CN116025417A - Coal roadway compressed air reservoir test method - Google Patents
Coal roadway compressed air reservoir test method Download PDFInfo
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- CN116025417A CN116025417A CN202211573105.7A CN202211573105A CN116025417A CN 116025417 A CN116025417 A CN 116025417A CN 202211573105 A CN202211573105 A CN 202211573105A CN 116025417 A CN116025417 A CN 116025417A
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Abstract
The invention relates to a coal roadway compressed air reservoir test method, which comprises the following steps: placing a lining structure model with a detection element on the inner side surface on the stratum model, and plugging two ends of the lining structure model by using plugging components; the method comprises the steps that Zhou Tianzhu surrounding rock damage areas are arranged outside a lining structure model, each surrounding rock damage area comprises a plurality of surrounding rock blocks filled with surrounding rock similar materials, gaps between adjacent surrounding rock blocks are filled with crack layers, and detection elements are buried in the surrounding rock blocks in the filling process; filling an upper surrounding rock area outside the surrounding rock damage area; the method can realize the mechanistic problem encountered in the process of revealing the coal roadway to be transformed into the compressed air reservoir through a test means.
Description
Technical Field
The invention relates to the technical field of compressed air energy storage, in particular to a coal roadway compressed air reservoir test method.
Background
The underground gas storage mainly adopts depleted oil and gas reservoirs and salt caves for building, has good tightness and low building cost, but depends on special geological structures and is difficult to popularize in first-line cities on a large scale. If the existing abandoned mine tunnel is transformed into a compressed air reservoir, the deep application of the energy storage technology is further enhanced, clean transformation of the energy structure is promoted, a power grid friendly power supply with self peak clipping and valley filling capability and stable output is formed, and the economic benefit is remarkable.
In analogy to the requirements of salt cavern construction, the waste cavern modification needs to be considered to include: the tightness, stability and durability of the gas storage. The thermodynamic changes associated with air compression, storage and release affect the temperature, stress and deformation of the seal layer, liner and surrounding rock structures. Different from a newly built hard rock chamber, in a typical inflation and deflation operation mode, the waste mine tunnel is reformed into a reservoir with specificity. The following aspects are presented: the damage area of surrounding rock of the abandoned coal mine tunnel is obvious, and the stability problem of the abandoned tunnel applied to compressed air energy storage is to be solved; the influence of ponding leakage on the operation of the reservoir needs to be considered; the problem of local damage of the sealing layer caused by defects such as lining cracking and the like is not solved; the temperature of the compressed air in the storage is lower than zero ℃ after being released, and the compressed air is in a negative temperature state. The key scientific problems encountered in the construction and operation and maintenance of the coal roadway energy storage warehouse are required to be researched through a large-scale test, but the corresponding test means are missing at present, and the mechanistic problems encountered in the process of modifying the coal roadway into the compressed air warehouse cannot be revealed.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a coal roadway compressed air reservoir test method, which can reveal the mechanistic problems encountered in the process of modifying a coal roadway into a compressed air reservoir through test means.
In order to achieve the above object, the present invention is realized by the following technical scheme:
the embodiment of the invention provides a coal roadway compressed air reservoir test method, which is characterized by comprising the following steps of:
placing a lining structure model with a detection element on the inner side surface on the stratum model, and plugging two ends of the lining structure model by using plugging components;
the method comprises the steps that Zhou Tianzhu surrounding rock damage areas are arranged outside a lining structure model, each surrounding rock damage area comprises a plurality of surrounding rock blocks filled with surrounding rock similar materials, gaps between adjacent surrounding rock blocks are filled with crack layers, and detection elements are buried in the surrounding rock blocks in the filling process;
filling an upper surrounding rock area outside the surrounding rock damage area;
and (3) introducing seepage water into the top of the overlying surrounding rock area, inflating and deflating a gas storage in the lining structural model, and recording parameters obtained by detection of the detection element.
Optionally, a sealing layer is arranged on the inner surface of the lining structure model, and distributed optical fibers and stress meters are arranged on the inner surface of the sealing layer and used as detection elements of the inner surface of the lining structure model.
Optionally, the sealing layer comprises a first sealing layer positioned on the inner surface of the lining structure model and a second sealing layer positioned on the surface of the first sealing layer, wherein the first sealing layer is made of phenolic foam material or B1-level polyurethane spraying heat-insulating material or foaming cement, and the second sealing layer is made of steel plate or butyl rubber or ethylene propylene diene monomer rubber or natural rubber or glass fiber reinforced plastic.
