CN214668456U - Multi-channel mixed coal rock mass seepage test device - Google Patents

Abstract

The utility model discloses a mixed coal rock mass seepage flow test device of multichannel belongs to experimental technical field, including at least two sealed claddings that are used for placing the sample, sealed claddings have a lateral wall, diapire and roof, and wherein the lateral wall is seal structure, makes the lateral wall of sample sealed, and diapire and roof are ventilative structure to be provided with down the briquetting at the diapire lower extreme, be provided with the briquetting on the roof, the inlet channel that is used for making test gas get into sealed claddings and the outlet channel who is used for making test gas outflow sealed claddings are offered respectively to lower briquetting and last briquetting. The utility model discloses a series connection, parallelly connected, the series-parallel connection seepage flow of different infiltration routes to make sealed more thoroughly, stability is good, makes the test result more accurate, is applicable to all seepage flow tests.

Description

Multi-channel mixed coal rock mass seepage test device

Technical Field

The utility model belongs to the technical field of it is experimental, a rock mechanical properties test device is related to, specifically speaking are mixed coal rock mass seepage test device of multichannel.

Background

At present, for researching the seepage characteristics in the coal rock mass, the seepage tests which can be carried out are as follows: a seepage test in standard coal-rock mass seepage loading damage, a seepage test of a fractured coal-rock mass, and a coal-rock mass seepage test in a scattered state.

The test apparatus for the above test generally has certain drawbacks. Firstly, in the test device, the test sample is sealed by the rubber ring, once the sealing is not thorough, gas flows along the wall of the cylinder barrel, great errors are brought to test results, and the test accuracy is influenced. Secondly, the test device can not research the permeability characteristics of the coal-rock mass seepage channel under the conditions of series connection, parallel connection and series-parallel connection, and has certain limitation.

SUMMERY OF THE UTILITY MODEL

For solving exist among the prior art more than not enough, the utility model aims at providing a multichannel mixes coal rock mass seepage flow test device to reach and to study the permeability characteristic under series connection, parallelly connected and the series-parallel condition of coal rock mass seepage flow channel, and avoid sealed test error who does not thoroughly bring.

In order to achieve the above object, the utility model adopts the following technical scheme: the utility model provides a multichannel mixes coal rock mass seepage flow test device, includes at least two sealed claddings that are used for placing the sample, sealed claddings has lateral wall, diapire and roof, and wherein the lateral wall is seal structure, makes the lateral wall of sample is sealed, and diapire and roof are ventilative structure to be provided with down the briquetting at the diapire lower extreme, be provided with the briquetting on the roof upper end, lower briquetting and last briquetting are seted up respectively and are used for making test gas get into the inlet channel of sealed claddings and are used for making test gas flow out the outlet channel of sealed claddings.

As to the utility model limit: the number of the sealed enclosures is four.

As to the utility model limit: the side wall of each sealed cladding is made of high molecular polymer with the glass transition temperature of 50-100 ℃, and a primary heating cylinder is sleeved outside each sealed cladding.

As to the utility model limit: the primary heating cylinder comprises a tubular cylinder body, and a primary heating pipe is arranged in the wall of the cylinder body.

As to the utility model limit: the first-stage heating cylinder is sleeved outside the sealing cladding through the seepage main cylinder, the seepage main cylinder comprises a tubular cylinder body sleeved in the first-stage heating cylinder, two end parts of the tubular cylinder body extend outwards to form a flange for positioning the first-stage heating cylinder, and the first-stage heating cylinder is fixed between the two flanges of the seepage main cylinder.

As to the utility model limit: the lower pressing blocks are of an integrated structure and form a lower pressing plate covering the bottom walls of all the sealing cladding shells, and the lower pressing plate is connected with the seepage main cylinder through corresponding flanges of the seepage main cylinder.

As to the utility model limit: the upper pressing block seals the seepage main cylinder through the upper cover plate.

As to the utility model limit: a plurality of one-level heating jar all overlap and locate a dipolar heating jar in, dipolar heating jar includes the tubulose cylinder body, secondary heating pipe has been buried underground in the cylinder body wall.

