Method and device for predicting water inflow from working face of vertical coal seam open-pit mine converted to underground mining

Abstract

The present invention discloses a method and device for predicting water inflow at a vertical coal seam open-pit mine transitioning to underground mining. The method comprises: generalizing a hydrogeological model to determine the components of the normal water inflow value of the mining face; obtaining a first calculation formula for calculating the normal water inflow value of the left and right aquifers of the coal seam and the normal water inflow value of the upper part under constant water head conditions based on hydrogeological parameters; summing up to obtain the normal water inflow value per unit width of the mining face; obtaining a second calculation formula for calculating the normal water inflow value per unit width of the mining face based on the normal water inflow value per unit width of the mining face; and calculating the maximum water inflow prediction value of the mining face based on the second calculation formula and according to the ratio coefficient of the normal water inflow value of the mining face to the maximum water inflow value. This method has more accurate prediction results, provides a technical basis for the design of vertical coal seam mining faces and mine drainage systems, saves mine infrastructure investment costs, and ensures safe and efficient production of mines.

Description

Technical Field

[0001] The present invention relates to the technical field of water inflow prediction for working faces, and in particular to a method and device for predicting water inflow for a working face in a vertical coal seam open-pit mine converted to underground mining. Background Art

[0002] At present, a lot of research has been done on the underground water inflow of coal seam mining. Commonly used methods include analytical method, hydrogeological analogy method, water balance method and numerical simulation method.

[0003] Previous studies mainly focused on the occurrence conditions of nearly horizontal and gently inclined coal seams. There was little research on the evaluation and prediction of water inflow under the occurrence conditions of steeply inclined coal seams. There was also insufficient research on the occurrence conditions of nearly vertical coal seams with larger inclination angles, and there was a lack of methods to predict water inflow from mining working faces.

[0004] Disadvantages of existing technology:

[0005] Analytical method: For the engineering geological conditions of coal seams and aquifers that are nearly vertical during coal mining, the conventional large well method and other analytical methods for predicting water inflow from the working face during nearly horizontal coal mining are no longer suitable for such engineering geological conditions. It is necessary to analyze the engineering geological conditions of nearly vertical coal seams so that the prediction results can have good applicability.

[0006] Hydrogeological analogy: Calculations require that the hydrogeological conditions of new and existing mines be similar, and that the existing mines have long-term observational data on water inflow. This method uses the linear correlation between water inflow, mining area, and water level drawdown to make a rough comparison. During production, the calculated results often differ significantly from the actual observed water inflow.

[0007] Water balance method: The calculation result is the maximum water inflow of the ore deposit. The estimated water inflow of the mine cannot be divided into levels and has no guiding significance for the production of a single working face.

[0008] Numerical simulation method: There are more predictions in mines with complex hydrogeological conditions, but the simplification of boundaries and the selection of calculation parameters are difficult, which affects the prediction accuracy. Summary of the Invention

[0009] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0010] To this end, one objective of the present invention is to propose a method for predicting water inflow from a vertical coal seam open-pit mining face. This method analyzes the characteristics of the seepage field during vertical coal seam mining, fully considers the dynamic replenishment of loose deposits within the upper backfill pit generated by open-pit mining, and, based on Darcy's law, derives a formula for predicting the normal water inflow from the mining face. This more accurate prediction provides a technical basis for the design of vertical coal seam mining faces and mine drainage systems, saving mine infrastructure investment and ensuring safe and efficient mine production.

[0011] Another object of the present invention is to provide a device for predicting water inflow from a vertical coal seam open-pit mine to underground mining.

[0012] To achieve the above objectives, an embodiment of the present invention provides a method for predicting water inflow from a working face in a vertical coal seam open-pit mine converted to underground mining, comprising:

[0013] The hydrogeological model is generalized to determine the components of the normal water inflow value of the mining face; wherein the normal water inflow value of different mining positions of the working face includes: the normal water inflow value of the aquifers on the left and right sides of the coal seam and the normal water inflow value of the upper part under normal water head conditions;

[0014] Obtaining hydrogeological parameters, and obtaining a first calculation formula based on the hydrogeological parameters to calculate the normal water inflow values ​​of the left and right aquifers of the coal seam and the normal water inflow value of the upper aquifer under a constant water head condition;

[0015] Based on the first calculation formula, the normal water inflow per unit width of the mining face is obtained by summing up;

[0016] Based on the normal water inflow value per unit width of the mining face, a second calculation formula for calculating the normal water inflow value of the mining face is obtained;

[0017] Based on the second calculation formula and according to the ratio coefficient of the normal water inflow value and the maximum water inflow value of the mining working face, the maximum water inflow prediction value of the mining working face is calculated.

