Method and device for determining rock fall angle

Abstract

The application provides a rock stratum collapse angle determination method and device, wherein the method comprises the following steps: determining a fracture point of a roof rock stratum of a coal mining face during the advancing of the coal mining face, obtaining spatial position information of the fracture point and a fracture time of the roof rock stratum, determining a vertical height of the fracture point from the coal mining face and horizontal displacement data of the position of the fracture point lagging behind the coal mining face, and determining a collapse angle of the roof rock stratum based on the vertical height and the horizontal displacement data. The rock stratum collapse angle determination method and device provided by the application determine the vertical height of the fracture point from the coal mining face and the horizontal displacement data of the position of the fracture point lagging behind the coal mining face through the spatial position information of the fracture point and the fracture time, and calculate and inversely obtain the collapse angle of the roof rock stratum, so that the collapse angle of the roof rock stratum during the advancing of the coal mining face is measured without affecting the coal mining operation.

Description

Technical Field

[0001] This invention relates to the field of coal mining technology, and in particular to a method and apparatus for determining the collapse angle of rock strata. Background Technology

[0002] The caving angle is an important indicator for evaluating the strength and integrity of the coal seam roof. After coal seam mining, the overlying roof strata gradually collapse due to the loss of support, forming a caving slope with a certain angle in the vertical direction. The angle between this slope and the horizontal plane is the caving angle of the roof strata. The size of the caving angle is affected by various factors, but generally depends mainly on the strength of the rock mass. High rock mass strength and good integrity result in a small caving angle, and vice versa.

[0003] Accurately determining the collapse angle of the roof strata is crucial for managing mining pressure at the working face. When a roof fracture collapses, the size of the collapse angle affects the pushing and impact force of the collapsing rock blocks on the stope supports. A smaller collapse angle causes the fractured rock blocks to move along the fracture surface towards the roof control area, easily pushing or destroying the working face supports and causing a roof collapse accident. A larger collapse angle reduces the pushing and impact force of the roof collapse on the cutting support.

[0004] Existing studies on the collapse angle of roof strata generally employ indirect methods such as numerical calculations and similarity models, which cannot achieve the actual measurement of the collapse angle of strata during coal mining. The need to achieve the actual measurement of the collapse angle of strata is a crucial issue that the industry urgently needs to address. Summary of the Invention

[0005] This invention provides a method and apparatus for determining the collapse angle of rock strata, which solves the problem of measuring the collapse angle of rock strata in the coal mining process in the prior art.

[0006] This invention provides a method for determining the collapse angle of rock strata, comprising:

[0007] During the advance of the coal mining face, the fracture point of the roof rock strata of the coal mining face is determined, and the spatial location information of the fracture point and the fracture time of the roof rock strata are obtained.

[0008] Based on the spatial location information, the vertical height of the fracture point from the coal mining face is determined;

[0009] Based on the fracture time and the spatial location information, the location of the fracture point is determined to lag behind the horizontal displacement data of the coal mining face.

[0010] Based on the vertical height of the fracture point from the coal mining face and the horizontal displacement data, the collapse angle of the roof strata is determined.

[0011] According to a method for determining the collapse angle of rock strata provided by the present invention, during the advancement of a coal mining face, the method for determining the fracture point where the roof strata of the coal mining face fractures includes:

[0012] Based on multiple displacement gauges distributed in the borehole, the displacement changes at various positions in the borehole are monitored. The borehole is a construction connecting roadway between the main haulage roadway and the auxiliary haulage roadway, and is drilled at a preset angle along the coal seam of the coal mining face towards the roof strata. The multiple displacement gauges are used to monitor the displacement changes at different spatial positions in the borehole.

[0013] During the advance of the coal mining face, the fracture point of the roof rock strata is determined based on the displacement change of the borehole corresponding to the fracture location of the roof rock strata.

[0014] According to the method for determining the collapse angle of rock strata provided by the present invention, the borehole satisfies a first preset condition and a second preset condition;

[0015] The first preset condition is:

[0016]

[0017] Wherein, L1 is the length of the borehole, L0 is the length of the coal mining face, and β is the direction angle in the preset angle of the borehole, which is the angle between the borehole construction direction and the coal mining face advancement direction;

[0018] The second preset condition is:

[0019]

[0020] Wherein, Δh0 is the vertical distance from the roof strata to the coal face, and θ is the inclination angle in the preset angle of the borehole.

[0021] According to a method for determining the collapse angle of a rock stratum provided by the present invention, the spatial location information of the fracture point and the fracture time of the top rock stratum are obtained, including:

[0022] Based on the spatial trajectory coordinates of the borehole, the spatial coordinates of the displacement gauge in the borehole corresponding to the location of the fracture point are determined, and the spatial location information of the fracture point is determined based on the spatial coordinates of the displacement gauge.

