CN111894588B - Grouting treatment method for coal seam roof ultra-thick water-containing layer area - Google Patents
Grouting treatment method for coal seam roof ultra-thick water-containing layer area Download PDFInfo
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- CN111894588B CN111894588B CN202010826411.1A CN202010826411A CN111894588B CN 111894588 B CN111894588 B CN 111894588B CN 202010826411 A CN202010826411 A CN 202010826411A CN 111894588 B CN111894588 B CN 111894588B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/16—Receiving elements for seismic signals; Arrangements or adaptations of receiving elements
- G01V1/18—Receiving elements, e.g. seismometer, geophone or torque detectors, for localised single point measurements
- G01V1/181—Geophones
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/28—Processing seismic data, e.g. analysis, for interpretation, for correction
Abstract
The invention provides a grouting treatment method for a coal seam roof huge-thickness water-containing layer area, which comprises the following steps: the first stage is as follows: before mining, carrying out sedimentary facies analysis, selecting a river flood beach facies stratum as a target layer, and selecting a strong-permeability aquifer as the target layer if the river flood beach facies water-resisting layer does not exist; and a second stage: exploring and positioning a permeable skylight on a target layer of the flood plain, grouting and compensating the permeable skylight, or grouting and transforming a strong-permeability aquifer into a water-resisting layer; and a third stage: monitoring the stability of an available water-resisting layer after the roof is transformed before mining; a fourth stage: and after mining, grouting the sliding seam generated on the coal pillar top plate to form a waterproof curtain. The invention makes up the skylight of the water-resisting layer by grouting before mining or transforms the water-resisting layer into the strong permeable water-resisting layer, and forms the water-resisting curtain by grouting the slip joint after mining, thereby achieving the purposes of reducing the thickness of the water-resisting layer and the water inflow of the mine, improving the underground operation environment, reducing the cost and restoring the normal production of the coal mine which is stopped producing.
Description
Technical Field
The invention relates to the technical field of coal mine water damage treatment, in particular to a grouting treatment method for a coal seam roof huge-thickness water-containing layer area.
Background
In Shaanxi, inner Mongolia and Shandong of China, a lot of coal mines have serious water inrush disasters, a huge and thick aquifer of a roof causes a plurality of water damages, and great life and property losses are caused, the produced huge water inflow greatly increases drainage cost and water treatment cost, large equipment is rapidly corroded, the service life is shortened, the production cost is greatly increased, and the water inrush is difficult to continue.
Meanwhile, the water burst caused by water damage also seriously worsens the working environment, the occupational health environment and the ground ecological environment, and seriously increases the production risk. Coal mines which are built with huge cost cannot be produced normally, and the danger of closing is faced. In order to control the water damage, experts of national coal mine water control scientific research institutions and teaching units adopt various control technologies including traditional grouting curtain technology, powder and chemical grouting materials, vertical and horizontal drilling grouting methods and the like, but the control technologies have little effect.
In the coal fields of North China and Ordos, the sandstone on the top plate of the coal bed is deposited by a river phase, and inevitably accords with the binary structures of coarse-grained clastic sediment of the river bed phase and fine-grained sediment of a flood beach. For massive river facies sedimentary rocks, there are multiple sedimentary revolutions, but this binary structure is always present. The river flood beach phase sediment has a water-resisting effect and is a good water-resisting layer, and therefore basis is provided for layering and thickening of a huge thick aquifer and reduction of water inflow of a mine.
In addition, after coal mining, roof overburden will collapse, forming sliding cracks at the edges of the coal pillars. In the slippage crack zone, the permeability coefficient of the aquifer is greatly increased, so that the originally non-groutable stratum becomes groutable, and the construction of a grouting curtain becomes possible. Finally, the purposes of reducing the mine water passing section and reducing the mine water inflow are achieved.
The invention finds the river flood beach deposition layer at the proper position by utilizing the principle, and performs grouting compensation on the permeable skylight in the layer to finally form a complete water-resisting layer, thereby achieving the purposes of reducing the thickness of the water-containing layer and the water inflow of the mine, improving the underground operation environment, reducing the production cost, recovering the normal production of the coal mine which is out of production, and leading the coal mine which faces to be closed to start to die and recover.
Disclosure of Invention
The invention aims to provide a grouting treatment method for a coal seam roof huge-thickness water-containing layer area, which can achieve the purposes of reducing the thickness of the water-containing layer and the water inflow of a mine, improving the underground operation environment, reducing the production cost, and restoring the production of a coal mine which is stopped to make the coal mine facing shutdown start to die and return to life.
The invention provides a grouting treatment method for a coal seam roof huge-thickness water-containing layer area, which comprises the following steps:
stage one: before mining, carrying out sedimentary facies analysis on the huge and thick aquifer of the roof, and selecting a river flood beach facies water-resisting layer as a target layer;
and a second stage: the method comprises the following steps of exploring and positioning a permeable skylight on a target layer, grouting and making up the target layer, and transforming the target layer into an available water-resisting layer, wherein the method specifically comprises the following steps:
step 20: carrying out seismic data reprocessing and interpretation on the target layer;
step 30: finding the position of the permeable skylight, and performing grouting transformation on the position of the permeable skylight to form an available water-resisting layer, so that the permeable skylight does not leak water any more, thereby dividing the water-bearing layer, reducing the thickness of the water-bearing layer and reducing the water inflow;
step 40: if no flood beach water-resisting layer exists, selecting a stronger water-bearing layer with the thickness of 3-10m above the water flowing fractured zone as a target layer for grouting transformation;
step 50: grouting the aquifer, and transforming the aquifer into a water-resisting layer so as to achieve the purposes of partitioning the aquifer and reducing the thickness of the aquifer;
and a third stage: monitoring the stability of the usable water barrier after the roof is reformed, wherein the stage specifically comprises the following steps:
step 60: embedding a microseismic detector and a tank wave detector in the water-resisting layer, and monitoring the damage condition of mining to the water-resisting layer;
step 70: burying a water pressure sensor for monitoring the stability of the water barrier in the water barrier determined in the step 30 or the water barrier modified in the step 50;
and a fourth stage: and after mining, grouting the sliding seam generated on the coal pillar top plate to form a waterproof curtain.
Further, the first stage specifically includes the following steps:
step 10: and drilling a huge thick aquifer of the top plate, carrying out sedimentary facies analysis, and searching a river flood beach facies stratum with the thickness of more than 3m above the water flowing fractured zone to be used as a target layer for layering and thickening reduction.
Further, the stage four specifically includes the following steps:
step 80: the position of a sliding seam above the coal pillar is determined in an auxiliary mode;
step 90: and (4) grouting in the water-resisting layer determined in the step (30) or the aquifer sliding seam below the water-resisting layer reconstructed in the step (50) to construct a water-resisting curtain.
Further, the method also comprises a stage five:
monitoring and analyzing the stability of a water-containing layer section of a water-proof curtain formed after slip joint grouting, and specifically comprising the following steps of:
step 100: embedding a microseismic detector and a tank wave detector in the compensated water-containing layer section in the slip joint grouting hole;
step 110: embedding a water pressure sensor for monitoring the stability of the water-resisting layer in the slip joint grouting hole above the water-resisting layer determined in the step 30 or the water-resisting layer reconstructed in the step 50;
step 120: after the coal seam is recovered, monitoring the microseismic detectors and the trough wave detectors installed in the steps 60 and 100, and if the monitoring result shows that the water-resisting layer is damaged by mining, further judging according to the water pressure sensor;
step 130: after the coal seam is recovered, monitoring the water pressure sensors installed in the step 70 and the step 110, drawing a water head contour map according to test data, and if the contour map is a low water head closed curve in a grouting area, determining the center of the closed curve to be the position of a funnel, namely an area where a water-resisting layer is damaged;
step 140: if the contour line drawn according to the monitored water head data is difficult to close and presents a low water head valley, the damage area of the water-resisting layer is determined in the low water head valley by referring to the microseism and the channel wave data.
Further, the method also comprises a sixth stage:
grouting and remedying the damaged area of the waterproof layer determined by monitoring, and specifically comprising the following steps:
step 150: and (3) performing supplementary grouting on the water-barrier damage area determined in the step 130 or the step 140 to repair the water-barrier until the funnel or the ground head valley disappears or is remarkably slowed down.
Further, the range of the waterproof curtain formed by slip joint grouting is required to be below the water-resisting layer compensated in step 30 or the water-resisting layer modified in step 50.
Further, the seismic data reprocessing and interpretation in the step 20 includes the following steps:
step 21: calibrating a geological horizon by using drilling data in the region, and determining the geological horizon of the reflected wave and the corresponding target layer reflected wave by comparing drilling time profiles;
step 22: continuously comparing and tracking the selected standard reflected wave as a main object according to the amplitude of the same phase axis of the reflected wave, the waveform, the wave group characteristics and the time difference characteristic, determining that the structure change and the breakpoint on the vertical section are the same phase axis dislocation, bifurcation, strong phase transfer, weakened amplitude and the like, determining that the fault or the phase change is generated, and determining the position of the permeable skylight;
step 23: the fluctuation form of the coal seam fold is explained by horizontal and bedding slices: the trend and the trend accurately determine the plane distribution rule of the fault or the permeable skylight through the discontinuity of the coherent slice;
step 24: and performing all-dimensional spatial homing on the three-dimensional data, establishing a spatial velocity field by using drilling data, performing time-depth conversion, and drawing a skylight distribution map and a fault distribution map of a target layer.
Compared with the prior art, the invention has the beneficial effects that:
on one hand, the method utilizes the good water-resisting performance of the river flood beach phase sediment before mining to find a river flood beach sediment layer at a proper position, and performs grouting compensation on permeable skylights in the layer to finally form a complete water-resisting layer, thereby achieving the purposes of reducing the thickness of the water-bearing layer and reducing the water inflow of a mine; on the other hand, after mining, a sliding seam is formed by the edge of the coal pillar, drilling and grouting are carried out, and a waterproof curtain is formed, so that the purposes of reducing the mine water passing section and reducing the mine water inflow are achieved. Meanwhile, the stability of the water-resisting layer is monitored and analyzed in real time by various sensor devices, the damage position caused by the mining process is determined, effective compensation is carried out, the safety and stability of the water-resisting layer and the water-resisting curtain are guaranteed, the water inflow of a mine can be greatly reduced, the underground operation environment is improved, the production cost is reduced, the production of a stopped coal mine is recovered to normal production, and the coal mine facing the shutdown is started to stop and recover.
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 other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of a grouting compensation project of a permeable skylight with a water-resisting layer according to the invention;
FIG. 2 is a schematic diagram of a regional grouting reconstruction project for a stronger aquifer to become a water barrier;
FIG. 3 is a schematic view of the present invention illustrating stability monitoring after the aquifer has been affected by mining;
FIG. 4 is a schematic diagram of the slip joint grouting project for forming a waterproof curtain.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In North China and Ordos coal fields, sandstone on the top plate of a coal bed is deposited in a river phase, and inevitably accords with the binary structure of coarse-grained clastic sediment of the river bed phase and fine-grained sediment of a flood beach. For a massive river facies sedimentary rock, there are multiple sedimentary revolutions, but this binary structure repeats. The river flood beach phase sediment has a water-resisting effect and is a good water-resisting layer, and therefore basis is provided for layering and thickening of a huge thick aquifer and reduction of water inflow of a mine. However, the river flood beach phase water-resisting layer is not stable enough, a permeable skylight exists, and the completeness can be realized only by grouting to make up the aquifer.
After coal mining, the roof cover rock will collapse, and a sliding crack is formed at the edge of the coal pillar. In the slippage seam tape, the permeability coefficient of the aquifer is greatly increased, so that the formation which is not grouted originally becomes groutable, and the construction of a grouting curtain becomes possible. Finally, the purposes of reducing the mine water passing section and reducing the mine water inflow are achieved.
In combination with the theory, the invention provides a grouting treatment method for a coal seam roof huge-thickness water-containing layer area, and the implementation of the method can be divided into the following stages:
(1) before mining
The first stage is as follows:
and (4) carrying out sedimentary facies analysis on the huge and thick aquifer of the top plate, and selecting a river flood beach water-resisting layer as a target layer.
Sedimentary gyratory analysis was first performed on the roof massive aquifer, since both sand and conglomerate aquifers are river phase sedimentary, and both massive sand and conglomerate aquifers contain multiple sedimentary gyrations. And then finding out a river flood beach phase stratum with larger thickness and more stable distribution in the stratum above the water flowing fractured zone. And finally, dividing the huge thick aquifer by taking the layer as a mark, and simultaneously taking the layer as a target layer for skylight exploration, compensation and waterproof layer monitoring.
The stage specifically comprises the following steps:
step 10: and drilling a huge thick aquifer of the top plate, carrying out sedimentary facies analysis, and searching a river flood beach-phase water-resisting layer with the thickness of more than 3m above the water flowing fractured zone to be used as a target layer for layering and thickening reduction.