Since the technical scheme is used, compared with the prior art, the utility model, the beneficial effect who gains lies in:

(1) the utility model discloses be provided with a plurality of sealed claddings that are used for placing the sample, be provided with a plurality of test passageways in testing arrangement promptly, realized the series connection seepage flow of different infiltration routes through the method of segmentation combination sample, through placing the sample at different test passageways, adopt the mode of four ways seepage flow master cylinder, realized the parallelly connected seepage flow of different infiltration routes, through the method that the single cylinder is established ties, the multi-cylinder is parallelly connected, realized the series-parallel seepage flow, can reflect the inhomogeneous medium seepage flow characteristic in the mixed coal petrography body more accurately;

(2) the utility model is provided with the sealing cladding with the side wall capable of melting at high temperature, and the primary heating cylinder is arranged outside the sealing cladding, so that the side wall of the sealing cladding can be melted, the series sample can be sealed, the gap between the sample and the seepage main cylinder can be sealed, the phenomenon of gas seepage along the wall is reduced, the sealing is more thorough, and the test result is more accurate; furthermore, a second-stage heating cylinder is arranged outside the first-stage heating cylinder, so that heat loss of the first-stage heating cylinder can be relieved, the sealing shell can be completely melted, and the stability is good.

To sum up, the utility model discloses a series connection, parallelly connected, the series-parallel connection seepage flow of different infiltration routes to make sealed more thoroughly, stability is good, makes the test result more accurate, is applicable to all coal petrography body seepage tests.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Fig. 1 is a schematic perspective view of a first embodiment of the present invention;

fig. 2 is a schematic perspective view of embodiment 1 of the present invention;

fig. 3 is a schematic view of the internal structure of embodiment 1 of the present invention;

fig. 4 is a cross-sectional view taken along line a-a of fig. 3 according to embodiment 1 of the present invention;

fig. 5 is a plan view of embodiment 1 of the present invention;

fig. 6 is a schematic structural view of a lower pressing plate in embodiment 1 of the present invention.

In the figure: 10-sealing cladding, 101-side wall, 102-bottom wall, 103-top wall, 20-seepage main cylinder, 30-primary heating cylinder, 40-primary heating pipe, 50-upper pressing block, 60-primary sealing ring, 70-air outlet channel, 80-upper cover plate, 90-secondary sealing ring, 100-lower pressing plate, 110-seepage main cylinder mounting hole, 120-tertiary sealing ring, 130-air inlet channel, 140-secondary heating cylinder, 150-secondary heating pipe, 160-fixed table base, 170-mounting plate, 180-standard sample and 190-multistage series sample.

Detailed Description

The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the multi-channel mixed coal rock mass seepage testing device described herein is a preferred embodiment, and is only used for illustrating and explaining the present invention, and does not constitute a limitation to the present invention.

The terms or positional relationships in the directions such as "up", "down", "left" and "right" according to the present invention are based on the positional relationships in the drawings of the present invention, and are only for convenience of description of the present invention and for simplification of description, and are not intended to be specific directions, specific directional structures and operations which the device or element to be indicated or implied must have, and therefore, are not to be construed as limitations to the protection of the present invention.

Embodiment multi-channel mixed coal rock mass seepage test device

In the embodiment, as shown in fig. 1 to 6, the multi-channel mixed coal rock mass seepage test device comprises at least two sealed cladding 10 for placing a sample, an air inlet channel 130 for allowing test gas to enter and an air outlet channel 70 for allowing the test gas to flow out are arranged outside the sealed cladding 10, and a pipeline is connected through the air inlet channel 130 and the air outlet channel 70 to perform a seepage test. The sealed enclosure 10 is provided with at least two sealed enclosures, and samples can be connected in series, in parallel or in series and in parallel according to needs. For ease of understanding, fig. 3 is a schematic view of a state in which the samples are placed in the apparatus in a series-parallel manner, wherein the total size of the multi-stage serial samples 190 corresponds to the size of the standard sample 180. In the present embodiment, four mutually parallel sealed enclosures 10 are provided, but of course, other numbers of sealed enclosures 10 may be provided as required.

The sealed enclosure 10 is a hollow cylindrical cavity structure, and includes a cylindrical side wall 101 having a sealed structure, the side wall 101 is made of a high molecular polymer with a glass transition temperature of 50-100 ℃, in this embodiment, the side wall 101 is made of a polylactic acid (PLA) material, so that the side wall 101 can be melted at a high temperature. Of course, other high molecular polymers with a glass transition temperature of 50 to 100 ℃ such as polyvinyl chloride (PVC) and celluloid cellulose may be used for the side wall 101. The lower opening of the side wall 101 is provided with a bottom wall 102, the upper opening of the side wall 101 is provided with a top wall 103, the bottom wall 102 and the top wall 103 are porous gas-permeable circular plate structures, the porous structures can dredge gas in an air inlet channel and an air outlet channel, so that the gas can pass through a sample more uniformly, the cross sections of the circular plate structures of the bottom wall 102 and the top wall 103 are adaptive to the inner wall of the side wall 101, so that the bottom wall 102 and the bottom wall 102 can be plugged into two ends of the side wall 101, and a cavity for containing the sample is formed.

