CN108414417B - Fluid migration test system for simulating porous medium rock mass permeation channel - Google Patents
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- 238000012360 testing method Methods 0.000 title claims abstract description 58
- 239000011435 rock Substances 0.000 title claims abstract description 36
- 239000012530 fluid Substances 0.000 title claims abstract description 24
- 230000005012 migration Effects 0.000 title claims abstract description 18
- 238000013508 migration Methods 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 158
- 238000006073 displacement reaction Methods 0.000 claims abstract description 16
- 230000035515 penetration Effects 0.000 claims abstract description 16
- 238000004088 simulation Methods 0.000 claims abstract description 16
- 239000011148 porous material Substances 0.000 claims abstract description 11
- 230000008595 infiltration Effects 0.000 claims description 10
- 238000001764 infiltration Methods 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 8
- 238000010276 construction Methods 0.000 claims description 4
- 230000035699 permeability Effects 0.000 claims description 3
- 238000011160 research Methods 0.000 abstract description 11
- 230000009471 action Effects 0.000 abstract description 6
- 238000005065 mining Methods 0.000 abstract description 6
- 239000003245 coal Substances 0.000 description 11
- 239000000463 material Substances 0.000 description 8
- 230000008901 benefit Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
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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
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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Abstract
The invention discloses a fluid migration test system for simulating a porous medium rock mass permeation channel, and belongs to the technical field of mining engineering simulation tests. The test device comprises a test device, a hydraulic pressure and water quantity double-control servo device, a displacement pressure double-control servo device and a data acquisition device, wherein a water inlet loading head, a water outlet loading head, a first cavity, a second cavity and a penetration assembly are arranged in a test chamber of the test device, the penetration assembly comprises a plurality of penetration pipes, a water flow switch, a flow sensor and a pore water pressure sensor are arranged in each penetration pipe, connecting pipe orifices are distributed on the first cavity and the second cavity, and the first cavity and the second cavity are connected in a matched mode through the penetration pipes and the connecting pipe orifices. The invention quantitatively researches the fluid migration characteristics of porous medium rock masses in the permeation channel under the combined action of water pressure and mine pressure in different simulated geological environments to obtain the parameter characteristics of the fluid flow, the water pressure and the like of cracks in the rock masses under the influence of different external factors.
Description
Technical Field
The invention relates to the technical field of mining engineering simulation tests, in particular to a test system for simulating porous medium rock mass permeation channel fluid migration.
Background
In mine water damage, a crack seepage channel in a porous medium rock body becomes an important water inrush channel causing a coal mine, and rock body crack seepage and water inrush types are various and difficult to detect, so that the crack seepage and water inrush channel becomes a major problem in the aspect of water prevention and control of the coal mine nowadays. According to incomplete statistics, the economic loss caused by water penetration accidents in coal mines is up to 300 billions of yuan in the past 20 years. At present, the coal reserves threatened by water reach more than 100 hundred million tons, particularly, a plurality of local coal mines are leftover coal for mining national and international coal mines, the mining conditions are more complicated, and the adverse factors of water inrush caused by rock mass seepage are more prominent.
In order to ensure the safe exploitation of coal resources, get rid of the serious troubles of water inrush disasters, prevent water inrush accidents from happening when coal is mined under and on water, scientifically and reasonably design a stope layout mode, perform a porous medium rock mass permeation channel fluid migration test, and obtain the dynamic change characteristics of the porous medium rock mass under the combined action of water pressure and mine pressure, the method is one of the key problems to be solved urgently. Due to the characteristic of concealment of underground excavation engineering, the mechanism research and the influence factors of water inrush caused by coal mining are difficult to research by means of field observation, and indoor tests become an effective means for solving the problem.
Disclosure of Invention
The invention aims to provide a test system for simulating the fluid migration of a porous medium rock mass permeation channel, which is used for quantitatively researching the fluid migration characteristics of the porous medium rock mass in the permeation channel under the combined action of water pressure and mine pressure in different simulated geological environments to obtain the parameter characteristics of the fluid flow, the water pressure and the like of cracks in the rock mass under the influence of different external factors, and provides certain theoretical support for field measurement by carrying out research through indoor observation.