[0018] To achieve the above-mentioned object, another embodiment of the present invention provides a device for predicting water inflow at a vertical coal seam open-pit mine conversion underground mining face, comprising:

[0019] A model generalization module is used to generalize the hydrogeological model and determine the components of the normal water inflow value of the mining face; wherein the normal water inflow value of different mining positions of the working face includes: the normal water inflow value of the aquifers on the left and right sides of the coal seam and the normal water inflow value of the upper part under normal water head conditions;

[0020] A first calculation module is used to obtain hydrogeological parameters and obtain a first calculation formula based on the hydrogeological parameters for the normal water inflow values ​​of the left and right aquifers of the coal seam and the normal water inflow value of the upper aquifer under a constant water head condition;

[0021] A calculation and summation module, configured to obtain a normal water inflow value per unit width of the mining face by summing the first calculation formula;

[0022] A second calculation module is configured to obtain a second calculation formula for calculating the normal water inflow value of the mining working face based on the normal water inflow value per unit width of the mining working face;

[0023] The calculation prediction module is used to calculate the maximum water inflow prediction value of the mining working face based on the second calculation formula and according to the ratio coefficient of the normal water inflow value and the maximum water inflow value of the mining working face.

[0024] The method and device for predicting water inflow from the mining face of an open-pit mine with a vertical coal seam according to the embodiment of the present invention provide more accurate prediction results, provide a technical basis for the design of the mining face of the vertical coal seam and the mine drainage system, save mine infrastructure investment costs, and ensure safe and efficient production in the mine.

[0025] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0027] Figure 1 Flow chart of a method for predicting water inflow from a vertical coal seam open-pit mine to underground mining face according to an embodiment of the present invention;

[0028] Figure 2 Schematic diagram of the supply amount of the two sides of the vertical coal seam working face according to an embodiment of the present invention;

[0029] Figure 3 A generalized diagram of a hydrogeological model according to an embodiment of the present invention;

[0030] Figure 4 Schematic diagram of the structure of a device for predicting water inflow at a vertical coal seam open-pit mine conversion underground mining face according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0032] The following describes a method and device for predicting water inflow at a vertical coal seam open-pit mine transitioning to underground mining according to an embodiment of the present invention with reference to the accompanying drawings.

[0033] First, a method for predicting water inflow at a vertical coal seam open-pit mine transitioning to underground mining according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0034] Figure 1 The present invention is a flow chart of a method for predicting water inflow from a vertical coal seam open-pit mine to underground mining according to an embodiment of the present invention.

[0035] like Figure 1 As shown, the method for predicting water inflow from a vertical coal seam open-pit mine to underground mining working face includes the following steps:

[0036] S1. Generalize the hydrogeological model and determine the components of the normal water inflow value of the mining face; the normal water inflow value of different mining positions of the working face includes: the normal water inflow value of the aquifers on the left and right sides of the coal seam and the normal water inflow value of the upper part under normal water head conditions;

[0037] S2, obtaining hydrogeological parameters, and obtaining a first calculation formula based on the hydrogeological parameters to calculate the normal water inflow values ​​of the left and right aquifers of the coal seam and the normal water inflow value of the upper aquifer under a constant water head condition;

[0038] S3, based on the first calculation formula, summing up to obtain the normal water inflow per unit width of the mining face;

[0039] S4, obtaining a second calculation formula for calculating the normal water inflow value of the mining working face based on the normal water inflow value per unit width of the mining working face;

[0040] S5. Based on the second calculation formula and according to the ratio coefficient of the normal water inflow value and the maximum water inflow value of the mining working face, the maximum water inflow prediction value of the mining working face is calculated.