And a seepage main cylinder 20 matched with the outer diameter of the sealing cladding 10 and a primary heating cylinder 30 matched with the outer diameter of the seepage main cylinder 20 are sleeved on the outer side of each sealing cladding 10 in sequence. The one-level heating cylinder 30 includes the tubulose cylinder body that forms by the concatenation of the ring form casing of two halves, and the cylinder body adopts the coefficient of heat conductivity lambda > 50W/M to make as the metal material of K, reserves the way through the one-level heating on the cylinder body inner wall and is provided with the one-level heating pipe 40 spirally ground, and the one-level heating pipe in this embodiment is the copper pipe. The seepage main cylinder 20 comprises a tubular main cylinder body sleeved in the primary heating cylinder 30, the upper end and the lower end of the main cylinder body both extend outwards along the diameter direction to form a flange for positioning the primary heating cylinder 30, so that the primary heating cylinder 30 is fixed between the upper flange and the lower flange of the seepage main cylinder 20, namely the primary heating cylinder 30 is sleeved outside the sealed enclosure 10 through the seepage main cylinder 20. During assembly, the primary heating pipe 10 is wound on the seepage main cylinder 20, and then the two semicircular annular shells are spliced and buckled on the seepage main cylinder 20. Of course, the primary heating cylinder 30 may be provided as an integral structure, a flange at the upper end of the seepage main cylinder 20 is omitted accordingly, and the primary heating cylinder 30 may be directly sleeved on the seepage main cylinder 20 from the upper portion during installation. The arrangement of the first-stage heating cylinder 30 can preheat and melt the side wall 101 of the sealed cladding 10, can seal the multistage series sample 190, can seal gaps among the multistage series sample 190, the standard sample 180 and the seepage main cylinder 20, reduces the phenomenon of gas seepage along the wall, and enables the sealing to be more thorough. The seepage main cylinder 20 is a main place for generating seepage phenomenon, the seepage main cylinder 20 is arranged to limit the seepage direction in the seepage process, so that seepage is along the axis direction of the main cylinder, the side wall 101 of the sealing cladding 10 which is prevented from being melted after heating is attached to the inner wall of the primary heating cylinder 30, after the test is completed, residues attached to the seepage main cylinder 20 can be cleaned, and the deformation of a sample can be limited.

In order to seal the upper end of the hermetic container 10, a cylindrical upper pressing block 50 is provided at the upper end of the top wall 103 of the hermetic container 10. The heights of the seepage main cylinder 20 and the primary heating cylinder 30 are greater than that of the sealing cladding 10, so that the sealing cladding 10 sleeved with the seepage main cylinder 20 and the primary heating cylinder 30 is concave, four sealing claddings 10 are arranged in the embodiment, accordingly, four upper pressing blocks 50 are correspondingly arranged and are respectively inserted into each concave structure, the upper end of each sealing cladding 10 is pressed by the corresponding upper pressing block 50, and the upper end of the inner wall of the seepage main cylinder 20 is provided with a primary sealing ring 60 for sealing between the seepage main cylinder 20 and the corresponding upper pressing block 50. In order to ensure the sealing effect, two primary sealing rings 60 are provided along the height direction of the seepage main cylinder 20. In order to evacuate the sample in the sealed enclosure 10 during the test, an air outlet channel 70 for letting the test gas out of the sealed enclosure 10 is opened in the upper pressure block 50. The height of the upper pressing block 50 in this embodiment is greater than the depth of the recess formed by the sealing cladding 10 and the seepage main cylinder 20, so that the upper pressing block 50 can still protrude from the surface of the recess after being inserted into the recess. Therefore, the gas outlet channel 70 in this embodiment includes a vertical channel disposed at the bottom of the upper pressing block 50 along the vertical direction, and a horizontal channel disposed along the horizontal direction and communicated with the vertical channel, so that the gas outlet channel 70 in the upper pressing block 50 is integrally in an inverted "L" shape, further, as shown in fig. 5, the dotted line in the figure is the disposition position of the gas outlet channel 70, and in order to facilitate the connection of the pipelines in the test process, the horizontal channels of the four gas outlet channels 70 in this embodiment all face the center of the test apparatus.