In order to achieve the above purpose, the technical problems to be solved by the present invention are: quantitatively analyzing the solid-fluid coupling mechanical characteristics of rock masses under the combined action of water pressure and ore pressure, wherein the solid-fluid coupling mechanical characteristics are shown by permeation channels with different porosities and different quantities; under the action of different loading pressures and water pressures, the rock blocks with different gradation have creep deformation, rheological behavior and compactness characteristics under the condition of a specific seepage channel; the water flow and water pressure distribution conditions in the cracks in the medium rock mass in different areas; the sand and water bursting research of the loose sand-containing layer rock mass in a special working environment.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the utility model provides a simulation porous medium rock mass infiltration passageway fluid migration test system, its includes test device, the two accuse servo device of water pressure water yield, the two accuse servo device of displacement pressure and data acquisition device, test device includes rigid base and is located test bench on the rigid base, the test bench is square frame construction, the space in the square frame construction forms the test chamber, its characterized in that:
a water inlet loading head, a water outlet loading head, a first cavity, a second cavity and a penetration assembly are arranged in the test chamber, a first loading hydraulic cylinder and a second loading hydraulic cylinder are respectively arranged on two sides of the test chamber, a plunger end of the first loading hydraulic cylinder is connected with the water inlet loading head, the other end of the water inlet loading head is connected with the first cavity, the first cavity is connected with the second cavity through the penetration assembly, the other end of the second cavity is connected with the water outlet loading head, and a plunger end of the second loading hydraulic cylinder is connected with the water outlet loading head through a connecting rod;
the infiltration assembly comprises a plurality of infiltration pipes which are arranged in parallel, a water flow switch, a flow sensor and a pore water pressure sensor are arranged in each infiltration pipe, a plurality of connecting pipe orifices are distributed on the first cavity and the second cavity, and the first cavity and the second cavity are connected in a matched mode through the infiltration pipes and the connecting pipe orifices;
the water inlet loading head is connected with the water pressure and water quantity double-control servo device through a water inlet pipeline;
the first loading hydraulic cylinder is connected with the displacement pressure double-control servo device;
the data acquisition device is respectively connected with the water pressure and water quantity double-control servo device, the displacement pressure double-control servo device, the flow sensor and the pore water pressure sensor through signals;
the water outlet loading head comprises a water outlet loading head body, a diameter-variable water outlet hole, a connecting rod and a sealing rubber layer positioned on the periphery of the water outlet loading head body, and the water outlet loading head is connected with the second loading hydraulic cylinder through the connecting rod.
The beneficial technical effects directly brought by the technical scheme are as follows: because quantitative and regional analysis of cracks in a rock body cannot be realized in the previous research on rock seepage, the device can only be used for qualitative research in the aspect of macroscopical aspect, the number and the flux of the permeation tubes in a specific region are changed by using a tool, and the research on the solid-fluid coupling mechanics problem of the rock body under the combined action of water pressure and mine pressure in permeation channels with different porosities and different numbers can be carried out.
As a preferable scheme of the present invention, the water inlet loading head includes a cylindrical barrel, a cylindrical cavity is formed in the barrel, a water permeable hole is formed in a side wall of the cylindrical barrel, a water inlet valve is formed on the cylindrical barrel, and the water inlet loading head is connected to the water inlet pipeline.
As another preferable aspect of the present invention, arc-shaped pressing members are respectively disposed on the first cavity and the second cavity, and both end portions of the arc-shaped pressing members are connected to rigid brackets, and are fixed to the rigid brackets by bolts in a fitting manner.
Preferably, the water outlet end of the water inlet loading head is a circular plate, the circle center of the circular plate outwards defines a plurality of concentric circles, and a plurality of water permeable holes are arranged on the circumferences of the concentric circles at equal intervals.
