Method for determining mining speed of working face based on effective time of pressure relief of protective layer

Abstract

The invention provides a working face mining speed determination method based on effective time of pressure relief of a protective layer, relates to the technical field of coal mining, and can solve the problems of long working face connection time of the protective layer and a protected layer and low mining efficiency caused by unreasonable mining speed during multi-coal-seam mining of a rock burst mine. The protected layer is excavated after the protection layer loses efficacy after pressure relief, and then impact instability of the working face is induced. The method comprises the steps that the reasonable length range of a working face is divided based on mine multi-coal-seam occurrence conditions; constructing a mining time period continuing scheme of different mining working face numbers; and calculating the reasonable excavation speed of the working face in each excavation period in combination with the effective time limit of pressure relief of the protective layer. The method is suitable for determining the mining speed of the working face within the effective time of protective layer pressure relief.

Description

Technical Field

[0001] This invention relates to the field of coal mining technology, specifically to a method for determining the working face mining speed based on the effective time of protective layer pressure relief. Background Technology

[0002] In my country, underground coal mines account for over 85% of total coal production. Underground mining typically involves mining 2-4 coal seams, sometimes 5-8, with very few single-seam mines. In multi-seam mines, the lower coal seams are generally mined at greater depths, resulting in higher levels of in-situ stress and a significant accumulation of elastic energy within the coal and rock mass, leading to a higher risk of rockburst. Therefore, in the regional rockburst prevention design for multi-seam rockburst mines, priority is usually given to mining the seams with lower rockburst risk. The resulting protective layer can relieve the stress level of the protected rockburst seam, reducing the likelihood of rockbursts occurring in the protected seam.

[0003] In multi-coal-seam rockburst mines, the coal seam occurrence conditions are complex, and the design working face lengths of different coal seams vary, making it difficult to ensure that the protective layer completely covers the protected layer. In multi-coal-seam joint mining, the spatiotemporal relationship of the mining face is complex, and the connection time between the protective layer working face and the protected layer working face is long, making it difficult to achieve the optimal pressure relief effect of the protective layer. When planning the mining speed in rockburst mines, the time limit of the protective layer is not considered, and mining operations of the protected layer are generally carried out after the pressure relief of the protective layer has failed.

[0004] Therefore, there is an urgent need for a method to determine the working face mining speed based on the effective time of protective layer decompression, to divide the reasonable length range of the working face based on the multiple coal seam occurrence conditions in the mine, to construct a mining period succession scheme for different numbers of working faces, and to calculate the reasonable mining speed of the working face in each mining period in combination with the effective time limit of protective layer decompression.

[0005] In the prior art, CN115964790A discloses a method for determining the advance of the coal mining working line under end-side mining conditions. Based on the open-pit mine design plan, the annual production capacity of the open-pit mine is determined. According to the design mining parameters, the width of the end-side flats, the slope angle of the bench, the bench height, and the width of the open-pit pit bottom are determined. Then, the coal seams within the working face of the mining area are numbered from top to bottom, and the thickness, density, and working line length of each coal bench are determined, as well as the mining speed, mining height, and mining width of end-side mining. Thus, the advance of the coal mining working line under end-side mining conditions is calculated. The existing technology uses the annual production capacity of the open-pit mine as a rigid constraint, fully considers the annual production capacity of end-face mining, and then determines the advance of the open-pit coal mining line. The calculation is simple and the results are accurate. At the same time, it can reduce the amount of drawing when repeatedly changing the advance position when drawing the annual planned project location plan. However, the existing technology still has defects. It only considers the parameters of the coal mine and ignores the impact of the mining process on the parameters that need to be determined. This will lead to the problem of mismatch between the parameters to be determined and the actual project progress, and insufficient progress of the parameters to be determined, thereby reducing the economic benefits of mining and increasing safety hazards.

[0006] The information disclosed in the background section is only intended to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0007] The purpose of this invention is to provide a method for determining the working face mining speed based on the effective time of protective layer depressurization, so as to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A method for determining the working face mining speed based on the effective time of protective layer pressure relief, comprising the following steps:

[0010] S1: Obtain the design parameters and measured parameters of the coal seam;

[0011] S2: Analyze the measured parameters to generate the maximum protective vertical distance of the protective layer, and analyze the maximum protective vertical distance based on the judgment criteria of the combined coal seam to obtain the mining type code of the coal seam;

[0012] S3: Determine whether the protective layer meets the requirements of the combined coal seam based on the mining type code. If it does not meet the requirements, the process ends. If it does meet the requirements, design a protective layer mining succession plan, divide the mining succession period, and obtain the mining parameters and mining parameter relationships that meet the pressure relief time limit and mining space location requirements.

[0013] S4: Obtain the coal seam mining adjustment code based on mining parameters and mining relationships;

[0014] S5: Based on the mining adjustment code and the actual situation of the mine, obtain the time period parameter code and its corresponding adjustment strategy;

[0015] S6: Based on the coal seam design parameters, time period parameter codes and their corresponding adjustment strategies, obtain the mining speed gradient and working face length range, and draw a "Comprehensive Balance Comparison Table of Optimal Mining-Tunneling Speed ​​Parameters".

[0016] Furthermore, the design parameters include the maximum design length Lbmax of the protective layer, the minimum design length Lbmin of the protective layer working face under the condition of maximizing economic benefits, the maximum design length LBmax of the working face within the mineable range of the protected layer, and the minimum design length LBmin of the working face of the protected layer under the condition of maximizing economic benefits. The measured parameters include the measured interlayer spacing, the cut length of the protective layer working face, the mining depth of the protective layer, and the interlayer hard rock content coefficient. The specific formula used to obtain the measured parameters is as follows:

[0017]

[0018] Among them, S 实际 The measured interlayer spacing is S1, S2, S3, ..., S. i Let L be the measured interlayer spacing of i uniformly arranged geological boreholes; L be the length of the protective layer working face, L1, L2, L3, ..., L j Let M be the length of the working face cut at j uniformly distributed points along the strike direction; M be the depth of the protective layer mining, M1, M2, M3, ..., M k Let be the measured depth of the protective layer from k uniformly distributed geological boreholes; β is the interlayer hard rock content coefficient, β1, β2, β3, ..., β l The interlayer hard rock content coefficient is the measured value of l uniformly distributed geological boreholes; Max represents the maximum value; Min represents the minimum value.

[0019] Furthermore, the specific logic for obtaining the mining type code is as follows: Query the curve showing the relationship between the cut length of the corresponding protective layer working face, the mining depth of the protective layer, the maximum vertical distance of the protective layer, the working face length, and the burial depth to obtain the theoretical maximum protective vertical distance of the protective layer; analyze the cut length of the protective layer working face and the mining depth of the protective layer to obtain the minimum effective thickness of the protective layer; perform mathematical analysis on the maximum protective vertical distance of the protective layer, the mining depth of the protective layer, the interlayer hard rock content coefficient, the minimum effective thickness of the protective layer, and the theoretical maximum protective vertical distance to obtain the maximum protective vertical distance of the protective layer; analyze the maximum protective vertical distance based on the judgment criteria of combined coal seams to obtain the mining type code of the coal seam; the specific formula for obtaining the minimum effective thickness of the protective layer is:

[0020]

[0021] Where M0 is the minimum effective thickness of the protective layer, L is the cut length of the protective layer working face, and M is the mining depth of the protective layer;

[0022] The specific formula used to obtain the maximum protective vertical distance of the protective layer is as follows:

[0023]

[0024] Where S is the maximum vertical distance of the protective layer; β is the interlayer hard rock content coefficient; and S0 is the theoretical maximum vertical distance of the protective layer.

[0025] The specific formula used to obtain the mining type code is as follows:

[0026]

[0027] Where C1 is the mining type code, S 实际 S represents the measured interlayer spacing, and S represents the maximum vertical distance of the protective layer. 实际 This represents the measured interlayer spacing.