[0023] Based on the displacement gauge in the borehole corresponding to the fracture point, the time of change of displacement of the top rock layer after the collapse is monitored, and the change time is taken as the fracture time.

[0024] According to a method for determining the collapse angle of a rock stratum provided by the present invention, based on the fracture time and the spatial location information, the method determines that the location of the fracture point lags behind the horizontal displacement data of the coal mining face, including:

[0025] Based on the fracture time, determine the first distance between the coal mining face and the stop line when the roof strata fracture.

[0026] Based on the spatial location information and the location information of the initial drilling point of the borehole, the horizontal distance between the initial drilling point and the fracture point is determined.

[0027] Based on the first distance, the horizontal distance from the initial borehole point to the fracture point, and the horizontal distance from the initial borehole point to the stop-mining line, the position of the fracture point is determined to lag behind the horizontal displacement data of the coal mining face.

[0028] According to the method for determining the collapse angle of rock strata provided by the present invention, the collapse angle of the top rock strata is:

[0029]

[0030] Wherein, α is the collapse angle of the roof strata, Δh1 is the vertical height of the fracture point from the coal mining face, and Δl1 is the horizontal displacement data.

[0031] The present invention also provides a device for determining the caving angle of rock strata, comprising:

[0032] The fracture point determination module is used to determine the fracture point of the roof strata of the coal mining face during the advancement of the coal mining face, and to obtain the spatial location information of the fracture point and the fracture time of the roof strata.

[0033] A vertical height determination module is used to determine the vertical height of the fracture point from the coal mining face based on the spatial location information.

[0034] The horizontal displacement determination module is used to determine the position of the fracture point lagging behind the horizontal displacement data of the coal mining face based on the fracture time and the spatial location information.

[0035] The collapse angle determination module is used to determine the collapse angle of the roof strata based on the vertical height of the fracture point from the coal mining face and the horizontal displacement data.

[0036] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the method for determining the collapse angle of the rock strata as described above.

[0037] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the method for determining the collapse angle of rock strata as described above.

[0038] The present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the method for determining the collapse angle of rock strata as described above.

[0039] The method and apparatus for determining the collapse angle of a rock stratum provided by this invention determine the spatial location information of the fracture point of the roof stratum and the fracture time of the roof stratum during the advancement of the coal mining face. Based on the spatial location information and fracture time of the fracture point, the vertical height of the fracture point from the coal mining face and the horizontal displacement data of the fracture point lagging behind the coal mining face are determined, and the collapse angle of the roof stratum is calculated and inverted. This method achieves the actual measurement of the collapse angle of the roof stratum during the advancement of the coal mining face without affecting the coal mining operation. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in this invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly described below. Obviously, the accompanying drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a flowchart illustrating the method for determining the collapse angle of rock strata provided by the present invention;

[0042] Figure 2 This is a schematic diagram of the structure for forming a collapse angle provided by the present invention;

[0043] Figure 3 This is a schematic diagram of the horizontal displacement data provided by the present invention;

[0044] Figure 4 This is a flowchart illustrating the method for determining the collapse angle of rock strata provided by the present invention.

[0045] Figure 5 This is a schematic diagram of the structure of the device for determining the rock strata collapse angle provided by the present invention;

[0046] Figure 6 This is a schematic diagram of the structure of the electronic device provided by the present invention.

[0047] Figure label:

[0048] 101: Borehole; 102: Fault point; 103: Roof strata; 104: Coal mining face;

[0049] 105: Construction connecting roadway between the main transport roadway and the auxiliary transport roadway; 106: Coal seam; 107: Collapse line. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0051] Figure 1 This is a flowchart illustrating the method for determining the collapse angle of rock strata provided by the present invention. (Refer to...) Figure 1 The method for determining the collapse angle of rock strata provided by the present invention may include:

[0052] Step 110: During the advance of the coal mining face, determine the fracture point of the roof rock strata of the coal mining face, and obtain the spatial location information of the fracture point and the fracture time of the roof rock strata.

[0053] Step 120: Based on the spatial location information, determine the vertical height of the fracture point from the coal mining face;

[0054] Step 130: Based on the fracture time and the spatial location information, determine that the location of the fracture point lags behind the horizontal displacement data of the coal mining face.

[0055] Step 140: Determine the collapse angle of the roof strata based on the vertical height of the fracture point from the coal mining face and the horizontal displacement data.

