1, the through hole 7 formed in the lower pressure head 12 is connected with a water injection device, and the first water injection hole 3 in the side wall of the cylinder body 2 is connected with the water injection device.
Step four: the valve in the first water injection hole 3 is opened, the water injection device connected with the first water injection hole 3 is opened, water with the volume equal to that of the water storage cavity 9 is injected into the water storage cavity 9 in a constant volume mode, and after the target value is reached, the water pressure at the moment is observed through the water injection device.
Step five: the water injection device connected with the first water injection hole 3 is kept in a constant volume mode, the water amount in the water injection device is not changed any more, the valve of the through hole 7 connected with the water injection device is opened at the moment, the water injection device connected with the through hole 7 is opened, and the water injection treatment is carried out on the sample 4 through the through hole 7 on the lower pressure head 12.
Step six: sample 4 absorbs water and expands and extrudes the water in water storage cavity 9, but because the water injection device who is connected with first water injection hole 3 this moment is in invariable volume mode, its settlement water yield can not change, neither to water storage cavity 9 internal water injection promptly, also can not be because of the extrusion of sample 4 and locate the play water to the water injection device, then the pressure on the water injection device this moment can change, and this pressure variation is promptly because the expansive force that sample 4 absorbs water and expands the production.
In summary, the device and the method for measuring the gas migration characteristic and the expansion force of the buffer material disclosed by the invention can realize the research on the gas migration characteristic of the buffer material and the measurement on the expansion force of the buffer material. According to the device, the water storage cavity is formed in the side wall of the cylinder body, water is injected into the water storage cavity for pressurization, the adhesion force of silica gel relative to the sample is increased, so that the absolute sealing performance of the sample boundary is guaranteed, gas in the test is enabled to migrate from the inside of the sample, the gas does not escape from the sample boundary, and the accuracy of the research on the gas migration characteristic of the sample is improved. Simultaneously, the device is through setting up the water of invariable volume in the water storage chamber, uses the water injection device that can measure hydraulic pressure, when the sample absorbs water the expansion extrusion water storage intracavity water, records the pressure variation on the water injection device, can reachs the bulging force that the sample expansion of absorbing water produced, has improved the accuracy of measuring the structure.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. The method for measuring the expansion force of the buffer material is characterized in that the device comprises a cylinder body (2), a hollow cavity for containing a sample (4) is formed in the cylinder body (2), an annular water storage cavity (9) is formed in the inner wall of the cylinder body (2) at the hollow cavity section, and the water storage cavity (9) is connected with a water injection device through a first water injection hole (3); the inner wall of the hollow cavity section cylinder body (2) is also provided with a sealant (10) for sealing the boundary of the sample (4); an upper pressure head (8) and a lower pressure head (12) are detachably and fixedly connected to two ends of the cylinder body (2) respectively, a gas injection hole (6) is formed in the upper pressure head (8), and the gas injection hole (6) is connected with a gas transmission device; a through hole (7) for outputting gas or injecting water is formed in the lower pressure head (12), and the through hole (7) is connected with a gas monitoring device or a water injection device; valves are respectively arranged in the gas injection hole (6), the through hole (7) and the first water injection hole (3);
the method comprises the following steps:
the method comprises the following steps: prefabricating a cylinder body (2) with an annular water storage cavity (9), and sequentially attaching a sealing device (11) and sealant (10) to the inner wall of the cylinder body (2);
step two: putting the prepared water permeable device (5) and the sample (4) into a hollow cavity of the cylinder body (2) in sequence;
step three: an upper pressure head (8) and a lower pressure head (12) are respectively fixed at two ends of a cylinder body (2) through bolts (1), a through hole (7) formed in the lower pressure head (12) is connected with a water injection device, and a first water injection hole (3) in the side wall of the cylinder body (2) is connected with the water injection device;
step four: opening a valve in the first water injection hole (3), opening a water injection device connected with the first water injection hole (3), injecting water with the volume equal to that of the water storage cavity (9) into the water storage cavity (9) in a constant volume mode, and observing the water pressure at the moment through the water injection device after a target value is reached;
step five: keeping a water injection device connected with the first water injection hole (3) in a constant volume mode, enabling the water amount in the water injection device not to change any more, opening a valve of a through hole (7) connected with the water injection device at the moment, opening the water injection device connected with the through hole (7), and performing water injection treatment on the sample (4) through the through hole (7) on the lower pressure head (12);
step six: sample (4) water absorption expansion and the water in the extrusion water storage chamber (9), nevertheless because the water injection device who is connected with first water injection hole (3) this moment is in invariable volume mode, it sets for the water yield and can not change, neither to water storage chamber (9) internal water injection promptly, also can not be because the extrusion of sample (4) and locate out water to the water injection device, then the pressure on the water injection device of being connected with first water injection hole (3) this moment can change, and this pressure variation is promptly because the expansive force that sample (4) water absorption expansion produced.
2. The method for determining the expansion force of a cushioning material according to claim 1, wherein the number of said through holes (7) is two, respectively an outlet hole (72) for connecting to a gas monitoring device and a second water injection hole (71) for connecting to a water injection device.
3. The method for determining the expansion force of a cushioning material according to claim 2, characterized in that the upper ram (8) and the lower ram (12) are respectively formed with a protrusion for fixing the vertical position of the test specimen (4), said protrusion being embedded in the hollow cavity of the cylinder (2).
4. The method for determining the swelling force of a buffer material according to claim 1, wherein the sealant (10) is a silicone gel having a height equal to or greater than the height of the sample (4).
5. The method for determining the expansion force of a buffer material according to claim 1, characterised in that the sample (4) is provided with water permeable means (5) for homogenizing gas/water both above and below.
6. The method for measuring the expansion force of a buffer material according to claim 1, wherein the inner wall of the cylinder (2) is further provided with a sealing device (11) for fixing the transverse position of the sample (4) and matching with the bulges on the upper pressure head (8) and the lower pressure head (12) to seal the cylinder (2), the height of the sealing device (11) is consistent with the height of the cylinder (2), and the sealant (10) is arranged on one side of the sealing device (11) close to the sample (4).
7. The method for determining the expansion force of a buffer material according to claim 6, wherein the water storage cavity (9) is matched with the sample (4) in height and arrangement position, and the water storage cavity (9) is opened towards one side of the sample (4) and is isolated from the sample (4) through a sealing device (11).
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