CN115585013A - Water damage treatment method and construction method for coal seam mining in water-rich cutting structure - Google Patents
Water damage treatment method and construction method for coal seam mining in water-rich cutting structure Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 167
- 239000003245 coal Substances 0.000 title claims abstract description 157
- 238000005520 cutting process Methods 0.000 title claims abstract description 44
- 238000005065 mining Methods 0.000 title claims abstract description 32
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- 238000007689 inspection Methods 0.000 claims description 24
- 235000019738 Limestone Nutrition 0.000 claims description 18
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Abstract
The invention discloses a water damage treatment method and a construction method for coal seam mining in a water-rich cutting structure, which comprises the following steps: the method comprises the following steps: determining the type of the water-rich cutting according to the fault occurrence and the relative position relation between the coal bed and the aquifer; type I: two sides of the coal seam are butted with a lateral aquifer; type II: one side of the coal seam is butted with the lateral aquifer, and the other side of the coal seam is close to the lateral aquifer; type III: the two sides of the coal seam are close to lateral aquifers; and IV, type: a coal seam floor aquifer exists, and the thickness of the waterproof layer is insufficient; step two: determining a treatment range according to the type of the water-rich cutting; according to the invention, the lateral aquifer within a set range is grouted and transformed into the water-resisting layer, the transformed stratum is used as the waterproof and water-resisting rock pillar, meanwhile, the fault grouting is transformed into the water-resisting fault, and the coal pillar is reserved according to the water-resisting fault after the transformation, so that the width of the coal pillar is greatly shortened, the coal pillar resource recovery is realized, the coal resource utilization rate is improved, the economic benefit of the mine is increased, and the service life of the mine is prolonged.
Description
Technical Field
The invention belongs to the technical field of coal mine floor water prevention and control, and relates to a water damage treatment method and a construction method for coal seam mining in a water-rich cutting structure.
Background
The cutting is a geological structure widely developed on the crust of the earth, and is a groove-shaped fault block structure with two sides limited by high-angle faults and a descending middle part. In the North China coal briquette sedimentation basin, a coal bed bottom plate develops a plurality of limestone aquifers, particularly an Ordovician limestone aquifer used as a substrate has the characteristics of large thickness, high water pressure and strong water-rich property, and once the Ordovician limestone water protrudes into a mine, serious water damage accidents are often caused. In a cutting structure formed by the fault, the fault lifts the Ordovician ash water-bearing layer of the footwall to be close to the coal bed, even is in butt joint with the coal bed, the Ordovician ash water-bearing layer conducts water through the fault or directly fills water into the coal bed, and coal safety mining is seriously threatened. At present, for mining a coal bed in a cutting structure with a fault and an aquifer in the lateral direction, the water damage prevention and control method mainly reserves and prevents a water-proof coal rock pillar and prevents aquifer water from intruding into a mine excavation space, and the problems and the defects in the technology are as follows: (1) The waterproof coal-rock pillar can not be reused, so that a large amount of coal pillar resources become stagnant resources and can not be exploited, and the utilization rate of coal resources is reduced; (2) Continuous water-resisting layers with certain widths are required in the waterproof coal-rock pillar, deep fracture of a cutting structure is often accompanied by a large number of secondary faults, the continuity of the water-resisting layers is damaged by the aid of the water-guiding secondary faults, a channel for water in the water-bearing layers to intrude into a mine is formed, the waterproof coal-rock pillar loses water-resisting effect locally, and hidden danger of water inrush still exists in coal mining in the region.
Therefore, aiming at the problems and the defects, the invention researches and designs a water damage treatment method for coal mining in a water-rich cutting structure by intensively researching and designing and integrating experience and achievement of related professionals for many years so as to overcome the defects in the prior art.
Disclosure of Invention
The invention aims to provide a water damage treatment method and a construction method for coal seam mining in a water-rich cutting structure, and solves the problems that in the prior art, the utilization rate of coal resources is low, and the water-proof coal pillar locally loses water-proof property due to secondary water guide faults accompanied by deep fracture.
