Method for identifying influence of overlying strata migration on hydraulic support mine pressure appearance

Abstract

The invention provides a method for identifying the influence of overlying strata migration on hydraulic support mine pressure appearance. The method comprises the following steps: performing a simulation test based on a preset stope similar physical model to obtain respective feature images of a stope before and after each excavation time step; based on the feature image, determining a relative displacement field of the stope before and after each excavation time step; based on a stope similar physical model, determining deformation characteristics of the hydraulic support before and after each excavation time step; based on the relative displacement field, relative overlying strata migration characteristics of the stope are determined; based on the relative overlying strata migration characteristics and the deformation characteristics, the mapping relation between overlying strata migration and hydraulic support mine pressure display is determined, and the mine pressure display of the hydraulic support is recognized based on the mapping relation. Therefore, according to the scheme, the overlying strata migration rule influencing the hydraulic support mine pressure display can be clearly determined, and method support is provided for essential analysis of the overlying strata migration rule and the hydraulic support mine pressure display in an analog simulation test.

Description

Technical Field

[0001] The present application relates to the technical field of coal mining, and in particular to a method for identifying the influence of overburden migration on the mine pressure manifestation of hydraulic supports. Background Art

[0002] Similarity simulation test is an important research method to study the overburden movement in the mining area and the manifestation of mine pressure on hydraulic supports. It can, on the basis of truly simulating the actual conditions of coal mine on-site engineering, rely on various advanced monitoring technologies to grasp the characteristics of overburden movement in the mining area as the working face advances, the manifestation of mine pressure on hydraulic supports and the evolution law of mining stress, providing a reliable research method for revealing the interaction between the support and surrounding rock in ultra-large mining height and high-strength mining working faces. Summary of the invention

[0003] The purpose of this application is to solve one of the technical problems in the related art at least to some extent.

[0004] To this end, the first purpose of the present application is to propose a method for identifying the influence of overburden migration on the mine pressure manifestation of a hydraulic support, so as to accurately identify the mine pressure manifestation of the hydraulic support.

[0005] The second purpose of the present application is to provide a device for identifying the effect of overburden migration on the mining pressure of hydraulic supports.

[0006] To achieve the above-mentioned purpose, the first aspect of the present application proposes a method for identifying the influence of overburden movement on the manifestation of mine pressure of hydraulic supports, including: conducting simulation tests based on a preset similar physical model of a mining field to obtain characteristic images of the mining field before and after each excavation step; based on the characteristic images, determining the relative displacement field of the mining field before and after each excavation step; based on the similar physical model of the mining field, determining the deformation characteristics of the hydraulic support before and after each excavation step, the hydraulic support is installed on the working face of the mining field, and the deformation characteristics at least include the shrinkage characteristics of the columns of the hydraulic support; based on the relative displacement field, determining the relative overburden movement characteristics of the mining field; based on the relative overburden movement characteristics and the deformation characteristics, determining the mapping relationship between overburden movement and the manifestation of mine pressure of the hydraulic support, and identifying the manifestation of mine pressure of the hydraulic support based on the mapping relationship.

[0007] To achieve the above-mentioned purpose, the second embodiment of the present application proposes an identification device for the influence of overburden movement on the manifestation of mine pressure of hydraulic support, including: an acquisition module, which is used to perform simulation tests based on a preset similar physical model of the mining field to obtain the characteristic images of the mining field before and after each excavation step; a first determination module, which is used to determine the relative displacement field of the mining field before and after each excavation step based on the characteristic image; a second determination module, which is used to determine the deformation characteristics of the hydraulic support before and after each excavation step based on the similar physical model of the mining field, the hydraulic support is installed on the working face of the mining field, and the deformation characteristics at least include the shrinkage characteristics of the columns of the hydraulic support; a third determination module, which is used to determine the relative overburden movement characteristics of the mining field based on the relative displacement field; a fourth determination module, which is used to determine the mapping relationship between overburden movement and the manifestation of mine pressure of the hydraulic support based on the relative overburden movement characteristics and the deformation characteristics, and identify the manifestation of mine pressure of the hydraulic support based on the mapping relationship.

[0008] The present application provides a method for identifying the influence of overburden migration on the manifestation of hydraulic support pressure. The method uses a similar physical model of the mining field to conduct experiments, and obtains characteristic images before and after excavation during the excavation process, so as to determine the relative displacement field of the excavation time step according to the characteristic images. By determining the deformation characteristics of the hydraulic support during the excavation process, and obtaining the relative overburden migration characteristics from the relative displacement field, a mapping relationship between overburden migration and the manifestation of hydraulic support pressure is established according to the relative overburden migration characteristics and deformation characteristics, so that the manifestation of hydraulic support pressure can be identified according to the mapping relationship. According to the mapping relationship, the overburden migration law that affects the manifestation of hydraulic support pressure can be clarified, and the method support is provided for the essential analysis of the overburden migration law and the manifestation of hydraulic support pressure in similar simulation experiments, thereby providing a basis for preventing and controlling the occurrence of hydraulic support pressure accidents underground during coal mining, and greatly reducing the initial investment cost of coal mining.

[0009] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0011] Figure 1 A schematic flow chart of a method for identifying the effect of overburden migration on the mine pressure manifestation of a hydraulic support provided in an embodiment of the present application;

[0012] Figure 2 A schematic flow chart of another method for identifying the effect of overburden migration on the mine pressure manifestation of a hydraulic support provided in an embodiment of the present application;

[0013] Figure 3 Binarized cloud images corresponding to four different relative displacements after excavation of 120 cm provided in the embodiment of the present application;

[0014] Figure 4 Binarized cloud images corresponding to four different relative displacements after excavation of 200 cm provided in the embodiment of the present application;

[0015] Figure 5 A statistical diagram of relative overburden migration area in a binary cloud diagram of different relative displacements before and after excavation of a similar stope model provided in an embodiment of the present application;

[0016] Figure 6 A statistical schematic diagram of the relative overburden migration area in the binary cloud map directly above the hydraulic support provided in the embodiment of the present application;

[0017] Figure 7 A binary cloud map corresponding to the target overburden migration range provided in the embodiment of the present application;

[0018] Figure 8 A statistical diagram of the relative overburden migration area within a range of 1-10 mm directly above the hydraulic support provided in the embodiment of the present application;

[0019] Fig. 9 A linear diagram of the maximum downward shrinkage deformation of the hydraulic support column provided in the embodiment of the present application and the relative overburden migration area within the range of 1-10 mm directly above the hydraulic support;

[0020] Fig.10 A schematic flow chart of another method for identifying the effect of overburden migration on the mine pressure manifestation of a hydraulic support provided in an embodiment of the present application;

[0021] Fig.11a A schematic diagram of reference pixels in a reference sub-region provided in an embodiment of the present application;

[0022] Fig.11b A schematic diagram of a target pixel point in a target sub-region provided in an embodiment of the present application;

[0023] Fig.12 A schematic diagram of displacement analysis provided in an embodiment of the present application;

[0024] Fig.13 A schematic flow chart of a hydraulic support verification process in a method for identifying the effect of overburden migration on the mine pressure manifestation of a hydraulic support provided in an embodiment of the present application;

[0025] Fig.14 A schematic diagram of a calibration device for a hydraulic support provided in an embodiment of the present application;

[0026] Fig.15A schematic diagram of the fitting relationship between the bracket oil pressure and the bracket force provided in the embodiment of the present application;