And a second stage:
and (4) exploring and positioning the permeable skylight on the target layer, grouting and making up the permeable skylight, and transforming the permeable skylight into an available water-resisting layer.
Seismic data reprocessing and interpretation are carried out on the water-resisting layer selected in the first stage, and a water-permeable skylight of the water-resisting layer is found out preliminarily; and then, constructing a drill hole to perform grouting compensation on the permeable skylight, and modifying the skylight into a waterproof layer as shown in figure 1 so that the waterproof layer is complete. If the number of the permeable skylights is too large, and a strong aquifer with small thickness (generally larger than 3-10m) develops above the zone close to the water flowing fracture, the aquifer is grouted and is transformed into a water-resisting layer so as to achieve the purpose of segmenting the original huge thick aquifer, as shown in fig. 2.
The stage specifically comprises the following steps:
step 20: carrying out seismic data reprocessing and interpretation on the target layer;
the seismic data reprocessing and interpretation in step 20 may be further subdivided into steps 21-24:
step 21: calibrating a geological horizon by using drilling data in the region, and determining the geological horizon of the reflected wave and the corresponding target layer reflected wave by comparing drilling time profiles;
step 22: continuously comparing and tracking the selected standard reflected wave as a main object according to the amplitude of the same phase axis of the reflected wave, the waveform, the wave group characteristics and the time difference characteristic, determining that the structure change and the breakpoint on the vertical section are the same phase axis dislocation, bifurcation, strong phase transfer, weakened amplitude and the like, determining that the fault or the phase change is generated, and determining the position of the permeable skylight;
step 23: the fluctuation form, trend and tendency of the coal seam flexure are explained by utilizing horizontal and edge slices, and the plane distribution rule of a fault or a permeable skylight is accurately determined through the discontinuity of a coherent slice;
step 24: performing omnibearing spatial homing on the three-dimensional data, establishing a spatial velocity field by using drilling data, performing time-depth conversion, and drawing a skylight distribution map and a fault distribution map of a target layer;
step 30: finding the position of the permeable skylight, and performing grouting transformation on the position of the permeable skylight to form an available water-resisting layer, so that the permeable skylight does not leak water any more, thereby dividing the water-bearing layer, reducing the thickness of the water-bearing layer and reducing the water inflow;
step 40: if no water-resisting layer of the river flood beach phase exists at a proper position, selecting a stronger water-bearing layer with the thickness of 3-10m as a target layer for grouting transformation;
step 50: grouting the aquifer, and transforming the aquifer into a water-resisting layer, thereby achieving the purposes of partitioning the aquifer and reducing the thickness of the aquifer.
And a third stage:
and monitoring the stability of the water-proof layer after the top plate is transformed.
And in the third stage, the stability of the water-resisting layer is mainly detected by using a detector and a water pressure sensor which are embedded in the drilled hole. As shown in fig. 3, if the detector data prove that the height of the water-flowing fractured zone caused by mining reaches the water-resisting layer, the water-bearing layer is considered to be damaged in a determined region, and the position of a damaged area is determined according to the detector data of a plurality of drill holes; if the water pressure sensor data embedded into the drill hole obtains the data of water pressure drop, and the water-resisting layer is proved to be damaged or a water-permeable skylight which is not found exists, the position of a damaged area is determined according to a water head contour map drawn by a plurality of drill hole data.
When the aquifer water under the water barrier fills water into the mine, the aquifer water above the water barrier which is not damaged by mining must leak and supply to the downbearing aquifer through the skylight or the damaged area to form a landing funnel. And a plurality of water pressure sensors which are not drilled in a straight line obtain water head data, a water head contour map is drawn according to the data, and the minimum contour closed loop is the position of the water permeable skylight. And (5) grouting and making up the permeable skylight at the determined position in the subsequent stage.
The stage specifically comprises the following steps:
step 60: embedding a microseismic detector and a tank wave detector in the water-resisting layer, and monitoring the damage condition of mining to the water-resisting layer;
step 70: and (3) burying a water pressure sensor for monitoring the stability of the water barrier in the water barrier determined in the step 30 or the water barrier modified in the step 50.
(2) After mining
A fourth stage:
and after mining, grouting the sliding seam generated on the coal pillar top plate to form a waterproof curtain.