Optionally, for a crack material layer in a horizontal direction or with an acute angle set with the horizontal direction, firstly filling surrounding rock below the crack material layer, then placing a crack template above the filled surrounding rock and compacting the crack template to form a surface along the shape of the crack, then taking down the crack template, paving a crack similar material to form a crack layer, and then filling the surrounding rock above the crack layer; for the vertical fracture layer, firstly placing a fracture template, then filling surrounding rock blocks on two sides of the fracture template, taking out the fracture template, and then blowing in a fracture similar material to form the fracture layer.
Optionally, when the surrounding rock damaged area is filled, filling all surrounding rock blocks, arranging a crack template between adjacent surrounding rock blocks, and then drawing out the crack template from one side along the longitudinal direction of the lining structural model, and blowing in a crack similar material from the other side.
Optionally, when the surrounding rock damaged area is filled, filling all surrounding rock blocks, arranging a crack template between adjacent surrounding rock blocks, drilling and injecting water to the crack template by adopting a water-soluble supporting material, gradually ablating the crack template, and blowing in a similar crack material.
Optionally, the plugging component adopts a concrete air plug poured at the end part of the lining structure model, wherein the concrete air plug at one end is provided with an air inlet hole and an air outlet hole;
further, an expansion membrane bag is arranged between the concrete air plug and the inner side surface of the end part of the lining structure model, cement-water glass rapid hardening slurry is injected into the expansion membrane bag after the concrete air plug is poured, and the expansion membrane bag is expanded to seal between the concrete air plug and the inner side surface of the lining structure model.
Optionally, fill gassing to lining structure model inside through filling gassing mechanism, fill gassing mechanism and include compressed air supply element, compressed air supply element is connected with the one end of intake pipe, and the other end of intake pipe stretches into lining structure model inner space through the inlet port, and gas outlet department is fixed with the outlet duct, and the outlet duct communicates lining structure model inner space and outside space, and the valve is all installed to intake pipe and outlet duct.
Optionally, the detecting elements inside the surrounding rock block are a plurality of osmometers and stress meters.
Optionally, a water tank is placed at the top of the upper surrounding rock area, water is contained in the water tank, and a water through hole is formed in the bottom wall of the water tank so as to realize that the upper surrounding rock area of the tank is filled with water;
further, a heating element is arranged in the water tank.
The beneficial effects of the invention are as follows:
1. according to the test method, the surrounding rock damage area is arranged on the periphery of the lining structure model, the surrounding rock damage area comprises a plurality of surrounding rock blocks, a crack material layer is arranged between the adjacent surrounding rock blocks, the non-uniform damage effect of surrounding rock is simulated, the seepage water is introduced into the top of the upper surrounding rock layer, the structural performance degradation effect caused by seepage, the defects such as temperature and internal pressure circulation loading and unloading, lining cracking and wall rear cavity and the like or the local damage of the sealing layer caused by sectional lining dislocation deformation are simulated, various adverse conditions that a coal roadway is built into a compressed air reservoir are comprehensively considered, the actual working condition of the coal roadway can be simulated more truly, the mechanistic problem encountered in the process of modifying the coal roadway into the compressed air reservoir is revealed through the test means, and great theoretical guiding significance is achieved.