[0027] Fig.16 A schematic diagram of a flow chart of determining the deformation characteristics of a hydraulic support in a method for identifying the influence of overburden migration on the manifestation of mine pressure of a hydraulic support provided in an embodiment of the present application;

[0028] Fig.17 A schematic diagram for quantitatively characterizing deformation characteristics of a hydraulic support provided in an embodiment of the present application;

[0029] Fig.18a A schematic diagram of a displacement measurement line of a hydraulic support provided in an embodiment of the present application;

[0030] Fig.18b A schematic diagram of measuring the elevation angle of a hydraulic support after excavation provided in an embodiment of the present application;

[0031] Fig.19 A schematic diagram of a relative vertical displacement curve of a displacement measurement line directly above a hydraulic support provided in an embodiment of the present application along the length direction of the top beam of the hydraulic support;

[0032] Fig. 20 A relationship curve between the maximum downward contraction of the hydraulic support column provided in the embodiment of the present application and the average vertical displacement of the displacement measurement line;

[0033] Fig.21a A relationship curve between the measuring point A and the maximum downward shrinkage of the hydraulic support column provided in the embodiment of the present application;

[0034] Figure 21b A relationship curve between the measuring point B and the maximum downward shrinkage of the hydraulic support column provided in the embodiment of the present application;

[0035] Fig. 22 A relationship curve between the migration inclination angle and the maximum downward shrinkage of the support column provided in the embodiment of the present application;

[0036] Fig.23 A schematic diagram of the structure of a device for identifying the effect of overburden migration on the mine pressure of a hydraulic support provided in an embodiment of the present application. DETAILED DESCRIPTION

[0037] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0038] The following describes a method and device for identifying the effect of overburden migration on the mine pressure manifestation of a hydraulic support according to an embodiment of the present application with reference to the accompanying drawings.

[0039] Figure 1 : is a flow chart of a method for identifying the influence of overburden migration on the mine pressure manifestation of hydraulic support provided in an embodiment of the present application, such as Figure 1 As shown, the method for identifying the influence of overburden migration on the mine pressure manifestation of hydraulic support in the embodiment of the present application includes but is not limited to the following steps:

[0040] S101, performing a simulation test based on a preset stope similarity physical model to obtain characteristic images of the stope before and after each excavation time step.

[0041] It should be noted that the execution subject of the method for identifying the influence of overburden migration on the hydraulic support mine pressure manifestation provided in the embodiment of the present application is an electronic device, and the electronic device can be a terminal device. Optionally, the terminal device can be a mobile electronic device or a non-mobile electronic device. Exemplarily, the mobile electronic device can be a mobile phone, a tablet computer, a laptop computer, a PDA, an in-vehicle electronic device, a wearable device, an ultra-mobile personal computer (UMPC), a netbook or a personal digital assistant (PDA), etc., and the non-mobile electronic device can be a personal computer (PC), a television, etc. The embodiment of the present application is not specifically limited.

[0042] It can be understood that the stope similarity physical model is a physical model established based on similarity theory, which is used to simulate and study the actual mining process of a stope (such as a coal mine stope) and its related mechanical motion and characteristics. The basic principle of the stope similarity physical model is the similarity theory, that is, between different systems or phenomena, if their geometric shapes, physical processes, and mechanical properties are similar in a certain proportion, then there is a certain similarity law between them. In the stope similarity physical model, it is usually necessary to consider the similarity of multiple aspects such as geometric similarity, time similarity, stress and strength similarity, etc.

[0043] In some embodiments, a similar physical model of the stope is laid out, and a simulation test is performed based on the similar physical model of the stope. During the simulation test, images are collected before and after each excavation step to obtain a characteristic image.

[0044] Optionally, a Digital Image Correlation (DIC) camera may be set up in front of the stope-like physical model, and the DIC camera may be used to collect images.

[0045] In some embodiments, after the similar model of the stope is laid, the model guard is removed to allow the model to dry sufficiently to ensure that the model material reaches the target material strength under dry conditions. Furthermore, a DIC speckle production tool is used to produce speckle feature points on the model surface, and a random speckle feature image is collected by a DIC camera as a feature image before and after each excavation time step, so that the feature image can reflect deformation information.

[0046] In some embodiments, before laying the similar physical model of the mining area, the similarity ratios of different candidate similar physical models can be matched with the physical ratios of various rock formations in the coal mine, and a matching similar physical model of the mining area can be selected and laid.

[0047] In some embodiments, the geometric similarity scale of the stope physical similarity model is C L =L P / L M , the bulk density similarity ratio is C ρ =ρ P / ρ M , the stress similarity ratio is C σ =σ P / σ M , where P represents the actual model conditions of the on-site engineering, and M represents the similar model conditions, and then matching can be performed based on geometric similarity, bulk density similarity, and stress similarity.

[0048] S102, based on the characteristic image, determining the relative displacement field of the stope before and after each excavation time step.

[0049] In some embodiments, the feature image is divided into sub-regions, and the position of the center point of the square sub-region in the feature image sub-region is tracked to calculate the displacement vector value of the center point, thereby obtaining the relative displacement field in the feature image.

[0050] In some implementations, by determining a first characteristic image before an excavation step and a second characteristic image after an excavation step, the displacement vector value of the center point in a sub-region in the first characteristic image is determined by calculating the position of the center point in the second characteristic image, and then based on the position vector value of the center point in each sub-region, the relative displacement field of the mining area before and after each excavation step can be obtained.

[0051] That is to say, the first characteristic image can be used as a base reference image, and the second characteristic image can be used as a deformed image. By calculating the relative displacement between the deformed image and the base reference image, a relative displacement field can be obtained.

[0052] S103, based on a similar physical model of the stope, determining deformation characteristics of the hydraulic support before and after each excavation time step, the hydraulic support being installed on the working surface of the stope, and the deformation characteristics at least including a shrinkage characteristic of a column of the hydraulic support.

[0053] In some embodiments, a mining field similarity model is used and during the mining process, a hydraulic support is installed at the working face to support the working face roof. That is to say, during the excavation process, the hydraulic support will be subjected to various forces such as roof pressure and bottom plate reaction force, causing deformation, resulting in stress on the hydraulic support, the safety valve of the hydraulic support opens, and the column shrinks.

[0054] That is to say, the stress characteristics of the hydraulic support, the opening state of the safety valve and the shrinkage characteristics of the column can be used as the deformation characteristics of the hydraulic support.

[0055] In some embodiments, the fitting relationship between the force and time of the hydraulic support can be obtained as the force characteristic. For example, the fitting relationship can be obtained by drawing a curve of the force and time data.

[0056] In some embodiments, the fitting relationship between the hydraulic support column retraction and time is plotted as the column retraction feature. For example, a curve of column retraction and time data is plotted to obtain the fitting relationship.

[0057] In some embodiments, it is determined whether the force applied to the hydraulic support reaches the opening pressure of the safety valve, and when the opening pressure is reached, it is determined that the safety valve is opened, so as to determine the opening state of the safety valve.

[0058] S104, determining the relative overburden migration characteristics of the stope based on the relative displacement field.

[0059] In some embodiments, a binary cloud map of the relative displacement field is obtained, and the relative overburden migration area is determined from the binary cloud map, and the relative overburden migration area is used as the relative overburden migration feature of the mining area.

[0060] In some embodiments, the binary cloud map consists of 0 and 1. The relative overburden migration area can be obtained by obtaining a connected area with a value of 1 as the relative overburden migration range and performing area statistics on the relative overburden migration range.

[0061] Optionally, the values ​​0 and 1 have different colors. If the value 0 is gray and the value 1 is black, the black connected area is determined to be the relative overburden migration range.

[0062] In some embodiments, in order to make the relative overburden migration characteristics directly correlated with the deformation characteristics of the hydraulic support, the relative overburden migration range within a set range directly above the hydraulic support can be obtained as the relative overburden migration characteristics of the mining area.

[0063] S105, based on the relative overburden migration characteristics and deformation characteristics, determine the mapping relationship between the overburden migration and the hydraulic support's mine pressure manifestation, and identify the hydraulic support's mine pressure manifestation based on the mapping relationship.

[0064] In some embodiments, a mapping relationship between relative overburden migration and deformation characteristics can be established as a mapping relationship between overburden migration and hydraulic support pressure manifestation, wherein the mapping relationship reflects the influence of overburden migration on the stress state of the hydraulic support and the response of the hydraulic support deformation to overburden migration.

[0065] In some embodiments, the column shrinkage feature of the hydraulic support can be determined from the deformation feature by analyzing the correlation between the relative overburden migration area and the column shrinkage feature, and establishing a mapping relationship using a linear regression method.

[0066] That is to say, the linear relationship between the shrinkage characteristics of the column and the target overburden migration area can be determined, and the linear relationship can be used as a mapping relationship between the overburden migration and the mining pressure manifestation of the hydraulic support.

[0067] In some embodiments, based on the determined mapping relationship, it is determined whether mine pressure will occur during the excavation process to accurately identify the mine pressure of the hydraulic support. By taking support measures in advance, accidents such as support failure and roof collapse can be avoided to ensure the safety of personnel and equipment.

[0068] In the method for identifying the influence of overburden migration on the manifestation of hydraulic support pressure provided in the embodiment of the present application, a test is conducted by using a similar physical model of the mining field, and characteristic images before and after excavation are obtained during the excavation process, so as to determine the relative displacement field of the excavation time step according to the characteristic images. By determining the deformation characteristics of the hydraulic support during the excavation process, and obtaining the relative overburden migration characteristics from the relative displacement field, a mapping relationship between overburden migration and the manifestation of hydraulic support pressure is established according to the relative overburden migration characteristics and the deformation characteristics, so that the manifestation of hydraulic support pressure can be identified according to the mapping relationship. According to the mapping relationship, the overburden migration law that affects the manifestation of hydraulic support pressure can be clarified, providing method support for the essential analysis of the overburden migration law and the manifestation of hydraulic support pressure in similar simulation experiments, thereby providing a basis for preventing and controlling the occurrence of hydraulic support pressure accidents underground during coal mining, and greatly reducing the initial investment cost of coal mining.

[0069] Figure 2 : is a flow chart of a method for identifying the influence of overburden migration on the mine pressure manifestation of hydraulic support provided in an embodiment of the present application, such as Figure 2 As shown, the method for identifying the influence of overburden migration on the mine pressure manifestation of hydraulic support in the embodiment of the present application includes but is not limited to the following steps:

[0070] S201, performing a simulation test based on a preset stope similarity physical model to obtain characteristic images of the stope before and after each excavation time step.

[0071] In the embodiment of the present application, the implementation method of step S201 can be implemented by any method in the embodiments of the present application, which is not limited here and will not be repeated.

[0072] S202, based on the characteristic image, determining the relative displacement field of the stope before and after each excavation time step.

[0073] In the embodiment of the present application, the implementation method of step S202 can be implemented by any method in the embodiments of the present application, which is not limited here and will not be repeated.

[0074] S203, based on a similar physical model of the stope, determining deformation characteristics of the hydraulic support before and after each excavation time step, the hydraulic support being installed on the working surface of the stope, and the deformation characteristics at least including a shrinkage characteristic of a column of the hydraulic support.

[0075] In the embodiment of the present application, the implementation method of step S203 can be implemented by any method in the embodiments of the present application, which is not limited here and will not be repeated.

[0076] S204, obtaining a binary cloud image corresponding to the relative displacement field.

[0077] In some embodiments, the relative displacement field may be binarized according to a set displacement threshold, thereby obtaining a binarized cloud map corresponding to the relative displacement field.

[0078] For example, by determining a displacement threshold, marking the relative displacement in the relative displacement field greater than the displacement threshold as 1, and marking the relative displacement in the relative displacement field less than the displacement threshold as 0, a binarization processing result is obtained, and then a binarization cloud map can be generated according to the binarization processing result.

[0079] For example, Figure 3 The figure shows the binary cloud images corresponding to four different relative displacements after excavation of 120 cm, where (a) indicates that the displacement is greater than 1 mm, (b) indicates that the displacement is greater than 2 mm, (c) indicates that the displacement is greater than 16 mm, and (d) indicates that the displacement is greater than 20 mm.

[0080] Figure 4 The figure shows the binary cloud images corresponding to four different relative displacements after excavation of 200 cm, where (a) indicates that the displacement is greater than 1 mm, (b) indicates that the displacement is greater than 2 mm, (c) indicates that the displacement is greater than 16 mm, and (d) indicates that the displacement is greater than 20 mm.

[0081] S205, determining the connected area of ​​the target color in the binary cloud image, and taking the connected area as the relative overburden migration range.

[0082] In some embodiments, the binary cloud map includes values ​​0 and 1, which correspond to two candidate colors respectively. The target color is determined from the candidate colors, and the connected area of ​​the target color is used as the relative overburden migration range.

[0083] In some embodiments, the candidate color corresponding to the value 1 may be used as the target color, and a connected area of ​​the target color may be determined as the relative overburden migration range.

[0084] S206, quantitatively characterizing the relative overburden migration range, and obtaining a relative overburden migration area corresponding to the relative overburden migration range as a relative overburden migration feature.

[0085] In some embodiments, the relative overburden migration range is statistically analyzed to achieve quantitative characterization of the relative overburden migration range, thereby obtaining the relative overburden migration area corresponding to the relative overburden migration range, and using the relative overburden migration area as the relative overburden migration feature.

[0086] Figure 5 Shown is a statistical diagram of relative overburden migration area in the binary cloud map of different relative displacements of the stope similarity model before and after excavation. Figure 5 The relative displacements are: greater than 1mm, greater than 2mm, greater than 16mm and greater than 20mm. The statistical results of the overburden migration area in 4 different binary cloud maps and the hydraulic support stress, safety valve opening state and column shrinkage were analyzed. It was found that after the working face was excavated to 155cm, 180cm and 200cm, the hydraulic support had strong mine pressure, and the migration area of ​​the overburden in 4 different ranges was also significantly larger, reflecting the correlation characteristics of the strong migration of overburden leading to the hydraulic support mine pressure.

[0087] In some embodiments, in order to more accurately establish the mapping relationship between overburden migration and the mineral pressure manifestation of the hydraulic support, the relative overburden migration area directly above the hydraulic support can be counted and used as the relative overburden migration feature.

[0088] Figure 6 What is shown is a statistical schematic diagram of the relative overburden migration area in the binary cloud map directly above the hydraulic support. Figure 6 In the figure, 1 represents the hydraulic support and 2 represents the statistical area directly above the hydraulic support.

