CN108020464B - Method for calibrating uniformity degree of similar materials by using strain bricks - Google Patents
Method for calibrating uniformity degree of similar materials by using strain bricks Download PDFInfo
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- CN108020464B CN108020464B CN201711096342.8A CN201711096342A CN108020464B CN 108020464 B CN108020464 B CN 108020464B CN 201711096342 A CN201711096342 A CN 201711096342A CN 108020464 B CN108020464 B CN 108020464B
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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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/30—Measuring arrangements characterised by the use of mechanical techniques for measuring the deformation in a solid, e.g. mechanical strain gauge
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Abstract
A method for calibrating the uniformity degree of similar materials by using strain bricks comprises the steps that the used equipment comprises a plurality of groups of strain bricks, a plane stress test bed and a strain monitoring system, wherein each group of strain bricks consists of a plurality of strain bricks; the method for calibrating the uniformity degree of similar materials comprises the following steps: step 1, laying in layers; step 2, electrically connecting each strain brick with a strain monitoring system, and resetting initial data of each strain brick; step 3, tamping each layer of similar materials, monitoring the magnitude of micro-strain epsilon on each strain brick in each layer of similar materials in the layer of similar materials in real time through a strain monitoring system in the tamping process of each layer of similar materials needing to be laid with the strain bricks, and when the magnitudes of the micro-strain epsilon on each strain brick are equal, proving that the similar materials in the layer have the same uniformity degree; and 4, paving the similar materials according to the 3 steps in sequence until the similar materials are paved to the design height of the similar material model. The problem of similar material homogeneity degree low in the manual tamping process is solved.
Description
Technical Field
The invention relates to the field of similar material simulation experiments, in particular to a method for calibrating the uniformity of similar materials in the tamping process of a plane stress test bed paved with the similar materials.
Background
The similar material simulation experiment is a research method which can be used for truly simulating the overlying strata structure and motion law, the stope surrounding rock displacement and the stress field change in the coal seam mining process, compared with the field actual measurement, the similar material simulation experiment is more convenient, the experiment time consumption is short, the cost is low, the specific research can be carried out aiming at a certain mechanism, and meanwhile, the change process of the overlying strata structure and the surrounding rock stress in the coal seam mining process can be dynamically reflected. The simulation experiment of the similar material is a scientific and effective method which mainly replaces the physical and mechanical parameters of the coal rock mass on site with the similar material according to a similar theory, reduces the site prototype according to a certain proportion, ensures that the initial state of the simulation experiment of the similar material is similar to the boundary condition of the prototype, performs the simulation experiment on the basis, and finally restores the simulation experiment to the site.
At present, equipment for simulating similar materials in China mainly comprises a plane stress test bed, the similar materials are uniformly layered and laid in the plane stress test bed, each layer of similar materials needs to be tamped in the layered laying process of the similar materials, but in the manual tamping process, the tamping degrees of the similar materials in each layer cannot be guaranteed to be the same, the different tamping degrees can seriously influence the physical and mechanical properties of the same similar material, so that the density, porosity, mechanical property and other parameters of the similar materials in the same layer are lack of uniformity, and the reliability and the reality of a similar material simulation test are seriously influenced.
Therefore, it is a technical problem to be solved urgently at present to research a method for calibrating whether the uniformity degree of similar materials is consistent.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the technical problem to be solved by the present invention is to provide a method for calibrating the uniformity of similar materials.
In order to achieve the purpose, the invention provides a method for calibrating the uniformity degree of similar materials by using strain bricks, wherein the used equipment comprises a plurality of groups of strain bricks, a plane stress test bed and a strain monitoring system, and each group of strain bricks consists of a plurality of strain bricks;
the method for calibrating the uniformity degree of similar materials comprises the following steps:
step 1: laying in layers: the method comprises the following steps of (1) layering and uniformly paving similar materials in a plane stress test bed to form a similar material body with a plurality of layers, and paving a plurality of strain bricks in each layer of similar materials at equal intervals in the process of paving the similar materials and the process of paving the similar materials of each layer of the strain bricks;
step 2: connection monitoring and zero clearing: electrically connecting each strain brick in each layer of similar material for laying the strain bricks with a strain monitoring system, starting the strain monitoring system and resetting initial data of each strain brick in each layer of similar material for laying the strain bricks;
and step 3: monitoring and tamping in real time: after the similar materials of each layer and a plurality of strain bricks in each layer of similar materials needing to be laid are laid, the similar materials of each layer are tamped, the magnitude of micro-strain epsilon on each strain brick in the similar materials of the layer is monitored by a strain monitoring system in real time in the tamping process of each layer of similar materials needing to be laid, whether the uniformity degree of the similar materials of the layer at different positions is consistent or not is judged according to the magnitude of the micro-strain epsilon, and when the magnitude of the micro-strain epsilon on each strain brick is equal, the uniformity degree of the similar materials of the layer is proved to be consistent;
and 4, step 4: and (3) paving similar materials sequentially according to the 3 steps until the similar materials are paved to the design height of the similar material model.