The technical scheme adopted by the invention is as follows:
a water damage treatment method for coal seam mining in a water-rich cutting structure comprises the following steps:
the method comprises the following steps: determining the type of the water-rich cutting according to the fault occurrence and the relative position relation between the coal bed and the aquifer;
type I: two sides of the coal seam are butted with lateral aquifers;
type II: one side of the coal seam is butted with the lateral aquifer, and the other side of the coal seam is close to the lateral aquifer;
type III: the two sides of the coal seam are close to lateral aquifers;
and (2) type IV: a coal seam floor aquifer exists, and the thickness of the waterproof layer is insufficient;
the criterion of the proximity of the coal bed and the lateral aquifer is as follows:
H＜(P 1 /T s +h p )/cosβ；
the judgment standard of the insufficient thickness of the water-resisting layer of the bottom plate is as follows:
H di ＜(P 2 /T s +h p )/cosβ；
in the formula: the vertical distance m between the intersection line of the H-coal seam bottom interface, the lateral water-bearing layer top interface and the fault plane; p 1 -lateral aquifer water pressure, MPa; p 2 -floor aquifer water pressure, MPa; t is a unit of s -critical water burst coefficient, MPa/m; h is p -floor failure depth, m; h di -the vertical distance, m, between the coal seam bottom interface and the water-bearing layer top interface of the bottom plate; beta-coal bed dip angle, °;
step two: determining a treatment range according to the type of the water-rich cutting;
(1) The treatment height of the lateral aquifer butted with the coal seam: distance H from top interface of water-bearing layer to bottom interface of coal bed d Depth of (d);
in the formula: h d -the vertical distance, m, of the lateral aquifer remediation bottom interface abutting the coal seam from the coal seam bottom interface; k-safety coefficient, taking 2-5 g, M-coal seam mining height, m; k p -tensile strength of coal, MPa; r-effective grouting radius, m; h t The normal distance between a lateral drilling point of the fault treatment hole and a fault plane is 10-15 m; alpha-fault dip, deg.; h is a total of d -the lead height of the lateral aquifer at the fault zone;
width B =2R + H of lateral aquifer treatment butted with coal seam t ；
(2) Treatment height of lateral aquifer close to coal seam: distance H from top interface of water-bearing layer to bottom interface of coal bed j Depth of (d);
H j ＝(P 1 /T s +h p )/cosβ+h d ；
in the formula: h j -the vertical distance, m, from the intersection of the lateral aquifer-governing bottom interface and the fault, close to the coal seam, to the coal seam bottom interface;
the width of treatment is the same as that in (1);
(3) Controlling range of a coal seam floor aquifer; cutting and stopping the production line and expanding for 30-60 m and all the bottom plate water-bearing layers between the faults at two sides;
the thin limestone with the thickness of 5-20 m is treated in full thickness; thick-bed limestone treatment height H z ＝P 2 /T s +h p -h g ；
In the formula: h is g -thickness of water barrier on the floor aquifer, m.
Optionally, said types I, II and III may be combined with type IV, respectively, to form types I-IV, II-IV and/or III-IV.
The invention discloses a construction method for controlling water damage of coal seam mining in a water-rich cutting structure.
Optionally, the method includes:
the method comprises the following steps: constructing a fault to treat a short branch hole; constructing 3-5 fault treatment short branch holes in each hole group, enabling the main shaft of each fault treatment hole to be parallel to a fault plane, and finding out the position of each fault;
step two: constructing lateral aquifer grouting holes; constructing N lateral aquifer grouting holes in each hole group, wherein the lateral aquifer grouting holes and a main shaft of a fault treatment hole are arranged in a three-flower mode, and upper branch holes are constructed first and lower branch holes are constructed later;
step three: constructing a bottom plate aquifer grouting hole;
the fault is constructed towards the water-bearing layer in the cutting section by the fault footwall, the comb-shaped arrangement is realized, the fault treatment short branch hole is prolonged in the water-bearing layer of the bottom plate by the water-bearing layer grouting hole of the bottom plate, and the fault treatment short branch hole and the water-bearing layer of the bottom plate are jointly arranged.
Optionally, the plane where the lateral aquifer grouting holes are located is parallel to the fault plane, and the hole spacing is 2R;
the normal distance between the main shaft of the fault treatment hole and the plane where the two lateral aquifer grouting holes are located is R;
the length of the lateral aquifer grouting hole is 400-500 m, and the length of the grouting segment is 150-250 m.
Optionally, the normal distance between the main axis of the fault treatment hole and the fault plane is 10-15 m, and a fault treatment short branch hole is laterally drilled and constructed in the direction of the fault plane every 150-200 m along the direction of the main axis of the fault treatment hole and penetrates through the fault plane by 30-50 m.
Optionally, the distance between the bottom plate aquifer grouting holes is 50-70 m;
grouting in two sections: grouting once for a penetration layer of 10-20 m, and grouting once for a final hole.
