CN117585971A - Similar material for simulating mountain tunnel surrounding rock and preparation method thereof - Google Patents
Similar material for simulating mountain tunnel surrounding rock and preparation method thereof Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 219
- 239000011435 rock Substances 0.000 title claims abstract description 80
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 239000010440 gypsum Substances 0.000 claims abstract description 50
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 50
- 239000002994 raw material Substances 0.000 claims abstract description 49
- 239000002023 wood Substances 0.000 claims abstract description 45
- 239000004576 sand Substances 0.000 claims abstract description 36
- 238000000034 method Methods 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000002156 mixing Methods 0.000 claims abstract description 12
- 239000002245 particle Substances 0.000 claims description 17
- 238000003756 stirring Methods 0.000 claims description 17
- 239000000428 dust Substances 0.000 claims description 15
- 238000007605 air drying Methods 0.000 claims description 10
- 238000004088 simulation Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 abstract description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 31
- 238000012360 testing method Methods 0.000 description 26
- 230000008569 process Effects 0.000 description 13
- 230000002035 prolonged effect Effects 0.000 description 8
- 239000002689 soil Substances 0.000 description 5
- 238000000465 moulding Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000000440 bentonite Substances 0.000 description 2
- 229910000278 bentonite Inorganic materials 0.000 description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Inorganic materials [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical group O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000007676 flexural strength test Methods 0.000 description 2
- 239000011507 gypsum plaster Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007580 dry-mixing Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000012744 reinforcing agent Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a preparation method of a similar material for simulating mountain tunnel surrounding rock, which comprises the steps of selecting and determining raw material components for preparing the similar material and the proportion thereof through simulating the physical and mechanical parameter range of the similar material of the surrounding rock, sequentially mixing the determined raw material components for preparing the similar material, pouring the mixture into a mould, standing for 3 hours after initial setting, demoulding, standing and naturally airing to obtain the material; the raw material components for preparing the similar material comprise 60-70 parts by weight of gypsum, 4-6 parts by weight of wood chips, 3-5 parts by weight of river sand and 25 parts by weight of water. The method for preparing the similar material is simple and convenient, the preparation cost is low, and the prepared similar material has the advantages of stable overall mechanics and wide adaptability of physical mechanics performance parameters.
Description
Technical Field
The invention relates to the field of surrounding rock materials of geotechnical engineering, in particular to a similar material for simulating mountain tunnel surrounding rock and a preparation method thereof.
Background
Mountain tunnels are typically located in hilly areas, where the surrounding rock environment is complex and highly irregular. In order to ensure the safety and stability of the tunnel, model experiments need to be carried out on the surrounding rock of the tunnel to study the mechanical properties, deformation and destruction mechanisms of the rock mass and the like. The method for simulating the mountain tunnel surrounding rock mainly comprises the steps of using natural soil and stone materials for indoor test or adopting a field sampling mode for outdoor test. However, the natural earth and stone materials have various sources and compositions, the mechanical properties and the physical properties of the natural earth and stone materials have great differences, and unified and reliable test results are difficult to obtain. Therefore, the mechanical properties and physical characteristics of the simulated material can be as close to those of the actual mountain tunnel surrounding rock as possible by controlling the formula and the preparation process of the material. When the similar materials are prepared, factors such as selection of the materials, determination of the proportion, simulation of the manufacturing process and the test environment are required to be considered, and the similar materials with certain similarity with the prototype surrounding rock are obtained by continuously adjusting the proportion of the materials and optimizing the preparation process, so that a certain technical basis is provided for design, construction and operation of mountain tunnel engineering, and the safety and reliability of tunnel engineering construction are further improved.
In the prior art, six raw materials of river sand, bentonite, barite powder, iron powder, lime and gypsum are adopted to prepare a mudstone similar material for simulating tunnel surrounding rock, four raw materials of fly ash, quartz sand, bentonite and water are adopted to prepare similar materials for simulating cross-fault tunnel model tests IV and V-class surrounding rock, and three raw materials of weak expansive soil, medium expansive soil and strong expansive soil are adopted to prepare similar materials for simulating expansive soil tunnel surrounding rock in the model test, but the raw materials in the patent have the problems of higher economic cost and inapplicability to large-scale simulation tests, and meanwhile, the raw materials are too many in variety and excessively complex in actual operation.
