CN111099856A - Similar simulation experiment material for dam body of underground reservoir and determination method for proportion of similar simulation experiment material - Google Patents
Similar simulation experiment material for dam body of underground reservoir and determination method for proportion of similar simulation experiment material Download PDFInfo
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- CN111099856A CN111099856A CN201911301585.XA CN201911301585A CN111099856A CN 111099856 A CN111099856 A CN 111099856A CN 201911301585 A CN201911301585 A CN 201911301585A CN 111099856 A CN111099856 A CN 111099856A
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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
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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
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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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
- G01N1/36—Embedding or analogous mounting of 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
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00991—Uses not provided for elsewhere in C04B2111/00 for testing
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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
- G01N1/36—Embedding or analogous mounting of samples
- G01N2001/366—Moulds; Demoulding
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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Abstract
The invention discloses a dam body similarity simulation experiment material for an underground reservoir, which is prepared from aggregate, a cementing agent and a protective agent, wherein the aggregate is river sand, the cementing agent is quick-drying cement, the protective agent is liquid paraffin, and the weight ratio of the river sand to the quick-drying cement to the liquid paraffin in the dam body similarity simulation experiment material for the underground reservoir is as follows: 3:1:18. The invention also discloses a method for determining the material proportion of the similar simulation experiment of the dam body of the underground reservoir. The mechanical parameters and seepage parameters of the similar material are similar to those of a reservoir dam body, the properties meet the requirements of fluid-solid coupling similar simulation experiments, and the problems of disintegration in water and visibility of water seepage in simulation of the solid model material are solved.
Description
Technical Field
The invention belongs to the technical field of similar materials, and particularly relates to a dam body similar simulation experiment material for an underground reservoir.
Background
As an effective means for protecting and recycling water resources in the coal mining process, the coal mine underground reservoir is well applied and implemented in practical engineering. As an underground large-scale water storage facility, the stability of the dam body of the underground reservoir of the coal mine is a problem which cannot be ignored. Mining operation in a mining area is frequent, incoming pressure disturbance load caused in the mining process poses great threat to dam bodies of the underground reservoir, once a dam break accident occurs, resources are wasted, and safety of underground facilities and personnel is greatly threatened, so that research on the whole water-resisting stability problem of the underground reservoir in the goaf is very necessary.
People study and analyze the problems of the whole water insulation stability and the like of the underground reservoir in the goaf through a similar simulation experiment in a laboratory, but the dam body structure is simulated by the existing similar material, the obtained dam body motion and crack evolution rule is inconsistent with the reality, the diving seepage rule and related parameters have larger deviation with the prototype, and the underground reservoir dam body structure cannot be well simulated.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a similar simulation experiment material for an underground reservoir dam body, wherein the mechanical parameters and seepage parameters of the material are similar to those of the reservoir dam body, the properties of the material meet the requirements of fluid-solid coupling similar simulation experiments, and the problems of disintegration in water and visibility in simulation of seepage of a middle water body of a solid model material are solved.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides an underground reservoir dam body simulation modeling experiment material which characterized in that: the simulation experiment material for the dam body of the underground reservoir is prepared from aggregate, a cementing agent and a protective agent, wherein the aggregate is river sand, the cementing agent is quick-drying cement, the protective agent is liquid paraffin, and the weight ratio of the river sand to the quick-drying cement to the liquid paraffin in the simulation experiment material for the dam body of the underground reservoir is 3:1: 18.
The similar simulation experiment material for the dam body of the underground reservoir is characterized in that: the river sand is dry river sand.
