CN115113285A - Coal seam floor grouting reinforcement water inrush risk assessment method - Google Patents
Coal seam floor grouting reinforcement water inrush risk assessment method Download PDFInfo
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Abstract
The invention discloses a coal seam floor grouting reinforcement water inrush risk assessment method, which comprises the following steps: firstly, determining the position of a region to be reinforced; secondly, acquiring the original apparent resistivity of the region to be reinforced before reinforcement; thirdly, grouting and reinforcing the area to be reinforced; fourthly, determining an effective reinforcement area in the area to be reinforced after grouting reinforcement; and fifthly, evaluating the water inrush risk level of the region to be reinforced according to the effective reinforced region in the region to be reinforced after grouting reinforcement. According to the method, the position of the area to be reinforced is determined, the apparent resistivity of the area to be reinforced before and after grouting reinforcement is respectively measured, the effective reinforced area in the area to be reinforced after grouting reinforcement is determined, and then the water inrush risk level of the area to be reinforced is evaluated according to the effective reinforced area in the area to be reinforced, so that the evaluation of the determined water inrush risk level is more accurate, the method has a realistic and positive guiding effect on coal mine safety production, and the safety of coal mine production is improved.
Description
Technical Field
The invention belongs to the technical field of coal seam floor grouting reinforcement, and particularly relates to a coal seam floor grouting reinforcement water inrush risk assessment method.
Background
The coal mining is a big matter related to the country's countryside, China is one of the countries with the largest coal production quantity in the world, the geological and hydrogeological conditions of coal mines in China are very complex, a plurality of coal seams are threatened by various water bodies in the mining process, in recent years, as the coal mine production is continuously increased in mining depth, mining strength and mining breadth, the hydrogeological conditions of coal fields are more and more complex, bearing water of a bottom plate has increasingly serious threat to mine safety production, accidents of hurting people due to well flooding still occur frequently, great loss is brought to lives and properties of people, adverse factors of water severely restrict the sustainable development of coal industry, and environmental engineering such as water conservation, coal mining and the like is influenced. Until now, mine water damage is still a great hidden trouble for coal mine safety production. The method mainly comprises the steps of dewatering and depressurizing, curtain grouting and bottom plate grouting reinforcement transformation aiming at the Aohai water damage prevention and treatment measures, wherein three bottom plate water damage prevention and treatment technologies mainly aim at different aquifer characteristics, the bottom plate grouting reinforcement transformation is to construct grouting holes and perform grouting on the grouting holes, spaces such as bottom plate rock stratum cracks and small dissolved gaps are filled and squeezed by grout, the bottom plate of the stope is reinforced after coagulation and cementation, the mining resistance and high confined water damage resistance of the bottom plate rock stratum are enhanced, and water inrush accidents of the high confined aquifer of the bottom plate are prevented. At present, the technical means for grouting effect detection are more, mainly include karst grouting monitoring and tunnel grouting detection on a shallow layer on the ground, and the used technical means mainly include an electrical sounding method, a high-density direct current method, Rayleigh waves and the like; the grouting detection technology for the coal mine goaf mainly adopts a direct current method; but no better technical means and evaluation method exist at present for detecting the grouting reinforcement and transformation effect of the coal seam floor.
Therefore, at present, a coal seam floor grouting reinforcement water inrush risk assessment method which is simple in steps and novel and reasonable in design is lacked, and the grouting reinforcement transformation effect of the coal seam floor is detected and assessed.
Disclosure of Invention
The invention aims to solve the technical problem that the defects in the prior art are overcome, and provides a coal seam floor grouting reinforcement water inrush risk assessment method which is simple in steps, determines an effective reinforcement area in a region to be reinforced after grouting reinforcement by determining the position of the region to be reinforced and respectively measuring apparent resistivity before and after grouting reinforcement of the region to be reinforced, and then assesses the water inrush risk level of the region to be reinforced according to the effective reinforcement area in the region to be reinforced, so that the assessment of the determined water inrush risk level is more accurate, has a realistic positive guidance effect on coal mine safety production, improves the safety of coal mine production, and is convenient to popularize and use.
In order to solve the technical problems, the invention adopts the technical scheme that: a coal seam floor grouting reinforcement water inrush risk assessment method is characterized by comprising the following steps:
step one, determining the position of an area to be reinforced;
acquiring the original apparent resistivity of a region to be reinforced before reinforcement;
thirdly, grouting and reinforcing the area to be reinforced;
determining an effective reinforcement area in the area to be reinforced after grouting reinforcement;
and fifthly, evaluating the water inrush risk level of the region to be reinforced according to the effective reinforced region in the region to be reinforced after grouting reinforcement.
The coal seam floor grouting reinforcement water inrush risk assessment method is characterized by comprising the following steps: determining the position of the area to be reinforced in the first step, wherein the specific process is as follows:
and determining the positions of a coal seam bottom plate, a water-resisting layer and a water-bearing layer below the coal face, wherein the region of the water-resisting layer in the vertically upward moving region is a region to be reinforced.
The coal seam floor grouting reinforcement water inrush risk assessment method is characterized in that: acquiring the original apparent resistivity of the region to be reinforced before reinforcement in the second step, wherein the specific process is as follows:
step 201, sequentially arranging M groups of measuring points from back to front along the length direction of a coal face, wherein each group of measuring points comprises a first measuring point located in a haulage roadway and a second measuring point located in an air return roadway; wherein M is a positive integer and is more than or equal to 3;
step 202, measuring the apparent resistivity of the area to be reinforced at the M groups of measuring points respectively to obtain an original apparent resistivity sequence set of the M areas to be reinforced, wherein the apparent resistivity measuring methods of the areas to be reinforced at the M groups of measuring points are the same, and when measuring the apparent resistivity of the area to be reinforced at the M group of measuring points, the method mainly comprises the following steps:
step 2021, placing the transient electromagnetic instrument at the first measuring point of the mth group of measuring points, so that a horizontal plane where a transmitting coil of the transient electromagnetic instrument is located is perpendicular to a vertical plane where a central axis of the transportation roadway is located, clockwise rotating the transmitting coil of the transient electromagnetic instrument by 90 degrees, and during the rotating process of the transmitting coil of the transient electromagnetic instrument, measuring apparent resistivity of a region to be reinforced by the transient electromagnetic instrument according to set measuring intervals to obtain original apparent resistivity of the region to be reinforced at different angles at the first measuring point of the mth group of measuring points; wherein M is the number of the measuring points, M is more than or equal to 1 and less than or equal to M, and the measuring interval is 10-15 degrees;
step 2022, placing the transient electromagnetic instrument at a second measuring point of the mth group of measuring points, so that a horizontal plane where a transmitting coil of the transient electromagnetic instrument is located is vertically arranged with a vertical plane where a central axis of the return air tunnel is located, rotating the transmitting coil of the transient electromagnetic instrument counterclockwise by 90 degrees, and during the rotation of the transmitting coil of the transient electromagnetic instrument, measuring apparent resistivity of a region to be reinforced by the transient electromagnetic instrument according to set measuring intervals to obtain original apparent resistivity of the region to be reinforced at different angles at the second measuring point of the mth group of measuring points;
step 2023, arranging the original apparent resistivity of the region to be reinforced at different angles at the first measuring point of the m-th set of measuring points obtained in step 2021 and the original apparent resistivity of the region to be reinforced at different angles at the second measuring point of the m-th set of measuring points obtained in step 2022 according to the sequence of the measuring time to obtain an original apparent resistivity sequence set rho of the region to be reinforced at the m-th set of measuring points 0m The set of raw apparent resistivity sequences ρ 0m Comprises A original apparent resistivities, and the original apparent resistivity sequence set rho 0m The middle a-th original apparent resistivity is denoted as rho 0ma (ii) a Wherein A is a positive integer, a is an original apparent resistivity number, and a is more than or equal to 1 and less than or equal to A.
The coal seam floor grouting reinforcement water inrush risk assessment method is characterized by comprising the following steps: in the third step, grouting reinforcement is carried out on the area to be reinforced, and the method mainly comprises the following steps:
step 301, determining the aperture, the initial position and the end position of a test drill hole to be constructed in the area to be reinforced, constructing a test drill hole in the area to be reinforced, and grouting and reinforcing in the test drill hole; the test drill hole is arranged close to the left end of the area to be reinforced, and the center of the test drill hole is positioned on the horizontal central line of the area to be reinforced;
step 302, measuring the apparent resistivity of the region to be reinforced again at the M groups of measuring points according to the method in the step 202 to obtain a first apparent resistivity sequence set of M regions to be reinforced; measuring apparent resistivity of a region to be reinforced at the m-th group of measuring points to obtain a first apparent resistivity sequence set rho of the region to be reinforced at the m-th group of measuring points 1m The first apparent resistivity sequence set ρ 1m Comprises A first apparent resistivities, and the first apparent resistivity sequence set rho 1m The middle-alpha first apparent resistivity is denoted as rho 1ma ；
Step 303, performing data processing on the first apparent resistivity sequence set and the original apparent resistivity sequence set at the M groups of measuring points to obtain effective reinforcement areas and effective reinforcement widths of the test drill holes at the M groups of measuring points; for M groupsThe method for processing the data of the first apparent resistivity sequence set and the original apparent resistivity sequence set at the measuring points is the same, and the first apparent resistivity sequence set rho at the m-th group of measuring points is processed 1m And a set of raw apparent resistivity sequences ρ 0m When data processing is carried out, the method mainly comprises the following steps:
3031, a first apparent resistivity sequence set rho 1m A first apparent resistivities and the original apparent resistivity sequence set ρ 0m Matching the A original apparent resistivities one by one, and respectively calculating the amplification of the A first apparent resistivities at the m-th group of measuring points; the amplification calculation methods of the A first apparent resistivities are the same, and when the amplification of the a-th first apparent resistivity is calculated, a formula is used
Calculating to obtain the amplitude Z of the a-th first apparent resistivity 1a ；
Step 3032, determining an effective reinforcement area of the test drill hole at the mth group of test points according to the amplification of the A first apparent resistivity; wherein the division basis of the effective reinforcement area of the test borehole is: when the a-th first apparent resistivity ρ 1ma Is increased by Z 1a When the resistivity is more than or equal to 10 percent, the area corresponding to the a-th first apparent resistivity is positioned in the effective reinforcing area of the test drill hole;
step 3033, measuring the average width of the effective reinforcement area of the test drill hole at the m-th group of measuring points as the effective reinforcement width b of the test drill hole at the m-th group of measuring points 1m ；
Step 304, according to the formula
Calculating the average effective reinforcement width of the test borehole in the region to be reinforced
305, according to the formula
Determining the number of grouting holes to be constructed in the area to be reinforced; wherein,
denotes rounding up, B 1 The maximum width of the region to be reinforced;
step 306, constructing N grouting holes in the region to be reinforced along the length direction of the region to be reinforced, and performing grouting reinforcement in the N grouting holes to finish grouting reinforcement of the region to be reinforced; wherein the structure of the grouting holes is the same as that of the test drilling holes, the centers of N grouting holes and the center of the test drilling hole are positioned on the same horizontal plane, the hole distance between two adjacent grouting holes in the N grouting holes is k,
the coal seam floor grouting reinforcement water inrush risk assessment method is characterized by comprising the following steps: determining an effective reinforced area in the area to be reinforced after grouting reinforcement in the fourth step, wherein the specific process is as follows:
step 401, measuring the apparent resistivity of the region to be reinforced again at the M groups of measuring points according to the method in the step 302 to obtain a second apparent resistivity sequence set of M regions to be reinforced; measuring apparent resistivity of the region to be reinforced at the m-th group of measuring points to obtain a second apparent resistivity sequence set rho of the region to be reinforced at the m-th group of measuring points 2m The second apparent resistivity sequence set ρ 2m Comprises A second apparent resistivities, and the second apparent resistivity sequence set rho 2m The middle a second apparent resistivity is denoted as p 2ma ；
Step 402, according to the method in step 303, performing data processing on the second apparent resistivity sequence set and the original apparent resistivity sequence set at the M groups of measuring points, and determining effective reinforcing areas of N grouting holes at the M groups of measuring points.