[0089] In some embodiments, a target overburden migration range within a set range directly above the hydraulic support can be determined from the relative overburden migration range, and the target overburden migration range can be quantitatively characterized to obtain a target overburden migration area, so that the target overburden migration area can be used as a relative overburden migration feature.

[0090] Figure 7 The binary cloud map corresponding to the migration range of the target overburden is shown. Figure 7 It includes: (a) the binary cloud map corresponding to the target overburden migration range when the working face is excavated 120cm, and (b) the binary cloud map corresponding to the target overburden migration range when the working face is excavated 200cm.

[0091] S207, determining a mapping relationship between overburden migration and the manifestation of rock pressure in the hydraulic support based on the relative overburden migration characteristics and deformation characteristics, and identifying the manifestation of rock pressure in the hydraulic support based on the mapping relationship.

[0092] In the embodiment of the present application, the implementation method of step S207 can be implemented by any method in the embodiments of the present application, which is not limited here and will not be repeated.

[0093] In the identification method of the influence of overburden migration on the hydraulic support pressure manifestation provided in the embodiment of the present application, a mapping relationship between overburden migration and hydraulic support pressure manifestation is established by obtaining a binary cloud map of the relative displacement field and determining the relative overburden migration characteristics based on the binary cloud map. According to the mapping relationship, the overburden migration law that affects the hydraulic support pressure manifestation can be clearly identified, providing method support for the essential analysis of the overburden migration law and the hydraulic support pressure manifestation in similar simulation tests, thereby providing a basis for preventing and controlling hydraulic support pressure accidents in the underground during coal mining, and greatly reducing the initial investment cost of coal mining.

[0094] Based on any of the above embodiments, the method includes performing area statistics on the relative overburden migration range within a range of 1-10 mm directly above the hydraulic support, and the statistical results are as follows: Figure 8 As shown. Figure 8It can be seen that when the working face is excavated to 155cm, 180cm and 200cm, there is a significant large-scale overburden migration directly above the hydraulic support, which leads to increased stress on the hydraulic support, opening of the safety valve and shrinkage of the column. Moreover, the relative overburden migration area of ​​the overburden directly above the hydraulic support in the range of 1-10mm before and after excavation is consistent with the shrinkage result of the hydraulic support column, that is, the more significant the shrinkage of the hydraulic support column, the larger the relative overburden migration area of ​​the overburden directly above the hydraulic support in the range of 1-10mm before and after excavation. When the working face is excavated to 155cm, 180cm and 200cm, the maximum shrinkage of the hydraulic support column is 0.35mm, 0.27mm and 1.35mm respectively, and the relative overburden migration area in the range of 1-10mm before and after excavation directly above the support is 0.0369m2, 0.028m2 and 0.1363m2 respectively. Except for these three excavation time steps, the support column has no obvious shrinkage in the other excavation time steps, and the relative overburden migration area within 1-10mm above the support is also 0. Through the fitting analysis of the maximum shrinkage of the support column and the relative overburden migration area within 1-10mm above the hydraulic support, it can be determined that the maximum shrinkage deformation of the hydraulic support column and the relative overburden migration area within 1-10mm above the hydraulic support show a good linear relationship. The linear relationship is as follows: Fig. 9 As shown, it is a quantitative index indicating the relative displacement area statistics before and after the excavation of the overburden above the hydraulic support, which can be used to quantitatively reflect the strong mining pressure generated by the hydraulic support driven by the overburden movement.

[0095] Fig.10 : is a flow chart of a method for identifying the influence of overburden migration on the mine pressure manifestation of hydraulic support provided in an embodiment of the present application, such as Fig.10 As shown, the method for identifying the influence of overburden migration on the mine pressure manifestation of hydraulic support in the embodiment of the present application includes but is not limited to the following steps:

[0096] S1001, performing a simulation test based on a preset stope similarity physical model to obtain characteristic images of the stope before and after each excavation time step.

[0097] In the embodiment of the present application, the implementation method of step S1001 can be implemented by any method in the embodiments of the present application, which is not limited here and will not be repeated.

[0098] S1002: for any excavation time step, determine a first characteristic image before any excavation time step and a second characteristic image after any excavation time step.

[0099] S1003, determining a first sub-region plane set and a second sub-region plane set corresponding to the first feature image and the second feature image, wherein a first sub-region in the first sub-region plane set and a second sub-region in the second sub-region plane set have a corresponding relationship.

[0100] In some embodiments, by taking the characteristic image before any excavation time step as the first characteristic image and the characteristic image after any excavation time step as the second characteristic image, and dividing the first characteristic image and the second characteristic image into sub-regions, a first sub-region plane set corresponding to the first characteristic image and a second sub-region plane set corresponding to the second characteristic image can be obtained.

[0101] In some embodiments, there is a correspondence between the first sub-region in the first sub-region plane set and the second sub-region in the second sub-region plane set, that is, there is a correspondence between the pixel points in the first sub-region and the pixel points in the second sub-region.

[0102] For example, the first feature image is the image before deformation, and the second feature image is the image after deformation. Then the pixel point A in the first sub-region in the first sub-region plane set is the pixel point before deformation, and the pixel point A′ in the second sub-region in the second sub-region plane set is the pixel point corresponding to pixel point A after deformation.

[0103] S1004: Take any first sub-region in the first sub-regions as a reference sub-region, and determine a second sub-region corresponding to the reference sub-region as a target sub-region.

[0104] S1005: Determine a relative displacement field based on the reference sub-region and the target sub-region.

[0105] In some embodiments, by taking any first sub-region in the first sub-region as a reference sub-region, that is, taking the first characteristic image as a reference characteristic image, and based on the correspondence between the first sub-region and the second sub-region, determining the second sub-region corresponding to the reference sub-region as the target sub-region, that is, taking the second characteristic image as the deformed image.

[0106] In some embodiments, by determining corresponding pixels in the reference sub-region and the target sub-region, calculating the displacement value of the second feature image based on the pixels, and further calculating the target displacement value of each target sub-region, a relative displacement field can be obtained.

[0107] That is, by determining a reference pixel from the reference sub-region and determining a target pixel corresponding to the reference pixel from the target sub-region, and then performing displacement analysis on the reference pixel and the target pixel, a displacement value corresponding to the target sub-region is obtained.

[0108] Furthermore, based on the reference pixels in each reference sub-region and the target pixels in each target sub-region, the target displacement value corresponding to each target sub-region in the second feature image can be determined, so that the relative displacement field can be determined based on the target displacement value.

[0109] For example, Fig.11a What is shown is a schematic diagram of reference pixels in a reference sub-region. Fig.11a The reference pixel points include point P(x 0 ,y 0 ) and point Q(x i ,y i ). Fig.11b What is shown is a schematic diagram of the target pixel point in the target sub-area. Fig.11b The target pixels corresponding to the reference pixels P and Q are P′(x 0 ′,y 0 ′) and Q′(x i ′,y i ′).

[0110] Furthermore, displacement analysis can be performed on point P and point Q. The schematic diagram of displacement analysis is shown in Fig.12 As shown by Fig.12 It can be seen that P′ can be calculated based on point P. The calculation formula is as follows:

[0111]

[0112] Among them, u is the component of point P' on the x-axis, and v is the component of point P' on the y-axis.

[0113] Depend on Fig.12 It can be seen that Q′ can be calculated based on point Q. The calculation formula is as follows:

[0114]

[0115] Among them, u Q is the component of point Q′ on the x-axis, v Q is the component of point Q′ on the y-axis.