The invention also discloses a method for determining the material proportion of the similar simulation experiment of the dam body of the underground reservoir as claimed in claim 1, which is characterized by comprising the following steps:
firstly, a material preliminary test, namely weighing aggregate, a cementing agent and a protective agent respectively, wherein the mass ratio of the aggregate to the cementing agent to the protective agent is 1:1:1, mixing the aggregate to the cementing agent to the protective agent in a mass ratio of 1:1:1 to prepare a test piece, then placing the prepared test piece in water to soak for 48 hours, judging the non-hydrophilicity of the test piece by observing whether the test piece is subjected to ineffective disintegration after being soaked in the water for 48 hours, and if the test piece is not subjected to ineffective disintegration after being soaked in the water for 48 hours, the test piece has good non-hydrophilicity and can be subjected to the next step of proportioning test;
step two, determining the bone cement ratio: weighing aggregates and a cementing agent with different weight ratios, preparing the aggregates and the cementing agent with each ratio into a plurality of test pieces, testing the strength of all the test pieces with all the ratios, drawing the test data of each test piece with each ratio into a test piece stress-strain curve graph, comparing the test piece stress-strain curve graph with the average stress-strain curve graph of the original rock of the dam body to be simulated, and determining the ratio of the aggregates and the cementing agent corresponding to the most matched stress-strain curve;
determining the proportion of bone cement and a protective agent, respectively weighing aggregate, a cementing agent and the protective agent, forming a mixed material with different mass proportions by the aggregate, the cementing agent and the protective agent, preparing the mixed material into test pieces, carrying out proportion marking on each test piece, carrying out permeability coefficient test on the marked test pieces to obtain permeability coefficient data of the test pieces, comparing the obtained permeability coefficient data of the test pieces with the permeability coefficient data of the original rock of the dam body to be simulated, and selecting the proportion of the test pieces corresponding to the permeability coefficient data of the test pieces similar to the permeability coefficient data of the original rock of the dam body to be simulated, wherein the proportion is the proportion of the final similar material of the dam body to be simulated.
The method for determining the material ratio of the similar simulation experiment of the dam body of the underground reservoir is characterized by comprising the following steps of: in the first step, the aggregate, the cementing agent and the protective agent in a mass ratio of 1:1:1 are mixed to prepare a test piece, and the method comprises the following steps:
step 101, weighing aggregate, cementing agent and protective agent, namely weighing river sand, quick-drying cement and liquid paraffin with the same mass;
step 102: pouring the river sand, the quick-drying cement and the liquid paraffin weighed in the step 101 into a stirring pot, mechanically stirring uniformly, and continuously stirring;
step 103: pouring the uniformly stirred mixture of river sand, quick-drying cement and liquid paraffin into a test mold, and quickly compacting and tamping by using a tamping tool;
step 104: and (5) after the experimental material is cooled and formed, removing the test mold and taking out the formed test piece, and finishing the test piece manufacture.
The method for determining the material ratio of the similar simulation experiment of the dam body of the underground reservoir is characterized by comprising the following steps of: the concrete method for weighing the aggregates and the cementing agent with different weight proportions in the step two is as follows: the aggregate and the cementing agent in the mass ratio of 1:1, 2:1, 3:1, 4:1 and 5:1 are weighed respectively, and the concrete method for preparing the aggregate and the cementing agent in each ratio into a plurality of test pieces is to prepare 20 test pieces for the aggregate and the cementing agent in each ratio respectively.
Compared with the prior art, the invention has the following advantages:
1. the main materials of the invention are river sand, quick-drying cement and liquid paraffin, which have wide sources, low cost and no harm to human body.
2. The invention adopts river sand as aggregate, quick-drying cement as cementing agent and liquid paraffin as protective agent, so that the model is easy to form, the solidification time is short, and the model is convenient to build quickly.
3. The river sand is used as aggregate, cement is used as cementing agent to enhance the brittleness and the cohesiveness of the material, liquid paraffin is used as a flow-solid phase simulation experiment material of a non-hydrophilic protective agent, the mechanical parameters and the seepage parameters of the material are similar to those of a reservoir dam body, the properties meet the requirements of a flow-solid coupling simulation experiment, and the problems of disintegration in water and the visibility of the seepage of a water body in simulation of a solid model material are solved.
The invention is described in further detail below with reference to the figures and examples.
Drawings
FIG. 1 is a graph of the average stress-strain curve of the original rock test piece of the present invention.
FIG. 2 is a stress-strain curve of different bone cement ratios according to the present invention.
