CN107101867B - Coal bed karst collapse column water inrush model test analog simulation material and preparation method thereof - Google Patents
Coal bed karst collapse column water inrush model test analog simulation material and preparation method thereof Download PDFInfo
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- CN107101867B CN107101867B CN201710379327.8A CN201710379327A CN107101867B CN 107101867 B CN107101867 B CN 107101867B CN 201710379327 A CN201710379327 A CN 201710379327A CN 107101867 B CN107101867 B CN 107101867B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
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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
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
- G01N2001/386—Other diluting or mixing processes
Abstract
The invention discloses a coal seam karst collapse column water inrush model test analog simulation material and a preparation method thereof, wherein the material comprises the following components in parts by weight: 1 part of quartz sand, 0.09 part of putty powder, 0.10 part of heavy stone crystal powder, 0.13 part of vaseline or petroleum resin, 0.09 part of blending water and 0.02 part of carbon black. The method is used for simulating the coal seam collapse column type water inrush characteristics under different mechanical characteristic conditions, and can realize excavation collapse water inrush under high mechanical parameters and simulate the water seepage and disturbance water inrush characteristics of the coal seam collapse column under low mechanical parameters; the strength, permeability and stability of the material can be adjusted in a large range, and a karst collapse column coal bed in a large strength range can be simulated. The invention also provides the proportion and the preparation method thereof.
Description
Technical Field
The invention relates to a coal seam karst collapse column water inrush model test analog simulation material and a preparation method thereof.
Background
The coal bed karst collapse column is a special geological phenomenon found in North China. The existence of the karst collapse column not only destroys the normal occurrence of the coal bed, but also has the water guide collapse column which is the great water damage threat of mine production. The karst collapse column belongs to a hidden vertical structure, and water inrush caused by the karst collapse column has the characteristics of concealment, outburst, natural relation with karst water and the like, and is extremely harmful to coal mine safety production and local people life.
The geomechanical model test can simulate the deformation and damage characteristics of the surrounding rock of the roadway under various geological conditions and mining conditions, visually reflect the physical and mechanical phenomena of the researched system, and make up the defects of theoretical analysis and field test. On the premise of meeting the similarity principle, the implementation effect of the on-site scheme can be more accurately tested in advance, and the safety and economic problems caused by unreasonable scheme after engineering construction are effectively avoided. The model test has unique superiority, is widely applied in the geotechnical and mining engineering world at home and abroad, researches the design of underground engineering and the optimization of a construction method through a large number of geomechanical model tests, explores the mechanical law of the construction process and becomes a necessary means for developing the underground engineering research
However, the existing underground engineering model test has many obvious defects, especially in the aspect of research and development of similar materials, most of the tests only pay attention to similar simulation in the aspect of physical properties, and the mechanical properties of the materials are rarely considered. Although a few similar tests consider the fluid-solid coupling effect, the model test is difficult to simulate the mechanical properties of soft rock under complex geological conditions, so that the experimental result is inconsistent with the actual condition. Research and development of similar materials of surrounding rocks under the condition of high mechanical parameters are common, but the proportion of similar materials of coal beds under the condition of low stress is quite rare. For the large-scale karst collapse column lagging water inrush of the coal bed, few model tests can be successfully simulated, and corresponding research results cannot be obtained.
Disclosure of Invention
The invention aims to solve the problems, provides a similar simulation material for a water inrush model test of a coal seam karst collapse column and a preparation method thereof, and is particularly suitable for a hysteresis water inrush model test of a large karst collapse column of a coal seam.
In order to achieve the purpose, the invention adopts the following technical scheme:
a coal seam karst collapse column water inrush model test simulation material comprises the following components in parts by weight: 1 part of quartz sand, 0.09 part of putty powder, 0.10 part of barite powder, 0.13 part of vaseline or petroleum fat, 0.09 part of blending water and 0.02 part of carbon black.
The particle size of the quartz sand is less than 9mm, and the grading is uniform.
The fineness of the gypsum powder is 400-600 meshes
The fineness of the talcum powder is 800-1400 meshes.
The mixing water is tap water.