[0056] The execution subject of the method for determining the collapse angle of rock strata provided by this invention can be an electronic device, a component in an electronic device, an integrated circuit, or a chip. The electronic device can be a mobile electronic device or a non-mobile electronic device. For example, a mobile electronic device can be a mobile phone, tablet computer, laptop computer, PDA, ultra-mobile personal computer (UMPC), netbook, or personal digital assistant (PDA), etc., while a non-mobile electronic device can be a server, network attached storage (NAS), or personal computer (PC), etc. This invention does not impose specific limitations.

[0057] The following example, using a computer to execute the method for determining the rock strata collapse angle provided by this invention, illustrates the technical solution of this invention in detail.

[0058] In step 110, during the coal mining process, the fracture point of the roof strata in the coal mining face is determined. The spatial location information of the fracture point and the fracture time of the roof strata are obtained.

[0059] A coal mining face is the specific area in a coal mine where coal is mined; it is also known as a "working platform" or "coal face." It is the core part of coal mine production, where coal is transported from underground to the surface.

[0060] Coal mining faces are typically located in the horizontal or inclined portions of coal seams. At the working face, miners use tools and equipment such as coal mining machines, support structures, and transport equipment to cut, extract, and transport coal. The entire process includes cutting coal, loading coal, supporting the rock strata to prevent roof collapse, clearing the working face, laying support structures, and arranging the transport system.

[0061] The roof strata refer to the rock layers (or caprock) located above the coal seam during coal mining. They are also known as roof rock or roof coal. The roof strata are an important component of the coal face and its surrounding area, directly affecting the safety and efficiency of coal production.

[0062] During the advancement of coal mining faces, due to the formation of goaf and the existence of weak coal seam zones, the roof strata are subjected to severe deformation and stress, which may cause them to break, resulting in the collapse and downward movement of part or all of the overlying roof strata.

[0063] The overlying strata will gradually collapse, forming a collapse slope at a certain angle in the vertical direction. The angle between this slope and the horizontal plane is the collapse angle of the overlying strata.

[0064] During the coal mining process, the fracture point of the roof strata is determined. After determining the fracture point, the spatial location information of the fracture point and the fracture time of the roof strata are further obtained. The spatial location information of the fracture point can be its three-dimensional coordinates.

[0065] In step 120, the vertical height of the fracture point from the coal mining face is determined based on the spatial location information of the fracture point.

[0066] It is understandable that after determining the spatial location information of the break point, for example, determining the three-dimensional spatial coordinates of the break point as (x... p y p , z p Based on z p This allows us to determine the vertical height of the fracture point from the coal mining face.

[0067] In step 130, based on the fracture time of the roof strata and the spatial location information of the fracture point, the location of the fracture point is determined to lag behind the horizontal displacement data of the coal mining face.

[0068] The fracture time refers to the time it takes for the roof strata to fracture. It's understood that the coal face advances at a certain speed. Based on the fracture time, the advancing distance of the coal face can be determined.

[0069] Based on the advancing distance of the coal mining face and the spatial location information of the fracture point, the location of the fracture point can be determined to lag behind the horizontal displacement data of the coal mining face.

[0070] In step 140, after determining the vertical height of the fracture point from the coal mining face and the horizontal displacement data of the fracture point lagging behind the coal mining face, the collapse angle of the roof strata is determined based on the vertical height of the fracture point from the coal mining face and the horizontal displacement data of the fracture point lagging behind the coal mining face.

[0071] It is understandable that as the coal seam is gradually mined, the overlying roof strata will gradually collapse due to the loss of support, forming a collapse slope at a certain angle in the vertical direction. The angle between this slope and the horizontal plane is the collapse angle of the roof strata.

[0072] After determining the specific dimensions of the two right-angled sides of the inclined plane, the angle between the inclined plane and the horizontal plane can be calculated. The two right-angled sides represent the vertical height of the fracture point from the coal face and the horizontal displacement data of the fracture point lagging behind the coal face.

[0073] Therefore, the collapse angle of the roof strata can be calculated based on the vertical height of the fracture point from the coal mining face and the horizontal displacement data of the fracture point lagging behind the coal mining face.

[0074] Optionally, the resulting collapse angle can be as follows: Figure 2 The structural schematic diagram of the formation of the collapse angle provided by the present invention is shown.

[0075] Using downhole directional drilling, a borehole 101 was drilled in the construction connecting roadway 105 between the main haulage roadway and the auxiliary haulage roadway, along the coal seam 106 of the coal face 104 towards the roof strata 103. The spatial coordinates W(x) of the three-dimensional trajectory of the borehole 101 were recorded. i y i , z i ).