FIG. 3 is a graph showing the permeation rate of various bone glue to protectant ratios according to the present invention.
FIG. 4 is a model diagram of a dam body according to an embodiment of the present invention.
FIG. 5 is a force calculation graph of the dam body model of the present invention.
Fig. 6 is a diagram of a simulation process of true triaxial compression set compression in an embodiment of the present invention.
FIG. 7 is a graph comparing the relationship between the axial additional stress and the axial total strain at different confining pressures.
FIG. 8 is a flow chart of a similar material proportioning experiment of the present invention.
Description of reference numerals:
1-stress-strain curve with bone cement ratio of 5: 1; 2-stress strain curve with bone cement ratio of 4: 1;
3-stress strain curve with bone cement ratio of 3: 1; 4-stress-strain curve with bone cement ratio of 2: 1;
5-stress-strain curve with bone cement ratio of 1: 1;
6-permeation rate curve when the ratio of bone glue to protective agent is 1: 19.5;
7-permeation rate curve when the ratio of bone glue to protective agent is 1: 19;
8-permeation rate curve when the ratio of bone glue to protective agent is 1: 18.5;
9-permeation rate curve at a 1:18 ratio of bone glue to protectant;
10-permeation rate curve at a 1:17.5 ratio of bone glue to protectant;
11-permeation rate curve when the ratio of bone glue to protective agent is 1: 17;
12-permeation rate curve when the ratio of bone glue to protective agent is 1: 16.5;
13-permeation rate curve when the ratio of bone glue to protective agent is 1: 16;
14-a curve graph of the relation between the axial additional stress and the axial total strain when the additional stress is 5 KPa;
15-a relation curve graph of axial additional stress and axial total strain when the additional stress is 20 KPa;
16-a curve graph of the relation between the axial additional stress and the axial total strain when the additional stress is 35 KPa;
Detailed Description
The invention is explained by the research of simulation experiment materials of the dam body of the underground reservoir in the Shendong mining area:
at present, the artificial dam body in the Shendong mining area is mainly made of concrete, I-steel, anchor rods and reinforcing mesh sheets, the dam wall is formed into a whole by pouring C30 concrete, the top sealing and the plugging are carried out by adopting a concrete spraying mode after the pouring is finished, and when the safety coefficient is 3.0, the maximum bearing water level is 60 m.
In a physical simulation experiment, selecting a proper model material is one of key links of simulation, and according to the simulation experiment theory of similar materials, namely the fluid-solid coupling similar criterion and the property of the similar materials, the similar model material has the characteristics of non-hydrophilicity, low permeability and plastic deformation. Therefore, a non-hydrophilic simulation material is firstly developed in the fluid-solid two-phase simulation experiment, the non-hydrophilic simulation material has similar mechanical properties with a prototype, and for a long time, the simulation experiment of the non-metal mine stope is mainly developed aiming at a working surface and surrounding rocks covered with a certain thickness, and the selected material is a brittle single-phase material. The simulation experiment of the artificial dam body needs to consider the requirements of properties of the dam body, such as non-disintegration when meeting water, similar strength, similar water resistance and the like, so that reasonable similar materials and proportions of the dam body need to be explored.