Optionally, in the first step, the pressure of grouting termination is 3-4 times of the pressure of an orifice reaching the water pressure of the treated aquifer, and the standard of grouting termination is that the flow is less than 50L/min, the pressure of grouting termination is reached, and the pressure is stabilized for 20-30 min.
Optionally, the method further includes the fourth step: constructing an inspection hole; constructing an inspection hole from the lateral aquifer grouting hole group, longitudinally penetrating the whole treatment height range from top to bottom, and transversely penetrating the fault plane by 30-50 m;
and constructing an inspection hole by the fault treatment hole group, longitudinally penetrating through the whole treatment height range from top to bottom, and transversely penetrating through the distance of R-1.5R of a plane where the lateral aquifer grouting hole is located.
Optionally, carrying out a pressurized water test every 100-150 m through the inspection hole, wherein the pressure of the pressurized water test reaches 1.0-1.2 times of grouting termination pressure, and the water absorption is qualified when the water absorption is less than 50L/min; otherwise, supplementary grouting is carried out by utilizing the inspection hole.
The invention has the beneficial effects that:
(1) The improved coal pillar grouting device has the advantages that the lateral aquifer grouting in the set range is transformed into the water barrier, the transformed stratum serves as a waterproof rock pillar, the fault grouting is transformed into the fault which cannot reach the water, the coal pillar is reserved according to the fault which cannot lead the water after the transformation, the width of the coal pillar is greatly shortened, the coal pillar resource recovery is realized, the coal resource utilization rate is improved, the mine economic benefit is increased, and the mine service life is prolonged.
(2) The invention realizes the integration of exploration, treatment and verification of 'water source-channel', and provides safe geological guarantee for mines from the perspective of water prevention and control. Forming a waterproof curtain in the coal seam lateral direction and the bottom plate aquifer through grouting to block a water filling source; the main fault forming the cutting structure is drilled and explored, fault errors caused by geophysical prospecting are eliminated, the fault form and position are accurately depicted and accurately positioned, and accurate data are provided for coal pillar setting; by grouting the main fault and the secondary fault, the water guide channel is comprehensively blocked, flood disasters are eliminated, and the safe exploitation of the coal bed is guaranteed.
Drawings
FIG. 1 is a cross-sectional view of a lateral aquifer treatment zone calculation and fault treatment hole, grout hole placement docked to a coal seam;
FIG. 2 is a cross-sectional view of a lateral aquifer treatment zone calculation and fault treatment hole, grout hole placement proximate to a coal seam;
FIG. 3 is a cross-sectional view of the arrangement of a fault treating hole and a grouting hole of a water-bearing stratum with a coal seam floor;
FIG. 4 is a sectional view of an arrangement of I type water-rich moat water damage control drill holes;
FIG. 5 is a sectional view of a type II water-rich moat water damage control borehole arrangement;
FIG. 6 is a sectional view of a III type water-rich moat water damage control borehole arrangement;
FIG. 7 is a sectional view of I-IV type water-rich cutting water damage control drill hole arrangement;
FIG. 8 is a sectional view of a type II-IV water-rich moat water damage control borehole arrangement;
FIG. 9 is a sectional view of III-IV type water-rich moat water damage control drill hole arrangement;
FIG. 10 is a cross-sectional view of an inspection hole arrangement;
FIG. 11 is a projection of the borehole in a horizontal plane;
FIG. 12 is a cross-sectional view of an example borehole;
the reference numerals in the figures denote: 1-coal bed, 2-lateral aquifer, 3-fault, 4-fault treatment hole, 5-lateral aquifer grouting hole, 6-bottom plate aquifer, 7-bottom plate aquifer grouting hole, 8-inspection hole, 9-fault treatment hole main shaft and 10-sidetracking point.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The water-rich cutting structure is a groove-shaped fault structure formed by surrounding coal-containing plots by high-angle faults on two sides, and rock strata rich in underground water are developed or communicated by the faults on the two sides.