The preparation method of the similar material comprises the following steps:
1) firstly, weighing quartz sand, putty powder, barite powder, vaseline and mixing water according to a determined ratio according to physical and mechanical parameters of a karst collapse column coal bed under an engineering geological condition to be simulated;
2) mixing and uniformly stirring three fine materials of quartz sand, putty powder and barite powder, standing, sieving out larger cemented particles, adding weighed mixing water, and fully stirring;
3) heating vaseline to 50-65 ℃ to melt the vaseline into liquid;
4) mixing liquid vaseline with the material obtained in the step 2), adding carbon black, fully stirring, and cooling at room temperature to obtain the coal bed similar material for the model test.
The working principle of the invention is as follows:
the putty powder and the quartz sand are used as aggregates to adjust the material weight; the barite powder is used as a cementing agent, and the carbon black is used as a coloring agent, so that the simulation of the coal seam characteristics is realized; vaseline is used as a water-blocking agent to adjust the permeability of materials, and is also used as a plastic cementing agent of the materials, so that the method is used for simulating the water inrush characteristics of the coal seam collapse column under different mechanical property conditions, and can realize the excavation collapse water inrush under high mechanical parameters and simulate the water seepage and disturbance water inrush characteristics of the coal seam collapse column under low mechanical parameters.
Compared with the prior art, the invention has the beneficial effects that:
(1) the simulation method can simulate the fluid-solid coupling characteristic of the coal seam collapse column under the seepage action under the condition of keeping the similar material to have certain strength;
(2) the invention can design a test model according to the geological condition of the actual coal bed on the premise of not influencing the overall property of the material;
(3) the method can simulate the coal seam of the collapse column with various categories and permeability coefficients while regulating and controlling the water physical property and the mechanical property, and simulate the mechanical property and the seepage property which can be deduced along with time;
(4) the method can better simulate the fluid-solid-coupling effect of the coal seam of the collapse column under the condition of lower physical mechanical parameters;
(5) the method has wide application range, can be used for simulating the water inrush characteristics of the coal bed karst collapse column under different mechanical property conditions, can realize the water inrush of the excavated base plate under high mechanical parameters, and can simulate the water seepage and disturbance water inrush characteristics of the coal bed collapse column under lower mechanical parameters; the strength, permeability and stability of the material can be adjusted in a large range, and the collapse column coal bed in a large strength range can be simulated.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a stress-strain plot of a sample of material under uniaxial compression conditions.
The specific implementation mode is as follows:
the invention is further described with reference to the following figures and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As introduced by the background art, most of the prior art only focuses on the similar simulation of physical characteristics, but rarely considers the insufficiency of mechanical characteristics of materials, and in order to solve the technical problems, the application provides the coal bed similar simulation material for the large-scale karst collapse column lagging water inrush model test of the coal bed.
The composition consists of the following components in parts by weight: 1 part of quartz sand, 0.09 part of putty powder, 0.10 part of barite powder, 0.13 part of vaseline (petroleum fat), 0.09 part of blending water and 0.02 part of carbon black.
The grain size of the quartz sand is less than 9mm, and the grading is uniform.
The fineness of the gypsum powder is 400-mesh and 600-mesh
The fineness of the talcum powder is 800-1400 meshes.
The mixing water is tap water.
Vaseline (petrolatum) is a transparent and nontoxic medicinal vaseline.
According to the similar material for simulating the coal seam of the large karst collapse column in the coal seam lagging water bursting model test, barite powder is used as a cementing agent, vaseline conditioning agent is used as a plastic cementing agent, so that the material has a certain stability coefficient after meeting water, the seepage property of the material can be ensured, and the permeability can be enhanced; vaseline is adopted to adjust the water physical property of the material, and the permeability of the material can also be adjusted;
the quartz sand and the putty powder are used as aggregates, the weight, the strength, the elastic modulus and the like of the material are adjusted, the main parameter range of the material is shown in table 1, and the stress-strain curve under the uniaxial compression condition is shown in fig. 1.
TABLE 1
The invention relates to a similar material for simulating a karst collapse column coal bed in a large karst collapse column hysteresis water inrush model test of a coal bed, which researches a technical scheme and a preparation method of the similar material for simulating the collapse column coal bed in an available model test, realizes the similar model test of the coal bed collapse column water inrush, solves the problem that the similar test is difficult to conform to the real geological condition under the condition of lower mechanical parameters, and can simulate the measurement and damage mechanism of the strength and permeability of the material under the same geological condition, so that the obtained experimental result can better guide the practical engineering application.