Regarding the selection of components of bedrock similar materials, the prior methods mainly comprise two types: one is to select clean river sand as aggregate and gypsum and white powder as cementing material in a solid phase model. The strength of the material can meet the single-phase simulation requirement of a basement layer, but the material is easy to disintegrate when meeting water, and the test material must meet the requirement that the strength is not volatile after meeting water in consideration of the test requirement of the seepage coupling effect of a dam body and a water body, so that the method is not suitable for simulating an artificial dam body. The other method is a method for preparing the matrix material by adopting dry river sand and solid paraffin in a two-phase model, the material properties after the dry river sand and the solid paraffin are fully mixed in a molten state according to different proportions can meet the requirements of strength, plasticity and non-hydrophilicity of different matrix layers, and a large number of tests prove the superiority of brittleness-plasticity-water-property of the material. However, the experimental personnel are difficult to control and grasp the melting temperature of the solid paraffin accurately in the process of preparing similar materials, and meanwhile, because the main component of the solid paraffin is a mixture of solid high-grade alkanes, the melting point is 42-54 ℃, and if the temperature control on a heating dish is not accurate enough in the processes of heating and frying, the paraffin is easy to release a large amount of 'green smoke' at high temperature, and the 'green smoke' is analyzed by referring to related data and mainly comprises the following components: vapor of some liquid alkanes such as nonane, heptane, octane, hexane, pentane and the like has certain stimulation influence on respiratory tracts if being inhaled by a small amount of experimenters in the process of preparing similar materials, and when a laboratory is not ventilated, high-concentration paraffin vapor can cause certain anesthetic effect on the experimenters, and various physical discomfort can occur if the vapor is contacted for a long time. In view of the existing dissonance of the constant temperature baking and frying device and the harmful gas removing and ventilating facility in the similar simulation laboratory, a new preparation method of fluid-solid coupling bedrock layer similar materials needs to be selected urgently. As the non-hydrophilicity of the paraffin has been verified by a large number of tests, and in order to reduce the potential damage of volatile toxic vapor to the bodies of testers, the liquid paraffin is selected as an improved material for preparing a matrix rock similar material, is colorless semitransparent oily liquid, is odorless, tasteless, insoluble in water and ethanol, soluble in volatile oil, miscible in most nonvolatile oils, stable to light, heat, acid and the like, and can be used as a film curing agent of the similar material to promote the hydration between cement and sand.
In view of the above material analysis results, the invention uses the screened dry river sand as aggregate, and simultaneously selects quick-drying cement as cementing agent to enhance the brittleness and cohesiveness of the bedrock and liquid paraffin as non-hydrophilic protective agent in order to increase the strength of the bedrock material. The materials are low in price, convenient to obtain and convenient for quick construction of the model.
After the material is determined, the proportion of the material can be determined, and the specific steps are as follows:
preliminary experiments on materials
The method comprises the steps of weighing aggregate, a cementing agent and a protective agent respectively, wherein the mass ratio of the aggregate to the cementing agent to the protective agent is 1:1:1, mixing the aggregate to the cementing agent to the protective agent in a mass ratio of 1:1:1 to prepare a test piece, soaking the test piece in water for 48 hours, judging the non-hydrophilicity of the test piece by observing whether the test piece undergoes ineffective disintegration after being soaked in the water for 48 hours, and if the test piece does not undergo ineffective disintegration after being soaked in the water for 48 hours, the test piece has good non-hydrophilicity and can be subjected to the next step of proportioning test.
The specific method comprises the following steps: weighing aggregate, cementing agent and protective agent required in the experiment by adopting a physical balance, wherein the mass ratio of the cementing agent to the protective agent is 1:1:1, and pouring the weighed and mixed aggregate, cementing agent and protective agent into a stirring pot for mechanical dry-mixing uniformly and continuously stirring. The stirring is continuously carried out, so that the cementing material and the aggregate are uniformly mixed on one hand, and the material is not suitable for rapid condensation on the other hand. Before the test piece is manufactured, lubricating oil is coated on the inner surface of the mold so as to facilitate mold removal, and thus the quality of the test piece is guaranteed. Because the mould easily coheres after the experimental materials heating, in order to guarantee the surface quality of test piece, select for use the used two division of mould preparation cylinder samples of triaxial test. Pouring the mixed material into a test mould, quickly compacting and tamping by a tamping tool, and disassembling after the experimental material is cooled and formed. And the test pieces are maintained after the model material is low in strength and the model is removed, three test pieces are manufactured in each group, and the test pieces are numbered and collected for testing. And (3) soaking the test piece in water for 48 hours, judging the non-hydrophilicity of the test piece by observing whether the test piece undergoes ineffective disintegration after being soaked in water for 48 hours, and if the test piece does not undergo ineffective disintegration after being soaked in water for 48 hours, the test piece has good non-hydrophilicity and can be subjected to the next proportioning test. And determining the bone-cement ratio after the preliminary verification is completed.
