CN109859608A - The preparation method of analog material suitable for geophysics transient model testing - Google Patents
The preparation method of analog material suitable for geophysics transient model testing Download PDFInfo
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Abstract
The present invention relates to the preparation methods for the analog material for being suitable for geophysics transient model testing, analog material uses sand, gypsum, calcium carbonate, water, sodium chloride and mica powder, wherein sand, gypsum, the dosage of calcium carbonate and water is determined by prototype mechanics parameter, the dosage of sodium chloride is by prototype electrical parameter, sand, gypsum, the dosage of calcium carbonate and water codetermines, preparation method is the following steps are included: establish geologic geophysical model → determine affinity constant → calculating sand, calcium carbonate, the dosage of gypsum and water → size for being each piece of model by each piece of prototype of size conversion according to geometric similarity constant → determines each piece of model of sand, calcium carbonate, gypsum, each piece of model of the usage ratio of water → determine of sand, calcium carbonate, quality → calculating sodium chloride dosage → sand needed for weighing each block models of gypsum and water , calcium carbonate, gypsum, sodium chloride and water quality → stirring → die-filling → demoulding → air drying, required similar material model can be obtained.
Description
Technical field
The present invention relates to geology and exploration geophysics field, more particularly to a kind of geophysics dynamic model that is suitable for try
The preparation method for the analog material tested.
Background technique
Model test is the important method of geophysical research, and wherein the selection and preparation of analog material are crucial.Tradition
Geophysical model test method includes sink method and native (sand) channel process, does uniform dielectric with water or soil (sand) to simulate and uniformly enclose
Rock, simulates low-resistivity anomalous body with metal and graphite etc., simulates high resistivity anomalous body with epoxy resin and organic glass etc..
Some improved geophysical model test methods are developed in recent years.Such as: sea China Mining University Jiang Zhi etc. uses salt water
As analog material, total space transient electromagnetic forward probe physical model is established；Shandong University Nie Li it is superfine with silty clay,
Rubble and cement have made polynary geophysical field comprehensive survey model as analog material.The above analog material is mainly realized
Be geophysics static models simulation.
Geophysics transient model testing needs cast material while meeting mechanics condition of similarity and electrical condition of similarity, makes
The deformation failure of model and the deformation failure of practical rock stratum meet certain condition of similarity, while the resistivity of model and practical rock
Layer resistivity also meets certain condition of similarity.Currently, using the sand of different ratio, gypsum, calcium carbonate and water as similar material
Material carries out Mechanical Model Test method comparative maturity；Geophysical model test is carried out with sink and native (sand) slot etc. also to compare
It is more mature.But there are no analog material and preparation sides that energy simultaneous quantitative meets mechanics condition of similarity and electrical condition of similarity
Method, it is difficult to meet the needs of geophysics transient model testing.
Summary of the invention
For the deficiency of above-mentioned existing analog material, the present invention provides one kind can meet mechanics condition of similarity with simultaneous quantitative
With the preparation method of the analog material suitable for geophysics transient model testing of electrical condition of similarity, to solve conventional phase
The problem of being difficult to realize geophysics transient model testing like material.