[0116] Furthermore, the grayscale value of point Q′ before and after deformation is determined as follows:

[0117]

[0118] Among them, f(Q) is the grayscale value before deformation, and g(Q) is the grayscale value after deformation.

[0119] Optionally, the relationship between the component of point Q′ on the x-axis and the component of point Q′ on the y-axis, and the component of point P′ on the x-axis and the component of point P′ on the y-axis is:

[0120]

[0121] Among them, Δx is the difference between point P and point Q on the x-axis, and Δy is the difference between point P and point Q on the y-axis.

[0122] By defining the displacement value P = [uu x u y vv x v y ]T, and measure the similarity between the first feature image and the second feature image based on the correlation coefficient, and determine the value of P when the correlation coefficient is minimum as the displacement value corresponding to the target sub-region.

[0123] The formula for measuring the similarity between the first feature image and the second feature image is as follows:

[0124] C(f,g)=C(x i ,y i ,x′,y i ′)(5)

[0125] The formula for determining the minimum correlation coefficient is as follows:

[0126]

[0127] S1006, based on a similar physical model of the stope, determining deformation characteristics of the hydraulic support before and after each excavation time step, the hydraulic support being installed on the working surface of the stope, and the deformation characteristics at least including a shrinkage characteristic of a column of the hydraulic support.

[0128] In the embodiment of the present application, the implementation method of step S1006 can be implemented by any method in the embodiments of the present application, which is not limited here and will not be repeated.

[0129] S1007, based on the relative displacement field, determine the relative overburden migration characteristics of the mining area.

[0130] In the embodiment of the present application, the implementation method of step S1007 can be implemented by any method in the embodiments of the present application, which is not limited here and will not be repeated.

[0131] S1008, based on the relative overburden migration characteristics and deformation characteristics, determine the mapping relationship between the overburden migration and the hydraulic support's mine pressure manifestation, and identify the hydraulic support's mine pressure manifestation based on the mapping relationship.

[0132] In the embodiment of the present application, the implementation method of step S1008 can be implemented by any method in the embodiments of the present application, which is not limited here and will not be repeated.

[0133] In the method for identifying the influence of overburden migration on the hydraulic support mine pressure manifestation provided by the embodiment of the present application, the relative displacement field of the excavation time step is calculated according to the pixel points of the sub-area in the first characteristic image and the second characteristic image. Therefore, by determining the relative displacement field according to the pixel points, the accuracy of the relative displacement field calculation can be improved, and the visual analysis of the relative displacement field can be realized.

[0134] Based on the above embodiments, the embodiments of the present application can explain the process of checking the hydraulic support, such as Fig.13 As shown, the process of checking the hydraulic support in the embodiment of the present application includes but is not limited to the following steps:

[0135] S1301, calibrating the support oil pressure of the hydraulic support. During the calibration process, the support force of the hydraulic support is obtained, and the support oil pressure corresponding to each support force is determined.

[0136] S1302, determining the fitting relationship between the bracket oil pressure and the bracket force.

[0137] Fig.14 The figure shows the calibration device of the hydraulic support. Fig.14 In the figure, 1 is a support hydraulic column, 2 is a support displacement monitoring sensor, 3 is a support top beam, 4 is a support bottom beam, 5 is a force sensor, and 6 is a reaction device.

[0138] In some embodiments, the hydraulic support is placed in a reaction device, a force sensor is placed above the hydraulic support, and hydraulic oil is injected into the hydraulic support to make the support column rise. After the force sensor above the support contacts the top of the reaction device, the force on the support is measured by the force sensor.

[0139] In some embodiments, hydraulic oil is slowly injected into the hydraulic column of the support, and the sensor force is recorded once every time the set oil pressure is increased, so as to obtain the support force of the hydraulic support and determine the support oil pressure corresponding to each support force. For example, the sensor force can be recorded once every time the oil pressure increases by 20kPa.

[0140] Optionally, after obtaining the force on the bracket, it is determined whether to stop injecting the hydraulic oil based on the force on the bracket, and in response to the force on the bracket reaching the rated working pressure, the injection of the hydraulic oil is stopped.

[0141] In some embodiments, by performing fitting analysis on the bracket oil pressure and bracket force, the friction resistance of the hydraulic bracket and the fitting formula of the bracket oil pressure and bracket force after the friction resistance is reached can be determined. The fitting formula is as follows:

[0142] y=kx+b(7)

[0143] Among them, y is the force on the bracket, x is the bracket oil pressure, k is the bracket stiffness, and b is the friction resistance.

[0144] Fig.15 The figure shows the fitting relationship between the bracket oil pressure and the bracket force. Fig.15 It can be seen that the fitting relationship between the bracket oil pressure and the bracket force is approximately a function of y = 0.8749x-53.074, where R 2 Indicates the degree of fit, the closer it is to 1, the better the fit.

[0145] In the method for identifying the effect of overburden migration on the mine pressure manifestation of a hydraulic support provided in the embodiment of the present application, the hydraulic support can be checked before the deformation characteristics of the hydraulic support are determined, thereby ensuring the structural safety of the hydraulic support.

[0146] On the basis of the above embodiments, the embodiments of the present application can also explain and illustrate how to determine the deformation characteristics of the hydraulic support, such as Fig.16 As shown, the method of determining the deformation characteristics of the hydraulic support in the embodiment of the present application includes but is not limited to the following steps:

[0147] S1601, obtaining the excavation time of the simulated excavation using a similar physical model of the stope.

[0148] S1602, based on the column retraction displacement sensor, monitor the displacement change of the hydraulic support, and based on the displacement change and the excavation time, determine the column retraction feature of the hydraulic support as a deformation feature.

[0149] It can be understood that by determining the initial support pressure P of the hydraulic support 1 and safety valve opening pressure P 2 When the force of the hydraulic support reaches the initial hydraulic support pressure P 1 The hydraulic support automatically stops supplying fluid. At this time, the hydraulic support column downward displacement sensor will automatically record the sensor displacement as the initial displacement S of the support under the initial support force application state. 0 .

[0150] As the working face is gradually mined and advanced, when the overlying rock strata are broken and moved, the hydraulic support's oil pressure and column downward retraction displacement sensor will change. The support's oil pressure and column downward retraction displacement sensor's displacement changes are monitored in real time, so that the hydraulic support's oil pressure and excavation time can be determined.

[0151] In some embodiments, the hydraulic support is monitored in real time by using a column downward contraction displacement sensor to obtain the real-time displacement of the hydraulic support, and the displacement change of the hydraulic support can be determined based on the real-time displacement and the initial displacement.

[0152] Optionally, the displacement change of the hydraulic support can be obtained by subtracting the initial displacement from the real-time displacement.

[0153] Furthermore, by correlating the displacement change with the excavation time, the column shrinkage characteristics of the hydraulic support can be obtained.

[0154] Optionally, a curve of displacement change versus excavation time can be plotted to quantitatively characterize the column shrinkage characteristics.

[0155] In the method for identifying the effect of overburden movement on the manifestation of mine pressure in hydraulic supports provided in the embodiment of the present application, the displacement change and excavation time of the hydraulic support are monitored to determine the downward shrinkage feature of the columns of the hydraulic support as a deformation feature, so that the effect of overburden movement on the manifestation of mine pressure in the hydraulic support is identified based on the deformation feature, thereby obtaining a clear and visual manifestation of mine pressure.