[0041] Specifically, the method of the embodiment of the present invention can be simplified into the following steps:

[0042] Step 1: Generalization of hydrogeological model;

[0043] Step 2: Determination of hydrogeological parameters;

[0044] Step 3: Prediction of normal water inflow on the left bank;

[0045] Step 4: Prediction of normal water inflow on the right bank;

[0046] Step 5: Prediction of normal water inflow from the upper part under constant head conditions;

[0047] Step 6: Prediction of normal water inflow per unit width of the working face;

[0048] Step 7: Prediction of normal water inflow at different mining positions on the working face;

[0049] Step 8: Determine the ratio coefficient between normal water inflow and maximum water inflow;

[0050] Step 9: Prediction of the maximum water inflow at the working face.

[0051] In step 1 above, the generalization process of the hydrogeological model is as follows:

[0052] First, the boundaries were generalized: Based on the distribution of aquifers and aquitards, geological structures, and the hydraulic connection between groundwater and surface water, the calculation boundaries were generalized into a first-class boundary for the normal groundwater level (constant head), a second-class boundary for a given lateral runoff, and a third-class boundary for the relationship between a given groundwater lateral flow and the normal groundwater level (constant head). Next, the internal structure was generalized: the spatial and temporal distribution of the study area's aquifer groups, water-bearing media, groundwater movement, and coal mining plans (mining depth, scope, and method, etc.) was generalized.

[0053] By analyzing the sources of water inrush from the working face, it was found that the water inrush from the working face of a vertical coal seam open-pit mine converted to underground mining is mainly supplied by the lateral aquifers on the left and right sides of the coal seam and the loose backfill body on the upper part of the coal seam.

[0054] Q 总 =Q 左 +Q 右 +Q 上

[0055] After the loose water body is drained and drained on the surface and underground, it is considered as Q 上 ≈0.

[0056] In the above step 2, the process of obtaining hydrogeological parameters is as follows:

[0057] The two aquifers are recharged normally:

[0058] Permeability coefficient K: It is obtained based on the calculation results of the pumping test data of the borehole during the exploration. If it is a single permeable layer, K is the permeability coefficient of the permeable layer; if there are multiple permeable layers, T is the thickness of each permeable layer;

[0059] Water head height H: Select the stable water level elevation near the pumping hole and use the mining elevation of the working face as the calculation reference surface;

[0060] Average seepage diameter L: the length from the two sides of the coal seam to the horizontal boundary of the aquifer.

[0061] Normal recharge of upper loose backfill under constant head conditions:

[0062] Permeability coefficient K: weighted average permeability coefficient of loose bodies and collapse areas;

[0063] Hydraulic gradient I: (I = h / L, h is the head loss, L is the infiltration path, determined based on the selected hydrogeological model).

[0064] In the above steps 3 and 4, the normal water yield of the two aquifers is predicted as follows:

[0065] The coal seam and the aquifer are nearly vertical, and conventional large well method and other methods for predicting water inflow from the working face during near-horizontal coal mining are no longer suitable for such engineering geological conditions.

[0066] Based on Darcy's law, combined Figure 2 The prediction formula of normal recharge of aquifers on both sides of coal seam and aquifer in nearly vertical mining working face is derived.

[0067] like Figure 2 As shown, the bottom is an impermeable layer, and the sides are aquifers. Before the working face is mined, the groundwater level in the aquifer is horizontal, as shown by the dotted line in the figure. After the working face is mined, the water level drops to a gently descent curve, indicating a gradual seepage flow.

[0068] Using Darcy's law formula Q = KAI, the leakage of a single width section is When the horizontal distance x→L and the groundwater level z→H, the leakage formula of a single-width section is derived as follows:

[0069] Points earned:

[0070]

[0071] Taking the mining elevation of the working face as the calculation reference surface,

[0072] In order to express the calculation concept of the formula more clearly, use express.

[0073] The calculation formula for the recharge of the two sides of the aquifer in the nearly vertical mining face of the coal seam and the aquifer is as follows:

[0074]

[0075] Where q is the leakage of a single width section (m 3 / d·m); B is the total width of the leakage section (m); K is the permeability coefficient (m / d); L is the average seepage diameter (m); and H is the water head height (m).

[0076] The following combination Figure 3 The embodiments of the present invention are further described.

[0077] like Figure 3 As shown, the left bank has aquifer I, aquiclude, and aquifer II from the farthest to the nearest working face. The working face mining elevation is used as the calculation reference surface. The recharge volume of the single-width section of the left bank aquifer is:

[0078]

[0079] in,

[0080] There is only aquifer III on the right bank. The mining elevation of the working face is used as the calculation reference surface. The recharge of the single-width section of the aquifer on the right bank is:

[0081]

[0082] In the above step 5, the normal water inflow from the upper part is predicted under the condition of constant water head:

[0083] If the aquifer in the loose backfill above the working face is not drained, water in the loose backfill in the upper pit will continue to flow into the working face during mining. Assuming that the loose deposit in the pit is dynamically recharged by atmospheric precipitation and adjacent aquifers, and is continuously under constant head conditions, Darcy's law is used to calculate the normal recharge rate of the upper pit backfill during working face mining:

[0084] Q=KAI

[0085] Among them, Q is the normal supply volume of the upper mine backfill (m 3 / d); K is the permeability coefficient (m / d); A is the mining area (m 2 ); I is the hydraulic gradient.

[0086]

[0087] Among them, the permeability coefficient K s is the weighted average permeability coefficient of loose bodies and collapse areas, K s =(K1L1+K2L2) / (L1+L2); for nearly vertical coal seams, I=H s / L s ≈1; a is the strike length of the mining face.

[0088] In step 6 above, the normal water inflow per unit width of the working face is predicted:

[0089] q总 =q 左 +q 右 +q 上

[0090]

[0091] Sum the above three formulas to obtain the normal water inflow per unit width of the working surface.

[0092] In step 7 above, the normal water inflow at different mining positions on the working face is predicted:

[0093] Q 总 =Q 左 +Q 右 +Q 上

[0094]

[0095] By summing the above three formulas, we can obtain the prediction of normal water inflow at different mining positions on the working face.

[0096] In step eight above, determine the ratio coefficient of normal water inflow to maximum water inflow:

[0097] Maximum water inflow refers to the peak water inflow under normal circumstances during mining operations, primarily related to mining impacts and rainfall. Based on recent underground water inflow observations from the target mine or adjacent mines, the ratio coefficient between normal and maximum water inflow is determined.

[0098] In the above step nine, the maximum water inflow of the working face is predicted based on the calculation results of steps seven and eight.

[0099] According to the method for predicting water inflow in the underground mining face of a vertical coal seam open-pit mine according to the embodiment of the present invention, the prediction result is more accurate, which provides a technical basis for the design of the vertical coal seam mining face and the mine drainage system, saves the mine infrastructure investment cost, and ensures the safe and efficient production of the mine.

[0100] Furthermore, the method for predicting water inflow at the working face of a vertical coal seam open-pit mine converted to underground mining in an embodiment of the present invention takes the water inflow prediction of the +3700m working face in the west wing of a mining area of ​​a Qinghai mine converted to underground mining in a nearly vertical coal seam open-pit mine as an example, and the steps are as follows:

[0101] Step 1: The water gushing from the +3700m mining face on the west wing of the first mining area is mainly supplied by the lateral recharge of the aquifers Ⅰ, Ⅱ and Ⅲ on both sides of the coal seam and the loose backfill body on the upper part of the coal seam.

[0102] Step 2: Based on the pumping test data of the borehole during the exploration period and the on-site hydrological survey, the hydrogeological parameters required for the calculation are obtained.

[0103] Step 3: Predict the normal recharge of the Zuobang aquifer:

[0104] The left bank has aquifer I, aquiclude, and aquifer II from the farthest distance to the working face. The working face mining elevation is used as the calculation reference surface. The recharge volume of the single-width section of the left bank aquifer is:

[0105]

[0106] in,

[0107] Using the hydrogeological parameters obtained in step 2 (K Ⅰ =0.016m / d, K Ⅱ =0.016m / d, K0=0.002m / d; T Ⅰ =50m, T0=10m; L Ⅰ =63m, L Ⅱ =15m, L0=56m; H Ⅰ =82.13m, H Ⅱ =40m.) Calculate the normal recharge of the left aquifer.

[0108] Step 4: Predict the normal recharge of the right aquifer:

[0109] There is only aquifer III on the right bank. The mining elevation of the working face is used as the calculation reference surface. The recharge of the single-width section of the aquifer on the right bank is:

[0110]

[0111] Using the hydrogeological parameters obtained in step 2 (K Ⅲ =0.0045m / d; L Ⅲ =98m;H Ⅲ =82.13m.) Calculate the normal recharge of the right aquifer.

[0112] Through the calculations in steps three and four, the estimated normal recharge of the two sides of the aquifer during the mining process of the +3700m working face in the west wing of the first mining area is obtained. The estimated results are shown in Table 1.

[0113] Table 1

[0114] Working face mining length (m) <![CDATA[Q 左 (m 3 / h)]]> <![CDATA[Q 右 (m 3 / h)]]> 60 1.04 0.39 120 2.08 0.77 180 3.12 1.16 240 4.16 1.55 300 5.20 1.94 360 6.24 2.32 392 (working face mining completed) 6.80 2.53

[0115] Step 5: Predict the normal recharge volume of the upper loose backfill under constant head conditions.

[0116]

[0117] Among them, the permeability coefficient K s is the weighted average permeability coefficient of loose bodies and collapse areas, K s=(K1L1+K2L2) / (L1+L2).

[0118] The hydrogeological parameters obtained in step 2 (K1 = 0.33 m / d, K2 = 0.001 m / d; L1 = 42.94 m, L2 = 39.19 m; H s =147.48m; L s =169.25m; L 煤 =22.6m.) Calculate the normal recharge rate of the upper loose backfill under constant head conditions during mining at the +3700m working face in the west wing of mining area 1. The results are shown in Table 2.

[0119] Table 2

[0120]

[0121]

[0122] Step 6: Through the calculations of steps 3, 4 and 5, the normal water inflow per unit width of the working surface is obtained.

[0123] Step 7: Based on the calculations in Steps 3, 4, and 5, the normal water inflow at different mining locations on the working face is obtained. The calculation results are shown in Table 3.

[0124] Table 3

[0125] Working mining length (m) <![CDATA[Q 左 (m 3 / h)]]> <![CDATA[Q 右 (m 3 / h)]]> <![CDATA[Q 上 (m 3 / h)]]> <![CDATA[Q 总 (m 3 / h)]]> <![CDATA[Q 总 ′(m 3 / h)]]> 60 1.04 0.39 8.34 9.77 1.43 120 2.08 0.77 16.69 19.54 2.85 180 3.12 1.16 25.03 29.31 4.28 240 4.16 1.55 33.37 39.08 5.71 300 5.20 1.94 41.72 48.86 7.14 360 6.24 2.32 50.06 58.62 8.56 392 (working face mining completed) 6.80 2.53 54.51 63.84 9.33

[0126] Note: Q 总 : Normal water inflow from the working face under normal water head conditions without surface drainage wells and underground exploration and drainage; Q 总 ': Normal water inflow from surface dewatering wells and underground water exploration and drainage working faces.

[0127] Step 8: Determine the ratio coefficient of normal water inflow to maximum water inflow:

[0128] According to the mine's underground water inflow observation results for the past four years, the mine's normal water inflow is 58.50m 3 / h, maximum water inflow 125.04m 3 / h, minimum water inflow 19.97m 3 / h, take maximum water inflow / normal water inflow ≈ 2.14.

[0129] Step 9: Predict the maximum water inflow at the working face:

[0130] The maximum water inflow at the working face is obtained through calculations in steps 7 and 8. The calculation results are shown in Table 4.

[0131] Table 4

[0132] type <![CDATA[Normal water inflow (m 3 / h)]]> <![CDATA[Maximum water inflow (m 3 / h)]]> <![CDATA[The surface dewatering wells and underground water exploration and drainage work Q have not been implemented 总 > 63.84 136.62 <![CDATA[Surface dewatering wells have been implemented and underground water exploration and drainage work has been carried out Q 总 ′]]> 9.33 19.97

[0133] Comparative analysis of predicted water inflow and measured water inflow results:

[0134] The planned mining length of the +3700m working face in the west wing of Mining Area 1 is 369m, with a remaining mining length of 248m. Underground water exploration and drainage work was carried out before mining began, but no surface dewatering wells were implemented.

[0135] The measured value of water inflow at the working face: normal water inflow 4.65m 3 / h, maximum water inflow 23.92m 3 / h. A comparative analysis was conducted on the predicted water inflow of the mined working face and the measured water inflow. The comparison results are shown in Table 5.

