A kind of underground emergency water level monitoring system and method

Abstract

The invention discloses an underground emergency water level monitoring system, comprising a monitor placed in a well site, a control panel, a winch wound with a cable, and a measuring probe placed underground; it also comprises a fish float depth sounding device, the measuring probe is connected to the control panel through a cable, the monitor is connected to the control panel, the fish float depth sounding device is placed in front of the measuring probe lens and connected to the measuring probe, and a method using the system is provided. The beneficial effects of the invention are as follows: the system can realize real-time detection of water level height, draw a trend chart of water level change over time, qualitatively and quantitatively evaluate the amount of water inrush in the mine, predict the water inrush situation in the mine and the effect of emergency water blocking in advance, provide help for arranging various tasks in the coal mine in advance, and improve work efficiency and monitoring continuity.

Description

Technical Field

[0001] The invention relates to a coal mine underground water control system and method, and in particular to an underground emergency water level monitoring system and method. Background Art

[0002] The groundwater (pore water source, fissure water source, karst water source) and surface water source in the pores of the surrounding rock of the ore body gushing out under pressure is called water inrush. The sudden water inrush with large amount and strong force is called water burst. It is extremely harmful. Water blocking refers to blocking the underground water inrush. In order to prevent the sudden water inrush during mining and cause the flooding accident affecting the whole mine, waterproof gates and waterproof walls are usually set at the appropriate section where the tunnel passes through the waterproof layer with sufficient strength.

[0003] On May 25, 2017, a water inrush accident occurred in the bottom pumping tunnel of the 12123 working face constructed by the 303 team of the development zone 3 of Paner Mine, causing the mine to be flooded. As the underground video monitoring system could not work and personnel could not go down the mine, leaders and experts at all levels of the bureau and mine were unable to timely understand the underground water inrush situation and the extent of mine flooding. At this critical moment, the ground geophysical exploration team of the exploration department was ordered to take the well video logging instrument to the auxiliary shaft of Paner Mine overnight, and urgently built a mine emergency water level monitoring system through the shaft of the auxiliary shaft, making it the only channel for leaders and experts at all levels of the bureau and mine to timely understand the underground water inrush situation.

[0004] Once a major water inrush accident occurs in a coal mine, personnel are unable to go down the mine, underground equipment cannot work, and ground personnel cannot promptly learn about the underground flooding situation, which brings great difficulties to emergency rescue work. It is impossible to predict the mine water inrush situation and the rescue and water blocking effect in advance, and provide help for the advance arrangement of various tasks. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an underground emergency water level monitoring system and method which solves the problem that the underground water level cannot be monitored and the underground water inrush situation cannot be predicted in advance in the above-mentioned background technology.

[0006] The present invention solves the above technical problems through the following technical solutions: The present invention discloses an underground emergency water level monitoring system, including a monitor placed at the well site, a control panel, a winch wrapped with a cable, and a measuring probe placed underground; the measuring probe is connected to the control panel via a cable, and the monitor is connected to the control panel.

[0007] Preferably, it also includes a fishing float depth measuring device, which is placed in front of the measuring probe lens and connected to the measuring probe.

[0008] Preferably, the fishing float depth measuring device includes a fishing line, a fishing float, and a lead weight; the fishing float is placed in front of the lens of the measuring probe through the fishing line, and the lead weight is connected to the bottom of the fishing float.

[0009] Preferably, the measuring probe is a SYKJ-18 downhole video logging instrument.

[0010] Preferably, the cable is provided with a mark.

[0011] The present invention also provides a method for monitoring using the underground emergency water level monitoring system, and the specific steps are as follows:

[0012] (1) Arrange the monitor, control panel, winch, measuring probe, and fish float depth sounding device, and draw a water level change trend chart over time based on the real-time water level;

[0013] (2) judging the speed or size of water inflow based on the water level change trend diagram drawn in step (1) and the spatial structure of the mine, and calculating the water inflow;

[0014] (3) The number of pumps is adjusted based on the amount of water inflow to maintain a basically stable water level.

