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Similar materials used in coal and gas outburst simulation experiments and their preparation methods

A technology of gas outburst and simulation experiments, applied in the field of materials, can solve the problems of remote simulation experiments, low similarity of physical and mechanical properties, and failure to take into account outstanding mechanical properties and adsorption properties of materials, etc., to achieve low cost, easy purchase of raw materials, and consistent satisfaction sexual effect

Active Publication Date: 2015-09-23
CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these outburst simulation materials can carry out outburst simulation experiments, they are far away from the simulation experiments of similar materials for coal and gas outbursts. The main reason is that the production method does not take into account the mechanical properties and adsorption properties of the outburst materials, and their physical and mechanical properties are similar to raw coal. to a lesser extent

Method used

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Effect test

preparation example Construction

[0027] The method for preparing similar materials for the coal and gas outburst simulation experiment of this embodiment includes the following steps:

[0028] a. Mixing of raw materials: mix the components of the raw materials evenly according to the set weight ratio;

[0029] b. Cold pressing molding: put the mixture into the mold three times: firstly put 25-35% of the total amount, pre-press molding according to 15-25% of the set molding pressure, and then stir the molding surface before loading 25-35% of the total amount is also pre-pressed at 15-25% of the molding pressure, then the molding surface is stirred again, and finally the remaining mixture is loaded, and finally pressurized to the set molding pressure and kept at a certain pressurization time;

[0030] c. Drying after demoulding treatment to prepare similar materials for coal and gas outburst simulation experiments;

[0031] In this embodiment, the mixture is loaded into the molded coal mold three times: first...

Embodiment 1

[0034] Similar materials for the coal and gas outburst simulation experiment in this embodiment, the raw materials include the following components by weight percentage: 6% cement, 3.5% sand, 0.88% activated carbon, 8.25% water, and the balance of pulverized coal is added to 100%.

[0035] In this embodiment, the pulverized coal is a mixture of two pulverized coals with different particle sizes, and the weight ratio of the two pulverized coals is 1:1.

[0036] In this embodiment, the pulverized coal is a mixture of pulverized coal with a particle size of 30 mesh and 50 mesh.

[0037] In this embodiment, the particle size of the sand is 80 mesh, and the activated carbon is granular activated carbon.

[0038] In this embodiment, the cement is 425% cement whose 28-day compressive strength reaches 32.5 MPa.

[0039] The method for preparing similar materials for the coal and gas outburst simulation experiment of this embodiment includes the following steps:

[0040] Mixing of ra...

Embodiment 2

[0051] Similar materials for the coal and gas outburst simulation experiment in this embodiment, the material raw materials include the following components by weight percentage: 2% cement, 6.5% sand, 0.92% activated carbon, 9.25% water, and the balance of pulverized coal is added to 100%.

[0052] In this embodiment, the pulverized coal is a mixture of pulverized coal with a particle size of 20 mesh and 40 mesh, and the ratio of the two pulverized coal is 1:1.

[0053]In this embodiment, the particle size of the sand is 60 mesh, and the activated carbon is granular activated carbon.

[0054] In this embodiment, the cement is 425% cement whose 28-day compressive strength reaches 32.5 MPa.

[0055] The method for preparing similar materials for the coal and gas outburst simulation experiment of this embodiment includes the following steps:

[0056] Mixing of raw materials: Weigh 20 mesh and 80 mesh pulverized coal according to the ratio of 1:1, mix the pulverized coal of two d...

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Abstract

The invention discloses a similar material for coal and gas outburst simulation experiments and a preparation method thereof. Pulverized coal is used as aggregate, cement is used as adhesive, sand, water and activated carbon are used as auxiliaries, a mixture of two pulverized coal with different granularities is selected, and the requirement for simulating raw coal in mechanical experiments can be met. The material can take mechanical property and adsorption performance of an outburst material in consideration and has a high similarity level in the physical mechanical property, the similarity of physical mechanical property and gas adsorption performance between the similar material and III-V type destroyed coal can be guaranteed by regulating the proportion of auxiliaries. The material is simple in manufacture process, can be used for manufacturing a large-sized outburst similar material, and can meet the consistency between coal and gas outburst experiment phenomenon and actual coal and gas outburst. Furthermore, the material has the advantages of simple and easily available raw materials, low cost, environmental friendliness and no environmental pollution.

Description

technical field [0001] The invention relates to a material, in particular to a similar material suitable for large-scale coal and gas outburst similar material simulation experiments and a preparation method thereof. Background technique [0002] The simulation experiment of similar materials for coal and gas outburst is one of the important means to study the outburst mechanism. At present, the similar materials and preparation techniques used by scholars at home and abroad when carrying out coal and gas outburst simulation experiments mainly include: [0003] ① Crushed coal of a certain size is cold-pressed without adding cement; [0004] ②The crushed coal of a certain size is cold-pressed under the condition of only adding water; [0005] ③ The crushed coal of a certain size is cold-pressed with the addition of cement or gypsum and other cement; [0006] ④ Crushed coal of a certain size is hot-pressed with the addition of binders such as pitch, coal tar or rosin. Alth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B14/06
Inventor 戴林超文光才张淑同王波孙海涛杨慧明苗法田马代辉
Owner CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD