CN112344861B - Novel method for testing roadway surrounding rock support deformation - Google Patents
Novel method for testing roadway surrounding rock support deformation Download PDFInfo
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- CN112344861B CN112344861B CN202011223701.3A CN202011223701A CN112344861B CN 112344861 B CN112344861 B CN 112344861B CN 202011223701 A CN202011223701 A CN 202011223701A CN 112344861 B CN112344861 B CN 112344861B
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- 239000011248 coating agent Substances 0.000 claims abstract description 27
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- 230000005284 excitation Effects 0.000 claims abstract description 11
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- 230000000694 effects Effects 0.000 claims description 7
- 239000000523 sample Substances 0.000 claims description 7
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical group CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 6
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- 229920000178 Acrylic resin Polymers 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 3
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 3
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- -1 polydimethylsiloxane Polymers 0.000 claims description 3
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Images
Classifications
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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
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/20—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge using brittle lacquer
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
The invention relates to a new method for testing the support deformation of a roadway surrounding rock, which comprises the following steps: 1) spraying a pressure sensitive coating on the surface of the surrounding rock support of the roadway by using a spray gun; 2) after drying, brushing a layer of transparent water-based dustproof coating on the coating; 3) installing an excitation light source system, an image signal acquisition and processing system and a special tripod; 4) when the roadway support and the roadway wall coal rock deform, the pressure sensitive paint irradiated by the excitation light source emits fluorescence with different intensities; 5) the image signal acquisition device captures the fluorescence emitted by the coating and transmits a fluorescence signal to the image processing device through the signal transmission device; 6) and processing the fluorescent signals by using an image processing device to obtain images of the distribution change conditions of the displacement field and the stress field of the roadway support and the roadway wall, and taking safety measures according to actual conditions. The method can be used for rapidly monitoring the roadway surrounding rock support deformation, and has the advantages of small influence of human factors, accurate monitoring data and small influence of external factors.
Description
Technical Field
The invention relates to a new method for testing roadway surrounding rock support deformation, and belongs to the technical field of coal seam mechanical property analysis.
Background
Coal mine dynamic disasters such as rock burst, coal and gas outburst and the like are natural disasters which can occur in coal mine production, have great threat to life and property safety of workers, and provide guidance for preventing accidents by detecting deformation and pressure distribution of a roadway. The existing pressure detection method in actual production generally uses a pressure sensor to detect the stress of a coal bed, firstly, the pressure sensor is placed on the coal bed to be detected, so that an electric signal of the sensor is connected with an operation table, and then, the detection is carried out through manual operation, and the detection method has the problems that manual equipment is expensive, the detection method is complex, and the detection method cannot adapt to severe environments and the like; direct contact methods such as steel hanging ruler leveling and the like are commonly used for deformation detection at present, and although the operation method is simple, the defect that the influence of human factors is too large exists. In order to solve the above problems, it is necessary to provide a detection method with low cost, simple operation and more accuracy.
Disclosure of Invention
The invention aims to solve the technical problem of providing a new method for testing the support deformation of the surrounding rock of the roadway, which can be used for quickly monitoring the support deformation of the surrounding rock of the roadway, and has the advantages of small influence of human factors, accurate monitoring data and small influence of external factors.
In order to solve the above problems, the specific technical scheme of the invention is as follows: a new method for testing roadway surrounding rock support deformation comprises the following steps:
1) spraying the prepared pressure sensitive coating on the surface of the surrounding rock support of the roadway by using a spray gun;
2) after the pressure sensitive paint is completely dried, brushing a layer of transparent water-based dustproof paint on the coating;
3) installing an excitation light source system, an image signal acquisition and processing system and a special tripod;
4) when the stress of surrounding rock of the roadway changes, the stress state of the roadway support changes, so that the roadway support and the coal rock on the roadway wall deform, and the pressure-sensitive paint irradiated by the excitation light source emits fluorescence with different intensities;
5) the image signal acquisition device captures the fluorescence emitted by the coating and transmits a fluorescence signal to the image processing device through the signal transmission device;
6) and processing the fluorescent signals by using an image processing device to obtain images of the distribution change conditions of the displacement field and the stress field of the roadway support and the roadway wall, and taking safety measures according to actual conditions.