2. The test method provided by the invention can be used for researching the influence rules of structural parameters (such as various lining forms and thicknesses, sealing layer materials and forms, stratum temperature and the like) and operation parameters (such as gas injection temperature, gas filling and discharging rate, minimum operation pressure and the like) on the stability, air tightness and durability of the compressed air reservoir in the operation period by simulating various adverse conditions of a coal roadway and having lining structure models, plugging components and the like, and can be used for supplementing the numerical simulation work and verifying the reliability. By controlling the operation parameters, the thermodynamic change process (temperature and pressure change) of compressed air in the storage is quantitatively analyzed, and scientific guidance is provided for construction and operation and maintenance of the abandoned coal roadway gas storage. Through the long-term gassing operation of filling, carry out the actual measurement to gas storage leakage rate, on the one hand help improving the sealed form of tunnel shutoff end, on the other hand also have examined the durability of current lining form.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a flow chart of the method of example 1 of the present invention;
FIG. 2 is a schematic view of a lining structural model, a surrounding rock damaged area and an overlying surrounding rock area prepared by the method of example 1 of the present invention;
FIG. 3 is an enlarged view of a portion of the invention at A in FIG. 2;
FIG. 4 is an enlarged view of a portion of the invention at B in FIG. 2;
FIG. 5 is a schematic view showing the installation of the inflation/deflation mechanism in embodiment 1;
FIG. 6 is an enlarged view of a portion of FIG. 5 at C in accordance with the present invention;
FIG. 7 is a schematic view showing distribution of a distributed optical fiber in a lining structural model according to embodiment 1 of the present invention;
the system comprises a first surrounding rock block 1, a second surrounding rock block 2, a third surrounding rock block 3, a fourth surrounding rock block 4, a fifth surrounding rock block 5, a sixth surrounding rock block 6, a lining structural model 7, a first sealing layer 8, a second sealing layer 9, a first fracture layer 10, a second fracture layer 11, a third fracture layer 12, a fourth fracture layer 13, a fifth fracture layer 14, an air inlet pipe 15, an air outlet pipe 16, an air outlet pipe 17, a concrete air plug with pipe holes 18, an air inlet valve 19, a concrete air plug 20, an air compressor 21, a thermometer 22, an air flowmeter 23, a thermometer 24, an air flowmeter 25, an air outlet valve 26, a pressure gauge 27, a distributed optical fiber 28, an osmometer 29, a stress gauge 30, a bolt 31, an expansion membrane bag 32, a gap 33, an overlying surrounding rock area 34, a water tank 35, a thermistor detecting temperature rod 36, a stratum reservoir 37.
Detailed Description
Example 1:
the embodiment provides a coal roadway compressed air reservoir test method, which is shown in fig. 1-6, and comprises the following steps:
step 1: preparing a surrounding rock similar material and a crack filling similar material, wherein the surrounding rock similar material is used for a stratum model, a surrounding rock damage area and an overlying surrounding rock area, the stratum model is a model at the lowest part and is used for supporting a lining structure model, the surrounding rock damage area and the overlying surrounding rock area, the surrounding rock damage area is the surrounding rock similar material arranged in a set range of the periphery of the lining structure model, and the overlying surrounding rock area is the surrounding rock similar material arranged outside the surrounding rock damage area. The specific method comprises the following steps:
step a: and determining the similarity ratio of the model test according to the fluid-solid coupling similarity principle.
Step b: the strength and permeability test of the raw rock is carried out, and the method comprises the following two steps: and firstly, carrying out on-site coring sampling on the target stratum, and making a standard sample piece on the core sample. And secondly, testing the compressive strength and the permeability of the raw rock by adopting a single-shaft testing machine and a penetrometer according to a test procedure, and obtaining a test result.
Step c: developing fluid-solid coupling similar materials and crack filling similar materials comprises the following two steps: the raw materials are selected according to the performance requirements of the developed materials. And secondly, designing similar material proportions, and respectively manufacturing 3 strength test pieces and 3 permeability test pieces for each group of proportions. The basic mechanical parameters of the similar materials, namely uniaxial compressive strength and impermeability, are tested, and the regulation and control range of the strength of the similar materials is determined. And thirdly, comparing the strength and permeability of the original rock and similar materials according to the physical and mechanical parameters and the similar ratio of the original rock to obtain the corresponding similar ratio. The design principle of the crack filling material is that under the dead weight stress of the overlying stratum, the crack filling layer is broken in a block shape to form natural cracks. The compressive strength is smaller, the self-weight stress of the stratum can be calculated, and the proportion of the crack filling material is selected according to the principle.
And manufacturing corresponding surrounding rock similar materials and crack filling similar materials according to the determined material proportion.
The above steps are performed by conventional methods, and detailed methods thereof are not described in detail herein.
In this embodiment, the material parameters of the stratum, surrounding rock damaged area and overlying surrounding rock area are compared with those of the rock sample as shown in the following table:
table 1: similar material parameter meter
Step 2: and manufacturing a lining structure model 7, wherein the lining structure model adopts a conventional reinforced concrete lining or grouting type prestress lining or ring anchor type prestress lining or block type lining. The section of the roadway can be rectangular, trapezoidal, straight-wall semicircular arch, three-heart arch, closed arch, elliptic and circular.
In the embodiment, the lining structure model 7 is a block type lining structure model, the section of the roadway is in the shape of a straight wall semicircle, and the thickness of the lining structure model is 10cm-50cm.