(II) determining the bone-to-glue ratio:
weighing aggregate and cementing agent with different weight ratios, preparing the aggregate and the cementing agent with each ratio into a plurality of test pieces, testing the strength of the test pieces with all ratios, drawing the test data of the test pieces with all ratios into a test piece stress-strain curve graph, comparing the test piece stress-strain curve graph with the average stress-strain curve graph of the original rock of the dam body to be simulated, and determining the ratio of the aggregate and the cementing agent corresponding to the most matched stress-strain curve.
The specific method comprises the following steps: as the proportion between the cement and the water is researched a lot before and can be used as a reference, the reasonable proportion between the river sand, the cement and the liquid paraffin is mainly determined, two conditions are mainly required to be met, and firstly, the material strength is required to be similar to the stress-strain curve rule of a bedrock prototype; secondly, the water physical property of the material needs to be similar to that of the original foundation rock stratum, and the main index permeability coefficient is selected as a standard for judging whether the mixture ratio reaches the standard.
In order to improve the design efficiency of the mixture ratio, a reasonable ratio is determined by adopting a hierarchical progressive method, and the experimental flow of the mixture ratio of similar materials is shown in figure 8.
According to the layered progressive flow, a large number of test pieces are manufactured according to different proportions. Firstly, determining a bone cement ratio a, and preparing 20 test pieces respectively according to four proportions (weight ratios) of 1:1, 2:1, 3:1, 4:1 and 5:1 of bone cement according to past experience for strength test.
In this embodiment, geological conditions of the Shendong area are mainly used as a basis, according to the artificial dam sampling strength test, the mechanical properties of the artificial dam in the Shendong area are shown in table 1, the average stress-strain test result of the original rock test piece is shown in fig. 1, and the stress-strain whole-course curve of different bone-cement ratios is shown in fig. 2.
TABLE 1 Artificial dam body mechanics characteristic table
According to the test result, after the stress-strain of the original rock is subjected to similar conversion, the stress-strain curve most consistent with the stress-strain curve is the bone-cement ratio of 3:1, and therefore the matrix bone-cement ratio a in the first step of the flow chart is determined to be 3: 1.
(III) determining the proportion of the bone glue to the protective agent:
weighing aggregate, cementing agent and protective agent respectively, forming mixed materials with different mass ratios by using the aggregate, the cementing agent and the protective agent, wherein the mass ratio of the aggregate to the cementing agent in the mixed materials is the ratio of the aggregate to the cementing agent corresponding to the stress-strain curve in the step two, preparing the mixed materials into test pieces, carrying out ratio marking on each test piece, carrying out permeability coefficient test on the marked test pieces to obtain permeability coefficient data of the test pieces, comparing the obtained permeability coefficient data of the test pieces with the original rock permeability coefficient data of the dam body to be simulated, and selecting the ratio of the test pieces corresponding to the permeability coefficient data of the test pieces similar to the original rock permeability coefficient data of the dam body to be simulated, wherein the ratio is the ratio of the final similar materials of the dam body to be simulated.
The specific method comprises the following steps: in the experiment, the permeation coefficients of different protective agent ratios are mainly tested when the bone-to-gel ratio is 3:1, and according to Darcy's law, the permeation coefficients are measured in unit waterThe velocity of the water flow per unit cross-sectional area of the material perpendicular to the direction of the water flow under the pressure gradient. Because the geometric similarity constants in the similar simulation experiment are all larger, generally about 100, and the strength of the experimental material is relatively small, the permeability coefficient of the material is tested by adopting a water conductivity meter testing method in the experiment, and the calculation formula of the permeability coefficient is as follows.