The pressure-sensitive paint in the step 1) comprises raw materials of a pressure-sensitive probe, a high-molecular binder and an organic solvent, wherein the luminescent probe is 1-pyridine acid, the high-molecular binder is polydimethylsiloxane, the organic solvent is acetone, and the mass volume ratio of the prepared material to the organic solvent is 12-15 mg:1.4mg:35 ml.
Before the pressure sensitive paint is coated in the step 1), a layer of white reflective primer needs to be coated on a to-be-tested area of the roadway supporting device so as to eliminate the influence on the luminous performance and enhance the reflection effect; the white reflective primer is prepared by mixing acrylic resin as a main component and a directional reflective material titanium dioxide according to the mass part ratio of 3: 1.
In the step 2), the main components of the transparent water-based dustproof coating are organic silicon resin and acrylic elastic emulsion, and the transparent water-based dustproof coating is prepared according to the mass part ratio of 2: 1.
The image information acquisition and processing system in the step 3) comprises an image signal acquisition device which is a high-resolution and high-definition CCD camera, an optical filter and an image processing device; the CCD camera converts the collected fluorescent image into a digital signal, and the digital signal is transmitted to an image processing device through a built-in memory card or a wireless signal transmission device for subsequent processing.
In the step 6), the pressure sensitive paint emits light rays with different intensities at positions subjected to different pressures, the light rays are processed by software and then fed back to images with different color distributions, the displacement between the roadway surface and the support can be analyzed according to the images, the stress condition is deduced through deformation and the reinforcement or organization personnel evacuation is carried out on the area subjected to excessive stress according to actual needs.
The invention has the characteristics that:
(1) the method adopts a mode of smearing the pressure sensitive paint to carry out stress test on the roadway supporting device, can smear on any position to be tested according to actual needs, and has stronger adaptability and convenient operation compared with the existing methods of hanging steel, leveling and the like;
(2) the method utilizes the pressure-sensitive luminescence characteristic of the pressure-sensitive paint to carry out testing, and compared with the existing manual testing method, the method can reduce the labor cost to a certain extent, reduce the influence of human factors on the testing result and obtain more accurate data information;
(3) the traditional PSP measurement method does not generally treat sensitive coatings and is not suitable for the underground working environment with much dust. According to the method, the transparent water-based dustproof coating is additionally coated on the pressure sensitive coating, so that the reflection effect caused by dust covering is prevented from being weakened, and the accuracy of a test result is further ensured;
(4) the tripod is characterized in that a special tripod is designed to adapt to complex underground working environments, the special tripod is different from common tripods in that the foot tube, the middle shaft and the tripod head of the special tripod are all of telescopic structures, and the tripod head and a bracket connected with the middle shaft can be rotatably adjusted in position and angle according to different measurement requirements and are fixed through bolts;
(5) the traditional roadway deformation testing method is characterized in that regular single measurement is carried out on a position to be tested, continuous measurement and observation of change conditions cannot be carried out within a period of time, pressure sensitive paint has pressure sensitive luminous capacity within a certain period of time, and single or continuous image acquisition work can be carried out according to different actual requirements. Along with the change of the stress of the test position, the obtained image can be displayed in different colors, and the stress monitoring can be carried out visually, continuously and in real time.
Drawings
FIG. 1 is a schematic view of the test procedure of example 1.
Fig. 2 is a schematic diagram of a data transmission process in embodiment 1.
Fig. 3 is a schematic view of a tripod special for the embodiment 1.
Fig. 4 is a schematic diagram of the deformation test of surrounding rock of the unsupported roadway in the embodiment 2.
The labels in the figure are: 1-test area; 2-roadway support device; 3-optical filter; 4-excitation light source;
5-CCD camera; 6-special tripod; 7-wireless signal transmission device; 8-image processing means;
9-foot tube; 10-telescopic head; 11-a telescopic middle shaft; 12-fixing the rod; 13-a nut;
14-a tray; 15-transparent silica gel block; 16-a top plate; 17-roadway.