The strain monitoring system is formed by electrically connecting a high-speed static/dynamic strain gauge with a computer, and in the step 2, each strain brick in each layer of similar materials for laying the strain bricks is electrically connected with the high-speed static/dynamic strain gauge.
The invention has the beneficial effects that:
(1) in the method, the micro-strain of the strain brick is obvious under the condition of compression, the sensitivity and the accuracy are higher, the data is easy to measure, and the strain can be monitored in real time in the process of tamping similar materials;
(2) whether the compaction uniformity degrees of different positions of the similar materials are consistent or not is judged by monitoring the magnitude of the micro-strain of the strain bricks at different positions in the similar materials in real time. When the micro-strain of the strain bricks at each position is equal, the tamping degrees of similar materials can be judged to be the same;
(3) the method has the advantages of low cost and high operability, can quickly judge the tamping uniformity of the laid similar material bodies in the tamping process, not only ensures the similar material bodies to have the same tamping degree, but also saves time.
In a word, the method ensures the uniformity of the tamping degree of the similar material body, improves the reliability of the simulation test of the similar material, and has the advantages of higher accuracy, simple operation and lower cost.
Drawings
FIG. 1 is a schematic view of the structure of each strain brick of the present invention;
FIG. 2 is a schematic view of the working conditions for calibrating the uniformity of similar materials.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
as shown in fig. 1 and 2, a method for calibrating the uniformity of similar materials by using strain bricks is characterized in that: the equipment comprises a plurality of groups of strain bricks, a plane stress test bed 4 and a strain monitoring system, wherein each group of strain bricks consists of a plurality of strain bricks 1;
the method for calibrating the uniformity degree of similar materials comprises the following steps:
step 1: laying in layers: the method comprises the following steps of (1) layering and uniformly paving similar materials in a plane stress test bed 4 to form a similar material body 2 with a plurality of layers, and paving a plurality of strain bricks 1 in each layer of similar materials at equal intervals in the process of paving the similar materials and the process of paving similar materials of each layer of the strain bricks;
step 2: connection monitoring and zero clearing: electrically connecting each strain brick 1 in each layer of similar material for laying the strain bricks with a strain monitoring system, starting the strain monitoring system and resetting initial data of each strain brick 1 in each layer of similar material for laying the strain bricks;
and step 3: monitoring and tamping in real time: after each layer of similar materials and a plurality of strain bricks 1 in each layer of similar materials needing to be laid are laid, the similar materials in each layer are tamped, the magnitude of micro-strain epsilon on each strain brick 1 in the layer of similar materials is monitored through a strain monitoring system in real time in the tamping process of each layer of similar materials needing to be laid, whether the uniformity degree of the layer of similar materials at different positions is consistent or not is judged according to the magnitude of the micro-strain epsilon, and when the magnitudes of the micro-strain epsilon on each strain brick 1 are equal, the uniformity degree of the layer of similar materials is proved to be consistent;
and 4, step 4: and (3) paving similar materials sequentially according to the 3 steps until the similar materials are paved to the design height of the similar material model.
In this embodiment, each strain brick 1 is a cube with a side length of 30mm, and the length × width of the planar stress test stand 4 is 2500mm × 180 mm. In other embodiments, the dimensions of the strain brick 1 and the plane stress test stand can be other according to the actual requirements to achieve substantially the same technical effect.
As shown in fig. 1 and 2, the strain monitoring system is composed of a high-speed static/dynamic strain gauge 3 and a computer 5 which are electrically connected, and in the step 2, each strain brick 1 in each layer of similar materials for laying the strain bricks is electrically connected with the high-speed static/dynamic strain gauge 3. Each strain brick 1 consists of a polyurethane block 7 and a strain foil 6, the strain foil 6 is adhered to one side surface around the polyurethane block 7, and the side surface and the exposed surface of the strain foil 6 are coated with silica gel. The data lead of the strain gage 6 of each strain brick 1 is electrically connected with the high-speed static/dynamic strain gauge 3 of the strain monitoring system.
