CN112432727B - Early warning method for water inrush of bottom plate - Google Patents
Early warning method for water inrush of bottom plate Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
- G01L11/02—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by optical means
- G01L11/025—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by optical means using a pressure-sensitive optical fibre
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/18—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge using photoelastic elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/14—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measurement of pressure
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Abstract
The invention relates to the technical field of prediction of water inrush from a coal seam floor, and provides a floor water inrush early warning method, which comprises the following steps: collecting monitoring area data to obtain relevant numerical information; arranging optical fibers, and arranging the horizontal sections of the optical fibers along the top surface of the austenite water guiding and lifting belt; determining the initial thickness and the initial water pressure value of the water-resisting layer at any position of the horizontal section of the optical fiber; obtaining water pressure variable data of any point of the horizontal section of the optical fiber and the real-time height of the mining and lifting of the Aohui water in real time through the optical fiber, and obtaining a real-time water pressure value through the water pressure variable data and a water pressure initial value; obtaining the actual thickness of the water-resisting layer through the initial thickness of the water-resisting layer and the mining and lifting real-time height of the Ordovician ash water, and obtaining a water pressure real-time value through the real-time water pressure value and the mining and lifting real-time height of the Ordovician ash water; and monitoring the actual thickness of the water-resisting layer and the real-time value of the water pressure in real time to perform early warning. The method can position the water inrush point in the monitoring range, send out early warning in advance, and provide data support for coal mine safety production.
Description
Technical Field
The invention relates to the technical field of prediction of water inrush from a coal seam floor, in particular to a floor water inrush early warning method.
Background
The coal seam floor water inrush problem makes water prevention and control work face huge challenges due to concealment and burstiness, and water inrush monitoring and early warning are necessary measures for coal mine safety production. The method for monitoring and early warning the water inrush of the coal seam floor, which is applied to coal mines at present, mainly adopts the method of arranging monitoring sensors in a roadway to obtain the change information of parameters such as the water temperature, the water pressure, the strain and the like of the floor in the working face stoping process, and performs water inrush early warning according to the result after data processing.
Disclosure of Invention
The invention provides a floor water inrush early warning method which is used for solving the problem that the early warning effect of coal seam floor water inrush in the prior art is not ideal.
The invention provides a floor water inrush early warning method, which comprises the following steps:
collecting data of a monitoring area, and analyzing geological and hydrogeological conditions of the monitoring area to obtain relevant numerical information;
arranging optical fibers in the monitoring area, and arranging the horizontal sections of the optical fibers along the top surface of the Olympic water lifting guide belt;
determining the initial thickness N of the water-resisting layer at any point of the horizontal section of the optical fiber 0 With an initial value P of water pressure 0 ；
Obtaining the hydraulic pressure variable data delta P of any point of the horizontal section of the optical fiber and the mining and lifting real-time height h of the Aohu water through the optical fiber in real time 3 Passing the water pressure variable data Delta P and the initial water pressure value P 0 Obtaining a real-time water pressure value P 1 ；
Through the initial thickness N of the water barrier layer 0 And the real-time height h of the mining and lifting of the Ordovician ash water 3 Obtaining the actual thickness N of the water-resisting layer, and passing the real-time water pressure value P 1 And the real-time height h of the mining and lifting of the Ordovician ash water 3 Obtaining a water pressure real-time value P;
and monitoring the actual thickness N of the water-resisting layer and the real-time water pressure value P in real time to perform early warning.
According to the floor water inrush early warning method provided by the invention, the arrangement of the optical fiber in the monitoring area and the arrangement of the horizontal section of the optical fiber along the top surface of the Ordovician grey water guide lifting belt comprises the following steps:
and constructing a horizontal drilling hole at the bottom of a water-resisting layer of the coal seam floor by adopting a ground directional drilling hole, respectively forming a fixed point optical cable and a strain sensing distributed optical cable through the optical fiber, and implanting the fixed point optical cable and the strain sensing distributed optical cable into the horizontal drilling hole from the ground position.
According to the floor water inrush early warning method provided by the invention, the horizontal drilling hole forms the optical fiber sensing monitoring drilling hole through grouting and hole sealing.
According to the floor water inrush early warning method provided by the invention, the related numerical information comprises the AoHui water level elevation H 1 Coal seam floor level H 2 Top surface level H of Olympic Grey 3 Coal seam floor failure depth h 1 Ordovician ash water guide lift of coal seam floorInitial height h 2 。
According to the floor water inrush early warning method provided by the invention, the initial thickness N of the waterproof layer 0 Obtained by the following formula:
M＝H 2 -H 3 formula 1;
N 0 ＝M-h 1 -h 2 and (3) formula 2.