[0015] Preferably, the formula for calculating the water inflow in step (2) is:

[0016] Qy=(Q 1b ΔT 1 +Q 2b ΔT 2 +·····Q nb ΔT n ) / (ΔT 抽 +ΔT 恢 )

[0017] Among them, Q 1b is the pumping capacity of the first pump, ΔT 1 is the pumping time of the first pump, Q 2b is the pumping capacity of the second pump, ΔT 2 is the pumping time of the second pump, ·····Q nb is the pumping capacity of the Nth pump, ΔT n is the pumping time of the Nth pump, ΔT 抽 is the total time from pump on to pump off, ΔT 恢 is the recovery time of water level from low water level to high water level, and Qy is the water inflow.

[0018] Preferably, the formula for calculating the water inflow in step (2) is:

[0019] Qy=V*H

[0020] Among them, V is the volume of the auxiliary shaft with a height of one meter, H is the height of the water level rise per hour, and Qy is the water inflow.

[0021] Compared with the prior art, the present invention has the following advantages: the present invention can detect the water level in real time through a monitor, a control panel, a winch and a measuring probe, record the water level change, and provide a data source for drawing a water level time change trend graph;

[0022] A fish float depth measuring device is installed at the front end of the lens of the measuring probe, so that the camera no longer touches the water surface, so that the water level depth measurement and video monitoring do not interfere with each other, greatly reducing the number of times the camera needs to be lifted up for cleaning, and improving work efficiency and monitoring continuity;

[0023] Combined with the water level trend chart and the spatial structure of the mine, through qualitative and quantitative evaluation of the mine water inrush volume, the mine water inrush situation and emergency water blocking effect can be predicted in advance, providing assistance for the advance arrangement of various coal mine tasks. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of an underground emergency water level monitoring system of the present invention;

[0025] Figure 2(a) is a water level variation trend diagram;

[0026] Figure 2(b) is a water level trend diagram;

[0027] Figure 2(c) is a water level trend diagram;

[0028] Figure 2(d) is a water level trend diagram;

[0029] Figure 2(e) is a water level trend diagram;

[0030] Figure 3 Schematic diagram of the shaft and tunnel of method one;

[0031] Figure 4 Method 1: Schematic diagram of water inrush volume change;

[0032] Figure 5 Schematic diagram of the shaft and tunnel for method 2.

[0033] Reference numerals in the figure: monitor 1, control panel 2, winch 3, cable 31, measuring probe 4, fishing float depth sounding device 5, fishing line 51, fishing float 52, lead block 53, auxiliary shaft 6, tunnel 7, inclined tunnel 8. DETAILED DESCRIPTION

[0034] The following is a detailed description of an embodiment of the present invention. This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiment.

[0035] like Figure 1As shown, the present embodiment is an underground emergency water level monitoring system, comprising a monitor 1 placed at the well site, a control panel 2, a winch 3 wrapped with a cable 31, and a measuring probe 4 placed underground; the measuring probe 4 is connected to the control panel 2 via the cable 31, the monitor 1 is connected to the control panel 2, the water surface depth is judged by the picture taken by the camera of the measuring probe 2 and the change of the splash on the water surface when the measuring probe 4 touches the water, and the picture is transmitted to the control panel 2 for processing, and the underground picture is displayed on the display 1.

[0036] This embodiment also includes a fishing float depth measuring device 5 , which is placed in front of the lens of the measuring probe 4 and connected to the measuring probe 4 .

[0037] The fishing float depth measuring device 5 includes a fishing line 51, a fishing float 52, and a lead weight 53; the fishing float 52 is pretended to be in front of the lens of the measuring probe 4 through the fishing line 51, and the lead weight 53 is connected to the bottom of the fishing float 52. Specifically, a brightly colored fishing float 52 (fish float) is installed 400mm in front of the camera of the measuring probe 4 with the fishing line 51, and a lead weight 53 is hung on the bottom of the fishing float 52 10mm away from the lowest point. After the fishing float 52 touches the water, it gradually changes from a vertical state to a horizontal state until the entire fishing float 52 lies horizontally on the water surface. The whole process is clearly displayed on the monitoring display 1, and the transition time from the vertical state to the horizontal state after the fishing float 52 touches the water is sufficient, so that the fishing float 52 can be used to track the rise and fall of the water level and record the water level depth;