The foregoing is merely a detailed description of preferred embodiments of the invention and is not intended to limit the scope of the invention; it should be understood that various changes and modifications of the technical solution of the present invention, which can be made by those skilled in the art without inventive efforts based on the inventive concept, should fall within the protective scope of the present invention as defined by the appended claims.
Claims (1)
1. A method for calibrating the uniformity degree of similar materials by using strain bricks is characterized by comprising the following steps: the equipment comprises a plurality of groups of strain bricks, a plane stress test bed (4) and a strain monitoring system, wherein each group of strain bricks consists of a plurality of strain bricks (1); the method for calibrating the uniformity degree of similar materials comprises the following steps:
step 1: laying in layers: the method comprises the following steps of (1) layering similar materials, uniformly paving the materials in a plane stress test bed (4) frame to form a similar material body (2) with a plurality of layers, and paving a plurality of strain bricks (1) in each layer in equal intervals in the similar materials in the process of paving the similar materials and the process of paving the similar materials in each layer of the similar materials needing to be paved;
step 2: connection monitoring and zero clearing: electrically connecting each strain brick (1) in each layer of similar material for laying the strain brick with a strain monitoring system, starting the strain monitoring system and resetting initial data of each strain brick (1) in each layer of similar material for laying the strain brick; the strain monitoring system is formed by electrically connecting a high-speed static/dynamic strain gauge (3) with a computer (5), and each strain brick (1) in each layer of similar material paved with the strain bricks is electrically connected with the high-speed static/dynamic strain gauge (3);
and step 3: monitoring and tamping in real time: after each layer of similar materials and a plurality of strain bricks (1) in each layer of similar materials needing to be laid are laid, the similar materials in each layer are tamped, the magnitude of micro-strain epsilon on each strain brick (1) in the layer of similar materials is monitored in real time through a strain monitoring system in the tamping process of each layer of similar materials needing to be laid, whether the uniformity degree of the similar materials in the layer is consistent at different positions is judged according to the magnitude of the micro-strain epsilon, and when the magnitudes of the micro-strain epsilon on each strain brick (1) are equal, the uniformity degree of the similar materials in the layer is proved to be consistent;
and 4, step 4: paving similar materials according to the 3 steps in sequence until the similar materials are paved to the design height of the similar material model; each strain brick comprises a polyurethane block and a strain gauge, the strain gauge is pasted on one side surface around the polyurethane block, the exposed surfaces of the side surface and the strain gauge are coated with silica gel, and a data lead of each strain brick strain gauge is electrically connected with a high-speed static/dynamic strain gauge of a strain monitoring system.
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| CN108020464B true CN108020464B (en) | 2020-04-21 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1584621A (en) * | 2004-05-28 | 2005-02-23 | 清华大学 | Horizontal magnetic coupler mechanical loading and measuring systems |
| CN102147301A (en) * | 2010-12-28 | 2011-08-10 | 湖南大学 | Nondestructive testing method of hard alloy anvil |
| CN104483446A (en) * | 2014-10-28 | 2015-04-01 | 山东大学 | Method for filling fractures and monitoring element burying in underground engineering model test |
| CN105259334A (en) * | 2015-11-28 | 2016-01-20 | 中国科学院武汉岩土力学研究所 | Multi-functional large-scale physical model pouring and loading test device |
| CN106198235A (en) * | 2016-08-25 | 2016-12-07 | 安徽理工大学 | Blasting simulation test device and method based on geomechanical model test |
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- 2017-10-24 CN CN201711096342.8A patent/CN108020464B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1584621A (en) * | 2004-05-28 | 2005-02-23 | 清华大学 | Horizontal magnetic coupler mechanical loading and measuring systems |
| CN102147301A (en) * | 2010-12-28 | 2011-08-10 | 湖南大学 | Nondestructive testing method of hard alloy anvil |
| CN104483446A (en) * | 2014-10-28 | 2015-04-01 | 山东大学 | Method for filling fractures and monitoring element burying in underground engineering model test |
| CN105259334A (en) * | 2015-11-28 | 2016-01-20 | 中国科学院武汉岩土力学研究所 | Multi-functional large-scale physical model pouring and loading test device |
| CN106198235A (en) * | 2016-08-25 | 2016-12-07 | 安徽理工大学 | Blasting simulation test device and method based on geomechanical model test |
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