The coal seam floor grouting reinforcement water inrush risk assessment method is characterized by comprising the following steps: and fifthly, evaluating the water inrush risk level of the region to be reinforced according to the effective reinforced region in the region to be reinforced after grouting reinforcement, wherein the concrete process is as follows:
when the effective reinforcing areas of two adjacent grouting holes at any one group of the M groups of measuring points are not communicated, the water inrush danger exists in the area to be reinforced;
when the effective reinforcing areas of two adjacent grouting holes at each group of measuring points in the M groups of measuring points are communicated, the water inrush danger does not exist in the area to be reinforced.
The coal seam floor grouting reinforcement water inrush risk assessment method is characterized by comprising the following steps: in step 301, the initial position and the end position of the test drill hole are both located in front of the working face open-off cut hole, the initial position of the test drill hole is determined by the width of the coal face, and the distance L between the initial position of the test drill hole and the working face open-off cut hole 1 ＝2B 0 +L 0 ，B 0 For the width of the coal face, L 0 For testing the spacing between the end position of the bore and the working-face cut-out, L 0 The value range of (A) is 20 m-40 m.
The method has the advantages that the position of the area to be reinforced is determined, the apparent resistivity of the area to be reinforced before and after grouting reinforcement is carried out is measured respectively to obtain the original apparent resistivity sequence set and the second apparent resistivity sequence set of the area to be reinforced, the effective reinforced area in the area to be reinforced after grouting reinforcement is determined according to the original apparent resistivity sequence set and the second apparent resistivity sequence set of the area to be reinforced, then the water inrush risk level of the area to be reinforced is evaluated according to the effective reinforced area in the area to be reinforced, the water inrush risk level determined by evaluation is more accurate, meanwhile, the water inrush risk area of the coal seam floor and the corresponding risk level of each area can be reflected vividly and intuitively, the method has a realistic and positive guiding effect on coal mine safety production, and the safety of coal mine production is improved.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a block flow diagram of the method of the present invention.
Fig. 2 is a schematic structural diagram of the present invention.
FIG. 3 is a schematic diagram of the positional relationship of the area to be reinforced, the haulage roadway, the return air roadway, the test drill hole and the grouting hole of the present invention.
Description of reference numerals:
1-coal face; 2-a coal seam floor; 3, a water-resisting layer;
4-an aqueous layer; 5-vertically moving up the zone; 6-area to be reinforced;
6-1-a reinforcement section; 6-2-safety section; 7-a haulage roadway;
8-return air tunnel; 9-a first measurement station; 10-a second measurement station;
11-transient electromagnetic instrument; 12-testing drilling; 13-grouting holes.
Detailed Description
As shown in FIG. 1, the method for evaluating the risk of water inrush in grouting reinforcement of a coal seam floor, provided by the invention, comprises the following steps:
step one, determining the position of an area to be reinforced;
acquiring the original apparent resistivity of a region to be reinforced before reinforcement;
thirdly, grouting and reinforcing the area to be reinforced;
determining an effective reinforcement area in the area to be reinforced after grouting reinforcement;
and fifthly, evaluating the water inrush risk level of the region to be reinforced according to the effective reinforced region in the region to be reinforced after grouting reinforcement.
The method has the advantages that the original apparent resistivity sequence set and the second apparent resistivity sequence set of the area to be reinforced 6 are obtained by determining the position of the area to be reinforced 6 and respectively measuring the apparent resistivity of the area to be reinforced 6 before and after grouting reinforcement, and determining an effective reinforced area in the area to be reinforced 6 after grouting reinforcement according to the original apparent resistivity sequence set and the second apparent resistivity sequence set of the area to be reinforced 6, then, the water inrush risk grade of the area to be reinforced 6 is evaluated according to the effective reinforced area in the area to be reinforced 6, the evaluation and determination of the water inrush risk grade are more accurate, meanwhile, the water inrush danger areas of the coal seam floor and the corresponding risk levels of all areas can be vividly and intuitively reflected, the method has a practical and positive guiding function on coal mine safety production, and improves the safety of coal mine production.