[0038] The setting of the fish float depth measuring device 5 can measure the water level by observing whether the fish float 52 is in a horizontal state on the water surface without affecting the original camera function, and the camera no longer contacts the water surface, so that a large amount of oil floating on the water surface can be avoided from easily covering the camera glass, making the image blurred and affecting video monitoring, reducing the number of times the camera is lifted up for cleaning, and can avoid a large number of road logs floating on the water surface from damaging the camera; the water level depth measurement and video monitoring do not interfere with each other, greatly reducing the number of times the camera is lifted up for cleaning, and improving work efficiency and monitoring continuity.

[0039] Preferably, the measuring probe is a SYKJ-18 downhole video logging instrument.

[0040] The cable 31 is manually counted, and the manual marking count is performed every one meter in the cable 31, so that the depth can be measured directly from the cable 31 accurately.

[0041] Timely plotting of a large amount of water level monitoring data into a graphical water level change trend chart is conducive to our long-term, continuous and intuitive research on water level changes, and is conducive to judging the changes in mine water inrush based on the water level change trend chart, and can also make qualitative and quantitative evaluations of the amount of mine water inrush.

[0042] Figure 2(a)-Figure 2(e)This is a partial water level change trend chart. According to the trend in the chart, the underground water potential can be analyzed. The horizontal axis in the chart is time, 1 hour / grid, and the vertical axis is depth. The depth increases from top to bottom, 1 meter / grid;

[0043] According to the actual use status, the analysis is as follows: For Figure 2 (a), the water level change trend chart from May 28 to June 9 (vertical axis depth range 514-540m), shows the mine water level change trend chart without human intervention. The water level rises naturally, and the mine water level rises from 544 meters (below the wellhead, the same below) to 513 meters. The several horizontal sections in the figure are large tunnels or goafs under the mine filling well. The rest of the part keeps rising at a rough slope, which can reflect and predict the speed of mine water inrush from one side;

[0044] As for Figure 2(b), the water level change trend diagram from June 10 to June 22 (vertical axis depth range 508-527m), from June 10, artificial intervention in the water inrush process, namely pumping, began. The water level dropped during pumping, and recovered after the pump was stopped. From the slope of the water level recovery curve after the two pump stops, the two were basically the same. This means that the water level recovery speed is basically the same, which reflects from one side that the effect of underground water blocking had not yet appeared at that time. Since then, the water pump has been maintained to keep the water level basically stable.

[0045] Figure 2(c) is a water level variation trend chart from June 23 to July 5 (depth range on the vertical axis: 508-527, 527-541m). Strong pumping began at 6:00 on June 29, causing the water level to drop linearly from 509m to 563m on July 8 as shown in Figure 2(d).

[0046] Observe Figure 2(d), the water level change trend diagram from July 6 to July 18 (vertical axis depth range 541-560m), and Figure 2(e), the water level change trend diagram from July 19 to July 31 (vertical axis depth range 541-560m). By adjusting the number of running water pumps, the water level has been kept basically stable. During this process, underground water plugging work has been ongoing. When the water level remains basically stable, the amount of water outflow from the mine can also be qualitatively judged by counting the pumping volume of the running water pumps.

[0047] On the other hand, there are three obvious concave curves in Figure 2(e), all of which are caused by pumping. Analysis of these three concave curves clearly shows that the time it takes for the water level to return to the same position after the pump is stopped is getting longer from left to right, indicating that the amount of water inflow in the mine is decreasing. It also indirectly reflects that water blocking has taken effect. Water blocking refers to blocking the water inflow underground.

[0048] It can be seen that the water gushing and water blockage conditions in the mine can be learned from the analysis of the water level trend chart.