According to the floor water inrush early warning method provided by the invention, the initial water pressure value P 0 Obtained by the following formula:
P 0 ＝(H 1 -H 3 -h 2 ) /(102 m/MPa) formula 3.
According to the floor water inrush early warning method provided by the invention, the water pressure variable data delta P of any point of the horizontal section of the optical fiber and the real-time height h of the mining and lifting guidance of the Aohui water are obtained in real time through the optical fiber 3 According to the water pressure variable data Delta P and the water pressure initial value P 0 Obtaining a real-time water pressure value P 1 The method comprises the following steps:
respectively connecting the optical fiber with a strain demodulator and a perturbation dynamic detector;
the strain demodulator collects the spectral information of Brillouin scattering light at any point of the horizontal section of the optical fiber, the strain data is analyzed to obtain water pressure variable data delta P, and a real-time water pressure value P is obtained through the following formula 1 ：
P 1 ＝P 0 B, formula 4;
the perturbation dynamic sensing instrument collects phase information of high-coherence Rayleigh back scattering light at any point of the horizontal section of the optical fiber, demodulates the phase information, reconstructs a perturbation field around the horizontal section of the optical fiber, and obtains an Australian water mining and lifting height h 3 。
According to the floor water inrush early warning method provided by the invention, the actual thickness N of the waterproof layer is obtained through the following formula:
N＝N 0 -h 3 formula 5;
the hydraulic real-time value P is obtained by the following equation:
P＝P 1 -h 3 /(102 m/MPa) formula 6.
According to the floor water inrush early warning method provided by the invention, the monitoring the actual thickness N of the waterproof layer and the real-time water pressure value P in real time for early warning comprises the following steps:
obtaining the actual thickness N of the water-resisting layer and the real-time water pressure value P of each positioning point on the top surface of the orexin water mining lifting belt corresponding to each point of the horizontal section of the optical fiber in real time, calculating the real-time water inrush coefficient value T of each positioning point, taking the real-time water inrush coefficient value T as an early warning reference, and obtaining the real-time water inrush coefficient value T through the following formula:
t = P/N formula 7.
According to the floor water inrush early warning method provided by the invention, the monitoring the actual thickness N of the waterproof layer and the real-time water pressure value P in real time for early warning comprises the following steps:
and obtaining a real-time water inrush curve graph through the real-time water inrush coefficient values T of the positioning points on the top surface of the oregano water mining lifting belt corresponding to the points of the horizontal section of the optical fiber and the positions corresponding to the real-time water inrush coefficient values, identifying an evaluation critical line, and respectively identifying a broken line area above the evaluation critical line and a broken line area below the evaluation critical line.
According to the early warning method for water inrush of the bottom plate, the data of the top surface position of the Ordovician water mining lifting guide belt are acquired through the optical fibers, so that the actual thickness N and the real-time water pressure value P of the waterproof layer are obtained, and data support is provided for early warning of water inrush of the bottom plate.
The invention utilizes the advantages of explosion prevention, flame prevention, corrosion resistance, electromagnetic interference resistance, rapid real-time distributed strain, positioning and the like of the optical fiber sensing technology, directionally drills and buries optical fibers in the construction ground, calculates and positions the water inrush point of the coal seam floor by adopting a water inrush coefficient method according to a real-time monitoring value, and realizes all-weather monitoring and early warning.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of an optical fiber arrangement structure in a floor water inrush warning method according to the present invention;
FIG. 2 is a schematic diagram showing values of various parameters in the early warning method for water inrush from a base plate according to the present invention;
FIG. 3 is a schematic cross-sectional view of a water inrush section of a floor of a coal face of a section where the floor is structurally damaged in the floor water inrush warning method of the present invention;
FIG. 4 is a schematic sectional view of a water inrush section of a section coal face floor with a water barrier intact and without fracture tectonic damage.
Reference numerals are as follows:
1. directional drilling on the ground; 2: horizontally drilling; 3: the direction of recovery;
4: a width-mining central point; 5: cutting eyes; 6: a coal seam is planned to be mined;
7: an aqueous layer of Ordovician limestone; 8: an austenite water lifting guide belt; 9: an Aohui water mining lifting guide belt;
10: a gob; 11: a bottom plate disturbance damage area; 12: a horizontal segment of optical fiber;
13: an austenite water line; 14: evaluating the critical line; 15: water inrush coefficient curve;
16: a water inrush safety zone; 17: water inrush hazard zone.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.