In order to further fix the seepage main cylinder 20 and the primary heating cylinder 30, an annular upper cover plate 80 is further arranged on the seepage main cylinder 20, the inner diameter of the upper cover plate 80 is equal to the outer diameter of the upper pressing block 50, when the seepage main cylinder 20 is used, the upper cover plate 80 penetrates through the upper pressing block 50, the upper cover plate 80, the flanges of the seepage main cylinder 20 and the primary heating cylinder 30 are sequentially connected through threaded connection, and a secondary sealing ring 90 is arranged between each upper cover plate 80 and the flange of each seepage main cylinder 20.

In order to seal the lower end of the sealed envelope 10, a lower pressing block is provided at the lower end of the bottom wall 102 of the sealed envelope 10, and the lower pressing block is structurally different from the upper pressing block 50 in order to distinguish the two ends of the test piece. In this embodiment, the four lower press blocks are an integral structure, forming a circular lower press plate 100 capable of covering all of the bottom wall 102 of the sealed enclosure 10. A plurality of seepage main cylinder mounting holes 110 are circumferentially distributed on the lower pressure plate 100 (for better clarity, the dotted line in fig. 6 is a schematic position of the seepage main cylinder 20), a flange at the lower end of each seepage main cylinder 20 is in threaded connection with the lower pressure plate 100 through the seepage main cylinder mounting holes 110, and a tertiary seal ring 120 is arranged between the flange at the lower end of each seepage main cylinder 20 and the lower pressure plate 100. In order to ventilate the test sample in the sealed enclosure 10 during the test, an air inlet channel 130 for allowing the test gas to enter the sealed enclosure 10 is opened on the lower pressure block. The air inlet passage 130 in this embodiment is a through hole formed in the lower pressure block and opposed to the sample position.

In order to alleviate the heat loss of the first-stage heating cylinders 30, two-stage heating cylinders 140 are sleeved outside the four first-stage heating cylinders 30. The second-stage heating cylinder 140 comprises a cylindrical cylinder body made of a metal material with a thermal conductivity coefficient lambda larger than 50W/M as K, a through hole for placing the four first-stage heating cylinders 30 is formed in the cylindrical cylinder body, a second-stage heating pipe 150 is embedded in the cylinder body wall through a second-stage heating reserved channel, and the second-stage heating pipe in the embodiment is a copper pipe. Wherein, the diameter of the lower press plate 100 is equal to the outer diameter of the secondary heating cylinder 140, so that the secondary heating cylinder 140 is connected with the lower press plate 100 through a screw connection.

In order to facilitate the gas to enter the sample through the lower pressure plate 100 during the experiment, a fixed base 160 is fixedly arranged at the lower end of the lower pressure plate 100. The main body of the fixed table base 160 is a circular ring structure with the outer diameter being the same as the diameter of the lower pressing plate 100, a circular mounting piece 170 is fixedly arranged on the upper end face of the main body structure in the circumferential direction, and a through hole is formed in the mounting piece 170, so that the fixed table base 160 is in threaded connection with the lower pressing plate 100 through the circular mounting piece 170.

Taking a series-parallel permeation test as an example, the test performed by using the embodiment mainly comprises the following steps:

preparing a sample: according to the test requirement, preparing a standard sample or a multi-stage series sample which is consistent with the size of the multi-channel mixed coal rock mass seepage test device, and for the convenience of understanding, fig. 3 is a schematic diagram of a state that the sample is placed in the device in a mixed connection mode, wherein the total size of the multi-stage series sample 190 is consistent with the size of the standard sample 180. This example was run in a series-parallel seepage test involving a multi-stage series sample and three standard samples.