The invention relates to a water damage treatment method for coal seam mining in a water-rich cutting structure, which comprises the following steps:
illustrating the complete steps of the process of the present invention
The method comprises the following steps: determining a water-rich cutting type according to the occurrence of a fault found by geophysical prospecting and drilling and the relative position relation between a coal bed and a water-bearing stratum;
according to the parameters, the determination method of the water-rich cutting type comprises the following steps:
type I: two sides of the coal seam are butted with lateral aquifers;
type II: one side of the coal seam is butted with the lateral aquifer, and the other side of the coal seam is close to the lateral aquifer;
type III: the two sides of the coal seam are close to lateral aquifers;
type IV: a coal seam floor aquifer exists, and the thickness of the water-resisting layer is insufficient;
the criterion for the proximity of the coal seam to the lateral aquifer is as follows:
H＜(P 1 /T s +h p )/cosβ；
the judgment standard of the insufficient thickness of the water-resisting layer of the bottom plate is as follows:
H di (P 2 /T s +h p )/cosβ；
in the formula: h-the vertical distance m between the intersection lines of the coal bed bottom interface and the lateral water-bearing layer top interface and the fault plane; p is 1 -lateral aquifer water pressure, MPa; p is 2 -floor aquifer water pressure, MPa; t is s -critical water burst coefficient, MPa/m; h is p -floor failure depth, m; h Bottom (C) -the vertical distance, m, between the coal seam bottom interface and the water-bearing layer top interface of the bottom plate; beta-coal bed dip angle, °.
In addition, I, II, III can be combined with IV respectively to form I-IV, II-IV, III-IV.
Step two: determining a treatment horizon
(1) As shown in fig. 1, the treatment height of the lateral aquifer docked with the coal seam: distance H from top interface of water-bearing layer to bottom interface of coal bed d Of the depth of (c).
In the formula: h d -the vertical distance, m, of the lateral aquifer remediation bottom interface abutting the coal seam from the coal seam bottom interface; k-safety coefficient, taking 2-5, M-coal seam mining height, m; k p -tensile strength of coal, MPa; r-effective grouting radius, m; h t The normal distance between a lateral drilling point of the fault treatment hole and a fault plane is 10-15 m; α -fault dip, °; h is d -the lateral aquifer is at the lead height of the fault zone.
Width B =2R + H for lateral aquifer treatment t ；
(2) As shown in fig. 2, the remediation height for lateral aquifers near the coal seam: distance H from top interface of water-bearing layer to bottom interface of coal bed j Depth of (d);
H j ＝(P 1 /T s +h p )/cosβ+h d ；
in the formula: h j -the vertical distance, m, of the lateral aquifer treatment floor interface close to the coal seam from the coal seam floor interface.
The width of the treatment is the same as that in (1).
(3) Referring to FIG. 3, the extent of the treatment of the aquifer of the floor of the coal seam
Cutting the hole and stopping the production line to expand by 30-60 m and all the bottom plate water-bearing layers between the faults at two sides.
The thin-layer limestone (5-20 m) is treated in full thickness; thick-bed limestone governance height H z ＝P 2 /T s +h p -h g ；
In the formula: h is g -thickness of water barrier on the floor aquifer, m.
The construction method specifically comprises the following steps:
the drill holes are arranged in a governing range in the following mode, and the diffusion range of the drilling grouting can be controlled in the governing range. Therefore, the distance between the uppermost and lowermost drilling holes of the lateral aquifer grouting hole and the top and bottom of the treatment range is smaller than R. And a fault treatment short branch is arranged at the top of the lateral aquifer close to the coal seam. The bottom plate aquifer grouting holes are arranged according to the description, similar to the bottom plate regional improvement, single-layer grouting holes are arranged on the thin-layer limestone, and multi-layer grouting holes are arranged on the thick-layer limestone.
The method comprises the following steps: construction fault treatment short branch hole
As shown in figures 1-2, the main axis of the fault treatment hole is parallel to the fault plane, the normal distance with the fault plane is 10-15 m, a fault treatment short branch hole is sidedrilled in the direction of the fault plane every 150-200 m along the main axis direction of the fault treatment hole, and the fault treatment short branch hole penetrates through the fault plane by 30-50 m to find the position of the fault.
Step two: construction lateral aquifer grouting hole
As shown in figures 1-2, N lateral aquifer grouting holes are constructed in each hole group, the lateral aquifer grouting holes and a main shaft of a fault treatment hole are arranged in a three-flower mode, upper branch holes are constructed first, and lower branch holes are constructed later.
The plane that lateral aquifer grouting holes are located is parallel to the fault plane, and the hole interval is 2R.
And the normal distance between the main shaft of the fault treatment hole and the plane where the two lateral aquifer grouting holes are located is R.
The length of the lateral aquifer grouting hole is 400-500 m, and the length of the grouting segment is 150-250 m.