Detailed Description
And a new method for testing the deformation of the roadway surrounding rock support is explained in detail by combining a specific implementation case.
Example 1
A new method for testing deformation of a roadway surrounding rock support comprises the following steps:
1) a layer of white reflective primer is coated on an area 1 to be detected of the roadway support device, the white reflective primer can eliminate the influence of the environment on the luminous performance and enhance the reflective effect, and the main components of the white reflective primer are acrylic resin and directional reflective material titanium dioxide according to the proportion of 3:1 is prepared by mixing the components in parts by mass; spraying the prepared pressure sensitive coating by using a spray gun; the pressure sensitive paint is prepared and comprises a luminescent probe, a high molecular binder and an organic solvent. Wherein the luminescent probe is 1-pyridine acid, the polymer binder is polydimethylsiloxane, the organic solvent is acetone, and the mass volume ratio of the luminescent probe to the polymer binder is 12-15 mg:1.4mg:35 ml;
2) after the pressure sensitive coating is completely dried, brushing a layer of transparent water-based dustproof coating on the pressure sensitive coating to prevent the reflection effect caused by dust coverage from being weakened and further ensure the accuracy of a test result, wherein the main components of the transparent water-based dustproof coating are organic silicon resin and acrylic acid elastic emulsion which are prepared according to the mass part ratio of 2:1, so that the transparent water-based dustproof coating is suitable for the underground working environment with more dust, and the reduction of the reflection effect caused by dust coverage is reduced;
3) installing an excitation light source system, an image signal acquisition and processing system and a special tripod; the method specifically comprises the following steps: a special tripod for supporting supports an excitation light source 4 and a CCD camera 5 respectively, lenses of the light source 4 and the CCD camera 5 point to the test area 1 respectively, and optical filters 3 are arranged on the upper surfaces of the lenses respectively; the data transmission line of the CCD camera 5 is connected with the wireless signal transmission device 7, and the data is displayed after being processed by the image processing device 8;
4) when the stress of the surrounding rock of the roadway changes, the stress state of the roadway support 2 changes, so that the roadway support 2 and the coal rock of the roadway wall deform, and the pressure-sensitive coating irradiated by the excitation light source 4 emits fluorescence with different intensities;
5) the image signal acquisition device 5 captures the fluorescence emitted by the coating, and transmits the fluorescence signal to the image processing device 8 through the signal transmission device 7.
6) And processing the fluorescent signals by using an image processing device 8 to obtain images of the distribution change conditions of the displacement field and the stress field of the roadway support 2 and the roadway wall, and taking safety measures according to actual conditions.
The excitation light source system in the step 3 comprises a light source 4 matched with the optimal absorption wavelength of the coating and an optical filter 3; the image information acquisition and processing system comprises an image signal acquisition device, a wireless signal transmission device 7, an image processing device 8, a CCD camera 5 with high resolution and high definition, an optical filter 3 and an image signal acquisition device; the CCD camera 5 converts the acquired fluorescent image into a digital signal, and the digital signal is transmitted to an image processing device 8 through a built-in memory card or a wireless signal transmission device 7 for subsequent processing; the special tripod 6 is a special bracket for bearing the excitation light source 4 and the CCD camera 5, the angle of the bracket can be adjusted according to different measurement requirements in the horizontal and vertical directions, and the bracket is fixed by bolts.
In the method, the pressure sensitive paint with pressure sensing characteristic is used for testing the roadway support deformation, data acquisition is carried out by shooting through a CCD camera, and an image is obtained after the data acquisition is processed by a computer. The stress distribution condition of the test area can be visually displayed, and the labor cost and the influence of human factors on data are greatly reduced. And because the pressure sensitive coating can be continuously shot for many times, the continuous stress change condition of the roadway support can be detected in real time, the monitoring and early warning effect is achieved, and the life and property safety of personnel is protected.
Example 2
As shown in fig. 4, this embodiment is an application case of the method for the deformation test of the surrounding rock of the non-support roadway, and based on the application of embodiment 1, a tray 14 is connected to the region to be tested 1 through a fixing rod 12 and a nut 13, the prepared pressure-sensitive paint is sprayed on the bottom surface of a transparent silica gel block 15 by using a spray gun, and after the paint is completely dried, the prepared pressure-sensitive paint is placed on the tray 14, and the top surface of the prepared pressure-sensitive paint is pressed on the region to be tested 1. The above procedure was substituted for the procedures of 1) and 2) of example 1, and the rest of the procedure was the same as in example 1.