[0028] Furthermore, the specific logic for obtaining mining parameters that meet the pressure relief time limit and mining space location requirements is as follows: Mining type code C1=1 is defined as "the protected coal seam is mined according to the requirements for independent coal seam mining," which means "the protected seam does not meet the requirements for combined coal seams," and the process ends; mining type code C1=2 is defined as "the protected coal seam is mined according to the requirements for combined coal seam mining," which means "the protected seam meets the requirements for combined coal seams," and the process continues. Then, a protective seam mining succession plan is designed, mining succession periods are divided, and mining parameters that meet the pressure relief time limit and mining space location requirements are obtained. These mining parameters include the maximum mining time for period 1, period 2, period 3, and period 4.

[0029] Furthermore, the specific logic behind the design of the protective layer mining succession plan is as follows: The mining and tunneling succession periods are divided into four periods based on the construction period, with one longwall face and two tunneling faces within a single mining area. These periods are designated as Period 1 to Period 4. The basic logic for this period division is as follows:

[0030] (1) Time period 1:

[0031] The working faces for tunneling in period 1 include the upper roadway of "protected coal seam section 2" and the lower roadway of "protected coal seam section 4".

[0032] The working face for the first phase of mining includes the working face for the "protected coal seam section 3".

[0033] (2) Period 2:

[0034] The working faces for tunneling in period 2 include the lower roadway of "protected coal seam section 2" and the upper roadway of "protected coal seam section 4".

[0035] The working face for the second phase of mining includes the working face for the "protected coal seam section 1".

[0036] (3) Time period 3:

[0037] The working faces for tunneling in period 3 include the upper roadway of "protected coal seam section 3" and the lower roadway of "protected coal seam section 5".

[0038] The working face for the third phase of mining includes the working face for the "protected coal seam section 4".

[0039] (4) Time period 4:

[0040] The working faces for tunneling in period 4 include the lower roadway of "protected coal seam section 3" and the upper roadway of "protected coal seam section 5".

[0041] The working face for the fourth period of mining includes the working face for the "protected coal seam section 2".

[0042] At this time, the "protected coal seam section 2" working face is located below the "protected coal seam section 2" goaf and the "protected coal seam section 2" protective layer. Subsequently, it is required that the connection time between the protective layer working face and the protected layer working face be less than the effective pressure relief time of the protective layer.

[0043] Furthermore, the specific logic underlying the acquisition of mining parameter relationships that satisfy the pressure relief time constraints and mining space location requirements is as follows: For each protected coal seam segment, the coal seam segment parameters are used to obtain mining parameters; the mining parameter relationships are then derived based on these parameters. The coal seam segment parameters include: the total length of the upper and lower roadways, the cut-in length, the average tunneling speed of the upper roadway, the average tunneling speed of the lower roadway, and the average recovery speed of the protected coal seam segment 1; the total length of the upper and lower roadways, the cut-in length, the average tunneling speed of the upper roadway, the average tunneling speed of the lower roadway, and the average recovery speed of the protected coal seam segment 2; and the total length of the upper and lower roadways, the cut-in length, and the average tunneling speed of the upper roadway of the protected coal seam segment 3. The average tunneling speed and average mining speed of the lower roadway; the total length of the upper roadway, the total length of the lower roadway, the cut-out length, the average tunneling speed of the upper roadway, the average tunneling speed of the lower roadway, and the average mining speed of the lower roadway of the protected coal seam section 1; the minimum horizontal distance between the upper roadway of "protected coal seam section 3" and the upper roadway of "protected coal seam section 2" in time period 1, and the layer misalignment angle in time period 1; the minimum horizontal distance between the lower roadway of "protected coal seam section 2" and the upper roadway of "protected coal seam section 4" and the opening spacing; the working face relocation and preparation time; the distance between the upper roadway of "protected coal seam section 4" and the upper roadway of "protected coal seam section 3" in time period 3; the layer misalignment angle in time period 3; the distance between the lower roadway of "protected coal seam section 3" and the upper roadway of "protected coal seam section 5" in time period 4 and the opening spacing;

[0044] The specific formula used to obtain the maximum mining time for period 1 is as follows:

[0045]

[0046]

[0047] Among them, T max1 The maximum mining time for period 1; L xed1 The total length of the upper roadway for "Protected Coal Seam Section 2" in time period 1; L xfu1 The total length of the longwall face in "Protected Coal Seam Section 3" during time period 1; L yu1 The cut length for "Protected Coal Seam Section 4" in time period 1; L xeu1 The total length of the lower roadway in "Protected Coal Seam Section 4" during time period 1; V xe11 V represents the average tunneling speed of the upper roadway in "protected coal seam section 2"; xe12 V represents the average tunneling speed of the lower roadway in "protected coal seam section 4"; x11 T represents the average mining speed of the longwall face in the "protected coal seam section 3" of time period 1; move Time for relocation and preparation of the work site; L ys1 L is the minimum horizontal distance between the upper roadway of "protected coal seam section 3" and the upper roadway of "protected coal seam section 2" in time period 1. ys1 α1 is the minimum horizontal distance between the upper roadway of "protected coal seam section 3" and the upper roadway of "protected coal seam section 2" in time period 1, and α1 is the layer fault angle in time period 1.

[0048] The specific formula used to obtain the maximum mining time for period 2 is as follows:

[0049]

[0050] Among them, T max2 The maximum mining time for period 2; L xfd2 The total length of the longwall face in "Protected Coal Seam Section 1" during time period 2; L xed2 L is the length of the lower roadway in "Protected Coal Seam Section 2" during time period 2; xeu2 The total length of the upper roadway for "Protected Coal Seam Section 4" in time period 2; L yd2 V is the cut-out length of the working face in "Protected Coal Seam Section 2" during time period 2; xe21 V represents the average tunneling speed of the lower roadway in time period 2, "protected coal seam section 2"; xe22 V represents the average tunneling speed of the upper roadway in the "protected coal seam section 4" of time period 2; x21 L represents the average mining speed of the longwall face in "Protected Coal Seam Section 1" during time period 2; yss2L is the minimum horizontal distance between the lower roadway of "protected coal seam section 2" and the upper roadway of "protected coal seam section 4"; ju2 The corrected distance for the delayed excavation of the lower roadway in "Protected Coal Seam Section 2";

[0051] The specific formula used to obtain the maximum mining time for period 3 is as follows:

[0052]

[0053] Among them, T max3 The maximum mining time for period 3; L xed3 L is the length of the upper roadway for "protected coal seam section 3" in time period 3; xfu3 The total length of the longwall face in the "protected coal seam section 4" of time period 3; L yu3 The length of the cut-off point in the working face of "Protected Coal Seam Section 5" during time period 3; L xeu3 The total length of the lower roadway in time period 3, "protected coal seam section 5"; V xe31 V represents the average tunneling speed of the upper roadway in the "protected coal seam section 3" during time period 3; xe32 V represents the average tunneling speed of the lower roadway in the "protected coal seam section 5" of time period 3; x31 α3 is the average mining speed of the longwall face in the "protected coal seam section 4" of time period 3; α3 is the fault angle of time period 3, L ys3 The distance between the upper roadway of "protected coal seam section 4" and the upper roadway of "protected coal seam section 3" in time period 3;

[0054] The specific formula used to obtain the maximum mining time for period 4 is as follows:

[0055]

[0056] L ju4 =150*cosθ4-L xs

[0057]

[0058] Among them, T max4 The maximum mining time for period 4; L xfd4 The total length of the longwall face in "Protected Coal Seam Section 2" during time period 4; L xed4 The length of the lower roadway in time period 4, "protected coal seam section 3"; L xeu4 The total length of the upper roadway for "Protected Coal Seam Section 5" in time period 4; L yd4 The length of the cut-off point in the working face of "Protected Coal Seam Section 3" during time period 4; V xe41 V represents the average tunneling speed of the lower roadway in "Protected Coal Seam Section 3" during time period 4; xe42 V represents the average tunneling speed of the upper roadway in the "protected coal seam section 5" of time period 4;x41 L represents the average mining speed of the longwall face in the "protected coal seam section 2" during time period 4. yss4 L represents the distance from the lower roadway of "protected coal seam section 3" to the upper roadway of "protected coal seam section 5" in time period 4. ju4 To correct for distance;

[0059] The specific formula used to obtain the "mining parameter relationship" that satisfies the pressure relief time limit and mining space location requirements is as follows:

[0060] T max1 +T max2 +T max3 +T max4 <1095 days

[0061] Furthermore, the specific formula used to obtain the coal seam mining adjustment code C2 is as follows:

[0062]

[0063] Among them, T max1 T represents the maximum mining time for period 1. max2 T represents the maximum mining time in time period 2. max3 T represents the maximum mining time in time period 3. max4 This represents the maximum time for mining in period 4.