Therefore, how to provide a similar material, which can achieve the technical effects of simple and convenient preparation process and low preparation cost on the premise of simulating mountain tunnel surrounding rock, is a technical problem which needs to be solved by the technicians in the field.
Disclosure of Invention
In view of the problems existing in the prior art, the technical problem to be solved by the invention is to provide a surrounding rock similar material which is used for simulating mountain tunnel surrounding rock, and meanwhile, the similar material has the advantages of simple raw materials, simple and convenient preparation process and lower manufacturing cost.
In order to achieve the above purpose, the invention provides a preparation method of a similar material simulating mountain tunnel surrounding rock, which comprises the following steps:
s1, determining a physical and mechanical parameter range of a similar material of the simulated surrounding rock;
s2, determining raw material components for preparing similar materials through the physical and mechanical parameter range of the simulated surrounding rock similar materials and the proportion of the raw material components;
s3, mixing and stirring the determined raw material components for preparing the similar material according to the proportion of the raw material components to obtain the mixed material in a wet state, wherein the raw material components for preparing the similar material comprise: gypsum, wood chips, river sand and water;
s4, pouring the obtained mixed material in the wet state into a mold, fully compacting the mixed material in the wet state, then standing until the mixed material in the wet state reaches an initial setting state, continuously standing for 3 hours, performing demolding treatment, naturally standing and air-drying to obtain the similar material.
In a first aspect, the mixing and stirring the determined raw material components for preparing the similar material according to the proportion of the raw material components to obtain the mixed material in a wet state specifically includes: mixing gypsum, wood dust and river sand in proportion, and stirring to form a mixed material in a dry state; and then adding water into the obtained mixed material in a dry state, continuously stirring for 30-60 minutes, and obtaining the mixed material in a wet state.
In the first aspect, the raw material components for preparing the similar materials are mixed in parts by weight, and the gypsum, the wood chips, the river sand and the water are mixed in parts by weight: 60-70:4-6:3-5:25.
In the first aspect, the physical and mechanical parameter range of the surrounding rock similar material is determined by the actual engineering physical and mechanical parameters, the gravity similarity ratio and the geometric similarity ratio of the mountain tunnel surrounding rock to be simulated.
In a first aspect, the physical mechanical parameters of the simulated surrounding rock-like material include: density, modulus of elasticity, poisson's ratio, compressive strength and flexural strength.
In a first aspect, the gypsum is plaster of paris having a particle size of less than 100 μm.
In the first aspect, the river sand has a particle size of 0.25 to 0.5mm.
In a first aspect, the wood chips have a particle size of less than 200 μm.
The invention also provides a similar material for simulating the mountain tunnel surrounding rock, which is prepared by adopting the preparation method of the similar material for simulating the mountain tunnel surrounding rock, and comprises the following components:
60-70 parts of gypsum, 4-6 parts of wood dust and 3-5 parts of river sand.
The beneficial effects are that:
according to the invention, gypsum, wood chips, river sand and water are used as raw materials to prepare the similar material for simulating the mountain tunnel surrounding rock, so that the raw materials are wide in source, and the economic cost is reduced; the density, the elastic modulus, the poisson ratio, the compressive strength and the flexural strength of the prepared similar material can be adjusted by adjusting the proportion of the weight parts of the raw materials for preparing the similar material, so that the accurate simulation of mountain tunnel surrounding rock can be achieved; the wood chips in the raw materials of the similar materials can increase the plasticity of the similar materials in the process of preparing the similar materials, so that the obtained similar materials are more similar to the characteristics of the real tunnel surrounding rock to be simulated, meanwhile, the wood chips are lighter in weight and have water absorbability, the overall density of the similar materials can be reduced and the water absorbability of the similar materials in the process of preparing the similar materials can be adjusted by adding the wood chips into the similar materials, and the defects such as cracks in the real tunnel surrounding rock are simulated by adding the wood chips. The method has the advantages that the gypsum in the raw materials of the similar materials has a setting effect, the setting time of the similar materials can be changed by adjusting the addition amount of the gypsum in the process of preparing the similar materials, the setting time of the similar materials is prolonged, so that the development of a model test is more convenient, the setting time of the similar materials is prolonged, the mixed materials in the obtained wet state are poured into a mould due to the prolonged setting time, the problem that the mixed materials are insufficiently compacted in the mould due to the short setting time and the problem that moulding failure occurs due to time delay in the process of moulding is avoided, in addition, the setting time of the setting is prolonged, layered pouring can be carried out in the test process, the compactness of the similar materials is improved, the integral and local properties of the obtained similar materials are kept consistent, meanwhile, the method for preparing the simulated surrounding rock similar materials is simple and convenient, the molded by pouring the gypsum, the wood dust, the river sand and water into the mould after being uniformly mixed, and the molded similar materials are obtained through demoulding, standing and air drying, and the molded similar materials have the advantages of stable integral mechanical properties and wide adaptability of physical mechanical performance parameters.