Comprising a cube block of a straight wall part and a semicircular block of an arch part.
Both ends of the semicircular block are fixed with cube blocks to form the whole lining structure model.
In this embodiment, the cube blocks and the semicircular blocks are connected by bolts 30, and a sealing layer is arranged inside the lining.
The sealing layer adopts two layers, and comprises a first sealing layer 8 arranged on the inner side surface of the lining structure model and a second sealing layer 9 arranged on the inner side surface of the first sealing layer.
The material of the first sealing layer 8 is mainly considered on heat insulation, and phenolic foam materials, B1-grade polyurethane spraying heat insulation materials, foaming cement and the like can be selected.
In this example, a foamed cement layer 2cm thick was used for the first seal layer 8. And spraying foaming cement to the inner surface of the lining structural model.
The second seal layer 9 material is mainly considering the tightness, and can be selected from steel plate, butyl rubber, ethylene propylene diene monomer rubber, natural rubber, glass fiber reinforced plastic and the like, wherein the thickness range of the second seal layer 9 material is 0.5cm to 2cm.
In the embodiment, the second sealing layer 9 is made of butyl rubber with the thickness of 1cm and is fixed on the inner surface of the foaming cement layer in a hot melting mode.
A distributed optical fiber 27 and a stress meter 29 are arranged on the inner side surface of the second sealing layer corresponding to the semicircular block and are used for detecting the temperature and the strain change of the structure during the air inflation and air release test in the lining structure model.
As shown in fig. 7, the distributed optical fibers 27 are divided into a plurality of segments, each of which is arranged along the axial direction of the lining structural model, and a plurality of segments are arranged along the circumferential direction of the semicircular block.
Step 3: and (3) paving a stratum model 36 in the bottom box wall of the model test phase, wherein the stratum model 36 is paved by adopting the surrounding rock similar materials corresponding to the stratum model prepared in the step (1), and layering paving is adopted during paving. And (3) carrying out layered compaction on the filled stratum by adopting the pressure with the same size as that of the test piece made of the similar material.
Step 4: when the compaction height of the stratum model 36 reaches 10cm, the lining structure model 7 manufactured in the step 2 is placed on the paved stratum model, plugging components are placed at two ends of the lining structure model 7 for plugging, the plugging components adopt concrete air plugs 19 matched with the section shape of the lining structure model, annular protrusions with conical sections are arranged at the ends, close to the lining structure model, of the concrete air plugs 19, the outer edge size of the annular protrusions is larger than that of the lining structure model, a first sealing layer and a second sealing layer are sequentially arranged at the inner side, close to the lining structure model 7, of the concrete air plugs 19, and the arrangement mode of the first sealing layer and the second sealing layer is the same as that of the first sealing layer and the second sealing layer of the inner side of the lining structure model.
The expansion membrane bag 31 is arranged on the outer side face of the concrete air plug, cement-water glass rapid hardening slurry can be injected into the expansion membrane bag 31, gaps 32 of contact parts of the concrete air plug and surrounding rock damaged areas can be filled after the expansion membrane bag is expanded, surrounding rock similar materials of the stratum model and the surrounding rock damaged areas are compacted, and the air tightness of the structure is improved.
The concrete air plug at one side is provided with an air inlet and an air outlet, and a concrete air plug 17 with pipe holes is formed and is used for inflating and deflating the inner space of the lining structure model 7.
In this embodiment, in order to reduce heat exchange between high-temperature and high-pressure air and surrounding rock lining in the operation process, a double-layer heat preservation measure based on foam cement is proposed. Particularly, the concrete air lock treatment method can be popularized and applied to engineering practical application. The energy loss is greatly reduced while the tightness is ensured, and the total power generation amount of the compressed air energy storage power station is improved. The proposal of the jet type heat preservation material also lays a foundation for the intelligent unmanned construction of the coal roadway reservoir sealing layer construction in the future.
Step 5: and filling a surrounding rock damage area at the periphery of the lining structure model.
In this embodiment, the distance between the outer edge of the surrounding rock damaged area and the outer edge of the lining structural model is 0.8m-1.2m, preferably 1m, and the surrounding rock damaged area is filled in the range of 1m at the periphery of the lining structural model.
Specifically, the surrounding rock damage area includes a first surrounding rock mass 1, a second surrounding rock mass 2, a third surrounding rock mass 3, a fourth surrounding rock mass 4, a fifth surrounding rock mass 5, and a sixth surrounding rock mass 6.