[0049] Furthermore, the present invention also provides a method for monitoring using the underground emergency water level monitoring system, and the specific steps are as follows:

[0050] (1) Arrange the monitor 1, control panel 2, winch 3, measuring probe 4, and fish float depth measuring device 5, and draw a water level change trend graph over time according to the real-time water level;

[0051] (2) judging the speed or size of water inflow based on the water level change trend diagram drawn in step (1) and the spatial structure of the mine, and calculating the water inflow;

[0052] (3) The number of pumps is adjusted based on the amount of water inflow to maintain a basically stable water level.

[0053] For the calculation of water volume, two calculation methods are given here:

[0054] Method 1: Calculate the water inflow by pumping. The quantitative evaluation of water inrush can effectively determine the water blocking effect of the emergency water blocking project in the later stage. Method 1 combines the three parameters of water pumping volume, pumping time, and water level recovery time after pumping is stopped to calculate the water inrush. The method is simple and convenient.

[0055] Its principle, combined with Figure 3 As shown in (schematic diagram of the connection between the auxiliary shaft and the tunnel, the spatial layout of the goaf etc. is not drawn), when the water level changes from A to B, the water in all the spaces between the A and B elevations will be drained, and when the water level returns from B to A, all the spaces between the A and B elevations will be filled with water again, no matter how large the volume of this space is, the two are equal.

[0056] Assume that when the water level in the auxiliary shaft reaches position A, the pump starts pumping water (assuming that only one pump is turned on), and the pump start time is T1. After a period of time, the water level drops to position B, and the time at this time is T2. After stopping the pump, the water level will slowly rise. Assuming that after a period of time, the water level returns to position A, the time at this time is T3.

[0057] The total pumping volume during the T1-T2 stage is: Q1b(T2-T1), and its value is equal to the mine water inflow Qy(T2-T1) during the period of T2-T1 and the total water storage volume between the water levels A and B. This water storage volume is equal to the total mine water inflow during the T2-T3 stage, which is Qy(T3-T2).

[0058] That is: Q1b(T2-T1)=Qy(T2-T1)+Qy(T3-T2)

[0059] Then the water inflow per hour is: Qy = Qb (T2-T1) / (T3-T1)

[0060] Among them, Q1b is the pumping capacity of the first pump, and Qy is the water inflow, both in cubic meters per hour.

[0061] It can be seen from the above formula that Qy is related to the pump volume and time, but has nothing to do with the water volume.

[0062] Then, for N pumps, the formula for calculating the water inflow from the time the pump is turned on to the stage when the water level returns to the original level after the pump is turned off is:

[0063] Qy=(Q 1b ΔT 1 +Q 2b ΔT 2 +·····Q nb ΔT n ) / (ΔT 抽 +ΔT 恢 )

[0064] Among them, Q 1b is the pumping capacity of the first pump, ΔT 1 is the pumping time of the first pump, Q 2b is the pumping capacity of the second pump, ΔT 2 is the pumping time of the second pump, ·····Q nb is the pumping capacity of the Nth pump, ΔT n is the pumping time of the Nth pump, ΔT 抽 is the total time from pump on to pump off, ΔT 恢 is the recovery time of water level from low water level to high water level, and Qy is the water inflow.

[0065] The above calculation method was used to calculate the water inflow (the hourly flow rate within a period of time).

[0066] For example, Figure 4 As shown in the figure, when the water level is at position A, pumping starts (one pump), and the water level is 550.89m at this time. The pump stops at position B (T2), and the water level is 558.21m, which takes about 12 hours. After that, the water level begins to recover slowly, and the water level reaches 550.89m at position A (T3), which takes about 26 hours. It is known that the pumping capacity of this pump is 700m 3 / h. Then the water inflow is:

[0067] Qy=Q1b(T2-T1) / (T3-T1)=700*12 / (12+26)=221.05m 3 / h

[0068] However, in the above calculation process, we always assume that the Qy value is constant. This is true when the water blocking effect is not apparent. However, in the later stage of water blocking, the water blocking effect gradually appears. During the 38-hour pumping and water level recovery process, the Qy value will definitely decrease gradually. In order to reduce this error, we do not have to stick to the change of water level from A to B, and can try to shorten the AB interval. Therefore, we use Figure 4 The ab section can minimize this error. The values ​​calculated using the ab section are as follows: We take the a water level value of 551.05m. When the pump is stopped, the b water level is 558.21m, which takes 8 hours. After the pump is stopped, the water level returns to 551.05m, which takes 18 hours. It is known that the pumping capacity of this pump is 700m 3 / h. Then:

[0069] Qy=Q1b(T2-T1) / (T3-T1)=700*8 / (8+18)=215.38m 3 / h

[0070] It can be seen that shortening the AB value can effectively reduce the calculation error.