The beneficial technical effects brought by the invention are as follows:
compared with the prior art, the test system for simulating the fluid migration of the porous medium rock mass permeation channel has the following characteristics and advantages:
the invention relates to a test system for simulating the migration of a porous medium rock mass permeation channel fluid, which is used for carrying out a crack seepage simulation test in a porous medium in a geological environment, realizes the simulation of different stresses and different water pressures by using a water inlet loading head and a water outlet loading head in a device, completes the implementation of graded loading, realizes the simulation of the porosity and the circulation rate of different rock mass regions by using a permeation tube in the device, further researches the flow characteristics of the crack rock mass fluid under the conditions of different stresses, water pressures, different porosities and the like, sets different stress and water pressure by using a displacement pressure double-control servo device and a water pressure and water quantity double-control servo device, puts simulation materials into a first cavity and a second cavity based on the actual geological environment, quantitatively researches various geological information of the crack seepage in the porous medium, and obtains the mutual influence change curve among parameters such as the water pressure, the flow and the like in the cracks at different positions, obtaining the migration rule of fluid in the porous medium, thereby improving the reliability of surrounding rock water inrush characteristic identification induced by coal mining; the simulation test system is provided with a pressure stabilizing system with independent water pressure and load, so that the simulation test system is more accurate and has better stability; and corresponding monitoring software can be matched, so that the real-time monitoring on the pore water pressure, flow and displacement information is realized.
The features and advantages of the present invention will become more apparent from the detailed description of the invention when taken in conjunction with the drawings.
Drawings
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a schematic structural diagram of a test system for simulating porous medium rock mass permeability channel fluid migration according to the invention;
FIG. 2 is a top view of the bottom end of the first chamber of the present invention;
FIG. 3 is a cross-sectional view of a water inlet loading head according to the present invention;
FIG. 4 is a schematic structural view of a permeable member according to the present invention;
FIG. 5 is a cross-sectional view of the water loading head of the present invention;
FIG. 6 is a cross-sectional view of a variable diameter outlet orifice in the outlet loading head of the present invention;
the device comprises a rigid base 11, a rigid base 12, a test bed 13, a fastening bolt 21, a first cavity 211, a connecting pipe orifice 22, a second cavity 23, a permeation pipe 231, a water flow switch 24, an arc-shaped pressing part 31, a water inlet loading head 311, a water permeable hole 312, a cavity 313, sealing rubber 32, a water outlet loading head 321, a diameter-variable water outlet hole 322, a connecting rod 323, sealing rubber 33, a loading hydraulic cylinder 41, a displacement pressure double-control servo device 42, a water pressure and water quantity double-control servo device 5, a data acquisition device 6, a pore water pressure sensor 7, a flow sensor 8 and a water inlet valve.
Detailed Description
The invention provides a test system for simulating the fluid migration of a porous medium rock mass permeation channel, and in order to make the advantages and technical scheme of the invention clearer and clearer, the invention is described in detail with reference to specific embodiments.
As shown in figure 1, the test system for simulating porous medium rock mass permeation channel fluid migration comprises a test device, a hydraulic pressure and water quantity double-control servo device 42, a displacement pressure double-control servo device 41 and a data acquisition device 5, wherein the test device comprises a rigid base 11 and a test bed 12 positioned on the rigid base 11, the test bed is of a square frame structure, and a test chamber is formed in the space in the square frame structure.
As a main improvement point of the present invention, a water inlet loading head, a water outlet loading head, a first cavity, a second cavity and a permeation component are arranged in the test chamber, wherein, as shown in fig. 3, the whole structure of the water inlet loading head 31 is preferably a column, the interior of the water inlet loading head is a column-shaped cavity, a water permeable hole 311 is arranged on the side wall of the cavity 312, a sealing rubber 313 is arranged outside the water inlet loading head 31, the water inlet loading head 31 is connected with a water inlet pipeline, and a water inlet valve 8 and a flow sensor 7 are arranged on the water inlet pipeline. The sealing rubber layer is preferably made of epoxy resin material with good sealing performance.
The specific structure of the water outlet loading head is shown in fig. 5 and 6, a variable-diameter water outlet hole 321 is formed in the water outlet loading head 32, a sealing rubber 323 is arranged outside the water outlet loading head 32, and the water outlet loading head 32 and the loading hydraulic cylinder 33 (second loading hydraulic cylinder) are connected through a connecting rod 322.
The first cavity 21 and the second cavity 22 are connected through a penetration assembly, the structure of the specific penetration assembly is combined with that shown in fig. 1 and fig. 4, the penetration assembly comprises a plurality of penetration pipes 23 which are arranged in parallel, a water flow switch 231, a flow sensor 7 and a pore water pressure sensor 6 are arranged in each penetration pipe 23, as shown in fig. 2, a plurality of connecting pipe orifices 211 are distributed on the first cavity and the second cavity, and the first cavity and the second cavity are connected in a matching manner through the penetration pipes and the connecting pipe orifices 211. The data acquisition device 5 is a computer and is connected with the water pressure and water quantity double-control servo device 42, the displacement pressure double-control servo device 41, the flow sensor 7 and the pore water pressure sensor 6 through signals, so that the real-time monitoring of the pore water pressure, the flow and the displacement information is realized.