[0156] It can be understood that there are three factors affecting the mine pressure manifestation of hydraulic support, namely the stress characteristics of the hydraulic support, the column retraction characteristics and the opening state of the safety valve. Among them, the column retraction characteristics are the factors that best reflect the characteristics of mine pressure manifestation, and the stress characteristics and the opening state of the safety valve are factors that reflect the characteristics of mine pressure manifestation to a certain extent.

[0157] On the basis of the above embodiment, determining the mine pressure manifestation of the hydraulic support further includes determining the stress characteristics of the hydraulic support and the opening state of the safety valve.

[0158] In some embodiments, the support oil pressure and digging time of the hydraulic support are acquired, and the force characteristics of the hydraulic support are determined based on the support oil pressure and digging time, and a fitting relationship.

[0159] In some embodiments, by substituting the support oil pressure and the digging time into the above formula (7), the support oil pressure and the digging time can be fitted to obtain the relationship between the support force and the digging time of the hydraulic support as the force characteristic of the hydraulic support.

[0160] Optionally, a curve of support pressure and excavation time can be plotted to quantitatively characterize the force characteristics.

[0161] Furthermore, the opening state of the safety valve of the hydraulic support can be obtained based on the stress characteristics, and the stress characteristics and the opening state of the safety valve can be used as influencing factors of the mine pressure manifestation of the hydraulic support to determine the mine pressure manifestation of the hydraulic support according to the influencing factors.

[0162] In some embodiments, it can be determined whether the force on the bracket reaches the safety valve opening pressure P according to the force characteristics. 2 , and when the safety valve opening pressure P is reached 2 Make sure the safety valve of the hydraulic support is open.

[0163] In some embodiments, according to the stress characteristics of the hydraulic support and the shrinkage characteristics of the hydraulic support columns during the whole excavation process of the similar model of the mining field, the maximum supporting force P' of the hydraulic support, whether the safety valve is opened, and the maximum shrinkage amount S' of the hydraulic support columns during each excavation step can be counted, and a relationship curve between the excavation step and the three indicators of the maximum supporting force P' of the hydraulic support, whether the safety valve is opened, and the maximum shrinkage amount S' of the hydraulic support columns can be drawn to achieve quantitative characterization of the mineral pressure manifestation of the hydraulic support under the conditions of each excavation step.

[0164] For example, Fig.17 This is a schematic diagram of the quantitative characterization of the deformation characteristics of the hydraulic support. The hydraulic support produced strong mine pressure under the three excavation steps of 155cm, 180cm and 200cm in the working face. The support force of the hydraulic support under the three excavation steps reached the safety valve opening pressure (155N), that is, the safety valve was opened, indicating that the hydraulic support produced strong mine pressure under the overburden migration. The column shrinkage under the three excavation time conditions was 0.35mm, 0.27mm and 1.35mm respectively. The column shrinkage reflects the severity of the mine pressure under the overburden migration, that is, the severity of the mine pressure under the hydraulic support is as follows: excavation to 200cm> excavation to 155cm> excavation to 180cm.

[0165] On the basis of the above embodiment, in order to more fully reflect the deformation of the hydraulic support, the method further includes obtaining the migration characteristics of the rock formation directly above the hydraulic support, and using the migration characteristics as the deformation characteristics of the hydraulic support.

[0166] In some embodiments, a displacement measurement line of the hydraulic support is determined in the rock formation directly above the hydraulic support, wherein the length of the measurement line is the length of the top beam of the hydraulic support, such as Fig.18a The schematic diagram of the displacement measurement line of the hydraulic support is shown in Figure 1. The schematic diagram of the elevation angle measurement of the hydraulic support after excavation is shown in Figure 2. Fig.18b shown.

[0167] For example, taking the top rock layer directly above the hydraulic support as an example, a horizontal displacement measurement line is set at a vertical distance of 1 cm below the top rock layer. When the working face is excavated to 155 cm, 180 cm and 200 cm respectively, the relative vertical displacement curve of the displacement measurement line directly above the hydraulic support along the length direction of the top beam of the hydraulic support is as follows: Fig.19 By analyzing the curve, it can be seen that the relative vertical displacement of the rock layer directly above the top beam of the hydraulic support is the largest when the working face is excavated to 200cm, followed by 155cm, and the smallest when excavated to 180cm, reflecting that the law of the intensity of the movement of the rock layer directly above the top beam of the hydraulic support is: excavation to 200cm> excavation to 155cm> excavation to 180cm.

[0168] In some embodiments, the average vertical displacement, relative vertical displacement and migration inclination of the hydraulic support can be determined based on the displacement measurement line, and the migration characteristics of the rock formation can be determined based on the average vertical displacement, relative vertical displacement and migration inclination, and the migration characteristics can be used as the deformation characteristics of the hydraulic support.

[0169] Optionally, the average vertical displacement, the relative vertical displacement and the migration inclination angle may be used as the migration characteristics of the rock formation, and thus the migration characteristics of the rock formation may be used as the deformation characteristics of the hydraulic support.

[0170] It can be understood that the displacement measurement line measures the displacement of the rock formation. Since it is impossible to directly measure the overall deformation of the hydraulic support, the displacement measurement line is arranged as close to the hydraulic support as possible. Therefore, the movement characteristics of the rock formation can be approximately used to characterize the deformation characteristics of the hydraulic support.

[0171] Optionally, the average vertical displacement can be calculated based on the relative vertical displacement of all measuring points on the displacement measurement line. The calculation formula is as follows:

[0172]

[0173] in, represents the average vertical displacement, D 1 , D 2 …D n Indicates the relative vertical displacement of the measuring points and the number of measuring points.

[0174] When the working face is excavated to 155cm, 180cm and 200cm, the average vertical displacement of the displacement measurement line of the hydraulic support before and after excavation is 1.33mm, 1.00mm and 1.81mm respectively, and the maximum downward contraction of the hydraulic support column is 0.35mm, 0.27mm and 1.35mm respectively. During the rest of the excavation, the maximum downward contraction of the support column and the average vertical displacement of the displacement measurement line before and after excavation are both 0. By drawing the relationship curve between the maximum downward contraction of the hydraulic support column and the average vertical displacement of the displacement measurement line, as shown in the figure Fig. 20 The shrinkage of the hydraulic support column is not linearly proportional to the average vertical displacement of the displacement measurement line, but the average vertical displacement of the displacement measurement line is consistent with the change trend of the shrinkage of the support column, that is, the greater the average vertical displacement, the greater the shrinkage of the support column, and the more severe the hydraulic support mine pressure.

[0175] In some embodiments, the relative vertical displacement of the measuring point can be determined based on the target measuring points at the two end points of the displacement measuring point. The relative vertical displacement of the target measuring point is obtained as the relative vertical displacement of the hydraulic support.

[0176] according to Fig.18aWhen the working face is excavated to 155cm, 180cm and 200cm, the measured relative vertical displacements of the measuring point A above the front end of the hydraulic support and the measuring point B above the rear end before and after excavation are A and B respectively. 1 =0.047mm, A 2 =0.026mm, A 3 =0.40mm, B 1 =2.75mm, B 2 =2.31mm, B 3 =3.67mm, the rule is A 3 >A 1 >A 2 , B 3 >B 1 >B 2 The relative vertical displacement of the two end points of measuring point A and measuring point B on the displacement measuring line is not in linear proportion to the maximum downward shrinkage of the hydraulic support column. Fig.21a and Figure 21b The graph shows the relationship between measuring point A and measuring point B and the maximum downward contraction of the hydraulic support column. However, the evolution trend of the relative vertical displacement of the two end points of measuring point A and measuring point B is consistent with the maximum downward contraction of the support column.