[0064] Furthermore, the specific logic underlying the acquisition of time period parameter codes and their corresponding adjustment strategies is as follows: If the mining adjustment code C2 = 1, then the pressure relief condition is met, and mining proceeds as planned; if the mining adjustment code C2 = 2, then the pressure relief condition is not met, and the time period parameter code is acquired based on the current working condition, and the subsequent mining parameter adjustment strategy is determined based on the time period parameter code; the specific formula for acquiring the time period parameter code is as follows:

[0065]

[0066] C3 is the time period parameter code;

[0067] The specific logic behind the decision-making process for adjusting subsequent mining parameters based on the time period parameter code is as follows: If C3 = 1, then this time period is taken as the unit for adjusting mining parameters, and the basic principle of the adjustment is:

[0068] Ensure the pressure relief time limit requirement for the current period is met:

[0069]

[0070] Where i = 1, 3; L xed1 The total length of the upper roadway for "Protected Coal Seam Section 2" in time period 1. L xed3α1 is the upper roadway length of "protected coal seam section 3" in time period 3; α3 is the fault angle in time period 1; V is the fault angle in time period 3. xe11 V represents the average tunneling speed of the upper roadway in "protected coal seam section 2". xe12 V represents the average tunneling speed of the lower roadway in "protected coal seam section 4". x11 L represents the average mining speed of the longwall face in the "protected coal seam section 3" of time period 1. xfu1 The total length of the longwall face in "Protected Coal Seam Section 3" during time period 1; L xfu3 For the total length of the longwall face in the "protected coal seam section 4" of time period 3, T move Time for relocation and preparation of the work site; L yu1 L is the cut length of "protected coal seam section 4" in time period 1. yu3 The length of the cut-off point in the working face of "Protected Coal Seam Section 5" during time period 3; L xeu1 The total length of the lower roadway in "Protected Coal Seam Section 4" during time period 1; L xeu4 The total length of the upper roadway for "protected coal seam section 5" in time period 4;

[0071] Under the premise of complying with regulations, adjust the mining speed and total length of the working face to meet the requirements of formulas S531-1 to S531-3.

[0072] If C3 = 2, then this time period is used as the unit for adjusting mining parameters, and the basic principle of the adjustment is:

[0073]

[0074] Among them, L xed2 L is the length of the lower roadway in time period 2, "protected coal seam section 2". yd2 V represents the cut-out length of the working face in "Protected Coal Seam Section 2" during time period 2. xe21 L represents the average tunneling speed of the lower roadway in time period 2, "protected coal seam section 2"; xeu2 V is the total length of the upper roadway for "protected coal seam section 4" in time period 2. xe22 L represents the average tunneling speed of the upper roadway in the "protected coal seam section 4" of time period 2. xfd2 V represents the total length of the longwall face in "Protected Coal Seam Section 1" during time period 2; x21 T represents the average mining speed of the longwall face in "Protected Coal Seam Section 1" during time period 2. move Time for relocating and preparing the work site;

[0075] Under the premise of complying with regulations and systems, adjust the mining speed and total length of the working face to meet the requirements of formulas S532-1 to S532-3.

[0076] S533: If C3 = 3, then this time period is used as the unit for adjusting mining parameters, and the basic principle of the adjustment is:

[0077]

[0078] Where T0 represents the time from the end of mining of the upper protective layer to the present, and L... xfd4 L represents the total length of the longwall face in the "protected coal seam section 2" of time period 4. xed4 L is the length of the lower roadway in time period 4, "protected coal seam section 3". xeu4 For the total length of the upper roadway of "Protected Coal Seam Section 5" in time period 4, L yd4 V is the cut-out length of the working face in the "protected coal seam section 3" of time period 4. xe41 V represents the average tunneling speed of the lower roadway in the "protected coal seam section 3" during time period 4. xe42 V represents the average tunneling speed of the upper roadway in the "protected coal seam section 5" of time period 4. x41 T represents the average mining speed of the longwall face in the "protected coal seam section 2" during time period 4. move Time for relocating and preparing the work site;

[0079] Subject to compliance with regulations, adjust the mining speed and total length of the working face to meet the requirements of formulas S533-1 to S533-3.

[0080] Furthermore, the mining speed gradient and the working face length range L are obtained. b The basic logic for drawing the "Comprehensive Balance Comparison Table of Optimal Mining-Tunneling Speed ​​Parameters" is as follows: Define the mining-tunneling speed gradient; obtain the working face length range based on the design parameters; combine the mining-tunneling speed gradient and the working face length range to obtain the minimum mining-tunneling speed for different time periods; then combine the minimum mining-tunneling speed for different time periods with the working face length range to form the "Comprehensive Balance Comparison Table of Optimal Mining-Tunneling Speed ​​Parameters". The mining-tunneling speed refers to the tunneling speed and the recovery speed. The specific logic for defining the mining-tunneling speed gradient is as follows: define 1-5 meters per day as "slow speed", 6-10 meters per day as "medium speed", and 11-15 meters per day as "fast speed".

[0081] The specific formula used to obtain the range of working face length is as follows:

[0082] Min{Lb min LB min}≤L b ≤Max{Lb max LB max}

[0083] Lb max For the maximum design length of the protective layer, Lb minTo maximize economic benefits, the minimum length of the working face is designed, LB max LB is the maximum design length of the working face within the exploitable range of the protected layer. min The minimum length of the working face is designed to maximize economic benefits.

[0084] Compared with the prior art, the beneficial effects of the present invention are:

[0085] This invention obtains time period parameter codes based on actual conditions by setting them, and proposes targeted solutions based on the excavation characteristics of the specific time period corresponding to the time period parameter codes. The solutions are then precisely controlled to ensure a high degree of compatibility between the mining solution and the actual working conditions, avoiding resource waste or safety hazards caused by a single mining speed or working face length.

[0086] This invention obtains the mining speed gradient and working face length range based on the coal seam design parameters and time period parameter codes and their corresponding adjustment strategies, and draws a "Comprehensive Balance Comparison Table of Optimal Mining-Drilling Speed ​​Parameters". The design of the mining speed gradient allows the mining speed to be flexibly adjusted between slow, medium and fast speeds according to different conditions, ensuring the production efficiency and safety of the mine in different time periods and areas. By drawing the "Comprehensive Balance Comparison Table of Optimal Mining-Drilling Speed ​​Parameters", the combination of different mining speed gradients and working face length ranges is visualized, providing a clear and intuitive basis for decision-making. Attached Figure Description

[0087] Figure 1 This is a schematic diagram of the overall method flow of the present invention.

[0088] Figure 2 This is a graph showing the relationship between the maximum vertical distance of the protective layer, the length of the working face, and the burial depth.

[0089] Figure 3 This is a schematic diagram of the mining operation during period 1.

[0090] Figure 4 This is a partial schematic diagram of time period 1.

[0091] Figure 5 This is a schematic diagram of the mining operation during period 2.

[0092] Figure 6 This is a partial schematic diagram of time period 2.

[0093] Figure 7 This is a schematic diagram of the mining operation during period 3.

[0094] Figure 8 This is a partial schematic diagram of time period 3.

[0095] Figure 9 This is a schematic diagram of mining in period 4.

[0096] Figure 10 This is a partial schematic diagram of time period 4. Detailed Implementation

[0097] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0098] It should be noted that, unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0099] Example:

[0100] Please see Figure 1 The present invention provides a technical solution:

[0101] A method for determining the working face mining speed based on the effective time of protective layer pressure relief, comprising the following steps:

[0102] S1: Obtain the design parameters and measured parameters of the coal seam;

[0103] The design parameters include the maximum design length of the protective layer (LBmax), the minimum design length of the protective layer working face (Lbmin) under the condition of maximizing economic benefits, the maximum design length of the working face within the mineable range of the protected layer (LBmax), and the minimum design length of the working face of the protected layer under the condition of maximizing economic benefits (LBmin). The measured parameters include the measured interlayer spacing, the cut length of the protective layer working face, the mining depth of the protective layer, and the interlayer hard rock content coefficient. The specific formula used to obtain the measured parameters is as follows:

[0104]

[0105] Among them, S 实际 The measured interlayer spacing is S1, S2, S3, ..., S. i Let L be the measured interlayer spacing of i uniformly arranged geological boreholes; L be the length of the protective layer working face, L1, L2, L3, ..., L jLet M be the length of the working face cut at j uniformly distributed points along the strike direction; M be the depth of the protective layer mining, M1, M2, M3, ..., M k Let be the measured depth of the protective layer from k uniformly distributed geological boreholes; β is the interlayer hard rock content coefficient, β1, β2, β3, ..., β l The interlayer hard rock content coefficient is the measured value of l uniformly distributed geological boreholes; Max represents the maximum value; Min represents the minimum value.

[0106] S2: Analyze the measured parameters to generate the maximum protective vertical distance of the protective layer, and analyze the maximum protective vertical distance based on the judgment criteria of the combined coal seam to obtain the mining type code of the coal seam;

[0107] The specific logic for obtaining the mining type code is as follows: Query the curve showing the relationship between the cut length of the corresponding protective layer working face, the mining depth of the protective layer, the maximum vertical distance of the protective layer, the working face length, and the burial depth to obtain the theoretical maximum protective vertical distance of the protective layer; analyze the cut length of the protective layer working face and the mining depth of the protective layer to obtain the minimum effective thickness of the protective layer; perform mathematical analysis on the maximum protective vertical distance of the protective layer, the mining depth of the protective layer, the interlayer hard rock content coefficient, the minimum effective thickness of the protective layer, and the theoretical maximum protective vertical distance to obtain the maximum protective vertical distance of the protective layer; analyze the maximum protective vertical distance based on the judgment criteria of combined coal seams to obtain the mining type code of the coal seam; the specific formula for obtaining the minimum effective thickness of the protective layer is:

[0108]

[0109] Where M0 is the minimum effective thickness of the protective layer, L is the length of the protective layer working face, and M is the mining depth of the protective layer; the minimum effective thickness M0 of the protective layer is the minimum requirement to provide the required protective performance. Only when the effective thickness of the protective layer exceeds this minimum thickness can reliable protection be ensured within the maximum protection vertical distance range.

[0110] S0 represents the theoretical maximum vertical distance of the protective layer, which is related to the working face length L and the mining depth M. When L > 0.3M, L = 0.3M. The curve corresponding to the working face cut length and the relative relationship with the mining depth are obtained from this. Figure 3 ,pass Figure 2 Then the theoretical maximum vertical distance of the protective layer can be obtained.

[0111] The specific formula used to obtain the maximum protective vertical distance of the protective layer is as follows:

[0112]

[0113] Where S is the maximum vertical distance of the protective layer; β is the interlayer hard rock content coefficient; and S0 is the theoretical maximum vertical distance of the protective layer. The maximum vertical distance S of the protective layer reflects the maximum distance at which the protective layer can provide effective protection in the vertical direction, and can provide an important basis for judging the type of coal mining.

[0114] The specific formula used to obtain the mining type code is as follows:

[0115]

[0116] Where C1 is the mining type code, S 实际 S represents the measured interlayer spacing, and S represents the maximum vertical distance of the protective layer. 实际 This refers to the measured interlayer spacing. The maximum protective vertical distance S of the protective layer is compared with the measured interlayer spacing S... 实际 The mining type code C1 is obtained through comparison. The mining type code C1 can be used to clearly and simply determine the mineability of coal mines, providing an important basis for the formulation of mining plans.

[0117] S3: Determine whether the protective layer meets the requirements of the combined coal seam based on the mining type code. If it does not meet the requirements, the process ends. If it does meet the requirements, design a protective layer mining succession plan, divide the mining succession period, and obtain the mining parameters and mining parameter relationships that meet the pressure relief time limit and mining space location requirements.

[0118] The specific logic for obtaining mining parameters that meet the pressure relief time limit and mining space location requirements is as follows: Mining type code C1=1 is defined as "the protected coal seam is mined according to the requirements of independent coal seam mining," which means "the protected seam does not meet the requirements of combined coal seam mining," and the process ends. Mining type code C1=2 is defined as "the protected coal seam is mined according to the requirements of combined coal seam mining," which means "the protected seam meets the requirements of combined coal seam mining," and the process continues. Then, a protective seam mining succession plan is designed, mining succession time periods are divided, and mining parameters that meet the pressure relief time limit and mining space location requirements are obtained. These mining parameters include the maximum mining time for time period 1, the maximum mining time for time period 2, the maximum mining time for time period 3, and the maximum mining time for time period 4.

[0119] The specific logic behind the design of the protective layer mining succession plan is as follows: Mining and tunneling succession periods are divided according to the construction period. A single mining area is divided into four periods, namely Period 1 to Period 4, based on one longwall face and two tunneling faces. The basic logic for this period division is as follows:

[0120] (1) Time period 1:

[0121] The working faces for tunneling in period 1 include the upper roadway of "protected coal seam section 2" and the lower roadway of "protected coal seam section 4".

[0122] The working face for the first phase of mining includes the working face for the "protected coal seam section 3".

[0123] (2) Period 2:

[0124] The working faces for tunneling in period 2 include the lower roadway of "protected coal seam section 2" and the upper roadway of "protected coal seam section 4".

[0125] The working face for the second phase of mining includes the working face for the "protected coal seam section 1".

[0126] (3) Time period 3:

[0127] The working faces for tunneling in period 3 include the upper roadway of "protected coal seam section 3" and the lower roadway of "protected coal seam section 5".

[0128] The working face for the third phase of mining includes the working face for the "protected coal seam section 4".

[0129] (4) Time period 4:

[0130] The working faces for tunneling in period 4 include the lower roadway of "protected coal seam section 3" and the upper roadway of "protected coal seam section 5".

[0131] The working face for the fourth period of mining includes the working face for the "protected coal seam section 2".

[0132] At this time, the "protected coal seam section 2" working face is located below the "protected coal seam section 2" goaf and the "protected coal seam section 2" protective layer. Subsequently, it is required that the connection time between the protective layer working face and the protected layer working face be less than the effective pressure relief time of the protective layer.

[0133] As shown in Table 1:

[0134] Table 1 Time Period Division

[0135]

[0136] The specific logic behind obtaining the mining parameter relationship formula that meets the pressure relief time limit and mining space location requirements is as follows: For each protected coal seam section, the coal seam section parameters are used to obtain mining parameters; based on these parameters, the mining parameter relationship formula is obtained. The coal seam section parameters include: the total length of the upper and lower roadways, the cut-in length, the average tunneling speed of the upper roadway, the average tunneling speed of the lower roadway, and the average recovery speed of the lower roadway for protected coal seam section 1; the total length of the upper and lower roadways, the cut-in length, the average tunneling speed of the upper roadway, the average tunneling speed of the lower roadway, and the average recovery speed of the lower roadway for protected coal seam section 2; and the total length of the upper and lower roadways, the cut-in length, the average tunneling speed of the upper roadway, the average tunneling speed of the lower roadway, and the average recovery speed of the lower roadway for protected coal seam section 3. Average tunneling speed and average mining speed; total length of upper and lower roadways, cut-off length, average tunneling speed of upper roadways, average tunneling speed of lower roadways, and average mining speed of protected coal seam section 1; minimum horizontal distance between the upper roadway of "protected coal seam section 3" and the upper roadway of "protected coal seam section 2" in time period 1, and the layer misalignment angle in time period 1; minimum horizontal distance and opening spacing between the lower roadway of "protected coal seam section 2" and the upper roadway of "protected coal seam section 4"; working face relocation and preparation time; distance between the upper roadway of "protected coal seam section 4" and the upper roadway of "protected coal seam section 3" in time period 3; layer misalignment angle in time period 3; distance and opening spacing between the lower roadway of "protected coal seam section 3" and the upper roadway of "protected coal seam section 5" in time period 4; specifically as follows Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown.

[0137] The specific formula used to obtain the maximum mining time for period 1 is as follows:

[0138]

[0139] Among them, T max1 The maximum mining time for period 1; L xed1 The total length of the upper roadway for "Protected Coal Seam Section 2" in time period 1; L xfu1 The total length of the longwall face in "Protected Coal Seam Section 3" during time period 1; L yu1 The cut length for "Protected Coal Seam Section 4" in time period 1; L xeu1 The total length of the lower roadway in "Protected Coal Seam Section 4" during time period 1; V xe11 V represents the average tunneling speed of the upper roadway in "protected coal seam section 2"; xe12 V represents the average tunneling speed of the lower roadway in "protected coal seam section 4"; x11 T represents the average mining speed of the longwall face in the "protected coal seam section 3" of time period 1; move Time for relocation and preparation of the work site; L ys1L is the minimum horizontal distance between the upper roadway of "protected coal seam section 3" and the upper roadway of "protected coal seam section 2" in time period 1. ys1 α1 is the minimum horizontal distance between the upper roadway of "protected coal seam section 3" and the upper roadway of "protected coal seam section 2" in time period 1, and α1 is the layer fault angle in time period 1.

[0140] The specific formula used to obtain the maximum mining time for period 2 is as follows:

[0141]

[0142] Among them, T max2 The maximum mining time for period 2; L xfd2 The total length of the longwall face in "Protected Coal Seam Section 1" during time period 2; L xed2 L is the length of the lower roadway in "Protected Coal Seam Section 2" during time period 2; xeu2 The total length of the upper roadway for "Protected Coal Seam Section 4" in time period 2; L yd2 V is the cut-out length of the working face in "Protected Coal Seam Section 2" during time period 2; xe21 V represents the average tunneling speed of the lower roadway in time period 2, "protected coal seam section 2"; xe22 V represents the average tunneling speed of the upper roadway in the "protected coal seam section 4" of time period 2; x21 L represents the average mining speed of the longwall face in "Protected Coal Seam Section 1" during time period 2; yss2 L is the minimum horizontal distance between the lower roadway of "protected coal seam section 2" and the upper roadway of "protected coal seam section 4"; ju2 The corrected distance for the delayed excavation of the lower roadway in "Protected Coal Seam Section 2";

[0143] The specific formula used to obtain the maximum mining time for period 3 is as follows:

[0144]

[0145] Among them, T max3 The maximum mining time for period 3; L xed3 L is the length of the upper roadway for "protected coal seam section 3" in time period 3; xfu3 The total length of the longwall face in the "protected coal seam section 4" of time period 3; L yu3 The length of the cut-off point in the working face of "Protected Coal Seam Section 5" during time period 3; L xeu3 The total length of the lower roadway in time period 3, "protected coal seam section 5"; V xe31 V represents the average tunneling speed of the upper roadway in the "protected coal seam section 3" during time period 3; xe32 V represents the average tunneling speed of the lower roadway in the "protected coal seam section 5" of time period 3; x31 α3 is the average mining speed of the longwall face in the "protected coal seam section 4" of time period 3; α3 is the fault angle of time period 3, Lys3 The distance between the upper roadway of "protected coal seam section 4" and the upper roadway of "protected coal seam section 3" in time period 3;

[0146] The specific formula used to obtain the maximum mining time for period 4 is as follows:

[0147]

[0148] L ju4 =150*cosθ4-L xs

[0149]

[0150] Among them, T max4 The maximum mining time for period 4; L xfd4 The total length of the longwall face in "Protected Coal Seam Section 2" during time period 4; L xed4 The length of the lower roadway in time period 4, "protected coal seam section 3"; L xeu4 The total length of the upper roadway for "Protected Coal Seam Section 5" in time period 4; L yd4 The length of the cut-off point in the working face of "Protected Coal Seam Section 3" during time period 4; V xe41 V represents the average tunneling speed of the lower roadway in "Protected Coal Seam Section 3" during time period 4; xe42 V represents the average tunneling speed of the upper roadway in the "protected coal seam section 5" of time period 4; x41 L represents the average mining speed of the longwall face in the "protected coal seam section 2" during time period 4. yss4 L represents the distance from the lower roadway of "protected coal seam section 3" to the upper roadway of "protected coal seam section 5" in time period 4. ju4 To correct for distance;

[0151] The maximum time reflects the time constraints of mining activities and the requirements for working face connection within each time period. It can assess the feasibility of ensuring the mining plan and plays an important role in determining the working face mining speed for the effective time of protective layer pressure relief.

[0152] The specific formula used to obtain the "mining parameter relationship" that satisfies the pressure relief time limit and mining space location requirements is as follows:

[0153] T max1 +T max2 +T max3 +T max4 <1095 days

[0154] The “mining parameter relationship” reflects the feasibility of the mining plan. When the actual situation meets the “mining parameter relationship”, the mining plan is highly feasible and does not need to be adjusted.

[0155] S4: Obtain the coal seam mining adjustment code based on mining parameters and mining relationships;

[0156] The specific formula used to obtain the coal seam mining adjustment code C2 is as follows:

[0157]

[0158] Among them, T max1 T represents the maximum mining time for period 1. max2 T represents the maximum mining time in time period 2. max3 T represents the maximum mining time in time period 3. max4 This represents the maximum time for mining in period 4. The mining adjustment code directly encodes the current mining feasibility using the "mining parameter relationship formula," providing an important basis for adjusting the mining plan.

[0159] S5: Based on the mining adjustment code and the actual situation of the mine, obtain the time period parameter code and its corresponding adjustment strategy;

[0160] The specific logic underlying the acquisition of time period parameter codes and their corresponding adjustment strategies is as follows: If the mining adjustment code C2 = 1, the pressure relief condition is met, and mining proceeds as planned; if the mining adjustment code C2 = 2, the pressure relief condition is not met. Based on the current time period, the time period parameter code is acquired, and the subsequent mining parameter adjustment strategy is determined based on the time period parameter code. The specific formula for acquiring the time period parameter code is as follows:

[0161]

[0162] C3 is the time period parameter code; the time period parameter code determines the specific time period in which the scheme is located, making it convenient to make specific adjustments for the specific time period.