The invention selects quartz sand, putty powder, barite powder, vaseline (petroleum resin), mixing water and carbon black as the components of the similar material of the coal seam of the collapse column. The barite powder is used as a main cementing agent, and the vaseline is used as a plastic cementing agent, so that the similar material of the coal bed can have strength and certain plasticity, cannot be dissolved in water in an experiment, and can bear certain pressure. Under the condition of lower mechanical parameters, the strength reduction and permeability enhancement of similar materials under the action of water power can be realized, and finally, a water inrush channel is formed; quartz sand and putty powder are used as aggregate, and the strength, the cohesion, the internal friction angle and the like of similar materials are simulated by adjusting the specific gravity. The content of the vaseline (petroleum fat) can adjust the bonding strength of the material and also can adjust the permeability coefficient of similar materials, so that the physical and mechanical properties and the water physical properties of the material can meet the experimental requirements; vaseline can adjust the permeability, strength and elastic modulus of similar materials, the strength and elastic modulus of the materials are adjusted in a way opposite to those of barite powder along with the increase of the content, and the mechanical property and the water physical property of the materials can be changed by adjusting the proportion of the two materials.
The fineness of the gypsum powder used in the invention is 700 meshes; the grain size of the quartz sand is less than 7mm, and the grading is uniform; the fineness of the talcum powder is 1000 meshes; the vaseline is white nontoxic medical-grade vaseline.
Similar material for preparing simulated fault in large-scale coal seam collapse column hysteresis water inrush model test
The raw materials comprise: 1 part of quartz sand, 0.09 part of putty powder, 0.10 part of barite powder, 0.13 part of vaseline (petroleum fat), 0.09 part of blending water and 0.02 part of carbon black.
The preparation method comprises the following steps:
1) firstly, weighing quartz sand, putty powder, barite powder, vaseline and mixing water according to a determined ratio according to physical and mechanical parameters of a collapse column coal seam of an engineering geological condition to be simulated;
2) mixing and uniformly stirring three fine particle materials of quartz sand, putty powder and barite powder, standing for half an hour, screening out larger cemented particles, adding weighed mixing water, and fully stirring;
3) heating vaseline to 50-65 ℃ to melt the vaseline into liquid;
4) mixing liquid vaseline with the material obtained in the step 2), adding carbon black, fully stirring, and cooling for 5-10 min at room temperature to obtain the coal bed similar material for the model test.
The stress strain of the obtained material under the uniaxial compression condition is shown in figure 1, the change process of the strain along with the increase of the load of the test piece in the loading process is reflected, and the requirements of similar conditions on similar materials are met.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (4)
1. The utility model provides a coal seam karst collapse post gushes out water model test analog simulation material which characterized by: the composition comprises the following components in parts by weight: 1 part of quartz sand, 0.09 part of putty powder, 0.10 part of barite powder, 0.13 part of vaseline, 0.09 part of blending water and 0.02 part of carbon black;
putty powder and quartz sand are used as aggregates, barite powder is used as a cementing agent, carbon black is used as a coloring agent, and vaseline is used as a water-blocking agent and is also used as a plastic cementing agent.
2. The coal seam karst collapse column water inrush model test simulation material as claimed in claim 1, wherein: the particle size of the quartz sand is less than 9mm, and the grading is uniform.
3. The coal seam karst collapse column water inrush model test simulation material as claimed in claim 1, wherein: the mixing water is tap water.
4. The method for preparing the coal seam karst collapse column water inrush model test simulation material as claimed in any one of claims 1 to 3, wherein the method comprises the following steps: the method comprises the following steps:
1) firstly, weighing quartz sand, putty powder, barite powder, vaseline and mixing water according to a determined ratio according to physical and mechanical parameters of a karst collapse column coal bed under an engineering geological condition to be simulated;
2) mixing and uniformly stirring three fine materials of quartz sand, putty powder and barite powder, standing, sieving out larger cemented particles, adding weighed mixing water, and fully stirring;
3) heating vaseline to 50-65 ℃ to melt the vaseline into liquid; the mechanical property and the water-physical property of the material are changed by changing the proportion of the vaseline and the barite powder;
4) mixing liquid vaseline with the material obtained in the step 2), adding carbon black, fully stirring, and cooling at room temperature to obtain the coal bed similar material for the model test.
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| CN111781051B (en) * | 2020-07-09 | 2021-06-25 | 中国石油大学(北京) | Artificial conglomerate core based on lithology and permeability control and preparation method and application thereof |
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