In the loading hydraulic cylinder, the part adjacent to the water inlet loading head is defined as a first loading hydraulic cylinder, and the part adjacent to the water outlet loading head is defined as a second loading hydraulic cylinder, wherein the plunger end of the first loading hydraulic cylinder is connected with the water inlet loading head 31, the other end of the water inlet loading head 31 is connected with the first cavity 21, the first cavity 21 is connected with the second cavity 22 through a permeation component, the other end of the second cavity is connected with the water outlet loading head, and the plunger end of the second loading hydraulic cylinder is connected with the water outlet loading head through a connecting rod.
In the present invention, it is preferable that the first and second cavities are respectively provided with an arc-shaped pressing member 24, as shown in fig. 1, such as a semicircular pressing strip plate, which straddles the first and second cavities and is assembled with a rigid bracket and fixed by the fastening bolt 13.
According to the invention, the water outlet end of the water inlet loading head is preferably a circular plate, the circle center of the circular plate outwards defines a plurality of concentric circles, and a plurality of water permeable holes are arranged on the circumferences of the concentric circles at equal intervals.
The invention relates to a test system for simulating water inrush channel expansion and evolution of stope surrounding rocks, which is applied to test and comprises the following steps:
firstly, according to the existence condition of rocks in actual geology, according to research contents, a simulation material is laid in a test tube and is arranged on a test bed 12, specifically, a first cavity 21, a second cavity 22 and a permeation tube 23 are selected, a proper variable-diameter water outlet hole 321 is selected to be arranged in the second cavity 22, then the simulation material is laid in the test tube according to actual rock parameters, the compaction of the simulation material and the alignment connection of the first cavity 21, the second cavity 22 and the permeation tube 23 on the test bed 12 are ensured, the test tube is fixed on the test bed 12 through an arc-shaped pressing part 24 such as a pressing slat, a water outlet loading head 32 is arranged at the lower port of the test tube, and a water inlet loading head 31 is arranged at the upper port of the test tube;
(2) closing the water inlet valve 8 and the water flow switch 231, starting the displacement pressure double-control servo device 41, applying vertical loads to the water outlet loading head 32 and the water inlet loading head 31 step by step until a preset design simulation load is reached, and monitoring the deformation condition of a simulation material in the test tube in real time;
(3) after the deformation of the simulated material is stable, opening a water inlet valve and a water flow switch 231, starting a water pressure and water flow double-control servo device 42, setting required water pressure and water flow, and collecting pore water pressure, flow and displacement information in the test process;
(4) and (3) replacing different simulation materials and the variable-diameter water outlet hole 321, modifying the corresponding operation states of the displacement pressure double-control servo device 41 and the water pressure and water quantity double-control servo device 42, and repeating the steps.
Parts which are not described in the invention can be realized by adopting or referring to the prior art.
Although terms such as the first chamber, the permeable member, etc. are used more often herein, the possibility of using other terms is not excluded, and those skilled in the art should make simple substitutions of these terms in light of the present disclosure within the scope of the present disclosure.