[0076] Among them, the length of borehole 101 is L1, and the requirements for the azimuth angle β and dip angle θ of borehole 101 include: (1) the horizontal projection distance of borehole 101 is greater than 1 / 2 of the length L0 of the coal mining face 104. Right now (2) The vertical projection height of borehole 101 is greater than the basic roof vertical height Δh0 of the caving zone of coal face 104, that is...

[0077] Multiple high-precision displacement gauges were installed inside borehole 101 to continuously monitor and record displacement changes at different spatial locations within borehole 101. During the advancement of the coal face 104, the roof strata 103 partially fractured and collapsed along the caving line 107. Using the high-precision displacement gauges, the spatial location W(x) of the fracture point 102 of the roof strata 103 was monitored and captured. p y p , z p and fracture time T p .

[0078] When calculating the fracture and collapse of the roof stratum 103, the position of the fracture point 102 lags behind the horizontal displacement data Δl1 of the coal face 104.

[0079] The specific determination process of Δl1 is as follows: (1) Based on the fracture time T of the top stratum 103 p When the roof stratum 103 fractures, the distance ΔL4 between the coal face 104 and the stop line is obtained; (2) the spatial location W(x) of the fracture point 102 is determined by combining the construction trajectory of borehole 101. p y p , z p (3) The horizontal displacement data Δl1=ΔL3+ΔL2-ΔL4 of the coal mining face 104 is calculated to obtain the position of the fracture point 102 and the position of the borehole opening.

[0080] The collapse angle α can be specifically determined by Figure 2The enlarged view on the right shows the spatial coordinates W(x) of the fracture point 102 determined based on the trajectory of borehole 101. p y p , z p Calculate the vertical height Δh1 of the fracture point 101 from the coal face 104. The calculation formula is: Δh1 = z p -h2, where z p h1 represents the vertical height of the spatial coordinates of fracture point 102, and h2 represents the thickness of coal seam 106.

[0081] Based on the obtained position of fracture point 102 lagging behind the horizontal displacement data Δl1 of the coal mining face 104 and the vertical height Δh1 of fracture point 101 from the coal mining face 104, the collapse angle α of the roof stratum 102 is calculated.

[0082] The obtained collapse angle α is:

[0083]

[0084] Understandably, the process of determining the collapse angle can not only be measured during coal mining, but also has high repeatability and can be determined multiple times.

[0085] The method for determining the collapse angle of the roof strata provided in this invention determines the spatial location information of the fracture point of the roof strata during the advance of the coal mining face, as well as the fracture time of the roof strata. Based on the spatial location information and fracture time of the fracture point, the vertical height of the fracture point from the coal mining face and the horizontal displacement data of the fracture point lagging behind the coal mining face are determined, and the collapse angle of the roof strata is calculated and inverted. This method achieves the actual measurement of the collapse angle of the roof strata during the advance of the coal mining face without affecting coal mining operations.

[0086] In one embodiment, determining the fracture point of the roof strata during the advancement of the coal mining face includes: monitoring displacement changes at various locations within a borehole using multiple displacement gauges distributed in the borehole, wherein the borehole is a construction connecting roadway between the main haulage roadway and the auxiliary haulage roadway, drilled at a preset angle along the coal seam of the coal mining face towards the roof strata; the multiple displacement gauges are used to monitor displacement changes at different spatial locations within the borehole; and determining the fracture point of the roof strata based on the displacement changes of the borehole corresponding to the fracture location during the advancement of the coal mining face.

[0087] In the construction connecting roadway between the main haulage roadway and the auxiliary haulage roadway, boreholes are drilled at a predetermined angle along the coal seam towards the roof strata of the mining face, and multiple displacement gauges are installed in the boreholes. These displacement gauges are used to monitor displacement changes at different spatial locations within the boreholes.

[0088] Optionally, the density of displacement gauge deployment can be determined based on the length of the borehole. Based on the deployment density, multiple displacement gauges are uniformly deployed within the borehole.

[0089] During the advancement of the coal mining face, the roof strata fracture and collapse. The borehole penetrates the roof strata at a predetermined angle. After the roof strata fracture and collapse, the displacement of the collapsed portion changes. Displacement gauges installed in the boreholes in the collapsed portion of the roof strata can monitor these changes in displacement.

[0090] By determining the specific coordinates of the displacement gauges corresponding to the locations where displacement changes from multiple displacement gauges, the fracture point where the top rock strata fracture can be identified.

[0091] Optionally, since the positions of multiple displacement gauges are determined during deployment, and the displacement gauges in the collapsed section of the roof strata will monitor displacement changes while those in the uncollapsed sections will not, the specific location of the fracture point can be determined based on the displacement gauges drilled in the collapsed section of the roof strata and the displacement gauges in the uncollapsed sections.