Drawings
In order to more clearly illustrate the embodiments of the present description or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for preparing a similar material simulating mountain tunnel surrounding rock.
Detailed Description
The technical solutions of the embodiments of the present specification will be clearly and completely described below with reference to the drawings in the embodiments of the present specification, and it is apparent that the described embodiments are only some embodiments of the present specification, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments in this specification are within the scope of the invention.
Example 1
As shown in fig. 1, a preparation method of a similar material simulating mountain tunnel surrounding rock is provided in the first embodiment, and the preparation method of the similar material includes: s1, determining a physical and mechanical parameter range of a similar material of the simulated surrounding rock; s2, determining raw material components for preparing similar materials through the physical and mechanical parameter range of the simulated surrounding rock similar materials and the proportion of the raw material components; s3, mixing and stirring the determined raw material components for preparing the similar material according to the proportion of the raw material components to obtain the mixed material in a wet state, wherein the raw material components for preparing the similar material comprise: gypsum, wood chips, river sand and water; s4, pouring the obtained mixed material in the wet state into a mold, fully compacting the mixed material in the wet state, then standing until the mixed material in the wet state reaches an initial setting state, continuously standing for 3 hours, performing demolding treatment, naturally standing and air-drying to obtain the similar material.
According to the invention, gypsum, wood chips, river sand and water are used as raw materials to prepare the similar material for simulating the mountain tunnel surrounding rock, so that the raw materials are wide in source, and the economic cost is reduced; the density, the elastic modulus, the poisson ratio, the compressive strength and the flexural strength of the prepared similar material can be adjusted by adjusting the proportion of the weight parts of the raw materials for preparing the similar material, so that the accurate simulation of mountain tunnel surrounding rock can be achieved; the wood chips in the raw materials of the similar materials can increase the plasticity of the similar materials in the process of preparing the similar materials, so that the obtained similar materials are more similar to the characteristics of the real tunnel surrounding rock to be simulated, meanwhile, the wood chips are lighter in weight and have water absorbability, the overall density of the similar materials can be reduced and the water absorbability of the similar materials in the process of preparing the similar materials can be adjusted by adding the wood chips into the similar materials, and the defects such as cracks in the real tunnel surrounding rock are simulated by adding the wood chips. The method has the advantages that the gypsum in the raw materials of the similar materials has a setting effect, the setting time of the similar materials can be changed by adjusting the addition amount of the gypsum in the process of preparing the similar materials, the setting time of the similar materials is prolonged, so that the development of a model test is more convenient, the setting time of the similar materials is prolonged, the mixed materials in the obtained wet state are poured into a mould due to the prolonged setting time, the problem that the mixed materials are insufficiently compacted in the mould due to the short setting time and the problem that moulding failure occurs due to time delay in the process of moulding is avoided, in addition, the setting time of the setting is prolonged, layered pouring can be carried out in the test process, the compactness of the similar materials is improved, the integral and local properties of the obtained similar materials are kept consistent, meanwhile, the method for preparing the simulated surrounding rock similar materials is simple and convenient, the molded by pouring the gypsum, the wood dust, the river sand and water into the mould after being uniformly mixed, and the molded similar materials are obtained through demoulding, standing and air drying, and the molded similar materials have the advantages of stable integral mechanical properties and wide adaptability of physical mechanical performance parameters.
In some possible implementations, the mixing and stirring the determined raw material components for preparing the similar material according to the proportion of the raw material components to obtain the mixed material in the wet state specifically includes: mixing gypsum, wood dust and river sand in proportion, and stirring to form a mixed material in a dry state; adding water into the obtained mixed material in a dry state, continuously stirring for 30-60 minutes to obtain the mixed material in a wet state; the raw material components for preparing the similar materials are prepared from the following components in parts by weight: 60-70:4-6:3-5:25.