[0163] The specific logic behind the decision-making process for adjusting subsequent mining parameters based on the time period parameter code is as follows: If C3 = 1, then this time period is taken as the unit for adjusting mining parameters, and the basic principle of the adjustment is:

[0164] Ensure the pressure relief time limit requirement for the current period is met:

[0165]

[0166] Where i = 1, 3; L xed1 The total length of the upper roadway for "Protected Coal Seam Section 2" in time period 1. L xed3 α1 is the upper roadway length of "protected coal seam section 3" in time period 3; α3 is the fault angle in time period 1; V is the fault angle in time period 3. xe11 V represents the average tunneling speed of the upper roadway in "protected coal seam section 2". xe12 V represents the average tunneling speed of the lower roadway in "protected coal seam section 4".x11 L represents the average mining speed of the longwall face in the "protected coal seam section 3" of time period 1. xfu1 The total length of the longwall face in "Protected Coal Seam Section 3" during time period 1; L xfu3 For the total length of the longwall face in the "protected coal seam section 4" of time period 3, T move Time for relocation and preparation of the work site; L yu1 L is the cut length of "protected coal seam section 4" in time period 1. yu3 The length of the cut-off point in the working face of "Protected Coal Seam Section 5" during time period 3; L xeu1 The total length of the lower roadway in "Protected Coal Seam Section 4" during time period 1; L xeu4 The total length of the upper roadway for "protected coal seam section 5" in time period 4;

[0167] Under the premise of complying with regulations, adjust the mining speed and total length of the working face to meet the requirements of formulas S531-1 to S531-3.

[0168] If C3 = 2, then this time period is used as the unit for adjusting mining parameters, and the basic principle of the adjustment is:

[0169]

[0170] Among them, L xed2 L is the length of the lower roadway in time period 2, "protected coal seam section 2". yd2 V represents the cut-out length of the working face in "Protected Coal Seam Section 2" during time period 2. xe21 L represents the average tunneling speed of the lower roadway in time period 2, "protected coal seam section 2"; xeu2 V is the total length of the upper roadway for "protected coal seam section 4" in time period 2. xe22 L represents the average tunneling speed of the upper roadway in the "protected coal seam section 4" of time period 2. xfd2 V represents the total length of the longwall face in "Protected Coal Seam Section 1" during time period 2; x21 T represents the average mining speed of the longwall face in "Protected Coal Seam Section 1" during time period 2. move Time for relocating and preparing the work site;

[0171] Under the premise of complying with regulations and systems, adjust the mining speed and total length of the working face to meet the requirements of formulas S532-1 to S532-3.

[0172] S533: If C3 = 3, then this time period is used as the unit for adjusting mining parameters, and the basic principle of the adjustment is:

[0173]

[0174] Where T0 represents the time from the end of mining of the upper protective layer to the present, and L... xfd4L represents the total length of the longwall face in the "protected coal seam section 2" of time period 4. xed4 L is the length of the lower roadway in time period 4, "protected coal seam section 3". xeu4 For the total length of the upper roadway of "Protected Coal Seam Section 5" in time period 4, L yd4 V is the cut-out length of the working face in the "protected coal seam section 3" of time period 4. xe41 V represents the average tunneling speed of the lower roadway in the "protected coal seam section 3" during time period 4. xe42 V represents the average tunneling speed of the upper roadway in the "protected coal seam section 5" of time period 4. x41 T represents the average mining speed of the longwall face in the "protected coal seam section 2" during time period 4. move Time for relocating and preparing the work site;

[0175] Subject to compliance with regulations, adjust the mining speed and total length of the working face to meet the requirements of formulas S533-1 to S533-3.

[0176] Specific plans are proposed based on specific time periods, and the plans are precisely controlled to make the mining process more feasible and safer.

[0177] S6: Based on the coal seam design parameters, time period parameter codes and their corresponding adjustment strategies, obtain the mining speed gradient and working face length range, and draw a "Comprehensive Balance Comparison Table of Optimal Mining-Tunneling Speed ​​Parameters".

[0178] Obtain the mining speed gradient and working face length range L b The basic logic for drawing the "Comprehensive Balance Comparison Table of Optimal Mining-Tunneling Speed ​​Parameters" is as follows: Define the mining-tunneling speed gradient; obtain the working face length range based on the design parameters; combine the mining-tunneling speed gradient and the working face length range to obtain the minimum mining-tunneling speed for different time periods; then combine the minimum mining-tunneling speed for different time periods with the working face length range to form the "Comprehensive Balance Comparison Table of Optimal Mining-Tunneling Speed ​​Parameters". The mining-tunneling speed refers to the tunneling speed and the recovery speed. The specific logic for defining the mining-tunneling speed gradient is as follows: define 1-5 meters per day as "slow speed", 6-10 meters per day as "medium speed", and 11-15 meters per day as "fast speed".

[0179] The specific formula used to obtain the range of working face length is as follows:

[0180] Min{Lb min LB min}≤L b ≤Max{Lb max LB max}

[0181] Lb max For the maximum design length of the protective layer, Lb minTo maximize economic benefits, the minimum length of the working face is designed, LB max LB is the maximum design length of the working face within the exploitable range of the protected layer. min The minimum working face length is designed to maximize economic benefits. The range of working face lengths, within which the mining speed maximizes economic returns, is listed, assuming the project can proceed.

[0182] The above formulas are all dimensionless calculations. The formulas are derived from software simulations based on a large amount of collected data to obtain the most recent real-world results. The preset parameters in the formulas are set by those skilled in the art according to the actual situation.

[0183] The above embodiments can be implemented, in whole or in part, by software, hardware, firmware, or any other combination thereof. When implemented in software, the above embodiments can be implemented, in whole or in part, as a computer program product. Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution.

[0184] 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; they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0185] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A method for determining the working face excavation speed based on the effective time of protective layer pressure relief, characterized in that: The specific steps include: S1: Obtain design parameters and measured parameters of coal seam; S2: Analyze the measured parameters to generate the maximum vertical distance of the protective layer, and analyze the maximum vertical distance of the protective layer by combining the judgment basis of the coal seam to obtain the mining type code of the coal seam; S3: Determine whether the protective layer meets the requirements of the combined coal seam according to the mining type code. If not, end the process; if yes, design a mining succession plan for the protective layer, divide the mining succession period, and obtain mining parameters and mining parameter relationship equations that meet the pressure relief time limit and mining space position requirements; S4: Obtaining the mining adjustment code of the coal seam according to the mining parameters and the mining relationship; S5: According to the mining adjustment code and the actual situation of the mine, the time period parameter code and its corresponding adjustment strategy are obtained; S6: According to the design parameters of the coal seam, the time period parameter code and its corresponding adjustment strategy, the mining speed gradient and the working face length range are obtained and a "comprehensive balance comparison table of mining-excavation speed optimization parameters" is drawn.

2. A method for determining the working face excavation speed based on the effective time of protective layer pressure relief according to claim 1, characterized in that: The design parameters include the maximum design length Lbmax of the protective layer, the minimum design length Lbmin of the working face of the protective layer under the condition of maximizing economic benefits, the maximum design length LBmax of the working face within the mining range of the protected layer, and the minimum design length LBmin of the working face of the protected layer under the condition of maximizing economic benefits. The measured parameters include the measured interlayer spacing, the cutting length of the working face of the protective layer, the mining depth of the protective layer and the interlayer hard rock content coefficient. The specific formula for obtaining the measured parameters is: Among them, S 实际 is the measured interlayer distance; S1, S2, S3, ..., S i is the measured interlayer spacing of i uniformly arranged geological boreholes; L is the length of the protective layer working surface, L1, L2, L3, ..., L j is the length of the working face cut measured at j evenly distributed points along the strike direction; M is the mining depth of the protective layer, M1, M2, M3, ..., M k is the mining depth of the protective layer measured by k uniformly arranged geological boreholes; β is the interlayer hard rock content coefficient, β1, β2, β3, ..., β l is the interlayer hard rock content coefficient measured by l evenly arranged geological drill holes; Max is the maximum value; Min is the minimum value.