In the formula, K is a permeability coefficient and the unit of K is mm/h; l is the thickness of the experimental material, and the unit is mm; h is the thickness of the water layer, and the unit is mm; tn is the interval time in units of h. Wherein Q is:
wherein Q is the average water amount of n bleeds in mm3；Q1、Q2、Q3…QnThe unit of the water seepage is mm3(ii) a S is the cross-sectional area in mm2。
Completely putting the experimental material into water, soaking for 48 hours, then starting the test, collecting by using a water collecting cylinder process during the experiment, starting timing after the experiment lasts for 1 hour and is stable, reading every 1 hour, and recording the exuded water quantity Q1…Qn. The proportion of the gelling agent in different proportions of the experimental materials is from large to small, wherein the permeability coefficient of the materials with the 8-component proportion is shown in Table 2. The basic rule is that the smaller the proportion of the protective agent in the material, the larger the permeability coefficient, and further indicates that the more hydrophilic the material, the stronger the permeability.
TABLE 2 permeability coefficient/mm.h of experimental materials-1
The permeability coefficient test result of the artificial dam body sampled on site is 10.24-26.25 mm/h, and the geometric similarity constant C of the experiment l100, volume weight similarity constant Cγ1.56, the permeability coefficient similarity constant C can be obtained by the fluid-solid coupling similarity criterionK6.4, prepared fromThe permeability coefficient of the experimental material can be calculated to be 1.62-4.10 mm/h. From table 2, it can be known that the actually measured permeability coefficient of the material with the protective agent ratio in the range of 1: 16-1: 20 meets the experimental requirements, the permeability coefficient of the material is within the calculated value of the similar theory, and the permeability of the material is similar to that of the artificial dam body.
By approximating the measured data range of a large number of test pieces to the permeation rate curve chart of different bone glue and protective agent ratios shown in fig. 3, the permeation rate difference measured for the test pieces of different bone glue and protective agent ratios is large, wherein the permeation rates of 1:17.5 and 1:18 are close to the conversion value of the permeation rate of the artificial dam body, but the fluctuation of the permeation rate of 1:17.5 is slightly larger than that of 1:18, so that the proportion of 1:18 is selected reasonably.
Through the proportioning design and property determination of the matrix simulation material, the matrix bone cement ratio a is 3:1, the bone cement and protective agent ratio b is 1:18, namely the ratio of the dried river sand, the quick-drying cement and the liquid paraffin is 3:1: 18.
In order to verify the accuracy of the obtained proportioning parameters, true triaxial solid-liquid coupling compression simulation calculation is carried out on the sample, the material proportioning is assigned according to the proportion of 3:1:18, and the sample adopts a plastic constitutive model based on Drucker-Prager (Deluke-Prager) yield criterion, as shown in figures 4 and 5. And matching with Mohr-Coulomb criterion, applying confining pressure by water pressure, and axially controlling loading by displacement, as shown in FIG. 6. A comparison graph of the relationship between the axial additional stress and the axial total strain under different confining pressures is shown in FIG. 7, and can be obtained through comparison and analysis, the proportion of the obtained artificial dam similar material meets the deformation failure rule of the in-situ dam, and the test requirements under the fluid-solid coupling condition can be met.
According to the requirements of the flow-solid two-phase simulation test of the artificial dam body of the underground reservoir, the invention develops similar materials, including selection and proportioning tests of aggregate, cementing agent and protective agent materials, manufacturing of a model material test piece, and mechanical parameter test and water quality analysis of the model material test piece. According to the test result, similar materials and proportions suitable for manufacturing the fluid-solid model are screened out, the elastic mechanical similar conditions of the rock mass medium and the fluid mechanical similar conditions of water are deduced according to the fluid-solid coupling mathematical model of the continuous medium, and the theoretical basis of the fluid-solid coupling similar simulation is determined according to the fluid-solid coupling similar criteria given by the elastic mechanical similarity and the fluid mechanical similarity. Through multiple approximation of a mechanical property experiment and a similar material proportioning experiment, an experimental material which is correspondingly proportioned with a prototype is developed, and the material has the characteristics of good non-hydrophilicity and stable mechanical deformation performance. The related coupling parameter test shows that the elastic mechanical parameters and seepage mechanical parameters of the experimental material are similar to those of a prototype, and the requirements of the fluid-solid coupling similar simulation experiment are met. Three-axis compression simulation calculation based on Drucker-Prager criteria shows that the proportion of the obtained artificial dam similar material meets the deformation damage rule of the in-situ dam, and the test requirement under the fluid-solid coupling condition can be met.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (5)
1. The utility model provides an underground reservoir dam body simulation modeling experiment material which characterized in that: the simulation experiment material for the dam body of the underground reservoir is prepared from aggregate, a cementing agent and a protective agent, wherein the aggregate is river sand, the cementing agent is quick-drying cement, the protective agent is liquid paraffin, and the weight ratio of the river sand to the quick-drying cement to the liquid paraffin in the simulation experiment material for the dam body of the underground reservoir is 3:1: 18.