Specifically, the similar material is prepared by pouring the wet mixed material into a mold, and sequentially performing initial setting, demolding, natural standing and air drying, wherein in the preparation process of the wet mixed material, gypsum, wood dust and river sand are uniformly mixed to obtain the dry mixed material, so that the problem that the whole and local properties of the material are inconsistent due to uneven mixing among solid components in the subsequent gluing process of the dry mixed material by adding water is avoided, the properties of the obtained similar material are influenced, and large errors exist between the obtained similar material and the simulated surrounding rock performance. The wood chips are light in weight, the overall density of the similar materials can be reduced, the river sand density and the hardness are high, the physical and mechanical parameters of the similar materials can be adjusted, the wood chips are inserted between gypsum and river sand in the dry mixing process, and defects such as cracks in real surrounding rock can be simulated in the similar materials. In the process of adding water into the mixed material and stirring the mixed material in a dry state, gypsum and water are mixed to form slurry, wood dust has water absorption, the water content in the mixed material in a wet state can be adjusted, meanwhile, the gypsum water slurry and the wood dust can be adsorbed, the gypsum water slurry and the wood dust are adhered to the surface of river sand, the river sand is used as a framework, the gypsum is used as an adhesive, the wood dust is used as a reinforcing agent of the adhesive, and after the gypsum is solidified, the similar material is obtained. In the preparation process of the similar material, the weight proportion of gypsum, wood dust, river sand and water directly affects the physical and mechanical parameters of the similar material, and whether the similar material can successfully simulate and obtain the physical and mechanical parameters of the required surrounding rock is related.
In some possible implementations, the physical and mechanical parameter range of the surrounding rock similar material is determined by the actual engineering physical and mechanical parameters, the severe similarity ratio and the geometric similarity ratio of the mountain tunnel surrounding rock to be simulated; the physical and mechanical parameters of the simulated surrounding rock similar material comprise: density, modulus of elasticity, poisson's ratio, compressive strength and flexural strength.
Specifically, the density, the elastic modulus, the poisson ratio, the compressive strength, the flexural strength, the severe similarity ratio and the geometric similarity ratio of the similar materials for preparing the similar materials for simulating the surrounding rock are determined, and the weight part ratio between the raw material components of the similar materials for preparing the simulated surrounding rock is selected, and meanwhile, the similar materials for simulating the surrounding rock are prepared according to the selected raw material components of the similar materials for preparing the simulated surrounding rock.
In some possible implementations, the gypsum is a plaster of paris having a particle size of less than 100 μm; the grain diameter of the river sand is 0.25-0.5 mm; the particle size of the wood chips is less than 200 mu m.
Specifically, the gypsum particle size is smaller than 100 mu m, the river sand particle size is 0.25-0.5 mm, and the wood chip particle size is smaller than 200 mu m, so that the gypsum, the river sand and the wood chip can be uniformly mixed, the consistency of the whole and local properties of similar materials is improved, and the problem of uneven mixing caused by overlarge particle size of a certain component is avoided.
Example two
The second embodiment of the invention provides a similar material for simulating mountain tunnel surrounding rock, which is prepared by the preparation method in the first embodiment, and comprises the following components: 60-70 parts by weight of gypsum, 4-6 parts by weight of wood dust and 3-5 parts by weight of river sand; the gypsum is calcined gypsum, and the particle size of the calcined gypsum is smaller than 100 mu m; and/or the grain diameter of the river sand is 0.25-0.5 mm; and/or the particle size of the wood chips is less than 200 μm. It should be noted that, in the second embodiment, the similar material simulating the mountain tunnel surrounding rock is prepared by the preparation method according to the first embodiment, so the performance principle of the similar material simulating the mountain tunnel surrounding rock is not described herein, and the detailed description of the similar material simulating the mountain tunnel surrounding rock is omitted.
In order to further describe the technical solution of the present application in detail to support the technical problem to be solved by the present application, the following specific examples of the preparation method are described, as examples 1 to 4.
Gypsum: and calcined gypsum with the particle size smaller than 100 μm.
Wood chips: the particle size is less than 200 mu m.