A first crack layer 10 is arranged between the first surrounding rock block 1 and the second surrounding rock block 2, the first crack layer 10 is approximately horizontally arranged, a second crack layer 11 is arranged between the second surrounding rock block 2 and the third surrounding rock block 3, the second crack layer 11 is arranged at a certain acute angle with the horizontal direction, a third crack layer 12 is arranged between the third surrounding rock block 3 and the fourth surrounding rock block 4, the third crack layer 12 is approximately vertically arranged, a fourth crack layer 13 is arranged between the fourth surrounding rock block 4 and the fifth surrounding rock block 5, the fourth crack layer 13 is arranged at a set acute angle with the horizontal direction, a fifth crack layer 14 is arranged between the fifth surrounding rock block 5 and the sixth surrounding rock block 6, and the fifth crack layer 14 is approximately horizontally arranged.
The construction steps of the surrounding rock damage area in the embodiment are as follows:
and filling surrounding rock similar materials into the first surrounding rock block 1 and the sixth surrounding rock block 6 in a layering manner, placing a crack template after the compaction height reaches a set value, and compacting the crack template to enable the shapes of the upper surfaces of the first surrounding rock block 1 and the sixth surrounding rock block 6 to be matched with the shapes of cracks.
And (3) carrying out layered compaction on the filled surrounding rock blocks by adopting the pressure with the same size as that of the test piece made of the similar material.
The fracture template is removed and then a fracture-like material is laid along the upper surfaces of the first and sixth surrounding rock pieces 1, 6 to form the first and fifth fracture layers 10, 14.
And filling the second surrounding rock block 2 and the fifth surrounding rock block 5 on the upper surfaces of the first fracture layer 10 and the fifth fracture layer 14 respectively in a layered manner, after filling to a set height, extruding the upper surfaces of the second surrounding rock block and the 2 fifth surrounding rock block 5 into fracture shapes by using corresponding fracture templates by adopting the same method, withdrawing the fracture templates, and paving fracture similar materials on the upper surfaces of the second surrounding rock block 2 and the fifth surrounding rock block 5 to form a second fracture layer 11 and a fourth fracture layer 13.
And placing a crack template in the middle of the vault of the lining structure model for positioning, then carrying out layered filling on the third surrounding rock 3 and the fourth surrounding rock 4 on two sides of the crack template, after filling, dismantling two longitudinal side box walls of the lining structure model in the direction perpendicular to the axis of the lining structure model, withdrawing the crack template from one side along the axis of the lining structure model through a steel rope connection tractor, and simultaneously blowing a crack similar material into a gap between the third surrounding rock 3 and the fourth surrounding rock 4 through a sand blasting machine on the other side to form a third crack layer 12.
After the surrounding rock damaged area is filled, cement-water glass rapid hardening slurry is injected into the expansion membrane bag 31. The expansion membrane bag 31 is expanded to compact the surrounding rock similar materials of the stratum and the surrounding rock damaged area, so that the air tightness of the structure is improved, and cracks are reduced.
In the process of filling the surrounding rock blocks in a layered manner, a plurality of detection elements are embedded, wherein the detection elements adopt an osmometer and a stress meter, the osmometer 28 is embedded in the first surrounding rock block, the second surrounding rock block and the third surrounding rock block, and the stress meter 29 is embedded in the remaining surrounding rock blocks. The device is used for monitoring the internal osmotic pressure and the stress change of the structure during the air inflation and deflation test.
The crack template is obtained by adopting a 3D printing method, and the crack similar material is obtained by adopting sand with a set water content.
Step 6: and reinstalling the side box walls, and filling the remaining area of the model box with surrounding rock similar materials to form an overlying surrounding rock area positioned at the periphery of the surrounding rock damage area. The whole model has the dimensions of 3m long, 3m wide and 2m high
Step 7: the air charging and discharging mechanism comprises an air inlet pipe 15, an air outlet pipe 16 and a compressed air supply element, wherein the compressed air supply element adopts an air compressor 20, the air inlet pipe 15 is inserted into an air inlet of a concrete air plug 19 at one side, one end of the air inlet pipe 15 is inserted into an air storage 37 formed in the inner space of a lining structure model 7, the other end of the air inlet pipe is connected with the air compressor 20 through an air inlet valve 18, the air outlet pipe 16 is arranged at the air outlet, the inner space of the lining structure model is communicated with the outer space through the air outlet pipe, and an air outlet valve 25 is arranged on the air outlet pipe.