Step three: construction bottom plate aquifer grouting hole
As shown in figures 3, 7-9 and 11, the construction is carried out from the lower wall of the fault to the water-bearing stratum in the cutting segment, the construction is carried out in a comb shape, and the hole spacing is 50-70 m. Grouting in two sections: grouting once for a penetrating layer of 10-20 m and grouting once for a final hole.
The bottom plate aquifer grouting hole prolongs the fault treatment short branch in the bottom plate aquifer, and the fault treatment short branch and the bottom plate aquifer grouting hole are jointly arranged.
In the construction method of the first step to the third step, the grouting stopping pressure is 3-4 times of the orifice pressure reaching the water pressure of the controlled aquifer, the grouting ending standard is that the flow is less than 50L/min, the grouting stopping pressure is reached, and the grouting is stabilized for 20-30 min.
Fig. 4-9 show the arrangement section of water damage treatment drill holes of six types of water-rich cutting.
Step four: construction inspection hole
As shown in figure 10, an inspection hole is constructed by a lateral aquifer grouting hole group, the inspection hole longitudinally penetrates through the whole treatment height range from top to bottom, and transversely penetrates through the fault plane by 30-50 m. And constructing an inspection hole from the fault treatment hole group, longitudinally penetrating through the whole treatment height range from top to bottom, and transversely penetrating through the plane R-1.5R where the lateral aquifer grouting hole is located.
And carrying out a pressurized water test every 100-150 m of the inspection hole, wherein the pressure of the pressurized water test reaches 1.0-1.2 times of grouting termination pressure, and the water absorption is qualified when the water absorption is less than 50L/min. Otherwise, the inspection hole is used for supplementary grouting.
The first embodiment is as follows:
a coal mine in Shandong develops a coal-containing cutting structure consisting of two faults F3 and F6, and a coal face is arranged between the F3 fault and the F6 fault. F3, cutting a plurality of faults by the inclination angle of 70 degrees and the fall of 50-150 m, wherein the extension length in the region is about 1850m and penetrates through the whole region; the dip angle of the F6 fault is 60 degrees, the fall is 70-210 m, the direction is north-west, the direction is south-west, the cutting is carried out with a plurality of faults, and the extension length in the region is about 2730m. On the elevation of a coal seam, the distance between two faults is 285m, the fault causes the footwall Ordovician limestone aquifer to be lifted, and on one side of the F6 fault, the Ordovician limestone aquifer and the fourteen ash aquifer are directly butted with the footwall coal seam to form a direct water filling structure, so that the coal seam mining is threatened; on one side of the F3 fault, the Ordovician limestone is positioned on the bottom plate of the coal bed and is close to the bottom plate; the distance between the three ash aquifers on the bottom plate and the coal bed is 47m, the thickness is 5.6m, and the maximum water pressure is 5MPa. In the process of working face tunneling and stoping, the water-bearing stratum is mainly threatened by lateral limestone water of a lower wall of a fault and bottom plate limestone water, and the water-bearing stratum mainly filled with water comprises Ordovician ash, triple ash and fourteen ash, wherein the static water pressure of the Ordovician ash water-bearing stratum is 4.3MPa, the unit water inflow is 0.0598-1.580L/(s.m), the water-rich property is weak-strong, and the threat to coal seam safety mining is the greatest.
If the coal safety mining is realized, the reserved waterproof and waterproof coal pillar is adopted for mining, 100m waterproof and waterproof coal pillars need to be set through calculation, the width of the residual working face is only 13-102 m, the working face design and the mining are difficult, and a large amount of coal resources are wasted. In order to eliminate the threat of bottom plate and lateral water damage, simultaneously liberate the coal pillar resources of the working face and improve the resource utilization rate, the invention implements water damage treatment by utilizing the method and liberates the resource reserve of 201 ten thousand tons.
The method comprises the following steps: and determining the water-rich cutting type according to the occurrence of the fault found by geophysical prospecting and drilling and the relative position relation between the coal bed and the aquifer.
F6, the inclination angle of the fault is 60 degrees, the fall is 70-210 m, and the Ordovician limestone aquifer is lifted to be in butt joint with the coal bed; f3 fault dip angle is 70 degrees, fall is 50-150 m, and Ordovician aquifer water pressure P 1 =4.3MPa, three ash aquifer water pressure P 2 Critical water inrush coefficient of =4.3MPa is 0.06MPa/m, the damage depth of a bottom plate is 21m, the inclination angle of a coal seam is 14 degrees, and H =61m < (P) 1 /T s +h p ) ,/cos β =95.5m, i.e. the olcement aquifer is close to the coal seam. The bottom plate of the coal seam has three ash aquifers and the thickness of the water-resisting layer is H di ＝47m＜(P 2 /Ts + hp)/cos β =107.5m, and the water barrier layer thickness is insufficient. The water-rich moat is divided into II-IV type.