As shown in fig. 2, in this embodiment, the position of the region to be reinforced is determined in the first step, and the specific process is as follows:
and determining the positions of a coal seam bottom plate 2, a water-resisting layer 3 and a water-bearing layer 4 below the coal face 1, wherein the region of the water-resisting layer 3 in the vertically upward moving region 5 is a region 6 to be reinforced.
In this embodiment, it should be noted that, during the mining process of the coal face 1, the deformation damage of the water-resisting layer 3 below the coal face 1 mainly presents three different changing forms: firstly, a water-resisting layer 3 of a coal face 1 before mining is kept complete; secondly, the water separation layer 3 is gradually bent and deformed in the mining process of the coal face 1; finally, the waterproof layer 3 is obviously broken after the coal face 1 is mined, and the waterproof layer 3 in the vertically upward moving area 5 is broken firstly, so that the area of the waterproof layer 3 in the vertically upward moving area 5 is used as an area 6 to be reinforced, the area 6 to be reinforced is subjected to grouting reinforcement, and grout injected in the grouting reinforcement process is diffused in the area 6 to be reinforced and mixed and solidified with the rock mass of the area 6 to be reinforced, so that the mechanical property of the rock mass of the waterproof layer 3 is improved, the anti-permeability performance of the waterproof layer 3 is improved, the anti-deformation capability of the waterproof layer 3 is improved, and the condition that the water burst of the coal seam floor 2 is caused by the breakage of the waterproof layer 3 is effectively avoided.
In this embodiment, during the in-service use, regard as the whole width of waiting to consolidate regional 6 with the maximum width of waiting to consolidate regional 6, make and wait to consolidate regional 6 and be the rectangle structure, be convenient for guarantee to wait to consolidate regional 6's reinforcing effect.
As shown in fig. 2 and fig. 3, in the second embodiment, the original apparent resistivity of the region to be reinforced before reinforcement is acquired in the second step, and the specific process is as follows:
step 201, sequentially arranging M groups of measuring points from back to front along the length direction of the coal face 1, wherein each group of measuring points comprises a first measuring point 9 positioned in a haulage roadway 7 and a second measuring point 10 positioned in an air return roadway 8; wherein M is a positive integer and is more than or equal to 3;
step 202, measuring the apparent resistivity of the area 6 to be reinforced at the M groups of measuring points respectively to obtain an original apparent resistivity sequence set of the M areas 6 to be reinforced, wherein the apparent resistivity measuring methods of the areas 6 to be reinforced at the M groups of measuring points are the same, and when measuring the apparent resistivity of the area 6 to be reinforced at the M group of measuring points, the method mainly comprises the following steps:
2021, placing a transient electromagnetic instrument 11 at a first measuring point 9 of an mth group of measuring points, so that a horizontal plane where a transmitting coil of the transient electromagnetic instrument 11 is located is perpendicular to a vertical plane where a central axis of the haulage roadway 7 is located, clockwise rotating the transmitting coil of the transient electromagnetic instrument 11 by 90 degrees, and measuring apparent resistivity of the region 6 to be reinforced by the transient electromagnetic instrument 11 according to set measurement intervals in the rotating process of the transmitting coil of the transient electromagnetic instrument 11 to obtain original apparent resistivity of the region 6 to be reinforced under different angles at the first measuring point 9 of the mth group of measuring points; wherein M is the number of the measuring points, M is more than or equal to 1 and less than or equal to M, and the measuring interval is 10-15 degrees;
step 2022, placing the transient electromagnetic instrument 11 at the second measuring point 10 of the mth group of measuring points, so that a horizontal plane where a transmitting coil of the transient electromagnetic instrument 11 is located is vertically arranged with a vertical plane where a central axis of the air return tunnel 8 is located, rotating the transmitting coil of the transient electromagnetic instrument 11 counterclockwise by 90 degrees, and during the rotation process of the transmitting coil of the transient electromagnetic instrument 11, measuring the apparent resistivity of the region to be reinforced 6 by the transient electromagnetic instrument 11 according to a set measurement interval to obtain the original apparent resistivity of the region to be reinforced 6 at different angles at the second measuring point 10 of the mth group of measuring points;
step 2023, arranging the original apparent resistivity of the region to be reinforced 6 at different angles at the first measuring point 9 of the m-th set of measuring points obtained in step 2021 and the original apparent resistivity of the region to be reinforced 6 at different angles at the second measuring point 10 of the m-th set of measuring points obtained in step 2022 according to the sequence of the measuring time to obtain an original apparent resistivity sequence set rho of the region to be reinforced 6 at the m-th set of measuring points 0m The set of raw apparent resistivity sequences ρ 0m Comprises A original apparent resistivities, and the original apparent resistivity sequence set rho 0m The middle a-th original apparent resistivity is denoted as rho 0ma (ii) a Wherein A is a positive integer, a is an original apparent resistivity number, and a is more than or equal to 1 and less than or equal to A.