The slip seam refers to a boundary crack which is generated in a rock stratum above a coal pillar after an overlying rock stratum of a coal seam is damaged by mining. Because the existence of the sliding seam enables the aquifer which is not injectable originally to become injectable, the grouting of the ground area to form the curtain becomes possible. As shown in fig. 4, the concrete method is that a hole is drilled on the ground to the position of a water-bearing stratum sliding seam, then the hole is changed into a bedding hole along the sliding seam, grouting is carried out after the hole is changed to a preset position, and a waterproof curtain is formed. The sliding seams are developed along the coal pillars, and the sliding seams are as many as the coal pillars on the working face or the mining area. Grouting should be conducted in the sliding seam of the outermost coal pillar to achieve the best effect. The waterproof curtain has the function of reducing the area of the water passing section of the water-containing layer filled with water to the mine, so that the aim of reducing the water inflow of the mine is fulfilled.
The stage specifically comprises the following steps:
step 80: determining the position of a sliding seam above the coal pillar;
step 90: and (3) grouting in the part of the sliding joints of the aquifer below the water-resisting layer determined in the step 30 or the water-resisting layer reconstructed in the step 50 to construct the water-resisting curtain.
The fifth stage:
and monitoring and analyzing the stability of the water-containing layer section of the water-proof curtain formed after slip joint grouting, and specifically comprising the following steps of:
step 100: embedding a microseismic detector and a tank wave detector in the compensated water-containing layer section in the slip joint grouting hole;
step 110: burying a water pressure sensor for monitoring the stability of the water-resisting layer in the slip joint grouting hole, wherein the water-resisting layer determined in the step 30 or the water-resisting layer reconstructed in the step 50 is located above the water-resisting layer;
step 120: after the coal seam is recovered, monitoring the microseismic detectors and the trough wave detectors installed in the steps 60 and 100, and if the monitoring result shows that the water-resisting layer is damaged by mining, further judging according to the water pressure sensor;
step 130: after the coal seam is recovered, monitoring the water pressure sensors installed in the step 70 and the step 110, drawing a water head contour map according to test data, and if the contour map is a low water head closed curve in a grouting area, determining the center of the closed curve to be the position of a funnel, namely an area where a water-resisting layer is damaged;
step 140: if the contour line drawn according to the monitored water head data is difficult to close and presents a low water head valley, the damage area of the water-resisting layer is determined in the low water head valley by referring to the microseism and the channel wave data.
The sixth stage:
and grouting and making up the damaged area of the water-resisting layer and the slip joint water-containing layer.
The stage specifically comprises the following steps:
step 150: and (3) performing supplementary grouting on the water-barrier damage area determined in the step 130 or the step 140 to repair the water-barrier until the funnel or the ground head valley disappears or is remarkably slowed down.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. A grouting treatment method for a coal seam roof huge-thickness water-containing layer area is characterized by comprising the following steps:
stage one: before mining, carrying out sedimentary facies analysis on the huge and thick aquifer of the roof, and selecting a river flood beach facies water-resisting layer as a target layer;
and a second stage: the method comprises the following steps of exploring and positioning a permeable skylight on a target layer, grouting and making up the target layer, and transforming the target layer into an available water-resisting layer, wherein the method specifically comprises the following steps:
step 20: carrying out seismic data reprocessing and interpretation on the target layer;
step 30: finding the position of the permeable skylight, and performing grouting transformation on the position of the permeable skylight to form an available water-resisting layer, so that the permeable skylight does not leak water any more, thereby dividing the water-bearing layer, reducing the thickness of the water-bearing layer and reducing the water inflow;
step 40: if no flood beach water-resisting layer exists, selecting a stronger water-bearing layer with the thickness of 3-10m above the water flowing fractured zone as a target layer for grouting transformation;
step 50: grouting the aquifer, and transforming the aquifer into a water-resisting layer so as to achieve the purposes of partitioning the aquifer and reducing the thickness of the aquifer;
and a third stage: monitoring the stability of the usable water-resisting layer after the roof is transformed, wherein the third stage specifically comprises the following steps:
step 60: embedding a microseismic detector and a tank wave detector in the water-resisting layer, and monitoring the damage condition of mining to the water-resisting layer;
step 70: burying a water pressure sensor for monitoring the stability of the water barrier in the water barrier determined in the step 30 or the water barrier modified in the step 50;
and a fourth stage: and after mining, grouting the sliding seam generated on the coal pillar top plate to form a waterproof curtain.