In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Fig. 1 to fig. 4 are combined to describe a floor water inrush early warning method according to an embodiment of the present invention, where fig. 1 provides a schematic diagram of an optical fiber layout structure that can be applied to the floor water inrush early warning method according to the present invention, fig. 2 provides a schematic diagram of values of various parameters, fig. 3 is a schematic diagram of a section of a floor water inrush section of a coal face of a section where a floor is structurally damaged, and fig. 4 is a schematic diagram of a section of a floor water inrush section of a section where a water barrier is intact and has no fracture structural damage.
In one embodiment of the invention, the early warning method for water inrush of the soleplate comprises the following steps:
s100, collecting data of the monitoring area, and analyzing geological and hydrogeological conditions of the monitoring area to obtain relevant numerical information.
Wherein the monitored area data comprises: three-dimensional earthquake, underground geophysical prospecting, coal seam floor damage research reports, hydrogeological drilling and aquifer observation water level statistics in the last 3 years of the monitored area.
Wherein the related numerical information comprises the Aogrey water level elevation H 1 Coal seam floor elevation H 2 AoHui top surface elevation H 3 Coal seam floor failure depth h 1 The initial height h of the Aohu water guide of the coal bed bottom plate 2 And the like. The relevant numerical information can provide data support for early warning of water inrush of the soleplate.
Referring to FIG. 2, the height H of the Aohu water level 1 The height of the bottom plate of the coal seam is H, which is the height of the Aohu water line 13 in the figure 2 The height of the top surface of the Ordovician limestone is the height of the bottom of the coal seam 6 to be mined 3 The height of the top surface of the Ordovician aquifer 7 and the failure depth h of the coal seam floor 1 The height from the bottom surface of a floor disturbance damage area 11 formed below a goaf 10 of the coal seam to the bottom of a coal seam 6 to be mined, and the initial height h of the Ordovician ash water of the floor of the coal seam 2 The height from the top surface of the ordovician ash lifting belt 8 to the top surface of the ordovician ash aquifer 7.
S200, arranging optical fibers in the monitoring area, and arranging the horizontal sections 12 of the optical fibers along the top surface of the Ordovician water lifting guide belt 8.
Referring back to fig. 1, a horizontal borehole 2 at the bottom of the water barrier of the coal seam floor is constructed by using a ground directional borehole 1, and the horizontal borehole 2 is located at the top of an austenite water lifting guide belt 8. The ground directional drilling 1 is positioned with a sampling width center point 4 in front of the extraction face in the extraction direction 3, whose distance from the cutting opening 5 depends on the monitoring area. The horizontal bore 2 extends along the top surface of the ballast water lifting belt 8.
And respectively forming a fixed point optical cable and a strain sensing distributed optical cable through optical fibers, and implanting the fixed point optical cable and the strain sensing distributed optical cable into the horizontal drilling hole 2 from the ground position. The fixed point optical cable and the strain sensing distributed optical cable can be bundled into one strand, and a protective layer is arranged outside the fixed point optical cable and the strain sensing distributed optical cable, so that the fixed point optical cable and the strain sensing distributed optical cable can be implanted into the same drill hole at one time, and the fixed point optical cable and the strain sensing distributed optical cable have good tensile and shear resistance. The fixed point optical cable is used for measuring downhole micro-disturbance, and the strain sensing distributed optical cable can be used for measuring downhole water pressure. The fixed-point optical cable and the strain sensing distributed optical cable can be used as a data transmission channel and a sensing device, and the distributed measurement of the mechanical state of each point in the drill hole is realized.
After the fixed-point optical cable and the strain sensing distributed optical cable are implanted into the drill hole, the horizontal drill hole 2 is tightly coupled with the surrounding rock of the drill hole through grouting and hole sealing to form an optical fiber sensing monitoring drill hole.
S300, determining the initial thickness N of the water-resisting layer at any point position of the optical fiber horizontal section 12 0 With an initial value P of water pressure 0 。
Initial thickness N of water barrier layer 0 Obtained by the following formula:
M＝H 2 -H 3 formula 1;
N 0 ＝M-h 1 -h 2 and (3) formula 2.
Initial value P of water pressure 0 Obtained by the following formula:
P 0 ＝(H 1 -H 3 -h 2 ) /(102 m/MPa) formula 3.