Assembling: the sample is placed in a multi-channel mixed coal rock mass seepage test device in a series-parallel placing mode, in the embodiment, a series sample and three standard samples 180 are taken, the top wall 103 or the bottom wall 102 of the sealed cladding 10 is detached from the side wall 101, the corresponding samples are respectively placed in the corresponding sealed cladding 10, the detached top wall 103 or bottom wall 102 is placed into the side wall 101, the side wall 101 completely wraps the top wall 103, the sample and the bottom wall 102, and the multi-channel mixed coal rock mass seepage test device is assembled. Wherein, assemble the mixed coal rock mass seepage flow test device of multichannel and include following step:

the method comprises the following steps: respectively penetrating the spiral primary heating pipes 40 into each primary heating cylinder 30 through the primary heating reserved channel;

step two: sleeving the assembled primary heating cylinder 30 outside the seepage main cylinder 20, so that the primary heating cylinder 30 is fixed between an upper flange and a lower flange of the seepage main cylinder 20;

step three: a third-level sealing ring 120 is mounted on a flange at the lower end of the seepage main cylinder 20, and the flange at the lower end of the seepage main cylinder 20 is hermetically fixed on the lower pressure plate 100 by using a fixing bolt;

step four: the secondary heating pipe 150 is inserted into the secondary heating cylinder 140 through the secondary heating pipe pre-reserved passage, and the secondary heating cylinder 140 is installed and fixed on the lower pressing plate 100 by using a fixing bolt;

step five: placing the assembly obtained in the fourth step on a fixed table base 160, and connecting and fixing the assembly and the fixed table base by using bolts;

step six: installing a primary sealing ring 60 on the inner wall of the seepage main cylinder 20, and inserting an upper pressing block 50 into the concave structure of the seepage main cylinder 20;

step seven: placing a secondary sealing ring 90 on the flange of each seepage main cylinder 20, sealing each seepage channel by using an upper cover plate 80, and fixing the upper cover plate 80 by using bolts;

step eight: the test apparatus was placed on a press, and the press was used to apply pressure to the upper press block 50 to bring the components in the seepage master cylinder 20 into close contact.

Connecting: connecting the pipelines to the gas inlet channel 130 and the gas outlet channel 70 with the samples, and selecting a serial connection mode, a parallel connection mode or a parallel connection mode according to the test requirement; in the embodiment, a series-parallel seepage test is performed, the gas outlet channels 70 are respectively connected with gas outlet pipelines, and each gas outlet pipeline is provided with a flow meter and a press machine so as to measure the gas motion parameters of each channel; the gas outlet pipelines of each channel are connected in parallel by utilizing a five-way valve, even if the pipelines are connected and converged at the tail end, a flowmeter and a press machine are arranged on the converged pipelines to measure the total gas motion parameters, and the converged pipelines are connected into a gas extraction pump in a unified way; the air inlet channels 130 are respectively connected with air inlet pipelines, the air inlet pipelines of each channel are connected in parallel by utilizing the five-way valve, even if the pipelines are connected and converged end to end, and the converged pipelines are uniformly connected into a gas pressure environment to be tested.

Heating: and (3) connecting the corresponding first-stage heating pipe 40 and the corresponding secondary heating pipe 150 into a heating circuit, controlling the temperature of the corresponding first-stage heating cylinder 30, second-stage heating cylinder 140 and seepage main cylinder 20 to rise to 70-90 ℃, keeping for 30-60 min, melting the side wall 101 of the sealed cladding 10, sealing the gap of the side wall of the sample, closing the heating circuit, and cooling to room temperature. This step can also be performed after assembly and before joining.

And (3) testing: and (3) according to the set pressure of the test, starting the air pump to ventilate, reading the gas flow and pressure parameters of each channel and the total channel, closing the air pump and the five-way valve after the permeation is finished, and splitting the test device. The method mainly comprises the following steps of splitting a multi-channel mixed coal rock mass seepage test device:

the method comprises the following steps: disassembling the upper pressing block 50 and the upper cover plate 80, controlling the primary heating cylinder 30 and the secondary heating cylinder 140 by using the primary heating pipe 40 and the secondary heating pipe 150, heating the seepage main cylinder 20 to soften the side wall 101 of the sealing cladding 10, keeping the softened state, taking out the sample, and cleaning the sealing cladding 10 residue on the seepage main cylinder 20;

step two: and (3) closing the heating circuit, and after the sample is cooled to room temperature, sequentially detaching the fixed table base 160, the secondary heating cylinder 140, the primary heating cylinder 30 and the seepage main cylinder 20.

It should be noted that the primary heating pipe 40 and the secondary heating pipe 150 need to penetrate into each of the primary heating cylinder 30 and the secondary heating cylinder 140 only during the initial test, and the primary heating pipe 40 and the secondary heating pipe 150 need not to be disassembled after the initial test, and can be directly used during the next test.