[0136] Table 5

[0137]

[0138] Note: Q 总 : Water inflow from the working face under normal water head conditions without surface drainage wells and underground exploration and drainage; Q 总 ': Water inflow from surface dewatering wells and underground water exploration and drainage working faces.

[0139] Before and after the implementation of surface dewatering wells and underground exploration and drainage work, the predicted normal water inflow was 2.88m 3 / h、19.71m 3 / h, the measured normal water inflow is 4.65m 3 / h is between the two. Before and after the implementation of surface drainage wells and underground exploration and drainage work, the predicted maximum water inflow was 6.16m 3 / h、42.18m 3 / h, the maximum measured water inflow is 23.92m 3 The results show that the method has a high accuracy rate and can meet the water inflow prediction requirements of vertical coal seam open-pit mines with underground mining operations.

[0140] In summary, the conversion of open-pit mining to underground mining is an important method for mining companies to develop deep resources. The present invention specifically provides a method for predicting the normal water inflow of the working face of a vertical coal seam open-pit mine converted to underground mining. A hydrogeological model of the working face of a vertical coal seam open-pit mine converted to underground mining is established, the seepage and recharge conditions of the working face of a vertical coal seam open-pit mine converted to underground mining are analyzed, the source of water inflow from the working face is determined, and the water inflow per unit width of the working face and the water inflow at different mining positions of the working face are predicted. Compared with the traditional large well method and other methods for predicting the water inflow of the working face during near-horizontal coal mining, this method, based on the analysis of the seepage field characteristics during the vertical coal seam mining process, fully considers the dynamic recharge of the loose accumulation body in the upper backfill pit generated by the conversion of open-pit mining to underground mining, and derives the normal water inflow prediction formula for the mining face based on Darcy's law. The prediction result is more accurate, which provides a technical basis for the design of the vertical coal seam mining face and the mine drainage system, saves the investment cost of mine infrastructure, and ensures the safe and efficient production of the mine. It has important practical significance and promotion value for vertical coal seam open-pit mining enterprises to use open-pit to shaft mining to mine deep mineral resources.

[0141] The method for predicting water inflow in the underground mining face of a vertical coal seam open-pit mine according to the embodiment of the present invention has more accurate prediction results, provides a technical basis for the design of the vertical coal seam mining face and the mine drainage system, saves mine infrastructure investment costs, and ensures safe and efficient production in the mine.

[0142] Next, a device for predicting water inflow at a vertical coal seam open-pit mine transitioning to underground mining working face according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0143] Figure 4 The present invention is a schematic structural diagram of a device for predicting water inflow at a vertical coal seam open-pit mine conversion underground mining face according to one embodiment of the present invention.

[0144] like Figure 4 As shown, the device 10 for predicting water inflow from a vertical coal seam open-pit mine to underground mining working face includes: a model generalization module 100, a first calculation module 200, a calculation and summation module 300, a second calculation module 400 and a calculation prediction module 500.

[0145] The model generalization module 100 is used to generalize the hydrogeological model and determine the components of the normal water inflow value of the mining face; wherein the normal water inflow value of different mining positions of the working face includes: the normal water inflow value of the aquifers on the left and right sides of the coal seam and the normal water inflow value of the upper part under normal water head conditions;

[0146] The first calculation module 200 is used to obtain hydrogeological parameters and obtain a first calculation formula based on the hydrogeological parameters for the normal water inflow values ​​of the left and right aquifers of the coal seam and the normal water inflow value of the upper aquifer under constant water head conditions;

[0147] A calculation and summation module 300 is configured to obtain a normal water inflow value per unit width of a mining face by summing the first calculation formula;

[0148] The second calculation module 400 is used to obtain a second calculation formula for calculating the normal water inflow value of the mining working face based on the normal water inflow value per unit width of the mining working face;

[0149] The calculation prediction module 500 is used to calculate the maximum water inflow prediction value of the mining working face based on the second calculation formula and according to the ratio coefficient of the normal water inflow value and the maximum water inflow value of the mining working face.

[0150] Furthermore, the model generalization module 100 includes:

[0151] A boundary generalization module is used to obtain hydraulic connection calculation formulas for various hydraulic parameters of the hydrogeological model and calculate various types of groundwater boundary data based on the hydraulic connection calculation formulas; and

[0152] The internal generalization module is used to calculate and generalize the spatiotemporal distribution of various structural state data of the hydrogeological model.