River sand: the grain diameter is 0.25-0.5 mm.
Example 1
600g of gypsum, 40g of wood chips and 30g of river sand are mixed and stirred at 450 revolutions per minute until a dry state mixed material is formed;
250g of water is added into the obtained mixed material in a dry state, and stirring is continued for 45 minutes at 450 revolutions per minute to obtain the mixed material in a wet state;
pouring the obtained wet mixed material into a prefabricated mold, vibrating until the wet mixed material is sufficiently compact, then standing until the wet mixed material reaches an initial setting state, continuously standing for 3 hours, performing demolding treatment, naturally standing and air-drying for 3 days, and obtaining the similar material.
Example 2
700g of gypsum, 40g of wood dust and 30g of river sand are mixed, and the mixture is stirred at 450 revolutions per minute until a dry state mixed material is formed;
250g of water is added into the obtained mixed material in a dry state, and stirring is continued for 45 minutes at 450 revolutions per minute to obtain the mixed material in a wet state;
pouring the obtained wet mixed material into a prefabricated mold, vibrating until the wet mixed material is sufficiently compact, then standing until the wet mixed material reaches an initial setting state, continuously standing for 3 hours, performing demolding treatment, naturally standing and air-drying for 3 days, and obtaining the similar material.
Example 3
600g of gypsum, 60g of wood chips and 30g of river sand are mixed and stirred at 450 revolutions per minute until a dry state mixed material is formed;
250g of water is added into the obtained mixed material in a dry state, and stirring is continued for 45 minutes at 450 revolutions per minute to obtain the mixed material in a wet state;
pouring the obtained wet mixed material into a prefabricated mold, vibrating until the wet mixed material is sufficiently compact, then standing until the wet mixed material reaches an initial setting state, continuously standing for 3 hours, performing demolding treatment, naturally standing and air-drying for 3 days, and obtaining the similar material.
Example 4
600g of gypsum, 40g of wood chips and 50g of river sand are mixed and stirred at 450 revolutions per minute until a dry state mixed material is formed;
250g of water is added into the obtained mixed material in a dry state, and stirring is continued for 45 minutes at 450 revolutions per minute to obtain the mixed material in a wet state;
pouring the obtained wet mixed material into a prefabricated mold, vibrating until the wet mixed material is sufficiently compact, then standing until the wet mixed material reaches an initial setting state, continuously standing for 3 hours, performing demolding treatment, naturally standing and air-drying for 3 days, and obtaining the similar material.
Properties of similar materials from the simulated mountain tunnel surrounding rock prepared in examples 1-4 versus table 1:
density testing: reference to the chinese industry standard DZ/T0276.4-2015 section 4 of the petrophysical mechanical property test protocol: rock density test similar materials of the simulated surrounding rock prepared in examples 1 to 4 of the present invention were subjected to density tests, and the test results are shown in table 1.
Modulus of elasticity and poisson ratio test: reference to the chinese industry standard DZ/T0276.4-2015 section 19 of the petrophysical mechanical property test protocol: the elastic modulus and poisson ratio of similar materials of the simulated surrounding rock prepared in examples 1 to 3 of the present invention were tested by a resistance strain gauge method in a uniaxial compressive deformation test of rock, and the test results are shown in table 1.
Compressive strength test: reference to the chinese industry standard DZ/T0276.4-2015 section 18 of the petrophysical mechanical property test protocol: rock uniaxial compressive strength test the compressive strength test was carried out on similar materials of the simulated surrounding rock prepared in examples 1 to 3 of the present invention, and the test results are shown in table 1.
Flexural strength test: the flexural strength test was carried out on similar materials of simulated surrounding rock prepared in examples 1 to 4 of the present invention with reference to the test method in the national standard of China GB/T17669.3-1999 "determination of mechanical Properties of construction gypsum", and the test results are shown in Table 1.