The air inlet pipe 15 is also provided with a pressure gauge 26, an air flow meter 22 and a thermometer 21, wherein the pressure gauge 26 is used for detecting the pressure of air in the lining structure model, the air flow meter 22 is used for detecting the air inflation time and air inflation temperature, and the thermometer 21 is used for detecting the air inflation temperature.
An air flow meter 24 and a thermometer 23 are arranged on the air outlet pipe 16 and are respectively used for detecting the flow rate and the air outlet temperature of air outlet.
In this embodiment, the air inlet valve and the air outlet valve are ball valves.
Pressurizing a gas storage 37 formed in the inner space of the lining structure model 7 through an air compressor 20, stopping pressurizing when a pressure gauge 16 on the air inlet pipe 15 displays 15MPa, and immediately closing an air inlet valve 18 on the air inlet pipe; the air flow meter 22 on the air inlet pipe 15 is used for monitoring the air injection rate, so that the simulation of the working conditions with different air injection rates is realized.
The air outlet valve 25 on the air outlet pipe 16 is opened, so that air discharge can be realized, and the simulation of different air discharge rate working conditions can be accurately realized by combining the display of the initial flow rate of the air flow meter 24 on the air outlet pipe.
Step 8: a water tank 34 with a heating element arranged inside is placed on the top surface of the overlying surrounding rock area 33, a water inlet of the water tank 34 is connected with an outlet of the constant-pressure pneumatic diaphragm pump through a pipeline, an inlet of the constant-pressure pneumatic diaphragm pump is connected with a water source through a pipeline, and the constant-pressure starting diaphragm pump is connected with an air compressor to drive the air compressor to work, so that a confined aquifer is provided.
In this embodiment, the heating element adopts a thermistor to detect the temperature type heating rod 35, so as to heat the confined aquifer.
The bottom wall of the tank 34 is provided with a number of water openings to enable the tank to deliver permeate water to the overburden 33.
Heterogeneous damage is considered to be two parts, one being micro-fissures inside the surrounding rock created by the excavation, causing the lining to be in heterogeneous contact with the surrounding rock. Secondly, the surrounding rock material simulates the permeation-weakening-damage process of the stratum under the long-term infiltration effect of the underground water, and the two parts can be truly simulated through the arrangement of the step 5 and the step 8, so that the accuracy of a test result is ensured.
The method is suitable for simulating construction of heterogeneous damage areas of single-type stratum and composite-type stratum, and the simulated stratum is uniformly isolated by muscovite powder.
Step 9: the test was started and the air compressor of the air charging and discharging mechanism and the air compressor connected to the constant pressure pneumatic diaphragm pump were started. A typical operation mode test flow is established, specifically as follows:
in the gas storage stage, the initial gas pressure in the gas storage formed in the inner space of the lining structure model is 100kPa, the gas injection temperature is 20 ℃, and the highest gas pressure in the gas storage formed in the inner space of the lining structure model is controlled to be 15MPa. The rate of inflation is monitored by an air flow meter of the air intake, controlled by the air compressor 20 and valves on the air intake. The inflation temperature is monitored by a thermometer on the air inlet pipe. The final charge pressure is monitored by a pressure gauge 26 of the inlet line.
In the air release stage, a valve on an air outlet pipe is opened and regulated to control the air release rate to reach the standard air release rate. The air release rate is monitored by an air flow meter 24 on the air outlet pipe, and the air release temperature is monitored by a thermometer 23 on the air outlet pipe.
In the gas storage stage and the gas release stage, the distributed optical fibers 27 on the inner surface of the lining structure model can be used for testing and obtaining the temperature and strain changes of the lining structure and the sealing layer during the air inflation and release test, and the stress meter 29 can be used for testing and obtaining the stress changes of the lining structure model and the sealing layer structure during the air inflation and release test.
The osmometer and the stress meter in the surrounding rock damage area monitor the internal osmotic pressure and the stress change of the structure during the air inflation and deflation test. And recording the parameters measured by the detection element.