S400, obtaining water pressure variable data delta P of any point of the optical fiber horizontal section 12 and real-time height h of Aurea ash water mining and leading in real time through optical fibers 3 By hydraulic pressure variable numberAccording to the delta P and the initial value P of the water pressure 0 Obtaining a real-time water pressure value P 1 。
One end of an optical fiber of the strain sensing distributed optical cable, which is positioned on the ground, is connected with a strain demodulator, the strain demodulator collects the spectral information of Brillouin scattered light at any point of the horizontal segment 12 of the optical fiber, water pressure variable data delta P is obtained by analyzing and processing strain data, and a real-time water pressure value P is obtained by the following formula 1 ：
P 1 ＝P 0 B, formula 4;
one end of the optical fiber of the fixed-point optical cable, which is positioned on the ground, is connected with a perturbation dynamic sensing instrument, the perturbation dynamic sensing instrument collects and demodulates the phase information of high-coherence Rayleigh back scattering light at any point of the optical fiber at the horizontal section, and a perturbation dynamic field around the optical fiber at the horizontal section is reconstructed to obtain the raising height h of the Aohu water collection 3 。
S500, passing through the initial thickness N of the water-resisting layer 0 Real-time height h for mining and lifting Olympic Grey Water 3 Obtaining the actual thickness N of the water-resisting layer through the real-time water pressure value P 1 Real-time height h for mining and lifting Olympic Grey Water 3 A water pressure real-time value P is obtained.
The actual thickness N of the water barrier layer is obtained by the following formula:
N＝N 0 -h 3 formula 5;
the hydraulic real-time value P is obtained by the following equation:
P＝P 1 -h 3 /(102 m/MPa) formula 6.
The actual thickness N and the real-time water pressure value P of the water-resisting layer can reflect the water inrush problem of the coal seam floor, provide data reference for water prevention and control work, find problems in time and give early warning.
S600, monitoring the actual thickness N of the water-resisting layer and the water pressure real-time value P in real time to perform early warning.
Specifically, the actual thickness N of the water-resisting layer and the real-time water pressure value P of each positioning point on the top surface of the orexin water mining lifting belt corresponding to each point of the horizontal segment 12 of the optical fiber are obtained in real time, the real-time water inrush coefficient value T of each positioning point is calculated, the real-time water inrush coefficient value T is used as an early warning reference, and the real-time water inrush coefficient value T is obtained through the following formula:
t = P/N formula 7.
Further, with reference to fig. 3 and 4, a real-time water inrush curve graph is obtained through the real-time water inrush coefficient values T of the positioning points on the top surface of the oregano water mining lifting belt corresponding to the points of the horizontal section 12 of the optical fiber and the positions corresponding to the real-time water inrush coefficient values T, the evaluation critical line 14 is identified, and a broken line region above the evaluation critical line 14 and a broken line region below the evaluation critical line 14 are identified respectively. The water inrush coefficient of the structural damage section of the bottom plate is generally not more than 0.06MPa/m, and the structural damage section with a complete and non-fracture waterproof layer is not more than 0.1MPa/m. FIG. 3 is a schematic sectional view of a water inrush section of a floor of a coal face in a zone in which the floor is structurally damaged, and an evaluation critical line 14 indicated by a broken line in FIG. 3 is located at a position of 0.06 MPa/m. Fig. 4 is a schematic sectional view of a water inrush section of a floor of a coal face of a section in which a water barrier is intact without fracture structural damage, and an evaluation critical line 14 indicated by a broken line in fig. 4 is located at a position of 0.1MPa/m. In fig. 3 and 4, real-time water inrush coefficients obtained from positioning points on the top surface of the oregano water mining lifting guide belt corresponding to points at the horizontal segment 12 of the embedded optical fiber form a real-time water inrush coefficient curve, the part of the real-time water inrush coefficient curve below the evaluation critical line 14 is a water inrush safety zone 16, and the part of the real-time water inrush coefficient curve above the evaluation critical line 14 is a water inrush danger zone 17. The water inrush safety zone 16 and the water inrush danger zone 17 are marked by means of section lines, colors and the like, and the performance is more intuitive.