In this embodiment, it should be noted that, when the transient electromagnetic instrument 11 is used to measure the apparent resistivity of the region 6 to be consolidated, according to the electromagnetic induction principle, the high-power transient electromagnetic instrument 11 is placed in the transportation roadway 7 or the return air roadway 8, the large-current sudden change of the transient electromagnetic instrument 11 excites the transient electromagnetic field, the low-frequency part of the transient electromagnetic field can effectively enter the rock formation where the region 6 to be consolidated is located, and excites a secondary induced electromotive force in the rock formation where the region 6 to be consolidated is located, the secondary induced electromotive force is related to the electrical conductivity of the rock formation where the region 6 to be consolidated is located, the secondary induced electromotive force can effectively pass through the rock formation and enter the receiving coil of the transient electromagnetic instrument 11 again, the apparent resistivity of the rock formation where the region 6 to be consolidated is located is obtained by measuring the secondary induced electromotive force, the measurement is convenient, and other drilling construction is not required in the coal mine roadway, time and labor are saved, the measurement precision is high, and the popularization and the use are convenient;
in step 201, sequentially arranging M groups of measuring points from back to front along the length direction of the region 6 to be reinforced, wherein the first group of measuring points and the end position of the test drill hole 12 in the region 6 to be reinforced are positioned on the same vertical plane, and the last group of measuring points and the start position of the test drill hole 12 in the region 6 to be reinforced are positioned on the same vertical plane; each set of measuring points comprises a first measuring point 9 and a second measuring point 10, apparent resistivity of the area to be reinforced 6 around the set of measuring points is measured at the first measuring point 9 and the second measuring point 10 of each set of measuring points, the area to be reinforced 6 in a section around the set of measuring points can be measured in an all-around manner, the measuring range is wide, and the measuring precision is high;
the apparent resistivity of the region 6 to be reinforced at the M groups of measuring points is measured respectively, so that the overall reinforcing effect of the region 6 to be reinforced at the later stage can be evaluated conveniently, and the evaluation accuracy is high;
in step 202, when the apparent resistivity of the region to be reinforced 6 is measured at each measuring point, the transient electromagnetic instrument 11 needs to be rotated to ensure that the measurement range of the transient electromagnetic instrument 11 covers the whole region to be reinforced 6, so that the evaluation accuracy of the evaluation method is improved.
In this embodiment, in step 2021, when the transmitting coil of the transient electromagnetic instrument 11 rotates clockwise by 90 °, the transient electromagnetic instrument 11 rotates around the side of the transient electromagnetic instrument far from the coal face 1 as the center; in step 2022, when the transmitting coil of the transient electromagnetic instrument 11 rotates 90 ° counterclockwise, the transient electromagnetic instrument 11 rotates around the side thereof away from the coal face 1 as the center.
As shown in fig. 2 and fig. 3, in this embodiment, grouting reinforcement is performed on the region to be reinforced in the third step, which mainly includes the following steps:
step 301, determining the aperture, the initial position and the end position of a test borehole 12 to be constructed in the area 6 to be reinforced, constructing one test borehole 12 in the area 6 to be reinforced, and grouting reinforcement in the test borehole 12; the test drill hole 12 is arranged close to the left end of the area to be reinforced 6, and the center of the test drill hole 12 is located on the horizontal central line of the area to be reinforced 6;
step 302, measuring the apparent resistivity of the region 6 to be reinforced again at the M groups of measuring points according to the method in the step 202 to obtain a first apparent resistivity sequence set of M regions 6 to be reinforced; measuring apparent resistivity of the region 6 to be reinforced at the m-th group of measuring points to obtain a first apparent resistivity sequence set rho of the region 6 to be reinforced at the m-th group of measuring points 1m The first apparent resistivity sequence set ρ 1m Comprises A first apparent resistivities, and the first apparent resistivity sequence set rho 1m The first a-th apparent resistivity is denoted as p 1ma ；
Step 303, performing data processing on the first apparent resistivity sequence set and the original apparent resistivity sequence set at the M groups of measuring points to obtain effective reinforcement areas and effective reinforcement widths of the test drill holes 12 at the M groups of measuring points; the method for processing the first apparent resistivity sequence set and the original apparent resistivity sequence set at the M groups of measuring points is the same, and the first apparent resistivity sequence set rho at the mth group of measuring points 1m And the original apparent resistanceSet of rate sequences ρ 0m When data processing is carried out, the method mainly comprises the following steps:
3031, a first apparent resistivity sequence set rho 1m A first apparent resistivities and the original apparent resistivity sequence set ρ 0m Matching the A original apparent resistivities one by one, and respectively calculating the amplification of the A first apparent resistivities at the m-th group of measuring points; the amplification calculation methods of the A first apparent resistivities are the same, and when the amplification of the a-th first apparent resistivity is calculated, a formula is used
Calculating to obtain the amplitude Z of the a-th first apparent resistivity 1a ；
3032, determining an effective reinforcement area of the test borehole 12 at the m-th group of test points according to the amplification of the A first apparent resistivities; the division of the effective reinforcement area of the test borehole 12 is based on: when the a-th first apparent resistivity ρ 1ma Is increased by Z 1a When the apparent resistivity is more than or equal to 10 percent, the area corresponding to the a-th first apparent resistivity is positioned in the effective reinforcing area of the test borehole 12;
3033, the average width of the effective reinforcement area of the test borehole 12 at the m-th set of test points is measured as the effective reinforcement width b of the test borehole 12 at the m-th set of test points 1m ；
Step 304, according to the formula
Calculating the average effective reinforcement width of the test borehole 12 in the region 6 to be reinforced
305, according to the formula
Determining the number of grouting holes 13 to be constructed in the area 6 to be reinforced; wherein,
denotes rounding up, B 1 The maximum width of the region 6 to be reinforced;
step 306, constructing N grouting holes 13 in the region 6 to be reinforced along the length direction of the region, and performing grouting reinforcement in the N grouting holes 13 to finish grouting reinforcement of the region 6 to be reinforced; wherein the structure of the grouting holes 13 is the same as that of the test drill hole 12, the centers of the N grouting holes 13 and the center of the test drill hole 12 are all located on the same horizontal plane, the pitch between two adjacent grouting holes 13 in the N grouting holes 13 is k,
in this embodiment, in practical use, in the third step, a test borehole 12 is constructed in the region 6 to be reinforced, grouting reinforcement is performed in the test borehole 12, an original apparent resistivity sequence set and a first apparent resistivity sequence set measured before and after the grouting reinforcement of the test borehole 12 are compared, and an average effective reinforcement width of the test borehole 12 in the region 6 to be reinforced is determined
And according to the average effective reinforcement width of the test borehole 12 in the region 6 to be reinforced
The number of the constructed grouting holes 13 is determined.