By adopting the method of the embodiment, the heterogeneous damage effect of surrounding rock is simulated, the structural performance degradation effect caused by seepage, the defects of temperature and internal pressure circulation loading and unloading, lining cracking, wall back cavity and the like or the local damage of the sealing layer caused by sectional lining dislocation deformation are simulated, various adverse conditions of the construction of the coal roadway as a compressed air reservoir are comprehensively considered, the actual working condition of the coal roadway can be simulated more truly, the mechanistic problem encountered in the process of the coal roadway reconstruction into the compressed air reservoir is revealed through a test means, the method has great theoretical guiding significance, various adverse conditions of the coal roadway are simulated, lining structure models, plugging components and the like are provided, the method can be used for researching the influence rules of structural parameters (such as various lining forms and thicknesses, sealing layer materials and forms, stratum temperature and the like), operation parameters (such as gas injection temperature, gas filling and discharging rate, minimum operation pressure and the like) on the compressed air reservoir in the operation period, and supplement and reliability verification are provided for numerical simulation work. By controlling the operation parameters, the thermodynamic change process (temperature and pressure change) of compressed air in the storage is quantitatively analyzed, and scientific guidance is provided for construction and operation and maintenance of the abandoned coal roadway gas storage. Through the long-term gassing operation of filling, carry out the actual measurement to gas storage leakage rate, on the one hand help improving the sealed form of tunnel shutoff end, on the other hand also have examined the durability of current lining form.
Example 2
The embodiment provides a coal roadway compressed air reservoir test method, which is different from embodiment 1 only in that when a surrounding rock damaged area is filled, all surrounding rock blocks and corresponding crack templates are constructed, wherein the construction sequence is a first surrounding rock block, a crack template corresponding to a first crack layer, a sixth surrounding rock block, a crack template corresponding to a fifth crack, a second surrounding rock block, a crack template corresponding to a second crack layer, a fifth surrounding rock block, a crack template corresponding to a fourth crack, a crack template corresponding to a third crack, a third surrounding rock block and a fourth surrounding rock block.
And then removing two side tank walls of the model tank perpendicular to the axis of the lining structure model, sequentially extracting the crack templates to one side along the axis direction of the lining structure model by a steel rope connection tractor according to the sequence of the first crack, the fifth crack, the second crack, the fourth crack and the third crack, spraying crack similar materials into the cracks by a sand blasting machine at the other side while extracting the crack templates until the crack templates are completely pulled out, and then reinstalling the side tank walls of the model tank.
The slit template is obtained by adopting a 3D printing method.
Other steps of the method are the same as those of example 1, and a repetitive description thereof will not be given here.
Example 3
The embodiment provides a coal roadway compressed air reservoir test method, which is different from embodiment 2 in that the crack template is made of an existing water-soluble supporting material, specifically, is made of water-soluble 3D printing consumable PVA, and is made into a three-way curved surface shape, wherein the crack thickness, the crack width and the crack ductility are all nonlinear changes.
And (3) detaching the wall thickness of the side box vertical to the axis of the lining structure model, drilling holes on one side of the crack template and injecting water to enable the crack template to be gradually ablated, and spraying crack similar materials into the cracks on the same side through a sand blasting machine.
Other process steps are the same as in example 2 and are not described in detail here.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (10)
1. The coal roadway compressed air reservoir test method is characterized by comprising the following steps of:
placing a lining structure model with a detection element on the inner side surface on the stratum model, and plugging two ends of the lining structure model by using plugging components;
the method comprises the steps that Zhou Tianzhu surrounding rock damage areas are arranged outside a lining structure model, each surrounding rock damage area comprises a plurality of surrounding rock blocks filled with surrounding rock similar materials, gaps between adjacent surrounding rock blocks are filled with crack layers, and detection elements are buried in the surrounding rock blocks in the filling process;
filling an upper surrounding rock area outside the surrounding rock damage area;
and (3) introducing seepage water into the top of the overlying surrounding rock area, inflating and deflating a gas storage in the lining structural model, and recording parameters obtained by detection of the detection element.
2. The coal roadway compressed air reservoir test method of claim 1, wherein a sealing layer is arranged on the inner surface of the lining structure model, and distributed optical fibers and stress meters are arranged on the inner surface of the sealing layer and serve as detection elements of the inner surface of the lining structure model.
3. The method for testing the compressed air storage in the coal roadway according to claim 2, wherein the sealing layer comprises a first sealing layer positioned on the inner surface of the lining structural model and a second sealing layer positioned on the surface of the first sealing layer, the first sealing layer is made of phenolic foam materials or B1-grade polyurethane spraying heat-insulating materials or foaming cement, and the second sealing layer is made of steel plates or butyl rubber or ethylene propylene diene monomer rubber or natural rubber or glass fiber reinforced plastics.