To achieve the above object, the technical solution used in the present invention is: being suitable for geophysics transient model testing
The preparation method of analog material, analog material use sand, gypsum, calcium carbonate, water, sodium chloride and mica powder, wherein sand, stone
The dosage of cream, calcium carbonate and water is determined that the dosage of sodium chloride is by prototype electrical parameter, sand, gypsum, carbon by prototype mechanics parameter
The dosage of sour calcium and water codetermine, preparation method the following steps are included:
Step 1) establishes geologic geophysical model: by prototype piecemeal, determine piecemeal quantity, each piece of size positions,
Tensile strength, compression strength, density and resistivity；The piecemeal quantity and each piece of size positions need true according to experiment
Fixed, each piece of the tensile strength and compression strength are determined according to prototype rock mechanics experiment result, each piece of the electricity
Resistance rate is determined according to prototype resistivity logging data；
Step 2) determines affinity constant using existing method: according to prototype size, mechanics parameter and die size, determining several
What affinity constant, bulk density affinity constant, intensity affinity constant and elastic affinity constant；
Step 3) calculates the dosage of sand, calcium carbonate, gypsum and water: according to geometric similarity constant, by each piece of prototype
The size that size conversion is each piece of model；Using existing method, according to mechanics affinity constant and mechanics parameter, determine that model is every
The usage ratio of one piece of sand, calcium carbonate, gypsum and water；According to each piece of model of size and sand, calcium carbonate, gypsum and
The usage ratio of water determines each piece of model of sand quality, calcium carbonate quality, the quality of gypsum quality and water；
Step 4) calculates sodium chloride dosage: each piece of sand mass percentage S, gypsum quality percentage composition G are calculated,
Estimate model drying time t；By the electricalresistivityρ of each block models, sand mass percentage S, gypsum quality percentage composition G and
Drying time t brings formula C=exp (0.91 × (- 9.37+0.22S-1.2G+1.73ln (0.25t)-ln (ρ))) into, obtains every
One piece of concentration of sodium chloride solution C；Each piece of concentration of sodium chloride solution C is obtained each piece multiplied by the quality of each block models water
The quality of the sodium chloride of model；The sand mass percentage be sand quality divided by sand, calcium carbonate and gypsum quality it
With；The gypsum quality percentage composition is gypsum quality divided by the sum of sand, calcium carbonate and gypsum quality；
Step 5) ingredient: sand quality needed for weighing each block models of step 3) calculating with electronic balance, carbonic acid are calcareous
Amount, gypsum quality；Sodium chloride quality needed for weighing each block models of step 4) calculating with electronic balance；Step is weighed with measuring cup
3) quality of water needed for each block models calculated；
Step 6) stirring: obtaining sodium chloride solution for sodium chloride into the water, start blender, according to gypsum, calcium carbonate,
Material is poured slowly into 3~5min of stirring in blender by the sequence of sand and sodium chloride solution, is stirred evenly；
Step 7) is die-filling: the material stirred evenly being packed into mold, spreads one layer of thin cloud on the interface between every piece of model
Female powder；
Step 8) demoulding: demoulding after for 24 hours~48h model substantially dry；
Continue drying 15~30 days under step 9) room temperature, required similar material model can be obtained.
Further, the prototype piecemeal in step 1), according to each piece of experiment needs to be stratiform or any irregular shape
Shape.
Further, mechanics parameter described in step 2) starves tensile strength, compression strength and density.
Further, mold described in step 2) needs to be two-dimensional mold or three-dimensional mould according to experiment.
Further, mechanics affinity constant described in step 3) includes bulk density affinity constant, intensity affinity constant and bullet
Property affinity constant.
Further, model drying time described in step 4) is model drying time in step 8).
Compared with the conventional method, the method for the present invention has the advantage that as follows with effect:
(1) similar material model that the present invention makes can meet mechanics condition of similarity and electrically similar item with simultaneous quantitative
Part solves the problems, such as that conventional analog material is difficult to realize geophysics transient model testing.
(2) dosage of sodium chloride has comprehensively considered prototype electrical parameter, sand, gypsum, calcium carbonate and water in the present invention
Dosage, and be it is quantitative, substantially increase the simulation precision of model electrical parameter.
(3) present invention makes similar material model, raw material using sand, gypsum, calcium carbonate, water, sodium chloride and mica powder
At low cost, preparation process is simple.
Detailed description of the invention
Fig. 1 is similar material model figure.
Fig. 2 is resistivity section figure before Fig. 1 is adopted.
Fig. 3 is resistivity section figure when adopting to x=1.9m.
Fig. 4 is change in resistance rate cross-section diagram.
Fig. 5 is that change in resistance rate cross-section diagram is attached to the schematic diagram on model photo.
Specific embodiment
Referring to specific embodiment, the present invention will be described in detail.
Embodiment 1
In order to illustrate the preparation method of the method for the present invention, certain model test analog material preparation flow is given.
Coal mine arranges a suction road mash gas extraction to mitigate gas hazard usually above coal seam.In order to reach most
Excellent extracting result, suction road need to be arranged in the fissure zone that overlying rock generates after seam mining.Certain mine is in order to determine high pumping
The position in lane, proposed adoption time shift high-density electric detect fissure zone range.Before actual measurement, model is carried out first
Test, analog material preparation flow are as follows:
Step 1) establishes geologic geophysical model: prototype being divided into 53 pieces, every piece is stratiform, is tried according to rock mechanics
Result and resistivity logging data are tested, each piece of thickness, tensile strength, compression strength, density and resistivity are determined, such as table 1
In be 40-50 layers of parameter.