Table 1 performance comparison
As shown in table 1, comparative examples 1 and 2 show that the gypsum content in the similar materials is increased, the elastic modulus of the similar materials is obviously increased, the poisson ratio is obviously reduced, the compressive strength and the flexural strength are increased, and the density reduction change amount is small; as can be seen from comparative examples 1 and 3, the wood chip content in the similar material is increased, the density and elastic modulus of the similar material are remarkably reduced, and the poisson ratio, compressive strength and flexural strength are hardly changed; as is clear from comparative examples 1 and 4, the river sand content in the similar material is increased, the density and elastic modulus of the similar material are remarkably increased, the poisson ratio is remarkably reduced, and the compressive strength and the flexural strength are hardly changed. In summary, the content of gypsum mainly affects the elastic modulus, poisson ratio, compressive strength and flexural strength of similar materials; the wood chip content mainly affects the density and the elastic modulus of similar materials; the content of river sand mainly influences the density, the elastic modulus and the poisson ratio of similar materials; the raw material components for preparing the simulated surrounding rock similar material are simple, the method for preparing the similar material is simple and convenient, the addition amount of the raw material components can be adjusted within the proportion range of the raw material components in the preparation process, the similar material simulating surrounding rock with different properties can be obtained, and the application range of the simulated surrounding rock similar material is enlarged.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.
Claims (10)
1. The preparation method of the similar material simulating mountain tunnel surrounding rock is characterized by comprising the following steps of:
s1, determining a physical and mechanical parameter range of a similar material of the simulated surrounding rock;
s2, determining raw material components for preparing similar materials through the physical and mechanical parameter range of the simulated surrounding rock similar materials and the proportion of the raw material components;
s3, mixing and stirring the determined raw material components for preparing the similar material according to the proportion of the raw material components to obtain the mixed material in a wet state, wherein the raw material components for preparing the similar material comprise: gypsum, wood chips, river sand and water;
s4, pouring the obtained mixed material in the wet state into a mold, fully compacting the mixed material in the wet state, then standing until the mixed material in the wet state reaches an initial setting state, continuously standing for 3 hours, performing demolding treatment, naturally standing and air-drying to obtain the similar material.
2. The method for preparing the similar material simulating mountain tunnel surrounding rock according to claim 1, wherein the step of mixing and stirring the determined raw material components for preparing the similar material according to the proportion of the raw material components to obtain the mixed material in a wet state specifically comprises the following steps: mixing gypsum, wood dust and river sand, and stirring to form a mixed material in a dry state; and then adding water into the obtained mixed material in a dry state, continuously stirring for 30-60 minutes, and obtaining the mixed material in a wet state.
3. The method for preparing the similar material simulating mountain tunnel surrounding rock according to claim 2, wherein the raw material components for preparing the similar material are prepared from the following raw materials in parts by weight: 60-70:4-6:3-5:25.
4. A method for preparing a similar material simulating mountain tunnel surrounding rock as defined in claim 3, wherein: the physical and mechanical parameter range of the surrounding rock simulation similar material is determined by the actual engineering physical and mechanical parameters, the severe similarity ratio and the geometric similarity ratio of the mountain tunnel surrounding rock to be simulated.
5. The method for preparing a similar material simulating mountain tunnel surrounding rock according to claim 4, wherein the physical and mechanical parameters of the similar material simulating mountain tunnel surrounding rock include: density, modulus of elasticity, poisson's ratio, compressive strength and flexural strength.
6. The method for preparing the similar material for simulating mountain tunnel surrounding rock, as claimed in claim 5, is characterized in that: the gypsum is calcined gypsum, and the particle size of the calcined gypsum is smaller than 100 mu m.
7. The method for preparing the similar material for simulating mountain tunnel surrounding rock according to claim 6, wherein the method comprises the following steps: the grain diameter of the river sand is 0.25-0.5 mm.
8. The method for preparing the similar material for simulating mountain tunnel surrounding rock according to claim 7, wherein the method comprises the following steps: the particle size of the wood chips is less than 200 mu m.
9. The similar material for simulating mountain tunnel surrounding rock is characterized by being prepared by adopting the preparation method of the similar material for simulating mountain tunnel surrounding rock according to any one of claims 1-5, and the similar material comprises the following components:
60-70 parts of gypsum, 4-6 parts of wood dust and 3-5 parts of river sand.
10. A similar material for simulating mountain tunnel surrounding rock as defined in claim 9, wherein:
the gypsum is calcined gypsum, and the particle size of the calcined gypsum is smaller than 100 mu m;
and/or the number of the groups of groups,
the grain diameter of the river sand is 0.25-0.5 mm;
and/or the number of the groups of groups,
the particle size of the wood chips is less than 200 mu m.
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