[0092] Understandably, the borehole displacement gauge-based method is reliable in its monitoring principle, simple in its construction, has minimal interference with production, and high repeatability in the monitoring process. It can provide valuable technical support for evaluating the stability of the roof strata in coal mining and for managing mine pressure in coal mining faces.

[0093] The method for determining the collapse angle of rock strata provided in this invention involves deploying multiple displacement gauges in the borehole to monitor the displacement changes of the borehole corresponding to the fracture location of the roof rock strata, thereby determining the fracture point of the roof rock strata and achieving accurate determination of the fracture point.

[0094] In one embodiment, the drilling satisfies a first preset condition and a second preset condition;

[0095] The first preset condition is:

[0096]

[0097] Wherein, L1 is the length of the borehole, L0 is the length of the coal mining face, and β is the direction angle in the preset angle of the borehole, which is the angle between the borehole construction direction and the coal mining face advancement direction;

[0098] The second preset condition is:

[0099]

[0100] Wherein, Δh0 is the vertical distance from the roof strata to the coal face, and θ is the inclination angle in the preset angle of the borehole.

[0101] Among them, the length of borehole 101 is L1, and the requirements for the orientation angle β and dip angle θ of borehole 101 include: (1) the horizontal projection distance of borehole 101 is greater than 1 / 2 of the length L0 of the coal mining face 104. Right now (2) The vertical projection height of borehole 101 is greater than the basic roof vertical height Δh0 of the caving zone of coal face 104, that is...

[0102] Understandably, once the conditions for drilling are met, it is possible to ensure that when the roof strata collapse, the collapsed portion of the roof strata includes the borehole, allowing the displacement gauge in the borehole to monitor the displacement changes of the collapsed portion of the roof strata.

[0103] The method for determining the rock strata collapse angle provided in this embodiment of the invention determines the borehole by determining that the borehole meets a first preset condition and a second preset condition.

[0104] In one embodiment, obtaining the spatial location information of the fracture point and the fracture time of the top rock stratum includes: determining the spatial coordinates of the displacement gauge in the borehole corresponding to the location of the fracture point based on the spatial trajectory coordinates of the borehole, and determining the spatial location information of the fracture point based on the spatial coordinates of the displacement gauge; monitoring the change time of the displacement of the top rock stratum after the collapse based on the displacement gauge in the borehole corresponding to the location of the fracture point, and using the change time as the fracture time.

[0105] The holes are pre-drilled and the spatial trajectory coordinates of the holes can be determined during the drilling process.

[0106] Based on the spatial trajectory coordinates of the borehole, the spatial coordinates of the displacement gauge in the borehole corresponding to the location of the fracture point in the roof strata are determined. It is understandable that when the roof strata are penetrated by the borehole and a portion of the roof strata fractures, the fractured portion collapses. The displacement gauge installed in the borehole within the fractured portion of the roof strata will monitor the change in displacement, thus allowing the determination of the spatial coordinates of the displacement gauge in the borehole corresponding to the fracture point.

[0107] After determining the spatial coordinates of the displacement gauge in the borehole corresponding to the location of the fracture point, the spatial location information of the fracture point is determined based on the determined spatial coordinates of the displacement gauge.

[0108] The displacement gauge can also record the time when the displacement changes. Therefore, based on the displacement gauge in the borehole corresponding to the fracture point, the time when the displacement of the top rock layer changes after the collapse can be monitored, and the time of change can be used as the fracture time.

[0109] The method for determining the collapse angle of rock strata provided in this embodiment of the invention determines the spatial coordinates of the displacement gauge in the borehole corresponding to the location of the fracture point of the top rock strata based on the spatial trajectory coordinates of the borehole, and monitors the change time of the displacement of the top rock strata after collapse based on the displacement gauge in the borehole corresponding to the location of the fracture point, thereby realizing the determination of the spatial location information of the fracture point and the fracture time.

[0110] In one embodiment, determining the position of the fracture point lagging behind the horizontal displacement data of the coal mining face based on the fracture time and the spatial location information includes: determining a first distance from the coal mining face to the stop line when the roof strata fracture, based on the fracture time; determining a horizontal distance from the initial borehole point to the fracture point based on the spatial location information and the location information of the initial borehole point; and determining the horizontal displacement data of the fracture point lagging behind the coal mining face based on the first distance, the horizontal distance from the initial borehole point to the fracture point, and the horizontal distance from the initial borehole point to the stop line.

[0111] Specifically, a schematic diagram showing the location of the fracture point lagging behind the horizontal displacement data of the coal face is shown below. Figure 3 The schematic diagram of horizontal displacement data provided by this invention is shown.