1 geologic geophysical model of table (40-50 layers)
Step 2) determines affinity constant: prototype working face moves towards long 998m, tilts long 195m, coal seam buried depth 350m.
Analog simulation platform size 3200mm × 1600mm × 250mm.Comprehensively consider analog platform size and prototype geometric parameter, geometry
Affinity constant is set as 1/300.Prototype rock averag density is about 2.5t/m3, model averag density is about 1.8t/m3, bulk density phase
Like constant be prototype rock averag density and the ratio of model averag density is 1.4.Intensity and elastic affinity constant are bulk density phases
It is 420 like the ratio of constant and geometric similarity constant.
Step 3) calculates the dosage of sand, calcium carbonate, gypsum and water: according to geometric similarity constant, by each thickness of prototype
Degree is converted to the every a layer thickness of model.According to bulk density affinity constant, intensity affinity constant, elastic affinity constant and prototype mechanics ginseng
Number determines the usage ratio of the sand of each layer of model, calcium carbonate, gypsum and water.Using existing method, usage ratio proportion
Number abc indicates that b:c is the ratio of calcium carbonate quality and gypsum quality, and a:1 is sand quality and (calcium carbonate quality+gypsum matter
Amount) ratio.It is with colon by consulting proportion table, i.e., similar to bulk density affinity constant, intensity affinity constant, elasticity often with colon
Empirical relation table between several and prototype mechanics parameter determines.Finally, according to each layer of model of size and sand, calcium carbonate,
The usage ratio of gypsum and water determines each layer of model of sand quality, calcium carbonate quality, the quality of gypsum quality and water.Its
In, sand, calcium carbonate and gypsum gross mass estimate a value and multiplied by 1.2 according to model averag density and each layer of volume
Coefficient, guarantee prepare material it is more more than needed than having for actual use, according to sand, calcium carbonate and gypsum gross mass and match colon,
Sand quality, calcium carbonate quality and gypsum quality can be found out respectively.The quality of water is sand, calcium carbonate and gypsum gross mass
10%.Cast material and dosage parameter in table 2 for 40-50 layers.
2 cast material of table and dosage (40-50 layers)
Step 4) calculates sodium chloride dosage: each layer of sand mass percentage S, gypsum quality percentage composition G are calculated,
Estimation model drying time t=524h and each layer of electricalresistivityρ bring formula C=exp (0.91 × (- 9.37+0.22S- into
1.2G+1.73ln (0.25t)-ln (ρ))), obtain each layer of concentration of sodium chloride solution C.By each layer of concentration of sodium chloride solution
C obtains the quality of each layer of sodium chloride multiplied by the quality of each layer of water, is shown in Table 2.
Step 5) ingredient: sand quality, calcium carbonate quality, stone needed for weighing each layer of step 3) calculating with electronic balance
Cream quality.Sodium chloride quality needed for weighing each layer of step 4) calculating with electronic balance.Step 3) calculating is weighed with measuring cup
Each layer needs the quality of water.
Step 6) stirring: obtaining sodium chloride solution for sodium chloride into the water, start blender, according to gypsum, calcium carbonate,
Material is poured slowly into 3~5min of stirring in blender by the sequence of sand and sodium chloride solution, is stirred evenly.
Step 7) is die-filling: the material stirred evenly being packed into mold, spreads one layer of thin cloud on the interface between every layer of model
Female powder.
Step 8) demoulding: demoulding after for 24 hours~48h model substantially dry.
Continue drying 22 days under step 9) room temperature, obtains required similar material model, as shown in Figure 1.
Embodiment 2
In order to illustrate the effect of the method for the present invention, the model test effect that embodiment 1 makes model is given.
Fig. 2 is Fig. 1 model inversion resistivity section figure before seam mining, and resistivity is in stratiform between 5~100 Ω m
Distribution.It is influenced by bulk effect and equivalent problem, inverting resistivity is the concentrated expression of each layer resistivity of model, on the whole model
Inverting resistivity is consistent with design resistivity value.
Fig. 3,4,5 are respectively resistivity section figure, change in resistance rate cross-section diagram and change in resistance when adopting to x=1.9m
Rate cross-section diagram is attached to the schematic diagram on model photo.By Fig. 3,4 as it can be seen that after seam mining, superstratum is deformed destruction, becomes
Shape destroyed area resistivity increases, and maximum increases to 5 times of original place layer resistivity, resistivity anomaly form and Overburden deformation and failure model
It encloses unanimously, geophysics transient model testing works well.