2. The simulation modeling experiment material for an underground reservoir dam according to claim 1, characterized in that: the river sand is dry river sand.
3. The method for determining the material ratio of the simulation modeling experiment of the dam body of the underground reservoir as claimed in claim 1, wherein the method comprises the following steps:
firstly, a material preliminary test, namely weighing aggregate, a cementing agent and a protective agent respectively, wherein the mass ratio of the aggregate to the cementing agent to the protective agent is 1:1:1, mixing the aggregate to the cementing agent to the protective agent in a mass ratio of 1:1:1 to prepare a test piece, then placing the prepared test piece in water to soak for 48 hours, judging the non-hydrophilicity of the test piece by observing whether the test piece is subjected to ineffective disintegration after being soaked in the water for 48 hours, and if the test piece is not subjected to ineffective disintegration after being soaked in the water for 48 hours, the test piece has good non-hydrophilicity and can be subjected to the next step of proportioning test;
step two, determining the bone cement ratio: weighing aggregates and a cementing agent with different weight ratios, preparing the aggregates and the cementing agent with each ratio into a plurality of test pieces, testing the strength of all the test pieces with all the ratios, drawing the test data of each test piece with each ratio into a test piece stress-strain curve graph, comparing the test piece stress-strain curve graph with the average stress-strain curve graph of the original rock of the dam body to be simulated, and determining the ratio of the aggregates and the cementing agent corresponding to the most matched stress-strain curve;
determining the proportion of bone cement and a protective agent, respectively weighing aggregate, a cementing agent and the protective agent, forming a mixed material with different mass proportions by the aggregate, the cementing agent and the protective agent, preparing the mixed material into test pieces, carrying out proportion marking on each test piece, carrying out permeability coefficient test on the marked test pieces to obtain permeability coefficient data of the test pieces, comparing the obtained permeability coefficient data of the test pieces with the permeability coefficient data of the original rock of the dam body to be simulated, and selecting the proportion of the test pieces corresponding to the permeability coefficient data of the test pieces similar to the permeability coefficient data of the original rock of the dam body to be simulated, wherein the proportion is the proportion of the final similar material of the dam body to be simulated.
4. The method for determining the material ratio of the simulation experiment of the dam body of the underground reservoir according to the claim 3, is characterized in that: in the first step, the aggregate, the cementing agent and the protective agent in a mass ratio of 1:1:1 are mixed to prepare a test piece, and the method comprises the following steps:
step 101, weighing aggregate, cementing agent and protective agent, namely weighing river sand, quick-drying cement and liquid paraffin with the same mass;
step 102: pouring the river sand, the quick-drying cement and the liquid paraffin weighed in the step 101 into a stirring pot, mechanically stirring uniformly, and continuously stirring;
step 103: pouring the uniformly stirred mixture of river sand, quick-drying cement and liquid paraffin into a test mold, and quickly compacting and tamping by using a tamping tool;
step 104: and (5) after the experimental material is cooled and formed, removing the test mold and taking out the formed test piece, and finishing the manufacture of the test piece.
5. The method for determining the material ratio of the similar simulation experiment of the dam body of the underground reservoir according to the claim 3 or 4, is characterized in that: the concrete method for weighing the aggregates and the cementing agent with different weight proportions in the step two is as follows: the method comprises the following steps of weighing aggregate and cementing agent in four proportions of 1:1, 2:1, 3:1, 4:1 and 5:1 respectively, and preparing the aggregate and the cementing agent in each proportion into a plurality of test pieces.
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