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Preparation method of similar material suitable for geophysical dynamic model test

A technology similar to materials and dynamic models, applied in teaching models, educational tools, instruments, etc., can solve problems such as the difficulty of realizing geophysical dynamic model tests, achieve low raw material costs, improve simulation accuracy, and simplify the preparation process.

Inactive Publication Date: 2019-06-07
NORTH CHINA INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the shortcomings of the above-mentioned existing similar materials, the present invention provides a method for preparing similar materials suitable for geophysical dynamic model tests that can quantitatively satisfy both mechanical similarity conditions and electrical similarity conditions, so as to solve the problem that conventional similar materials are difficult to achieve earth Problems with Physical Dynamic Model Tests

Method used

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  • Preparation method of similar material suitable for geophysical dynamic model test
  • Preparation method of similar material suitable for geophysical dynamic model test
  • Preparation method of similar material suitable for geophysical dynamic model test

Examples

Experimental program
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Embodiment 1

[0031] In order to illustrate the preparation method of the method of the present invention, a similar material preparation process for a certain model test is given.

[0032] In order to reduce gas hazards in coal mines, a high drainage roadway is usually arranged above the coal seam to extract gas. In order to achieve the optimal drainage effect, the high drainage roadway needs to be arranged in the fissure zone generated by the overlying strata after the coal seam is mined. In order to determine the layout position of the high pumping roadway in a certain mine, it is planned to use the time-lapse high-density electrical method to detect the range of the fracture zone. Before the actual measurement, a model test was carried out first, and the preparation process of similar materials is as follows:

[0033] Step 1) Establish a geological and geophysical model: divide the prototype into 53 pieces, each of which is layered, and determine the thickness, tensile strength, compre...

Embodiment 2

[0047] In order to illustrate the effect of the method of the present invention, the model test effect of the model made in Example 1 is given.

[0048] figure 2 before coal mining figure 1 The model inverts the resistivity profile, and the resistivity is between 5 and 100Ω·m, distributed in layers. Affected by the volume effect and equivalence problems, the inversion resistivity is a comprehensive reflection of the resistivity of each layer of the model, and the inversion resistivity of the model is consistent with the design resistivity value on the whole.

[0049] image 3 , 4 , 5 are schematic diagrams attached to the model photo for the resistivity profile, the resistivity change rate profile and the resistivity change rate profile when mining to x=1.9m, respectively. Depend on image 3 , 4 It can be seen that after the coal seam is mined, the overlying stratum is deformed and damaged, and the resistivity of the deformed and damaged area increases to a maximum of 5...

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Abstract

The invention relates to a preparation method of similar materials suitable for geophysical dynamic model test,wherein the similar materials adopt sand, gypsum, calcium carbonate, water, sodium chloride and mica powder, wherein the use amount of the sand, gypsum, calcium carbonate and water is determined by prototype mechanical parameters, the use amountof the sodium chloride is co-determined by the electrical parameters of the prototype and the use amountof the sand, gypsum, calcium carbonate and water, and the preparation method comprises the following steps: establishing geo-geophysica model-> determining similar constants-> calculating the use amount of sand, calcium carbonate, gypsum and water-> converting the size of each block of prototype into the size of each block of model according to geometric similarity constants-> determining the proportion of sand, calcium carbonate, gypsum and water used in each block of the model-> determining the quality of sand, calcium carbonate, gypsum and water in each block of the model-> calculating the use amount of sodium chloride-> weighing the quality of sand, calcium carbonate, gypsum, sodium chloride and water required for each model->stirring-> module-filling-> module disassembling->airdrying at room temperature, and a similar material model can be obtained.

Description

technical field [0001] The invention relates to the fields of geology and exploration geophysics, in particular to a method for preparing similar materials suitable for geophysical dynamic model tests. Background technique [0002] Model test is an important method in geophysical research, in which the selection and preparation of similar materials is the key. Traditional geophysical model test methods include water tank method and soil (sand) tank method, using water or soil (sand) as a uniform medium to simulate uniform surrounding rock, using metal and graphite to simulate low-resistivity anomalies, and using epoxy resin and organic Glass, etc. simulates high resistivity anomalous bodies. In recent years, some improved geophysical model test methods have been developed. For example: Jiang Zhihai of China University of Mining and Technology used salt water as a similar material to establish a physical model for the full-space transient electromagnetic advanced detection;...

Claims

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Application Information

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IPC IPC(8): G09B25/06
Inventor 李飞程久龙康庆涛陈绍杰潘建旭
Owner NORTH CHINA INST OF SCI & TECH