[0153] Furthermore, the first calculation module 200 includes:

[0154] The two-wall parameter acquisition module is used to calculate the hydrogeological parameters of the normal water inflow value of the aquifers on the left and right sides of the coal seam: the first permeability coefficient is obtained based on the calculation results of the exploration drilling pumping test, the stable water level elevation near the pumping hole is selected, the working face mining elevation is used as the calculation reference surface to determine the water head height, and the average seepage diameter is calculated based on the length from the two sides of the coal seam to the horizontal boundary of the aquifer; and

[0155] The constant head parameter acquisition module is used to calculate the hydrogeological parameters of the upper normal water inflow value under constant head conditions: the second permeability coefficient is calculated based on the weighted average of the stratum permeability coefficients in the preset condition area, and the hydraulic gradient is determined based on the hydrogeological model.

[0156] Furthermore, the above-mentioned device 10 also includes: a supply quantity acquisition module, which is used to calculate the normal water inflow value of the left and right aquifers of the coal seam based on the mining elevation of the working face as the calculation reference surface.

[0157] Furthermore, the above-mentioned device 10 also includes: a ratio coefficient determination module, which is used to determine the ratio coefficient of the normal water inflow value and the maximum water inflow value of the mining face based on the observation results of the underground water inflow of the target prediction mine or the adjacent mines in recent years.

[0158] It should be noted that the above explanation of the method embodiment is also applicable to the device of this embodiment and will not be repeated here.

[0159] The device for predicting water inflow in the mining face of an open-pit mine with vertical coal seams according to the embodiment of the present invention has more accurate prediction results, provides a technical basis for the design of the mining face of the vertical coal seam and the mine drainage system, saves the investment cost of mine infrastructure, and ensures the safe and efficient production of the mine.

[0160] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0161] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0162] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A method for predicting water inflow from a vertical coal seam open-pit mine to underground mining, characterized in that: The following steps are involved: The hydrogeological model is generalized to determine the components of the normal water inflow value of the mining face; wherein the normal water inflow value of different mining positions of the working face includes: the normal water inflow value of the aquifers on the left and right sides of the coal seam and the normal water inflow value of the upper part under normal water head conditions; Obtain hydrogeological parameters, and obtain a first calculation formula based on the hydrogeological parameters to calculate the normal water inflow values ​​of the left and right aquifers of the coal seam and the normal water inflow value of the upper part under constant head conditions, including: the recharge rate of the single-width profile of the left aquifer: Among them, the left bank has aquifer Ⅰ, aquiclude 0 and aquifer Ⅱ from far to near the working face, q is the leakage of single width section (m 3 / d·m); K is the permeability coefficient (m / d); L is the average seepage diameter (m); H is the water head height (m), T is the thickness of each permeable layer; Recharge of single width section of right aquifer: Among them, there is only III aquifer on the right bank. Normal replenishment of upper pit backfill: Among them, S represents the upper mine backfill, and the permeability coefficient K s is the weighted average permeability coefficient of the loose body 1 and the collapse area 2, K s =(K1L1+K2L2) / (L1+L2), L 煤 Indicates the thickness of the coal seam; Based on the first calculation formula, the normal water inflow per unit width of the mining face is obtained by summing up; Based on the normal water inflow value per unit width of the mining face, a second calculation formula for calculating the normal water inflow value of the mining face is obtained; Based on the second calculation formula and according to the ratio coefficient of the normal water inflow value and the maximum water inflow value of the mining working face, a maximum water inflow prediction value of the mining working face is calculated; The generalization of the hydrogeological model includes: Obtaining hydraulic connection calculation formulas for multiple hydraulic parameters of the hydrogeological model, and calculating multiple types of groundwater boundary data based on the hydraulic connection calculation formulas; and Calculating and generalizing the spatiotemporal distribution of various structural state data of the hydrogeological model; The obtaining of hydrogeological parameters includes: Obtaining hydrogeological parameters for calculating the normal water inflow of the aquifers on the left and right sides of the coal seam: obtaining a first permeability coefficient based on the calculation results of the exploratory drilling pumping test, selecting the stable water level elevation near the pumping hole, determining the water head height using the working face mining elevation as the calculation reference surface, and calculating the average seepage diameter based on the length from the two sides of the coal seam to the horizontal boundary of the aquifer; and Obtaining hydrogeological parameters for calculating the normal water inflow value of the upper part under the constant head condition: calculating a second permeability coefficient by weighted average of the stratum permeability coefficients in the area under preset conditions, and determining the hydraulic gradient according to the hydrogeological model; The method also includes: calculating the single-width profile recharge value of the left side aquifer and the single-width profile recharge value of the right side aquifer of the coal seam based on the working face mining elevation as the calculation reference surface.