According to the floor water inrush early warning method provided by the embodiment of the invention, the Brillouin distributed optical fiber sensing technology (BOTDR) is utilized, the water pressure borne by any point of the upper horizontal section of the optical fiber implanted at the bottom of the water-resisting layer of the coal seam floor and the mining and lifting height of the Ordovician grey water are calculated through a strain and phase meter, the water inrush point in the monitoring range is positioned by adopting a water inrush coefficient method, early warning is given out in advance, and data support is provided for coal mine safety production.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (2)
1. A floor water inrush early warning method is characterized by comprising the following steps:
collecting data of a monitoring area, and analyzing geological and hydrogeological conditions of the monitoring area to obtain related numerical information;
arranging optical fibers in the monitoring area, and arranging the optical fiber horizontal section of each optical fiber along the top surface of the Ordovician grey water guiding and lifting belt, wherein the arranging of the optical fibers in the monitoring area, and the arranging of the optical fiber horizontal section of each optical fiber along the top surface of the Ordovician grey water guiding and lifting belt comprises the following steps: constructing a horizontal drilling hole at the bottom of a water-resisting layer of a coal seam floor by adopting a ground directional drilling hole, respectively forming a fixed point optical cable and a strain sensing distributed optical cable through the optical fibers, implanting the fixed point optical cable and the strain sensing distributed optical cable into the horizontal drilling hole from the ground position, binding the fixed point optical cable and the strain sensing distributed optical cable into one strand, arranging a protective layer outside, and implanting the fixed point optical cable and the strain sensing distributed optical cable into the same drilling hole at one time;
determining the initial thickness N of the water-resisting layer at any point of the horizontal section of the optical fiber 0 With an initial value P of water pressure 0 ；
Obtaining the hydraulic pressure variable data delta P of any point of the horizontal section of the optical fiber and the mining and lifting real-time height h of the Aohu water through the optical fiber in real time 3 According to the water pressure variable data Delta P and the water pressure initial value P 0 Obtaining a real-time water pressure value P 1 ；
Through the initial thickness N of the water barrier 0 And the real-time height h of the mining and lifting of the Ordovician ash water 3 Obtaining the actual thickness N of the water-resisting layer, and passing the real-time water pressure value P 1 And the real-time height h of the mining and lifting of the Ordovician ash water 3 Obtaining a hydraulic real-time value P;
monitoring the actual thickness N of the water-resisting layer and the real-time water pressure value P in real time to perform early warning, wherein the real-time monitoring of the actual thickness N of the water-resisting layer and the real-time water pressure value P in real time includes the following steps: obtaining a real-time water inrush curve graph through the real-time water inrush coefficient values T of positioning points on the top surface of the oregano water mining lifting guide belt corresponding to the points of the horizontal section of the optical fiber and the positions corresponding to the real-time water inrush coefficient values, identifying evaluation critical lines, and respectively identifying a broken line area above the evaluation critical lines and a broken line area below the evaluation critical lines;
the horizontal drilling hole forms an optical fiber sensing monitoring drilling hole through grouting hole sealing;
the related numerical information comprises the height H of the Ordovician limestone water level 1 Coal seam floor level H 2 Top surface level H of Olympic Grey 3 Coal seam floor failure depth h 1 Initial height h of guided rising of Ordovician ash water of coal bed floor 2 ；
Initial thickness N of the water-resisting layer 0 Obtained by the following formula:
M＝H 2 -H 3 formula 1;
N 0 ＝M-h 1 -h 2 formula 2;
the initial value P of water pressure 0 Obtained by the following formula:
P 0 ＝(H 1 -H 3 -h 2 ) /(102 m/MPa) formula 3;
the hydraulic pressure variable data delta P of any point of the horizontal section of the optical fiber and the real-time height h of the mining and leading of the Aohui water are obtained in real time through the optical fiber 3 According to the water pressure variable data Delta P and the water pressure initial value P 0 Obtaining a real-time water pressure value P 1 The method comprises the following steps:
respectively connecting the optical fiber with a strain demodulator and a perturbation dynamic detector;
the strain demodulator collects the spectral information of Brillouin scattering light at any point of the horizontal section of the optical fiber, the strain data is analyzed to obtain water pressure variable data delta P, and a real-time water pressure value P is obtained through the following formula 1 ：
P 1 ＝P 0 B, formula 4;
the perturbation dynamic sensing instrument collects high-coherence Rayleigh back at any point of optical fiber at horizontal sectionDemodulating the phase information of the scattered light, reconstructing a perturbation field around the horizontal section of optical fiber to obtain the mining elevation height h of the Ordovician grey water 3 ；
The actual thickness N of the water-resisting layer is obtained by the following formula:
N＝N 0 -h 3 formula 5;
the hydraulic real-time value P is obtained by the following equation:
P＝P 1 -h 3 /(102 m/MPa) formula 6.
2. The floor water inrush pre-warning method according to claim 1, wherein the monitoring the actual thickness N of the water-barrier layer and the real-time hydrostatic value P in real time for pre-warning comprises:
obtaining the actual thickness N of the water-resisting layer and the real-time water pressure value P of each positioning point on the top surface of the orexin water mining lifting belt corresponding to each point of the horizontal section of the optical fiber in real time, calculating the real-time water inrush coefficient value T of each positioning point, taking the real-time water inrush coefficient value T as an early warning reference, and obtaining the real-time water inrush coefficient value T through the following formula:
t = P/N formula 7.
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