[0112] When calculating the fracture and collapse of the roof strata, the location of fracture point 102 lags behind the horizontal displacement data Δl1 of the coal face 104.

[0113] The specific determination process of Δl1 is as follows: (1) Based on the fracture time T of the top strata p (2) Determine the spatial location information W(x) of the fracture point 102 by combining the construction trajectory of borehole 101. p y p , z p ), and then obtain the horizontal distance ΔL2 between the fracture point 102 and the initial borehole point (borehole opening). (3) Calculate the horizontal displacement data Δl1=ΔL3+ΔL2-ΔL4 of the coal mining face 104, where ΔL3 is the horizontal distance between the initial borehole point of borehole 101 and the stop mining line.

[0114] The method for determining the collapse angle of rock strata provided in this embodiment of the invention determines the location of the fracture point by using fracture time and spatial location information, which lags behind the horizontal displacement data of the coal mining face, thus providing a basis for subsequent calculation of the collapse angle.

[0115] In one embodiment, the collapse angle of the top strata is:

[0116]

[0117] Wherein, α is the collapse angle of the roof strata, Δh1 is the vertical height of the fracture point from the coal mining face, and Δl1 is the horizontal displacement data.

[0118] After determining the vertical height of the fracture point from the coal face and the horizontal displacement data of the fracture point lagging behind the coal face, the collapse angle can be determined by substituting these data into the calculation formula.

[0119] The method for determining the collapse angle of the roof strata provided in this embodiment of the invention determines the vertical height of the fracture point from the coal mining face and the horizontal displacement data of the fracture point lagging behind the coal mining face, and calculates and inverts the collapse angle of the roof strata, thus realizing the actual measurement of the collapse angle.

[0120] The following is a flowchart illustrating a method for determining the collapse angle of rock strata provided by this invention. Figure 4 For example, the technical solution provided by this invention will be explained:

[0121] In step 410, a directional borehole is drilled, and multiple high-precision displacement gauges are deployed within it. Downhole directional drilling is employed, and a borehole is drilled along the coal seam towards the roof strata in the construction connecting roadway between the main and auxiliary haulage roadways. The three-dimensional spatial trajectory coordinates of the borehole are recorded. Multiple high-precision displacement gauges are installed within the borehole to continuously monitor and record displacement changes at different spatial locations within the borehole over time.

[0122] In step 420, the displacement data of the high-precision displacement gauge and the fracture time of the roof strata are directly monitored. The fracture point of the roof strata in the coal mining face is determined, and the spatial location information of the fracture point and the fracture time of the roof strata are obtained.

[0123] In step 430, the monitored data is analyzed and processed to determine the vertical height of the fracture point from the coal face and the horizontal displacement data of the fracture point lagging behind the coal face. Based on the spatial location information of the fracture point, the vertical height of the fracture point from the coal face is determined; based on the fracture time of the roof strata fracture and the spatial location information of the fracture point, the horizontal displacement data of the fracture point lagging behind the coal face is determined.

[0124] In step 440, based on the vertical height of the fracture point from the coal mining face obtained after data analysis and processing, and the horizontal displacement data of the fracture point lagging behind the coal mining face, the collapse angle of the roof strata is determined.

[0125] Figure 5 A schematic diagram of the structure of the device for determining the rock strata collapse angle provided by the present invention is shown below. Figure 5 As shown, the device includes:

[0126] The fracture point determination module 510 is used to determine the fracture point of the roof rock layer of the coal mining face during the advance of the coal mining face, and to obtain the spatial location information of the fracture point and the fracture time of the roof rock layer.

[0127] The vertical height determination module 520 is used to determine the vertical height of the fracture point from the coal mining face based on the spatial location information.

[0128] The horizontal displacement determination module 530 is used to determine the position of the fracture point lagging behind the horizontal displacement data of the coal mining face based on the fracture time and the spatial location information.

[0129] The collapse angle determination module 540 is used to determine the collapse angle of the roof strata based on the vertical height of the fracture point from the coal mining face and the horizontal displacement data.

[0130] The device for determining the collapse angle of the roof strata provided in this invention determines the spatial location information of the fracture point of the roof strata and the fracture time of the roof strata during the advancement of the coal mining face. Based on the spatial location information and fracture time of the fracture point, the vertical height of the fracture point from the coal mining face and the horizontal displacement data of the fracture point lagging behind the coal mining face are determined, and the collapse angle of the roof strata is calculated and inverted. This device achieves the actual measurement of the collapse angle of the roof strata during the advancement of the coal mining face without affecting the coal mining operation.