In the embodiment, the area 6 to be reinforced comprises a reinforcing section 6-1 and a safety section 6-2, the test drill hole 12 and the grouting hole 13 are both positioned in the reinforcing section 6-1, the safety section 6-2 is positioned between the reinforcing section 6-1 and the working face open-off cut hole, the distance between the termination position of the test drill hole 12 and the working face open-off cut hole is the length of the safety section 6-2, the safety section 6-2 is arranged to avoid influencing the normal operation of the working face open-off cut hole when the test drill hole 12 and the grouting hole 13 are subjected to grouting operation in the reinforcing section 6-1, a safety range is reserved, and the safety is good.
In this embodiment, the test borehole 12 and the injection hole 13 are both directional long-distance boreholes, the hole diameter of the injection hole 13 is equal to that of the test borehole 12, the starting position of the injection hole 13 is the same as that of the test borehole 12, and the ending position of the injection hole 13 is the same as that of the test borehole 12.
In the embodiment, grouting reinforcement is performed in the grouting holes 13, so that grout and rock mass in the region 6 to be reinforced are mixed and solidified, the rock mass mechanical property of the water-resisting layer 3 is improved, the anti-permeability performance of the water-resisting layer 3 is improved, the resistance and deformation capacity of the water-resisting layer 3 is improved, and the condition that the water burst of the coal seam bottom plate 2 is caused by the breakage of the water-resisting layer 3 is effectively avoided.
In this embodiment, the effective reinforcement area in the area to be reinforced after grouting reinforcement is determined in step four, and the specific process is as follows:
step 401, measuring the apparent resistivity of the region 6 to be reinforced again at the M groups of measuring points according to the method in the step 302 to obtain a second apparent resistivity sequence set of M regions 6 to be reinforced; measuring the apparent resistivity of the area 6 to be reinforced at the m-th group of measuring points to obtain a second apparent resistivity sequence set rho of the area 6 to be reinforced at the m-th group of measuring points 2m The second apparent resistivity sequence set ρ 2m Comprises A second apparent resistivities, and the second apparent resistivity sequence set rho 2m The middle a second apparent resistivity is denoted as p 2ma ；
Step 402, according to the method described in step 303, performing data processing on the second apparent resistivity sequence set and the original apparent resistivity sequence set at the M groups of measuring points, and determining effective reinforcement areas of the N grouting holes 13 at the M groups of measuring points.
In the embodiment, in the fourth step, the transient electromagnetic instrument 11 is used for measuring the apparent resistivity of the area to be reinforced 6 after grouting reinforcement is completed to obtain a second apparent resistivity sequence set, and the original apparent resistivity sequence set and the second apparent resistivity sequence set acquired before and after grouting reinforcement of the area to be reinforced 6 are compared to obtain an effective reinforced area of the area to be reinforced 6.
In this embodiment, in the fifth step, the water inrush risk level of the region to be reinforced is evaluated according to the effective reinforced region in the region to be reinforced after grouting reinforcement, and the specific process is as follows:
when the effective reinforcing areas of two adjacent grouting holes 13 at any one group of the M groups of measuring points are not communicated, the area 6 to be reinforced has water inrush risk;
when the effective reinforcing areas of two adjacent grouting holes 13 at each group of measuring points in the M groups of measuring points are communicated, the area 6 to be reinforced has no water inrush risk.
In this embodiment, it should be noted that, in the fifth step, by observing whether the effective reinforcement areas of the two adjacent grouting holes 13 in the area to be reinforced 6 after grouting reinforcement are communicated, the water inrush risk degree of the area to be reinforced 6 during the stoping of the coal face 1 is evaluated, and the water inrush risk level of the area to be reinforced 6 after grouting reinforcement is obtained; when the effective reinforcing areas of two adjacent grouting holes 13 at each group of measuring points in the M groups of measuring points are communicated, the width of the effective reinforcing area of the area to be reinforced 6 covering the area to be reinforced 6 is shown, the influence of disturbance of the mining stress of the coal face 1 on the waterproof layer 3 is small, and at the moment, the area to be reinforced 6 has no water inrush risk; when the effective reinforcing areas of two adjacent grouting holes 13 at any one of the M groups of measuring points are not communicated, the effective reinforcing area of the area to be reinforced 6 does not cover the width of the area to be reinforced 6, the influence of the disturbance of the mining stress of the coal face 1 on the waterproof layer 3 is large, and at this time, the area to be reinforced 6 has water inrush danger.