The method can be used for simultaneously carrying out deformation test on surrounding rocks of a plurality of roadways, and the measurement error caused by human factors can be effectively reduced by utilizing the characteristics of the sensitive coating.
The above description is only for the purpose of illustrating the technical solutions of the present invention and not for the purpose of limiting the same, and other modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention should be covered within the scope of the claims of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (6)
1. A new method for testing roadway surrounding rock support deformation comprises the following steps:
1) connecting a tray on a to-be-detected area on the supporting surface of the surrounding rock of the roadway through a fixing rod and a nut, spraying the prepared pressure-sensitive coating on the bottom surface of the transparent silica gel block by using a spray gun, placing the transparent silica gel block on the tray after the coating is completely dried, and pressing the top surface of the transparent silica gel block on the to-be-detected area;
2) installing an excitation light source system, an image signal acquisition and processing system and a special tripod;
3) when the stress of surrounding rock of the roadway changes, the stress state of the roadway support changes, so that the roadway support and the coal rock on the roadway wall deform, and the pressure-sensitive paint irradiated by the excitation light source emits fluorescence with different intensities;
4) the image signal acquisition device captures the fluorescence emitted by the coating and transmits a fluorescence signal to the image processing device through the signal transmission device;
5) and processing the fluorescent signals by using an image processing device to obtain images of the distribution change conditions of the displacement field and the stress field of the roadway support and the roadway wall, and taking safety measures according to actual conditions.
2. The new roadway surrounding rock support deformation testing method of claim 1, characterized in that: the pressure-sensitive paint in the step 1) comprises raw materials of a pressure-sensitive probe, a high-molecular binder and an organic solvent, wherein the luminescent probe is 1-pyridine acid, the high-molecular binder is polydimethylsiloxane, the organic solvent is acetone, and the mass volume ratio of the prepared material to the organic solvent is 12-15 mg:1.4mg:35 ml.
3. The new roadway surrounding rock support deformation testing method of claim 1, characterized in that: before the pressure sensitive paint is coated in the step 1), a layer of white reflective primer needs to be coated on a to-be-tested area of the roadway supporting device so as to eliminate the influence on the luminous performance and enhance the reflection effect; the white reflective primer is prepared by mixing acrylic resin as a main component and a directional reflective material titanium dioxide according to the mass part ratio of 3: 1.
4. The new roadway surrounding rock support deformation testing method of claim 1, characterized in that: in the step 2), the main components of the transparent water-based dustproof coating are organic silicon resin and acrylic elastic emulsion, and the transparent water-based dustproof coating is prepared according to the mass part ratio of 2: 1.
5. The new roadway surrounding rock support deformation testing method of claim 1, characterized in that: the image information acquisition and processing system in the step 3) comprises an image signal acquisition device which is a high-resolution and high-definition CCD camera, an optical filter and an image processing device; the CCD camera converts the collected fluorescent image into a digital signal, and the digital signal is transmitted to an image processing device through a built-in memory card or a wireless signal transmission device for subsequent processing.
6. The new roadway surrounding rock support deformation testing method of claim 1, characterized in that: in the step 6), the pressure sensitive paint emits light rays with different intensities at positions subjected to different pressures, the light rays are processed by software and then fed back to images with different color distributions, the displacement between the roadway surface and the support can be analyzed according to the images, the stress condition is reversely deduced through deformation, and the areas subjected to overlarge stress are reinforced or the organization personnel are evacuated by combining with actual needs.
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| CN113155399B (en) * | 2021-04-06 | 2022-10-21 | 中国空气动力研究与发展中心高速空气动力研究所 | Synchronous measurement method for three-dimensional continuous distribution of surface pressure and deformation of high-speed aircraft |
| CN115371560B (en) | 2022-09-13 | 2023-08-29 | 山东科技大学 | Working face hydraulic support base group state sensing description method |
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