[0131] In one embodiment, the breakpoint determination module 510 is specifically used for:

[0132] During the advancement of the coal mining face, the fracture points where the roof strata of the coal mining face fracture are determined, including:

[0133] Based on multiple displacement gauges distributed in the borehole, the displacement changes at various positions in the borehole are monitored. The borehole is a construction connecting roadway between the main haulage roadway and the auxiliary haulage roadway, and is drilled at a preset angle along the coal seam of the coal mining face towards the roof strata. The multiple displacement gauges are used to monitor the displacement changes at different spatial positions in the borehole.

[0134] During the advance of the coal mining face, the fracture point of the roof rock strata is determined based on the displacement change of the borehole corresponding to the fracture location of the roof rock strata.

[0135] In one embodiment, the breakpoint determination module 510 is further configured to:

[0136] The drilling meets both the first and second preset conditions;

[0137] The first preset condition is:

[0138]

[0139] Wherein, L1 is the length of the borehole, L0 is the length of the coal mining face, and β is the direction angle in the preset angle of the borehole, which is the angle between the borehole construction direction and the coal mining face advancement direction;

[0140] The second preset condition is:

[0141]

[0142] Wherein, Δh0 is the vertical distance from the roof strata to the coal face, and θ is the inclination angle in the preset angle of the borehole.

[0143] In one embodiment, the breakpoint determination module 510 is further configured to:

[0144] Obtaining the spatial location information of the fracture point and the fracture time of the top rock strata includes:

[0145] Based on the spatial trajectory coordinates of the borehole, the spatial coordinates of the displacement gauge in the borehole corresponding to the location of the fracture point are determined, and the spatial location information of the fracture point is determined based on the spatial coordinates of the displacement gauge.

[0146] Based on the displacement gauge in the borehole corresponding to the fracture point, the time of change of displacement of the top rock layer after the collapse is monitored, and the change time is taken as the fracture time.

[0147] In one embodiment, the horizontal displacement determination module 530 is specifically used for:

[0148] Based on the fracture time and spatial location information, determining the location of the fracture point lags behind the horizontal displacement data of the coal mining face, including:

[0149] Based on the fracture time, determine the first distance between the coal mining face and the stop line when the roof strata fracture.

[0150] Based on the spatial location information and the location information of the initial drilling point of the borehole, the horizontal distance between the initial drilling point and the fracture point is determined.

[0151] Based on the first distance, the horizontal distance from the initial borehole point to the fracture point, and the horizontal distance from the initial borehole point to the stop-mining line, the position of the fracture point is determined to lag behind the horizontal displacement data of the coal mining face.

[0152] In one embodiment, the collapse angle determination module 540 is specifically used for:

[0153] The collapse angle of the top strata is:

[0154]

[0155] Wherein, α is the collapse angle of the roof strata, Δh1 is the vertical height of the fracture point from the coal mining face, and Δl1 is the horizontal displacement data.

[0156] Figure 6 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 6 As shown, the electronic device may include: a processor 610, a communication interface 620, a memory 630, and a communication bus 640, wherein the processor 610, the communication interface 620, and the memory 630 communicate with each other via the communication bus 640. The processor 610 can call logical instructions in the memory 630 to execute a method for determining the rock strata collapse angle, the method including:

[0157] During the advance of the coal mining face, the fracture point of the roof rock strata of the coal mining face is determined, and the spatial location information of the fracture point and the fracture time of the roof rock strata are obtained.

[0158] Based on the spatial location information, the vertical height of the fracture point from the coal mining face is determined;

[0159] Based on the fracture time and the spatial location information, the location of the fracture point is determined to lag behind the horizontal displacement data of the coal mining face.

[0160] Based on the vertical height of the fracture point from the coal mining face and the horizontal displacement data, the collapse angle of the roof strata is determined.

[0161] Furthermore, the logical instructions in the aforementioned memory 630 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, essentially, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0162] On the other hand, the present invention also provides a computer program product, the computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions, wherein when the program instructions are executed by a computer, the computer is able to execute the method for determining the rock strata collapse angle provided by the above methods, the method comprising:

[0163] During the advance of the coal mining face, the fracture point of the roof rock strata of the coal mining face is determined, and the spatial location information of the fracture point and the fracture time of the roof rock strata are obtained.

[0164] Based on the spatial location information, the vertical height of the fracture point from the coal mining face is determined;

[0165] Based on the fracture time and the spatial location information, the location of the fracture point is determined to lag behind the horizontal displacement data of the coal mining face.

[0166] Based on the vertical height of the fracture point from the coal mining face and the horizontal displacement data, the collapse angle of the roof strata is determined.