In this embodiment, in step 301, the starting position and the ending position of the test borehole 12 are both located in front of the working face open-off cut, the starting position of the test borehole 12 is determined by the width of the coal face 1, and the distance L between the starting position of the test borehole 12 and the working face open-off cut 1 ＝2B 0 +L 0 ，B 0 For the width, L, of the coal face 1 0 To test the spacing between the end position of the bore 12 and the working face opening, L 0 The value range of (A) is 20 m-40 m.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims (7)
1. A coal seam floor grouting reinforcement water inrush risk assessment method is characterized by comprising the following steps:
step one, determining the position of a region to be reinforced;
acquiring the original apparent resistivity of a region to be reinforced before reinforcement;
thirdly, grouting and reinforcing the area to be reinforced;
determining an effective reinforcement area in the area to be reinforced after grouting reinforcement;
and step five, evaluating the water inrush risk level of the region to be reinforced according to the effective reinforced region in the region to be reinforced after grouting reinforcement.
2. The method for evaluating the risk of water inrush by grouting reinforcement of a coal seam floor according to claim 1, characterized by comprising the following steps: determining the position of the area to be reinforced in the first step, wherein the specific process is as follows:
the method comprises the steps of determining the positions of a coal seam bottom plate (2), a water-resisting layer (3) and a water-bearing layer (4) below a coal face (1), wherein the water-resisting layer (3) is positioned in a vertically upward moving area (5) and is an area (6) to be reinforced.
3. The method for evaluating the risk of water inrush by grouting reinforcement of a coal seam floor according to claim 1, characterized by comprising the following steps: acquiring the original apparent resistivity of the region to be reinforced before reinforcement in the second step, wherein the specific process is as follows:
step 201, sequentially arranging M groups of measuring points from back to front along the length direction of a coal face (1), wherein each group of measuring points comprises a first measuring point (9) located in a haulage roadway (7) and a second measuring point (10) located in an air return roadway (8); wherein M is a positive integer and is more than or equal to 3;
step 202, measuring the apparent resistivity of the area (6) to be reinforced at the M groups of measuring points respectively to obtain an original apparent resistivity sequence set of the M areas (6) to be reinforced, wherein the apparent resistivity measuring methods of the areas (6) to be reinforced at the M groups of measuring points are the same, and the method mainly comprises the following steps of:
step 2021, placing a transient electromagnetic instrument (11) at a first measuring point (9) of an m-th group of measuring points, enabling a horizontal plane where a transmitting coil of the transient electromagnetic instrument (11) is located and a vertical plane where a central axis of a transportation roadway (7) is located to be vertically arranged, clockwise rotating the transmitting coil of the transient electromagnetic instrument (11) by 90 degrees, and measuring apparent resistivity of a region to be reinforced (6) by the transient electromagnetic instrument (11) according to set measuring intervals in the rotating process of the transmitting coil of the transient electromagnetic instrument (11) to obtain original apparent resistivity of the region to be reinforced (6) at different angles of the first measuring point (9) of the m-th group of measuring points; wherein M is the number of the measuring points, M is more than or equal to 1 and less than or equal to M, and the measuring interval is 10-15 degrees;
step 2022, placing the transient electromagnetic instrument (11) at a second measuring point (10) of the mth group of measuring points, enabling a horizontal plane where a transmitting coil of the transient electromagnetic instrument (11) is located and a vertical plane where a central axis of the air return tunnel (8) is located to be vertically arranged, rotating the transmitting coil of the transient electromagnetic instrument (11) counterclockwise by 90 degrees, and measuring the apparent resistivity of the region to be reinforced (6) by the transient electromagnetic instrument (11) according to set measurement intervals in the rotating process of the transmitting coil of the transient electromagnetic instrument (11) to obtain the original apparent resistivity of the region to be reinforced (6) at different angles of the second measuring point (10) of the mth group of measuring points;
step 2023, arranging the original apparent resistivity of the region to be reinforced (6) at different angles at the first measuring point (9) of the m-th group of measuring points obtained in step 2021 and the original apparent resistivity of the region to be reinforced (6) at different angles at the second measuring point (10) of the m-th group of measuring points obtained in step 2022 according to the sequence of the measuring time to obtain an original apparent resistivity sequence set rho of the region to be reinforced (6) at the m-th group of measuring points 0m The set of raw apparent resistivity sequences ρ 0m Comprises A original apparent resistivities, and the original apparent resistivity sequence set rho 0m The middle a-th original apparent resistivity is denoted as rho 0ma (ii) a Wherein A is a positive integer, a is an original apparent resistivity number, and a is more than or equal to 1 and less than or equal to A.