2. The method according to claim 1, characterized in that Based on the observation results of the underground water inflow of the target predicted mine or the adjacent mines in recent years, the ratio coefficient of the normal water inflow value to the maximum water inflow value of the mining face is determined.

3. A device for predicting water inflow from a vertical coal seam open-pit mine to underground mining, characterized in that: include: A model generalization module is used to generalize the hydrogeological model and determine the components of the normal water inflow value of the mining face; wherein the normal water inflow value of different mining positions of the working face includes: the normal water inflow value of the aquifers on the left and right sides of the coal seam and the normal water inflow value of the upper part under normal water head conditions; The first calculation module is used to obtain hydrogeological parameters and obtain a first calculation formula for the normal water inflow values ​​of the left and right aquifers of the coal seam and the normal water inflow value of the upper part under constant head conditions based on the hydrogeological parameters, including: the recharge volume of the single-width profile of the left aquifer: Among them, the left bank has aquifer Ⅰ, aquiclude 0 and aquifer Ⅱ from far to near the working face, q is the leakage of single width section (m 3 / d·m); K is the permeability coefficient (m / d); L is the average seepage diameter (m); H is the water head height (m), T is the thickness of each permeable layer; Recharge of the single-width section of the right aquifer: Among them, there is only III aquifer on the right bank. Normal replenishment of upper pit backfill: Among them, S represents the upper mine backfill, and the permeability coefficient K s is the weighted average permeability coefficient of the loose body 1 and the collapse area 2, K s =(K1L1+K2L2) / (L1+L2), L 煤 Indicates the thickness of the coal seam; A calculation and summation module, configured to obtain a normal water inflow value per unit width of the mining face by summing the first calculation formula; A second calculation module is configured to obtain a second calculation formula for calculating the normal water inflow value of the mining working face based on the normal water inflow value per unit width of the mining working face; a calculation prediction module, configured to calculate a maximum water inflow prediction value of the mining working face based on the second calculation formula and according to a ratio coefficient between the normal water inflow value and the maximum water inflow value of the mining working face; The model generalization module includes: a boundary generalization module, configured to obtain hydraulic connection calculation formulas for various hydraulic parameters of the hydrogeological model, and calculate various types of groundwater boundary data according to the hydraulic connection calculation formulas; and An internal generalization module, for calculating and generalizing the spatiotemporal distribution of various structural state data of the hydrogeological model; The first calculation module includes: The two-wall parameter acquisition module is used to calculate the hydrogeological parameters of the normal water inflow value of the aquifers on the left and right sides of the coal seam: the first permeability coefficient is obtained based on the calculation results of the exploration drilling pumping test, the stable water level elevation near the pumping hole is selected, the head height is determined using the working face mining elevation as the calculation reference surface, and the average seepage diameter is calculated based on the length from the two sides of the coal seam to the horizontal boundary of the aquifer; and A constant head parameter acquisition module is used to calculate the hydrogeological parameter acquisition of the upper normal water inflow value under the constant head condition: a second permeability coefficient is calculated based on the weighted average of the stratum permeability coefficients in the preset condition area, and a hydraulic gradient is determined based on the hydrogeological model; The device also includes: a supply amount acquisition module, which is used to calculate the single-width profile supply amount value of the left side aquifer of the coal seam and the single-width profile supply amount value of the right side aquifer of the coal seam based on the working face mining elevation as the calculation reference surface.

4. The device according to claim 3, characterized in that The device also includes: a ratio coefficient determination module, which is used to determine the ratio coefficient of the normal water inflow value and the maximum water inflow value of the mining face based on the observation results of the underground water inflow of the target predicted mine or the adjacent mine in recent years.

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