3. The method for determining the working face excavation speed based on the effective time of protective layer pressure relief according to claim 2 is characterized in that: The specific logic for obtaining the mining type code is as follows: query the relationship curve between the maximum vertical distance of the protective layer and the working face length and burial depth of the corresponding protective layer working face cutting length and protective layer mining depth to obtain the theoretical maximum vertical distance of the protective layer; analyze the cutting length of the protective layer working face and the mining depth of the protective layer to obtain the minimum effective thickness of the protective layer; perform mathematical analysis on the maximum vertical distance of the protective layer, the mining depth of the protective layer, the interlayer hard rock content coefficient, the minimum effective thickness of the protective layer and the theoretical maximum vertical distance of the protective layer to obtain the maximum vertical distance of the protective layer; analyze the maximum vertical distance of the protective layer by combining the judgment basis of the coal seam to obtain the mining type code of the coal seam; the specific formula for obtaining the minimum effective thickness of the protective layer is as follows: Among them, M0 is the minimum effective thickness of the protective layer, L is the cutting length of the protective layer working face, and M is the mining depth of the protective layer; The specific formula for obtaining the maximum vertical distance of the protective layer is: Among them, S is the maximum vertical distance of the protective layer; β is the interlayer hard rock content coefficient, and S0 is the theoretical maximum vertical distance of the protective layer; The specific formula for obtaining the mining type code is: Among them, C1 is the mining type code, S 实际 is the measured interlayer distance, S is the maximum vertical distance of the protective layer, S 实际 is the measured interlayer distance.

4. The method for determining the working face excavation speed based on the effective time of protective layer pressure relief according to claim 1 is characterized in that: The specific logic for obtaining the mining parameters that meet the pressure relief time limit and the mining space location requirements is as follows: the mining type code C1=1 is defined as "the protected coal seam is mined in accordance with the independent coal seam mining requirements", that is, "the protected layer does not meet the combined coal seam" requirements, and the process ends; the mining type code C1=2 is defined as "the protected coal seam is mined in accordance with the combined coal seam mining requirements", that is, "the protected layer meets the combined coal seam" requirements, and the process continues, then the protective layer mining succession plan is designed, the mining succession time periods are divided, and the mining parameters that meet the pressure relief time limit and the mining space location requirements are obtained; the mining parameters include the maximum time for mining in time period 1, the maximum time for mining in time period 2, the maximum time for mining in time period 3, and the maximum time for mining in time period 4.

5. A method for determining the working face excavation speed based on the effective time of protective layer pressure relief according to claim 4, characterized in that: The specific logic for designing the mining succession plan of the protective layer is: divide the mining succession period. According to the construction period, one stope face and two excavation faces in a single mining area are divided into four periods, namely period 1 to period 4. The basic logic of period division is as follows: (1) Period 1: The working faces of excavation in period 1 include: the upper roadway of "protected coal seam section 2" and the lower roadway of "protected coal seam section 4"; The working faces for mining in period 1 are: the mining face of "protection coal seam section 3"; (2) Period 2: The working faces of excavation in period 2 include: the lower roadway of "protected coal seam section 2" and the upper roadway of "protected coal seam section 4"; The working faces for mining in period 2 are: the mining face of "protected coal seam section 1"; (3) Period 3: The working faces of excavation in period 3 include: the upper roadway of "protected coal seam section 3" and the lower roadway of "protected coal seam section 5"; The working faces for mining in period 3 are: the mining face of "protection coal seam section 4"; (4) Period 4: The working faces of excavation in period 4 include: the lower roadway of "protected coal seam section 3" and the upper roadway of "protected coal seam section 5"; The working faces for mining in period 4 are: the mining face of "protected coal seam section 2"; At this time, the working face of "protected coal seam section 2" is located in the goaf of "protective coal seam section 2" and below the protective layer of "protective coal seam section 2". Subsequently, it is required that the connection time between the protective layer working face and the protected layer working face be less than the effective pressure relief time of the protective layer.

6. The method for determining the working face excavation speed based on the effective time of protective layer pressure relief according to claim 1 is characterized in that: The specific logic for obtaining the mining parameter relationship that meets the pressure relief time limit and the mining space position requirements is as follows: the coal seam section parameters of each protected coal seam section, the mining parameters are obtained through the coal seam section parameters; the mining parameter relationship is obtained according to the mining parameters; the coal seam section parameters include: the total length of the upper tunnel, the total length of the lower tunnel, the length of the cut eye, the average driving speed of the upper tunnel, the average driving speed of the lower tunnel and the average recovery speed of the protected coal seam section 1, the total length of the upper tunnel, the total length of the lower tunnel, the length of the cut eye, the average driving speed of the upper tunnel, the average driving speed of the lower tunnel and the average recovery speed of the protected coal seam section 2; the total length of the upper tunnel, the total length of the lower tunnel, the length of the cut eye, the average driving speed of the upper tunnel, the average driving speed of the lower tunnel and the average recovery speed of the protected coal seam section 3 The average excavation speed and average mining speed; the total length of the upper tunnel, the total length of the lower tunnel, the length of the cut eye, the average excavation speed of the upper tunnel, the average excavation speed and the average mining speed of the lower tunnel of the protected coal seam section 1; the minimum plane distance from the upper tunnel of "protected coal seam section 3" to the upper tunnel of "protected coal seam section 2" in period 1, the layer stagger angle of period 1; the minimum plane distance and opening spacing from the lower tunnel of "protected coal seam section 2" to the upper tunnel of "protected coal seam section 4"; the moving and preparation time of the working face, the distance between the upper tunnel of "protected coal seam section 4" to the upper tunnel of "protected coal seam section 3" in period 3; the layer stagger angle of period 3, the distance and opening spacing from the lower tunnel of "protected coal seam section 3" in period 4 to the upper tunnel of "protected coal seam section 5"; The specific formula for obtaining the maximum time of mining in period 1 is: Among them, T max1 The maximum time of mining in period 1; L xed1 The total length of the upper tunnel in period 1 "protected coal seam section 2"; L xfu1 L is the total length of the mining face in period 1 "protected coal seam section 3"; yu1 L is the cut length of the 4" protection coal seam section in the time period 1; xeu1 V is the total length of the lower tunnel in period 1 "protected coal seam section 4"; xe11 V is the average excavation speed of the upper roadway in the "protected coal seam section 2"; xe12 V is the average excavation speed of the lower tunnel of the "protected coal seam section 4"; x11 is the average recovery speed of the recovery working face in the period 1 "protected coal seam section 3"; T move Time for moving and preparing for the work surface; L ys1 L is the minimum plane distance from the upper roadway of "protected coal seam section 3" to the upper roadway of "protected coal seam section 2" in period 1, ys1 is the minimum plane distance from the upper roadway of "protected coal seam section 3" to the upper roadway of "protected coal seam section 2" in period 1, and α1 is the layer stagger angle in period 1; The specific formula for obtaining the maximum time of mining in period 2 is: Among them, T max2 The maximum time of mining in period 2; L xfd2 L is the total length of the mining face in period 2 "protected coal seam section 1"; xed2 L is the length of the lower tunnel in the protected coal seam section 2 of period 2; xeu2 The total length of the upper tunnel in period 2 "protected coal seam section 4"; L yd2 V is the cut length of the working face in the protected coal seam section 2 in period 2; xe21 V is the average excavation speed of the lower roadway in period 2 "protected coal seam section 2"; xe22 V is the average excavation speed of the upper roadway in period 2 "protected coal seam section 4"; x21 is the average mining speed of the mining face in period 2 "protected coal seam section 1"; L yss2 L is the minimum plane distance from the lower roadway of "protected coal seam section 2" to the upper roadway of "protected coal seam section 4"; ju2 Corrected distance calculated for delayed excavation of lower tunnel in "Protected Coal Seam Section 2"; The specific formula for obtaining the maximum time for mining in period 3 is: Among them, T max3 The maximum time for mining in period 3; L xed3 L is the length of the upper tunnel in the protected coal seam section 3" of period 3; xfu3 L is the total length of the mining face in period 3 "protected coal seam section 4"; yu3 L is the cutting length of the working face in the protection coal seam section 5” in the time period 3; xeu3 V is the total length of the lower tunnel in the period 3 "protection coal seam section 5"; xe31 V is the average excavation speed of the upper roadway in the protected coal seam section 3 in period 3; xe32 V is the average excavation speed of the lower tunnel in period 3 "protected coal seam section 5"; x31 is the average mining speed of the mining face in the "protected coal seam section 4" of period 3; α3 is the layer stagger angle of period 3, L ys3 The distance between the upper roadway of "protected coal seam section 4" and the upper roadway of "protected coal seam section 3" in time period 3; The specific formula for obtaining the maximum time of mining in period 4 is: THE ju4 =150*cosθ4-L xs Among them, T max4 The maximum time for mining in period 4; L xfd4 L is the total length of the mining face in period 4 "protected coal seam section 2"; xed4 L is the length of the lower tunnel in the protected coal seam section 3” of period 4; xeu4 The total length of the upper tunnel in period 4 "protection coal seam section 5"; L yd4 V is the cut length of the working face in the protected coal seam section 3" of period 4; xe41 V is the average excavation speed of the lower tunnel in period 4 "protected coal seam section 3"; xe42 V is the average excavation speed of the upper roadway in period 4 "protected coal seam section 5"; x41 is the average recovery speed of the recovery working face in period 4 "protected coal seam section 2"; L yss4 The distance from the lower roadway of "protected coal seam section 3" to the upper roadway of "protected coal seam section 5" in period 4, L ju4 To correct the distance; The specific formula for obtaining the "mining parameter relationship" that meets the pressure relief time limit and mining space position requirements is: T max1 +T max2 +T max3 +T max4 <1095 days.