4. The method for evaluating the risk of water inrush by grouting reinforcement of a coal seam floor according to claim 3, characterized by comprising the following steps: in the third step, grouting reinforcement is carried out on the area to be reinforced, and the method mainly comprises the following steps:
step 301, determining the aperture, the starting position and the ending position of a test drill hole (12) to be constructed in the area (6) to be reinforced, constructing one test drill hole (12) in the area (6) to be reinforced, and grouting and reinforcing in the test drill hole (12); the test drill hole (12) is arranged close to the left end of the area (6) to be reinforced, and the center of the test drill hole (12) is positioned on the horizontal central line of the area (6) to be reinforced;
step 302, measuring the apparent resistivity of the region (6) to be reinforced again at the M groups of measuring points according to the method in the step 202 to obtain a first apparent resistivity sequence set of M regions (6) to be reinforced; measuring apparent resistivity of the region (6) to be reinforced at the mth group of measuring points to obtain a first apparent resistivity sequence set rho of the region (6) to be reinforced at the mth group of measuring points 1m The first apparent resistivity sequence set ρ 1m Comprises A first apparent resistivities, and the first apparent resistivity sequence set rho 1m The first a-th apparent resistivity is denoted as p 1ma ；
303, carrying out data processing on the first apparent resistivity sequence set and the original apparent resistivity sequence set at the M groups of measuring points to obtain effective reinforcement areas and effective reinforcement widths of the test drill holes (12) at the M groups of measuring points; the method for processing the first apparent resistivity sequence set and the original apparent resistivity sequence set at the M groups of measuring points is the same, and the first apparent resistivity sequence set rho at the mth group of measuring points 1m And a set of raw apparent resistivity sequences ρ 0m When data processing is carried out, the method mainly comprises the following steps:
3031, a first apparent resistivity sequence set rho 1m A first apparent resistivities and the original apparent resistivity sequence set ρ 0m Matching the A original apparent resistivities one by one, and respectively calculating the amplification of the A first apparent resistivities at the m-th group of measuring points; wherein, A areThe amplification calculation methods of the first apparent resistivity are the same, and when the amplification of the a-th first apparent resistivity is calculated, a formula is used
Calculating to obtain the amplitude Z of the a-th first apparent resistivity 1a ；
3032, determining an effective reinforcement area of the test borehole (12) at the m-th group of measuring points according to the amplification of the A first apparent resistivities; wherein the division of the effective reinforcement area of the test borehole (12) is based on: when the a-th first apparent resistivity ρ 1ma Is increased by Z 1a When the apparent resistivity is more than or equal to 10 percent, the area corresponding to the a-th first apparent resistivity is positioned in the effective reinforcing area of the test drilling hole (12);
step 3033, measuring the average width of the effective reinforcement area of the test drill hole (12) at the m-th group of measuring points as the effective reinforcement width b of the test drill hole (12) at the m-th group of measuring points 1m ；
Step 304, according to the formula
Calculating the average effective reinforcement width of the test borehole (12) in the region (6) to be reinforced
305, according to the formula
Determining the number of grouting holes (13) to be constructed in the area (6) to be reinforced; wherein,
denotes rounding up, B 1 Is the maximum width of the region (6) to be reinforced;
step 306, constructing N grouting holes (13) in the region (6) to be reinforced along the length direction of the region, and performing grouting reinforcement in the N grouting holes (13) to finish the grouting reinforcement of the region (6) to be reinforced; wherein, the grouting holes(13) The structure of the test drilling hole (12) is the same as that of the test drilling hole (12), the centers of N grouting holes (13) and the center of the test drilling hole (12) are positioned on the same horizontal plane, the hole distance between two adjacent grouting holes (13) in the N grouting holes (13) is k,
5. the method for evaluating the risk of water inrush through grouting reinforcement of a coal seam floor according to claim 4, characterized by comprising the following steps: determining an effective reinforced area in the area to be reinforced after grouting reinforcement in the fourth step, wherein the specific process is as follows:
step 401, measuring the apparent resistivity of the region to be reinforced (6) again at the M groups of measuring points according to the method in the step 302 to obtain a second apparent resistivity sequence set of M regions to be reinforced (6); measuring apparent resistivity of the region (6) to be reinforced at the m-th group of measuring points to obtain a second apparent resistivity sequence set rho of the region (6) to be reinforced at the m-th group of measuring points 2m The second apparent resistivity sequence set ρ 2m Comprises A second apparent resistivities, and the second apparent resistivity sequence set rho 2m The middle a second apparent resistivity is denoted as p 2ma ；
Step 402, according to the method in step 303, performing data processing on the second apparent resistivity sequence set and the original apparent resistivity sequence set at the M groups of measuring points, and determining effective reinforcing areas of N grouting holes (13) at the M groups of measuring points.
6. The method for evaluating the risk of water inrush by grouting reinforcement of a coal seam floor according to claim 5, characterized by comprising the following steps: and fifthly, evaluating the water inrush risk level of the region to be reinforced according to the effective reinforced region in the region to be reinforced after grouting reinforcement, wherein the concrete process is as follows:
when the effective reinforcing areas of two adjacent grouting holes (13) at any one group of the M groups of measuring points are not communicated, the area (6) to be reinforced has water inrush risk;
when the effective reinforcing areas of two adjacent grouting holes (13) at each group of measuring points in the M groups of measuring points are communicated, the area (6) to be reinforced has no water inrush risk.
7. The method for evaluating the risk of water inrush through grouting reinforcement of a coal seam floor according to claim 4, characterized by comprising the following steps: in the step 301, the initial position and the end position of the test drill hole (12) are both located in front of the working face open-off cut, the initial position of the test drill hole (12) is determined by the width of the coal face (1), and the distance L between the initial position of the test drill hole (12) and the working face open-off cut 1 ＝2B 0 +L 0 ，B 0 For the width, L, of the coal face (1) 0 For testing the spacing between the end position of the bore (12) and the working-face opening, L 0 The value range of (a) is 20m to 40 m.
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| US5892361A (en) * | 1994-03-14 | 1999-04-06 | Baker Hughes Incorporated | Use of raw amplitude and phase in propagation resistivity measurements to measure borehole environmental parameters |
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