2. The method for treating the grouting area of the huge-thickness water-containing layer of the coal seam roof as claimed in claim 1, wherein the first stage specifically comprises the following steps:
step 10: and drilling a huge thick aquifer of the top plate, carrying out sedimentary facies analysis, and searching a river flood beach facies stratum with the thickness of more than 3m above the water flowing fractured zone to be used as a target layer for layering and thickening reduction.
3. The method for treating the grouting area of the huge-thickness water-containing layer of the coal seam roof as claimed in claim 1, wherein the fourth stage comprises the following steps:
step 80: the position of a sliding seam above the coal pillar is determined in an auxiliary mode;
step 90: and (4) grouting in the water-resisting layer determined in the step (30) or the aquifer sliding seam below the water-resisting layer reconstructed in the step (50) to construct a water-resisting curtain.
4. The method for treating the grouting area of the huge-thickness water-containing layer of the coal seam roof as claimed in claim 1, further comprising the following five stages:
monitoring and analyzing the stability of a water-containing layer section of a water-proof curtain formed after slip joint grouting, and specifically comprising the following steps of:
step 100: embedding a microseismic detector and a tank wave detector in the compensated water-containing layer section in the slip joint grouting hole;
step 110: embedding a water pressure sensor for monitoring the stability of the water-resisting layer in the slip joint grouting hole above the water-resisting layer determined in the step 30 or the water-resisting layer reconstructed in the step 50;
step 120: after the coal seam is recovered, monitoring the microseismic detectors and the trough wave detectors installed in the steps 60 and 100, and if the monitoring result shows that the water-resisting layer is damaged by mining, further judging according to the water pressure sensor;
step 130: after the coal seam is recovered, monitoring the water pressure sensors installed in the step 70 and the step 110, drawing a water head contour map according to test data, and if the contour map is a low water head closed curve in a grouting area, determining the center of the closed curve to be the position of a funnel, namely an area where a water-resisting layer is damaged;
step 140: if the contour line drawn according to the monitored water head data is difficult to close and presents a low water head valley, the damage area of the water-resisting layer is determined in the low water head valley by referring to the microseism and the channel wave data.
5. The method for treating the grouting area of the huge-thickness water-containing layer of the coal seam roof as claimed in claim 4, further comprising the sixth stage of:
grouting and remedying the damaged area of the water-resisting layer determined by monitoring, and specifically comprising the following steps:
step 150: and (3) performing supplementary grouting on the water-barrier damage area determined in the step 130 or the step 140 to repair the water-barrier until the funnel or the ground head valley disappears or is remarkably slowed down.
6. The method of claim 1, wherein the range of the waterproof curtain formed by slip joint grouting is below the water-proof layer made up in step 30 or the water-proof layer modified in step 50.
7. The method of claim 1, wherein the seismic data reprocessing and interpretation in step 20 comprises the steps of:
step 21: calibrating a geological horizon by using drilling data in the region, and determining the geological horizon of the reflected wave and the corresponding target layer reflected wave by comparing drilling time profiles;
step 22: continuously comparing and tracking the selected standard reflected wave as a main object according to the amplitude of the same phase axis of the reflected wave, the waveform, the wave group characteristics and the time difference characteristic, determining that the structure change and the breakpoint on the vertical section are the same phase axis dislocation, bifurcation, strong phase transfer, weakened amplitude and the like, determining that the fault or the phase change is generated, and determining the position of the permeable skylight;
step 23: the fluctuation form of the coal seam fold is explained by horizontal and bedding slices: the trend and the trend accurately determine the plane distribution rule of the fault or the permeable skylight through the discontinuity of the coherent slice;
step 24: and performing all-dimensional spatial homing on the three-dimensional data, establishing a spatial velocity field by using drilling data, performing time-depth conversion, and drawing a skylight distribution map and a fault distribution map of a target layer.
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| CN202010826411.1A CN111894588B (en) | 2020-08-17 | 2020-08-17 | Grouting treatment method for coal seam roof ultra-thick water-containing layer area |
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| CN202010826411.1A CN111894588B (en) | 2020-08-17 | 2020-08-17 | Grouting treatment method for coal seam roof ultra-thick water-containing layer area |
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| CN114658485B (en) * | 2022-03-02 | 2023-05-16 | 中煤科工集团西安研究院有限公司 | Composite disaster treatment method for water damage and rock burst of thick and hard sandstone roof of coal mine |
| CN115012933B (en) * | 2022-05-20 | 2023-01-17 | 安徽恒源煤电股份有限公司 | Zonal grouting construction method for stoping fault waterproof coal pillar |
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