[0167] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to perform the methods for determining the collapse angle of the rock strata provided above, the method comprising:

[0168] During the advance of the coal mining face, the fracture point of the roof rock strata of the coal mining face is determined, and the spatial location information of the fracture point and the fracture time of the roof rock strata are obtained.

[0169] Based on the spatial location information, the vertical height of the fracture point from the coal mining face is determined;

[0170] Based on the fracture time and the spatial location information, the location of the fracture point is determined to lag behind the horizontal displacement data of the coal mining face.

[0171] Based on the vertical height of the fracture point from the coal mining face and the horizontal displacement data, the collapse angle of the roof strata is determined.

[0172] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0173] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0174] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for determining the caving angle of rock strata, characterized in that, The method includes: During the advance of the coal mining face, the fracture point of the roof rock strata of the coal mining face is determined, and the spatial location information of the fracture point and the fracture time of the roof rock strata are obtained. Based on the spatial location information, the vertical height of the fracture point from the coal mining face is determined; Based on the fracture time and the spatial location information, the location of the fracture point is determined to lag behind the horizontal displacement data of the coal mining face. Based on the vertical height of the fracture point from the coal mining face and the horizontal displacement data, the collapse angle of the roof strata is determined; During the advancement of the coal mining face, determining the fracture point where the roof strata of the coal mining face fractures includes: Based on multiple displacement gauges distributed in the borehole, the displacement changes at various positions in the borehole are monitored. The borehole is a construction connecting roadway between the main haulage roadway and the auxiliary haulage roadway, and is drilled at a preset angle along the coal seam of the coal mining face towards the roof strata. The multiple displacement gauges are used to monitor the displacement changes at different spatial positions in the borehole. During the advance of the coal mining face, the fracture point of the roof rock strata is determined based on the displacement change of the borehole corresponding to the fracture location of the roof rock strata. The borehole satisfies the first preset condition and the second preset condition; The first preset condition is: ； in, The length of the drilled hole, The length of the coal mining face. The direction angle is a preset angle in the borehole, where the direction angle is the angle between the borehole construction direction and the coal mining face advancement direction; The second preset condition is: ； in, The vertical distance from the roof strata to the coal face. The inclination angle is a preset angle in the borehole. The acquisition of the spatial location information of the fracture point and the fracture time of the top rock strata includes: Based on the spatial trajectory coordinates of the borehole, the spatial coordinates of the displacement gauge in the borehole corresponding to the location of the fracture point are determined, and the spatial location information of the fracture point is determined based on the spatial coordinates of the displacement gauge. Based on the displacement gauge in the borehole corresponding to the fracture point, the time of displacement change of the collapsed top rock layer is monitored, and the change time is taken as the fracture time.

2. The method for determining the caving angle of rock strata according to claim 1, characterized in that, The determination of the location of the fracture point, based on the fracture time and spatial location information, which lags behind the horizontal displacement data of the coal mining face, includes: Based on the fracture time, determine the first distance between the coal mining face and the stop line when the roof strata fracture. Based on the spatial location information and the location information of the initial drilling point of the borehole, the horizontal distance between the initial drilling point and the fracture point is determined. Based on the first distance, the horizontal distance from the initial borehole point to the fracture point, and the horizontal distance from the initial borehole point to the stop-mining line, the position of the fracture point is determined to lag behind the horizontal displacement data of the coal mining face.

3. The method for determining the caving angle of rock strata according to claim 1 or 2, characterized in that, The collapse angle of the top stratum is: ； in, The collapse angle of the top strata is given. The vertical height of the fracture point from the coal mining face. The horizontal displacement data is referred to here.

4. An apparatus for determining the caving angle of a rock stratum in performing the method for determining the caving angle of a rock stratum as described in claim 1, characterized in that, include: The fracture point determination module is used to determine the fracture point of the roof strata of the coal mining face during the advancement of the coal mining face, and to obtain the spatial location information of the fracture point and the fracture time of the roof strata. A vertical height determination module is used to determine the vertical height of the fracture point from the coal mining face based on the spatial location information. The horizontal displacement determination module is used to determine the position of the fracture point lagging behind the horizontal displacement data of the coal mining face based on the fracture time and the spatial location information. The collapse angle determination module is used to determine the collapse angle of the roof strata based on the vertical height of the fracture point from the coal mining face and the horizontal displacement data.

5. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method for determining the rock strata collapse angle as described in any one of claims 1 to 3.

6. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the method for determining the rock strata collapse angle as described in any one of claims 1 to 3.

7. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the method for determining the rock strata collapse angle as described in any one of claims 1 to 3.

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