The connection mode of the series-parallel connection refers to that at least one multistage series sample and at least one standard sample are connected in parallel, the series-parallel connection in the embodiment comprises one multistage series sample and three standard samples, the number of the series samples and the number of the standard samples can be adjusted according to needs in the test, for example, under the condition that four channels are arranged in the embodiment 1, two multistage series samples and two standard samples can be placed, and three multistage series samples and one standard sample can also be placed. Of course, it is also possible to place a multi-stage serial sample and a standard sample using only two or three of the four channels, to place a multi-stage serial sample and two standard samples, or to place at least one multi-stage serial sample and at least one standard sample in any other way. The same operation occurs when the total number of channels in the assay device is changed. When the connection mode is changed, the five-way valve is correspondingly adjusted to be a four-way valve, a three-way valve and other valves meeting the connection requirement.

The parallel connection mode refers to a connection mode of connecting at least two standard samples in parallel, the number of the standard samples can be adjusted according to needs in the test, for example, four standard samples can be placed under the condition of having four channels, or two or three parallel standard samples can be placed by only using two or three of the four channels. The same operation occurs when the total number of channels in the assay device is changed. When the connection mode is changed, the five-way valve is correspondingly adjusted to be a four-way valve, a three-way valve and other valves meeting the connection requirement.

The serial connection mode is a connection mode in which a multistage serial pattern is connected to a test apparatus, and a multistage serial sample may be placed in any one of the channels and tested for the channel. The number of the components of the multistage series connection sample and the thickness of each component can be adjusted as required, and the total size of the multistage series connection sample is consistent with that of the standard sample, so that the superimposed multistage series connection sample can be matched with a test device. The same operation occurs when the total number of channels in the assay device is changed.

It should be noted that the multichannel mixed coal rock mass seepage test device in the embodiment can be used for not only performing a gas seepage test but also performing a liquid seepage test, and has a wide application range.

Claims (8)

1. The multi-channel mixed coal rock mass seepage test device is characterized by comprising at least two sealed cladding shells for placing samples, wherein each sealed cladding shell is provided with a side wall, a bottom wall and a top wall, the side walls are of a sealing structure and enable the side walls of the samples to be sealed, the bottom walls and the top walls are of a ventilation structure, a lower pressing block is arranged at the lower end of the bottom walls, an upper pressing block is arranged at the upper end of the top walls, and an air inlet channel for enabling test gas to enter the sealed cladding shells and an air outlet channel for enabling the test gas to flow out of the sealed cladding shells are respectively formed in the lower pressing block and the upper pressing block.

2. The multi-channel mixed coal rock mass seepage test device according to claim 1, wherein four sealing cladding are arranged.

3. The multichannel mixed coal-rock mass seepage test device as claimed in claim 2, wherein the side wall of the sealed cladding is made of high-molecular polymer with the glass transition temperature of 50-100 ℃, and a primary heating cylinder is sleeved outside each sealed cladding.

4. The multi-channel mixed coal rock mass seepage test device according to claim 3, wherein the primary heating cylinder comprises a tubular cylinder body, and a primary heating pipe is arranged in the wall of the cylinder body.

5. The multi-channel mixed coal rock mass seepage test device according to claim 4, wherein the primary heating cylinder is sleeved outside the sealing cladding through a seepage main cylinder, the seepage main cylinder comprises a tubular cylinder body sleeved in the primary heating cylinder, two end parts of the tubular cylinder body extend outwards to form a flange for positioning the primary heating cylinder, and the primary heating cylinder is fixed between the two flanges of the seepage main cylinder.

6. The multi-channel mixed coal-rock mass seepage testing device of claim 5, wherein the plurality of lower pressing blocks are of an integrated structure and form a lower pressing plate covering the bottom wall of all the sealing cladding, and the lower pressing plate is connected with the seepage main cylinder through corresponding flanges of the seepage main cylinder.

7. The multi-channel mixed coal rock mass seepage test device according to claim 6, wherein the upper pressing block seals the seepage main cylinder through an upper cover plate.

8. The multichannel mixed coal-rock mass seepage test device of claim 7, wherein the plurality of primary heating cylinders are all sleeved in a secondary heating cylinder, the secondary heating cylinder comprises a tubular cylinder body, and a secondary heating pipe is buried in the wall of the cylinder body.

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