[0177] In some embodiments, the transport inclination angle can be calculated according to the relative vertical displacement of the hydraulic support and the top beam length of the hydraulic support. The transport inclination angle is calculated by determining the vertical displacement difference between the relative vertical displacements corresponding to the target measuring point and according to the vertical displacement difference and the top beam length.

[0178] according to Fig.18b When the working face is excavated to 155cm, 180cm and 200cm, the vertical displacement difference L between measuring point A and measuring point B is obtained by solving the relative vertical displacement of the displacement measuring line directly above the hydraulic support before and after excavation. 2 , hydraulic support top beam length L 1 If it is known, the migration inclination angle α of the hydraulic support can be calculated according to the vertical displacement difference and the top beam length. The calculation formula is as follows: It can be expressed by the following formula:

[0179]

[0180] Based on formula 9, when the working face is excavated to 155 cm, 180 cm and 200 cm, the migration inclination angle α of the hydraulic support is 0.91°, 0.77° and 1.10° respectively. The relationship curve between the migration inclination angle and the maximum downward shrinkage of the support column is as follows: Fig. 22 As shown, the migration inclination angle is not linearly proportional to the maximum downward shrinkage of the support column, but the evolution trend of the migration inclination angle is consistent with the maximum downward shrinkage of the support column.

[0181] The above-mentioned embodiments provide a method for identifying the effect of overburden movement on the mine pressure of a hydraulic support, and an embodiment of the present application further provides a device for identifying the effect of overburden movement on the mine pressure of a hydraulic support. Since the device for identifying the effect of overburden movement on the mine pressure of a hydraulic support provided in the embodiment of the present application corresponds to the method for identifying the effect of overburden movement on the mine pressure of a hydraulic support provided in the above-mentioned embodiments, the implementation method of the above-mentioned method for identifying the effect of overburden movement on the mine pressure of a hydraulic support is also applicable to the device for identifying the effect of overburden movement on the mine pressure of a hydraulic support provided in the embodiment of the present application, and will not be described in detail in the following embodiments.

[0182] In order to implement the above-mentioned embodiment, the present application also proposes a device for identifying the influence of overburden migration on the mine pressure manifestation of hydraulic support.

[0183] Fig.23 A schematic diagram of the structure of a device for identifying the effect of overburden migration on the mine pressure of a hydraulic support provided in an embodiment of the present application.

[0184] like Fig.23 As shown, the identification device 100 for the influence of overburden migration on the mine pressure of hydraulic support includes:

[0185] An acquisition module 110 is used to perform a simulation test based on a preset stope similarity physical model to obtain characteristic images of the stope before and after each excavation time step;

[0186] A first determination module 120 is used to determine the relative displacement field of the stope before and after each excavation time step based on the characteristic image;

[0187] The second determination module 130 is used to determine the deformation characteristics of the hydraulic support before and after each excavation time step based on the similar physical model of the stope, the hydraulic support is installed on the working surface of the stope, and the deformation characteristics at least include the shrinkage characteristics of the columns of the hydraulic support;

[0188] A third determination module 140 is used to determine the relative overburden migration characteristics of the stope based on the relative displacement field;

[0189] The fourth determination module 150 is used to determine the mapping relationship between overburden migration and the mine pressure manifestation of the hydraulic support based on the relative overburden migration characteristics and deformation characteristics, and identify the mine pressure manifestation of the hydraulic support based on the mapping relationship.

[0190] In a possible implementation of an embodiment of the present application, the third determination module 140 is also used to: obtain a binary cloud map corresponding to the relative displacement field; determine the connected area of ​​the target color in the binary cloud map, and use the connected area as the relative overburden migration range; quantitatively characterize the relative overburden migration range, and obtain the relative overburden migration area corresponding to the relative overburden migration range as the relative overburden migration feature.

[0191] In a possible implementation of an embodiment of the present application, the third determination module 140 is further used to: determine a target overburden migration range within a set range directly above the hydraulic support from the relative overburden migration range; quantitatively characterize the target overburden migration range to obtain a target overburden migration area; and use the target overburden migration area as a relative overburden migration feature.

[0192] In a possible implementation of the embodiment of the present application, the fourth determination module 150 is also used to: determine the column shrinkage characteristics of the hydraulic support from the deformation characteristics; determine the linear relationship between the column shrinkage characteristics and the target overburden migration area, and use the linear relationship as a mapping relationship between overburden migration and the mineral pressure manifestation of the hydraulic support.

[0193] In a possible implementation of an embodiment of the present application, the first determination module 120 is also used to: determine, for any excavation time step, a first characteristic image before any excavation time step, and a second characteristic image after any excavation time step; determine a first sub-region plane set and a second sub-region plane set corresponding to the first characteristic image and the second characteristic image, and there is a corresponding relationship between the first sub-region in the first sub-region plane set and the second sub-region in the second sub-region plane set; take any first sub-region in the first sub-region as a reference sub-region, and determine the second sub-region corresponding to the reference sub-region as a target sub-region; and determine the relative displacement field based on the reference sub-region and the target sub-region.

[0194] In a possible implementation of an embodiment of the present application, the first determination module 120 is also used to: determine a reference pixel point from a reference sub-region, and determine a target pixel point corresponding to the reference pixel point from a target sub-region; perform displacement analysis on the reference pixel point and the target pixel point to obtain a displacement value corresponding to the target sub-region; determine a target displacement value corresponding to each target sub-region in the second feature image; and determine a relative displacement field based on the target displacement value.

[0195] In a possible implementation of an embodiment of the present application, the second determination module 130 is also used to: calibrate the support oil pressure of the hydraulic support, and during the calibration process, obtain the support force of the hydraulic support and determine the support oil pressure corresponding to each support force; determine the fitting relationship between the support oil pressure and the support force.

[0196] In a possible implementation of an embodiment of the present application, the second determination module 130 is also used to: obtain the excavation time of a similar physical model of the mining site for simulated excavation; monitor the displacement change of the hydraulic support based on the column retraction displacement sensor, and determine the column retraction feature of the hydraulic support as a deformation feature based on the displacement change and the excavation time.

[0197] In a possible implementation of the embodiment of the present application, the second determination module 130 is also used to: determine the displacement measurement line of the hydraulic support in the rock layer directly above the hydraulic support; based on the displacement measurement line, determine the average vertical displacement, relative vertical displacement and migration inclination of the hydraulic support; based on the average vertical displacement, relative vertical displacement and migration inclination, determine the migration characteristics of the rock layer, and use the migration characteristics as the deformation characteristics of the hydraulic support.

[0198] In a possible implementation of the embodiment of the present application, the device also includes: obtaining the support oil pressure and excavation time of the hydraulic support, and determining the force characteristics of the hydraulic support based on the support oil pressure and excavation time, and the fitting relationship; obtaining the opening state of the safety valve of the hydraulic support based on the force characteristics; using the force characteristics and the opening state of the safety valve as influencing factors of the mine pressure manifestation of the hydraulic support, so as to determine the mine pressure manifestation of the hydraulic support according to the influencing factors.