[0071] Method 2: When the water level is always below the tunnel, the total water inflow can be calculated using the wellbore volume;

[0072] In the later stage of the water blocking project, the water level in the auxiliary shaft 6 can be lowered to a position below the main tunnel by continuous pumping of water by water pumps. Figure 5 As shown. Assuming that the water level is B when all the pumps stop pumping, the mine water will flow into the auxiliary shaft through the tunnel, causing the water level to gradually rise to A. Since the shaft circumference is fixed, it is easy to know the volume of a shaft with a height of one meter. The speed of water level rise can be accurately measured by the video logging instrument in the well.

[0073] Then, the formula for calculating the water inflow per hour is:

[0074] Qy=V*H

[0075] Among them, V is the volume of the auxiliary shaft with a height of one meter, H is the height of the water level rise per hour, the unit is meter, and Qy is the water inflow.

[0076] For example, the volume of each meter of the wellbore is about 80 cubic meters, and the water level rises by 0.70 meters per hour, so:

[0077] Qy==80*0.70=56m 3 / h

[0078] By establishing an underground emergency water level monitoring system, processing and analyzing the water level monitoring data of the auxiliary shaft mouth through the control panel 2, and being able to monitor the water level changes in real time from the monitor 1, the mine water inrush situation and the rescue and water blocking effect can be predicted in advance, providing assistance for arranging various tasks in advance, which is indispensable for water inrush rescue projects and has great economic and practical value.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An underground emergency water level monitoring system, characterized in that: The device comprises a monitor placed at the well site, a control panel, a winch wound with a cable, and a measuring probe placed in the well; the measuring probe is connected to the control panel through a cable, and the monitor is connected to the control panel; the cable is provided with an artificial mark; the device also comprises a fish float depth sounding device, which is placed in front of the lens of the measuring probe and connected to the measuring probe; the fish float depth sounding device comprises a fishing line, a fish float, and a lead block; the fish float is installed in front of the lens of the measuring probe through the fishing line, and the lead block is connected to the bottom of the fish float; the measuring probe is a SYKJ-18 type in-hole video logging instrument; The method of using the underground emergency water level monitoring system for monitoring is as follows: (1) Arrange the monitor, control panel, winch, measuring probe, and fish float depth sounding device, and draw a water level change trend chart over time based on the real-time water level; (2) judging the speed or size of water inflow based on the water level change trend diagram drawn in step (1) and the spatial structure of the mine, and calculating the water inflow; (3) By determining the amount of water inflow, the number of pumps is adjusted to maintain a basically stable water level; Among them, the first method for calculating the water inflow is to use pumping to calculate the water inflow, quantitatively evaluate the water inrush, and judge the water blocking effect in the later stage of the emergency water blocking project; the formula for calculating the water inflow in step (2) is: Qy=(Q 1b ΔT1+Q 2b ΔT2+·····Q nb ΔT n ) / (ΔT 抽 +ΔT 恢 ) Among them, Q 1b is the pumping capacity of the first pump, ΔT1 is the pumping time of the first pump, Q 2b is the pumping capacity of the second pump, ΔT2 is the pumping time of the second pump, ·····Q nb is the pumping capacity of the Nth pump, ΔT n is the pumping time of the Nth pump, ΔT 抽 is the total time from pump on to pump off, ΔT 恢 is the recovery time of water level from low water level to high water level, Qy is the water inflow; or, Method 2 for calculating water inflow: When the water level is always below the tunnel, the total water inflow is calculated using the shaft volume; the formula for calculating water inflow in step (2) is: Qy=V*H Among them, V is the volume of the auxiliary shaft with a height of one meter, H is the height of the water level rise per hour, and Qy is the water inflow.

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