Claims (3)
1. The utility model provides a simulation porous medium rock mass infiltration passageway fluid migration test system, its includes test device, the two accuse servo device of water pressure water yield, the two accuse servo device of displacement pressure and data acquisition device, test device includes rigid base and is located test bench on the rigid base, the test bench is square frame construction, the space in the square frame construction forms the test chamber, its characterized in that:
a water inlet loading head, a water outlet loading head, a first cavity, a second cavity and a penetration assembly are arranged in the test chamber, a first loading hydraulic cylinder and a second loading hydraulic cylinder are respectively arranged on two sides of the test chamber, a plunger end of the first loading hydraulic cylinder is connected with the water inlet loading head, the other end of the water inlet loading head is connected with the first cavity, the first cavity is connected with the second cavity through the penetration assembly, the other end of the second cavity is connected with the water outlet loading head, and a plunger end of the second loading hydraulic cylinder is connected with the water outlet loading head through a connecting rod;
the infiltration assembly comprises a plurality of infiltration pipes which are arranged in parallel, a water flow switch, a flow sensor and a pore water pressure sensor are arranged in each infiltration pipe, a plurality of connecting pipe orifices are distributed on the first cavity and the second cavity, and the first cavity and the second cavity are connected in a matched mode through the infiltration pipes and the connecting pipe orifices;
the water inlet loading head is connected with the water pressure and water quantity double-control servo device through a water inlet pipeline;
the first loading hydraulic cylinder is connected with the displacement pressure double-control servo device;
the data acquisition device is respectively connected with the water pressure and water quantity double-control servo device, the displacement pressure double-control servo device, the flow sensor and the pore water pressure sensor through signals;
the water outlet loading head comprises a water outlet loading head body, a diameter-variable water outlet hole, a connecting rod and a sealing rubber layer positioned on the periphery of the water outlet loading head body, and the water outlet loading head is connected with the second loading hydraulic cylinder through the connecting rod.
2. The fluid migration test system for simulating the porous medium rock mass permeability channel according to claim 1, characterized in that: the water inlet loading head comprises a cylindrical barrel, a cylindrical cavity is formed in the cylindrical barrel, a water inlet valve is arranged on the cylindrical barrel, the water inlet loading head is connected with the water inlet pipeline, the water outlet end of the water inlet loading head is a circular plate, a plurality of concentric circles are outwards defined by the circle center of the circular plate, and a plurality of water permeable holes are arranged on the circumference of the concentric circles at equal intervals.
3. The fluid migration test system for simulating the porous medium rock mass permeability channel according to claim 1, characterized in that: arc-shaped pressing parts are respectively arranged on the first cavity and the second cavity, and two end parts of each arc-shaped pressing part are connected with a rigid support and are fixed on the rigid supports in a matched mode through bolts.
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| CN111366707B (en) * | 2020-04-14 | 2022-10-25 | 山东科技大学 | Test system and method for simulating coupling flow of multiple types of water guide channels |
| CN114112840A (en) * | 2021-11-17 | 2022-03-01 | 中国地质大学（武汉） | Test device and method for researching pore-fracture dual-medium seepage characteristics |
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| JP2014119422A (en) * | 2012-12-19 | 2014-06-30 | Mitsubishi Heavy Ind Ltd | Inner pressure testing device and inner pressure testing method |
| CN204327082U (en) * | 2014-12-10 | 2015-05-13 | 西安科技大学 | A kind of coal measure strata structure large scale fracture seepage physical simulation experimental rig |
| CN105004509A (en) * | 2015-07-30 | 2015-10-28 | 中国电建集团昆明勘测设计研究院有限公司 | Structural fracture filling structure water and mud outburst test device |
| CN205374249U (en) * | 2016-01-28 | 2016-07-06 | 山东科技大学 | Bottom plate rock mass osmotic coefficient test analog system |
| CN107356510A (en) * | 2017-08-11 | 2017-11-17 | 山东科技大学 | Simulate face surrounding rock water inrush channel extension evolution pilot system |
| CN206710220U (en) * | 2017-05-09 | 2017-12-05 | 湖南科技大学 | A kind of mud-water converting device of prominent mud experiment |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014119422A (en) * | 2012-12-19 | 2014-06-30 | Mitsubishi Heavy Ind Ltd | Inner pressure testing device and inner pressure testing method |
| CN204327082U (en) * | 2014-12-10 | 2015-05-13 | 西安科技大学 | A kind of coal measure strata structure large scale fracture seepage physical simulation experimental rig |
| CN105004509A (en) * | 2015-07-30 | 2015-10-28 | 中国电建集团昆明勘测设计研究院有限公司 | Structural fracture filling structure water and mud outburst test device |
| CN205374249U (en) * | 2016-01-28 | 2016-07-06 | 山东科技大学 | Bottom plate rock mass osmotic coefficient test analog system |
| CN206710220U (en) * | 2017-05-09 | 2017-12-05 | 湖南科技大学 | A kind of mud-water converting device of prominent mud experiment |
| CN107356510A (en) * | 2017-08-11 | 2017-11-17 | 山东科技大学 | Simulate face surrounding rock water inrush channel extension evolution pilot system |
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