7. The method for determining the working face excavation speed based on the effective time of protective layer pressure relief according to claim 1 is characterized in that: The specific formula for obtaining the mining adjustment code C2 of the coal seam is: Among them, T max1 is the maximum time of mining in period 1, T max2 is the maximum time of mining in period 2, T max3 is the maximum time of mining in period 3, T max4 The maximum time for mining in period 4.

8. The method for determining the working face excavation speed based on the effective time of protective layer pressure relief according to claim 1 is characterized in that: The specific logic for obtaining the time period parameter code and its corresponding adjustment strategy is as follows: if the mining adjustment code C2=1, the pressure relief condition is met and mining is carried out as planned; if the mining adjustment code C2=2, the pressure relief condition is not met, and the time period parameter code is obtained according to the time period of the current working condition, and the subsequent mining parameter adjustment strategy is decided according to the time period parameter code; The specific formula for obtaining the time period parameter code is: Among them, C3 is the time period parameter code; The specific logic for deciding the subsequent mining parameter adjustment strategy based on the time period parameter code is as follows: If C3 = 1, the current time period is used as the unit for mining parameter adjustment, and the basic principle of adjustment is: Ensure the pressure relief time limit requirements for the current period: Where i = 1, 3; L xed1 is the total length of the upper tunnel in period 1 "protected coal seam section 2", L xed3 is the length of the upper tunnel in the protected coal seam section 3 of period 3; α1 is the layer stagger angle of period 1, α3 is the layer stagger angle of period 3, V xe11 is the average excavation speed of the upper roadway in the "protected coal seam section 2", V xe12 is the average excavation speed of the lower tunnel of the "protected coal seam section 4", V x11 is the average mining speed of the mining face in the "protected coal seam section 3" of period 1, L xfu1 L is the total length of the mining face in period 1 "protected coal seam section 3"; xfu3 is the total length of the mining face in period 3 "protected coal seam section 4", T move Time for moving and preparing for the work surface; L yu1 The length of the cut in the 4" protection coal seam section of the time period 1, L yu3 L is the cutting length of the working face in the protection coal seam section 5” in the time period 3; xeu1 The total length of the lower tunnel in period 1 "protected coal seam section 4"; L xeu4 The total length of the upper tunnel of period 4 "protected coal seam section 5"; Under the premise of complying with regulations, adjust the excavation speed and total length of the working face to meet formulas S531-1 to S531-3. If C3 = 2, the current period is used as the unit for adjusting the mining parameters, and the basic principle of adjustment is: Among them, L xed2 L is the length of the lower tunnel in the protected coal seam section 2 of period 2. yd2 V is the cut length of the working face in the protected coal seam section 2” during period 2, xe21 is the average excavation speed of the lower tunnel in period 2 "protected coal seam section 2"; L xeu2 V is the total length of the upper tunnel in the period 2 "protection coal seam section 4", xe22 is the average excavation speed of the upper roadway in period 2 "protected coal seam section 4", L xfd2 V is the total length of the mining face in period 2 "protected coal seam section 1"; x21 is the average mining speed of the mining face in period 2 "protected coal seam section 1", T move time for moving and preparing the work surface; Under the premise of complying with regulations, adjust the excavation speed and total length of the working face to meet formulas S532-1 to S532-3. S533: If C3=3, the current period is used as the unit for adjusting the mining parameters, and the basic principle of the adjustment is: Among them, T0 is the time from the end of mining of the upper protective layer to the present, L xfd4 L is the total length of the mining face in the protected coal seam section 2 of period 4, xed4 L is the length of the lower tunnel in the protected coal seam section 3" of period 4, xeu4 The total length of the upper tunnel in the period 4 "protection coal seam section 5", L yd4 V is the cut length of the 3" working face in the protected coal seam section of period 4, xe41 is the average excavation speed of the lower tunnel in the protected coal seam section 3 in period 4, V xe42 is the average excavation speed of the upper roadway in period 4 "protected coal seam section 5", V x41 is the average mining speed of the mining face in period 4 "protected coal seam section 2", T move time for moving and preparing the work surface; On the premise of complying with regulations and systems, adjust the mining speed and total length of the working face to meet formulas S533-1 to S533-3.

9. The method for determining the working face excavation speed based on the effective time of protective layer pressure relief according to claim 1, characterized in that: Get the mining speed gradient and working face length range L b The basic logic of drawing the "comprehensive balance comparison table of mining-excavation speed optimization parameters" is as follows: define the mining speed gradient; obtain the working face length range according to the design parameters, combine the mining speed gradient and the working face length range, obtain the minimum mining speed in different time periods, and then combine the minimum mining speed in different time periods and the working face length range to form a "comprehensive balance comparison table of mining-excavation speed optimization parameters", where the mining speed refers to the excavation speed and the recovery speed; the specific logic for defining the mining speed gradient is: 1 to 5 meters per day is defined as "slow", 6 to 10 meters per day is defined as "medium", and 11 to 15 meters per day is defined as "fast"; The specific formula for obtaining the working surface length range is: <h2 style=";text-align:left;direction:ltr">Min{Lb<h2 style=";text-align:left;direction:ltr"> min <h2 style=";text-align:left;direction:ltr"> LB<h2 style=";text-align:left;direction:ltr"> min <h2 style=";text-align:left;direction:ltr">}≤L<h2 style=";text-align:left;direction:ltr"> b <h2 style=";text-align:left;direction:ltr"> ≤Max{Lb<h2 style=";text-align:left;direction:ltr"> max <h2 style=";text-align:left;direction:ltr"> LB<h2 style=";text-align:left;direction:ltr"> max <h2 style=";text-align:left;direction:ltr">} Where Lb max is the maximum design length of the protective layer, Lb min To maximize economic benefits, the minimum length of the working face is designed, LB max LB is the maximum design length of the working face within the mining range of the protected layer. min Design the minimum length of the working face to maximize economic benefits.

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