4. A coal roadway compressed air reservoir testing method as recited in claim 1, wherein,
for a crack layer with a set acute angle in the horizontal direction or the horizontal direction, firstly filling surrounding rock blocks below the crack layer, then placing a crack template above the filled surrounding rock blocks and compacting the crack template to form a surface along the shape of the crack, then taking down the crack template, paving a crack similar material to form the crack layer, and then filling surrounding rock blocks above the crack layer;
for the vertical fracture layer, firstly placing a fracture template, then filling surrounding rock blocks on two sides of the fracture template, taking out the fracture template, and then blowing in a fracture similar material to form the fracture layer.
5. The method for testing a compressed air storage in a coal roadway according to claim 1, wherein when the surrounding rock damaged area is filled, filling all surrounding rock blocks is completed, a crack template is arranged between adjacent surrounding rock blocks, and then the crack template is pulled out from one side along the longitudinal direction of the lining structure model, and simultaneously, a crack similar material is blown into the other side.
6. The method for testing the compressed air reservoir in the coal roadway according to claim 1, wherein when the surrounding rock damaged area is filled, filling all surrounding rock blocks is completed, a crack template is arranged between adjacent surrounding rock blocks, the crack template is made of a water-soluble supporting material, the crack template is drilled and injected with water, the crack template is gradually ablated, and meanwhile, a crack similar material is blown in.
7. The coal roadway compressed air reservoir test method of claim 1, wherein the plugging assembly is a concrete air plug poured at the end part of the lining structure model, and the concrete air plug at one end is provided with an air inlet hole and an air outlet hole;
further, an expansion membrane bag is arranged between the concrete air plug and the inner side surface of the end part of the lining structure model, cement-water glass rapid hardening slurry is injected into the expansion membrane bag after the concrete air plug is poured, and the expansion membrane bag is expanded to seal between the concrete air plug and the inner side surface of the lining structure model.
8. The method for testing the compressed air reservoir in the coal roadway according to claim 7, wherein the air charging and discharging mechanism is used for charging and discharging air into the lining structure model, the air charging and discharging mechanism comprises a compressed air supply element, the compressed air supply element is connected with one end of an air inlet pipe, the other end of the air inlet pipe extends into the lining structure model through an air inlet hole, an air outlet pipe is fixed at the air outlet, the air outlet pipe is used for communicating the lining structure model with the external space, and valves are arranged on the air inlet pipe and the air outlet pipe.
9. The method for testing a compressed air storage in a coal roadway of claim 1, wherein the detecting elements in the surrounding rock block are a plurality of osmometers and stress gauges.
10. The coal roadway compressed air reservoir test method of claim 1, wherein a water tank is placed at the top of the overlying surrounding rock area, water is contained in the water tank, and a water port is formed in the bottom wall of the water tank to enable the overlying surrounding rock area to be permeated with water;
further, a heating element is arranged in the water tank.
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| CN202211573105.7A CN116025417A (en) | 2022-12-08 | 2022-12-08 | Coal roadway compressed air reservoir test method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116519489A (en) * | 2023-07-03 | 2023-08-01 | 中能建数字科技集团有限公司 | Model test device and method for simulating deformation and damage of surrounding rock of compressed air energy storage gas storage warehouse |
| CN117705603A (en) * | 2024-01-08 | 2024-03-15 | 山东科技大学 | Device and method for simulating surrounding rock degradation of compressed air energy storage warehouse through grouting reconstruction of abandoned roadway |
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2022
- 2022-12-08 CN CN202211573105.7A patent/CN116025417A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116519489A (en) * | 2023-07-03 | 2023-08-01 | 中能建数字科技集团有限公司 | Model test device and method for simulating deformation and damage of surrounding rock of compressed air energy storage gas storage warehouse |
| CN116519489B (en) * | 2023-07-03 | 2023-11-14 | 中能建数字科技集团有限公司 | Model test device and method for simulating deformation and damage of surrounding rock of compressed air energy storage gas storage warehouse |
| CN117705603A (en) * | 2024-01-08 | 2024-03-15 | 山东科技大学 | Device and method for simulating surrounding rock degradation of compressed air energy storage warehouse through grouting reconstruction of abandoned roadway |
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