Claims (6)
1. being suitable for the preparation method of the analog material of geophysics transient model testing, analog material uses sand, gypsum, carbon
Sour calcium, water, sodium chloride and mica powder, wherein the dosage of sand, gypsum, calcium carbonate and water is determined by prototype mechanics parameter, chlorination
The dosage of sodium is codetermined by the dosage of prototype electrical parameter, sand, gypsum, calcium carbonate and water, and preparation method includes following step
It is rapid:
Step 1) establishes geologic geophysical model: by prototype piecemeal, determining piecemeal quantity, each piece of size positions, tension
Intensity, compression strength, density and resistivity；The piecemeal quantity and each piece of size positions according to experiment it needs to be determined that, institute
It is determining according to prototype rock mechanics experiment result to state each piece of tensile strength and compression strength, described each piece of resistivity root
It is determined according to prototype resistivity logging data；
Step 2) determines affinity constant using existing method: according to prototype size, mechanics parameter and die size, determining geometry phase
Like constant, bulk density affinity constant, intensity affinity constant and elastic affinity constant；
Step 3) calculates the dosage of sand, calcium carbonate, gypsum and water: according to geometric similarity constant, by each piece of size of prototype
Be converted to each piece of model of size；Each piece of model is determined according to mechanics affinity constant and mechanics parameter using existing method
Sand, calcium carbonate, gypsum and water usage ratio；According to each piece of model of size and sand, calcium carbonate, gypsum and water
Usage ratio determines each piece of model of sand quality, calcium carbonate quality, the quality of gypsum quality and water；
Step 4) calculates sodium chloride dosage: calculating each piece of sand mass percentage S, gypsum quality percentage composition G, estimation
Model drying time t；By the electricalresistivityρ of each block models, sand mass percentage S, gypsum quality percentage composition G and drying
Time t brings formula C=exp (0.91 × (- 9.37+0.22S-1.2G+1.73ln (0.25t)-ln (ρ))) into, obtains each piece
Concentration of sodium chloride solution C；Each piece of concentration of sodium chloride solution C is obtained into each block models multiplied by the quality of each block models water
Sodium chloride quality；The sand mass percentage is sand quality divided by the sum of sand, calcium carbonate and gypsum quality；Institute
Stating gypsum quality percentage composition is gypsum quality divided by the sum of sand, calcium carbonate and gypsum quality；
Step 5) ingredient: sand quality, calcium carbonate quality, stone needed for weighing each block models of step 3) calculating with electronic balance
Cream quality；Sodium chloride quality needed for weighing each block models of step 4) calculating with electronic balance；Step 3) meter is weighed with measuring cup
The quality of water needed for each block models calculated；
Step 6) stirring: sodium chloride is obtained into sodium chloride solution into the water, starts blender, according to gypsum, calcium carbonate, sand
Material is poured slowly into 3~5min of stirring in blender with the sequence of sodium chloride solution, is stirred evenly；
Step 7) is die-filling: the material stirred evenly being packed into mold, spreads one layer of thin mica powder on the interface between every piece of model；
Step 8) demoulding: demoulding after for 24 hours~48h model substantially dry；
Continue drying 15~30 days under step 9) room temperature, required similar material model can be obtained.
2. the preparation method suitable for the analog material of geophysics transient model testing according to claim 1, feature
It is, the prototype piecemeal in step 1), according to each piece of experiment needs to be stratiform or any irregular shape.
3. the preparation method suitable for the analog material of geophysics transient model testing according to claim 1, feature
It is, mechanics parameter described in step 2) starves tensile strength, compression strength and density.
4. the preparation method suitable for the analog material of geophysics transient model testing according to claim 1, feature
It is, mold described in step 2), is needed to be two-dimensional mold or three-dimensional mould according to experiment.
5. the preparation method suitable for the analog material of geophysics transient model testing according to claim 1, feature
It is, mechanics affinity constant described in step 3) includes bulk density affinity constant, intensity affinity constant and elastic affinity constant.
6. the preparation method suitable for the analog material of geophysics transient model testing according to claim 1, feature
It is, model drying time described in step 4) is model drying time in step 8).
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Application publication date: 20190607 |