[0199] In the identification device for the influence of overburden migration on the manifestation of hydraulic support pressure provided in the embodiment of the present application, the experiment is conducted by using a similar physical model of the mining field, and the characteristic images before and after the excavation process are obtained, so as to determine the relative displacement field of the excavation time step according to the characteristic images. By determining the deformation characteristics of the hydraulic support during the excavation process, and obtaining the relative overburden migration characteristics from the relative displacement field, a mapping relationship between overburden migration and the manifestation of hydraulic support pressure is established according to the relative overburden migration characteristics and the deformation characteristics, so that the manifestation of hydraulic support pressure can be identified according to the mapping relationship. According to the mapping relationship, the overburden migration law that affects the manifestation of hydraulic support pressure can be clarified, and the method support is provided for the essential analysis of the overburden migration law and the manifestation of hydraulic support pressure in similar simulation experiments, so as to provide a basis for preventing and controlling the hydraulic support pressure accident in the underground during coal mining, and greatly reduce the initial investment cost of coal mining.

[0200] It should be noted that the above explanation of the embodiment of the method for identifying the influence of overburden migration on the manifestation of mine pressure of hydraulic support is also applicable to the device for identifying the influence of overburden migration on the manifestation of mine pressure of hydraulic support in this embodiment, and will not be repeated here.

[0201] The collection, storage, use, processing, transmission, provision and application of user personal information involved in this application are in compliance with relevant laws and regulations and do not violate public order and good morals.

[0202] It should be noted that personal information from users should be collected for legitimate and reasonable purposes and should not be shared or sold outside of these legitimate uses. In addition, such collection / sharing should be carried out after receiving the user's informed consent, including but not limited to notifying the user to read the user agreement / user notice and sign the agreement / authorization including authorization of relevant user information before the user uses the function. In addition, any necessary steps should be taken to protect and safeguard access to such personal information data and ensure that others who have access to personal information data comply with its privacy policy and procedures.

[0203] This application is expected to provide an implementation scheme for users to selectively block the use or access of personal information data. That is, this application is expected to provide hardware and / or software to prevent or block access to such personal information data. Once the personal information data is no longer needed, risks can be minimized by limiting data collection and deleting data. In addition, when applicable, personal identifiers are removed from such personal information to protect the privacy of users.

[0204] In the description of the aforementioned embodiments, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0205] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0206] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0207] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute the instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0208] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or a combination thereof: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0209] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0210] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0211] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for identifying the influence of overburden migration on the mine pressure of hydraulic support, characterized in that: The method comprises: A simulation test is carried out based on a preset similar physical model of the stope to obtain the characteristic images of the stope before and after each excavation time step; Based on the characteristic image, determining the relative displacement field of the stope before and after each excavation time step; Determining deformation characteristics of a hydraulic support before and after each excavation time step based on a similar physical model of the stope, wherein the hydraulic support is installed on a working surface of the stope, and the deformation characteristics at least include a shrinkage characteristic of a column of the hydraulic support; Determining relative overburden migration characteristics of the stope based on the relative displacement field; Based on the relative overburden migration characteristics and the deformation characteristics, a mapping relationship between overburden migration and the mine pressure manifestation of the hydraulic support is determined, and the mine pressure manifestation of the hydraulic support is identified based on the mapping relationship.

2. The method according to claim 1, characterized in that Determining the relative overburden migration characteristics of the stope based on the relative displacement field includes: Obtaining a binary cloud image corresponding to the relative displacement field; Determine a connected area of ​​the target color in the binary cloud image, and use the connected area as a relative overburden migration range; The relative overburden migration range is quantitatively characterized to obtain a relative overburden migration area corresponding to the relative overburden migration range as the relative overburden migration feature.

3. The method according to claim 2, characterized in that The quantitative characterization of the relative overburden migration range to obtain the relative overburden migration area corresponding to the relative overburden migration range as the relative overburden migration feature includes: Determine a target overburden migration range within a set range directly above the hydraulic support from the relative overburden migration range; Quantitatively characterize the migration range of the target overburden rock to obtain the target overburden rock migration area; The target overburden migration area is used as the relative overburden migration feature.

4. The method according to claim 3, characterized in that The determining of the mapping relationship between overburden migration and the mine pressure manifestation of the hydraulic support based on the relative overburden migration characteristics and the deformation characteristics includes: Determining the column shrinkage feature of the hydraulic support from the deformation feature; A linear relationship between the column shrinkage feature and the target overburden migration area is determined, and the linear relationship is used as a mapping relationship between the overburden migration and the mine pressure manifestation of the hydraulic support.

5. The method according to claim 1, characterized in that Determining the relative displacement field of the stope before and after each excavation time step based on the characteristic image comprises: For any excavation time step, determining a first characteristic image before any excavation time step and a second characteristic image after any excavation time step; Determine a first sub-region plane set and a second sub-region plane set corresponding to the first feature image and the second feature image, wherein a first sub-region in the first sub-region plane set and a second sub-region in the second sub-region plane set have a corresponding relationship; Taking any first sub-region among the first sub-regions as a reference sub-region, and determining a second sub-region corresponding to the reference sub-region as a target sub-region; Based on the reference sub-region and the target sub-region, the relative displacement field is determined.

6. The method according to claim 5, characterized in that The determining the relative displacement field based on the reference sub-region and the target sub-region comprises: Determine a reference pixel point from the reference sub-region, and determine a target pixel point corresponding to the reference pixel point from the target sub-region; Performing displacement analysis on the reference pixel point and the target pixel point to obtain a displacement value corresponding to the target sub-region; Determining a target displacement value corresponding to each target sub-region in the second feature image; Based on the target displacement value, the relative displacement field is determined.

7. The method according to claim 1, characterized in that Before determining the deformation characteristics of the hydraulic support before and after each excavation time step, the method further includes: The support oil pressure of the hydraulic support is checked. During the checking process, the support force of the hydraulic support is obtained, and the support oil pressure corresponding to each support force is determined; Determine the fitting relationship between the bracket oil pressure and the bracket force.

8. The method according to claim 1, characterized in that The step of determining the deformation characteristics of the hydraulic support before and after each excavation time step based on the similar physical model of the stope includes: Obtaining the excavation time of the similar physical model of the stope for simulated excavation; Based on the column retraction displacement sensor, the displacement change of the hydraulic support is monitored, and based on the displacement change and the excavation time, the column retraction feature of the hydraulic support is determined as the deformation feature.

9. The method according to claim 8, characterized in that The step of determining the deformation characteristics of the hydraulic support before and after each excavation time step also includes: Determining a displacement measurement line of the hydraulic support in a rock layer directly above the hydraulic support; Based on the displacement measurement line, determine the average vertical displacement, relative vertical displacement and migration inclination of the hydraulic support; Based on the average vertical displacement, the relative vertical displacement and the migration inclination, the migration characteristics of the rock formation are determined, and the migration characteristics are used as the deformation characteristics of the hydraulic support.

10. The method according to claim 7, characterized in that The method further comprises: Acquiring the support oil pressure and digging time of the hydraulic support, and determining the force characteristics of the hydraulic support based on the support oil pressure and digging time, and the fitting relationship; Based on the force characteristics, the opening state of the safety valve of the hydraulic support is obtained; The force characteristics and the opening state of the safety valve are used as influencing factors of the mine pressure manifestation of the hydraulic support, so as to determine the mine pressure manifestation of the hydraulic support according to the influencing factors.

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