Step two: determining a treatment horizon
(1) As shown in fig. 12, the treatment height of the lateral Ordovician aquifer butted with the coal seam on one side of the F6 fault is as follows: distance H from top interface of water-bearing layer to bottom interface of coal bed d Of the depth of (c).
In the formula: k-safety coefficient, taking 4,M-coal seam mining height, 6.5m; k p -tensile strength of coal, 0.6MPa; r-effective grouting radius, taking 15m; h t -taking 10m from the normal distance between the lateral drilling point of the fault control hole and the fault plane; h is a total of d The lateral aquifer is taken to be 8m at the leading height of the fault zone.
Width B =2R + H for lateral aquifer treatment t ＝40m；
(2) As shown in fig. 12, the treatment height of the lateral aquifer close to the coal seam on the side of the F3 fault: distance H from top interface of water-bearing layer to bottom interface of coal bed j The depth of (c).
H j ＝(P 1 /T s +h p )/cosβ+h d ＝103.5m；
In the formula: h j -the vertical distance, m, of the lateral aquifer treatment floor interface close to the coal seam from the coal seam floor interface.
The width of the treatment is the same as that in (1).
(3) Referring to fig. 3, the treatment range of the coal seam floor aquifer;
cutting the hole and stopping the production line to expand by 30-60 m and all the bottom plate water-bearing layers between the faults at two sides.
The thickness of the three-ash aquifer of the bottom plate is 5.6m, the three-ash aquifer belongs to thin-layer limestone, and the bottom plate aquifer grouting hole is utilized to carry out bedding drilling and full-thickness treatment.
Step three: construction fault treatment short branch hole
As shown in FIG. 11, the main axis of the fault treatment hole is parallel to the fault plane, the normal distance to the fault plane is 10m, a fault treatment short branch hole is drilled in the direction of the fault plane at intervals of 150m along the main axis direction of the fault treatment hole, and the fault treatment short branch hole penetrates through the fault plane by 40m to find out the position of the fault. 2 fault treatment short branch holes are arranged on one side of an F6 fault, 1 fault treatment short branch hole is arranged on one side of an F3 fault, and the length of each short branch hole is 160m.
Step four: construction lateral aquifer grouting hole
As shown in FIG. 11, two lateral aquifer grouting holes are constructed on one side of the F6 fault, and one lateral aquifer grouting hole is constructed on one side of the F3 fault. The lateral aquifer grouting holes and the fault treatment hole main shafts are arranged in a three-flower mode, the upper branch holes are constructed firstly, and the lower branch holes are constructed secondly.
The plane where the lateral aquifer grouting holes are located is parallel to the fault plane, and the hole spacing is 30m.
The normal distance between the main axis of the fault treatment hole and the plane where the two lateral aquifer grouting holes are located is 15m.
The length of a lateral aquifer grouting hole is 500m, and the length of a grouting segment is 200m.
Step five: construction bottom plate aquifer grouting hole
The construction is carried out from the lower wall of the F6 fault and the F3 fault to the water-bearing layer in the cutting segment, the cutting segments are arranged in a comb shape, and the hole spacing is 70m. Grouting in two sections: grouting once through a fault by 15m and grouting once through a final hole.
And in the third step, the grouting stopping pressure is 13MPa which is 3 times of the orifice pressure of the water pressure of the treated aquifer, and the grouting stopping standard is that the flow is less than 50L/min, the grouting stopping pressure is reached, and the grouting is stabilized for 20min.
Step six: construction inspection hole
As shown in figure 11, an inspection hole is constructed by a lateral aquifer grouting hole group, the longitudinal direction penetrates through the whole treatment height range from top to bottom, and the transverse direction penetrates through the fault surface 50m. An inspection hole is constructed by the fault treatment hole group, longitudinally penetrates through the whole treatment height range from top to bottom, and transversely penetrates through the plane where the lateral aquifer grouting holes are located by a distance of 15m.
And carrying out a water pressing test every 100m of the inspection hole, wherein the water pressing test pressure reaches 15MPa, and the water absorption capacity is less than 50L/min, namely the water is qualified. Otherwise, supplementary grouting is carried out by utilizing the inspection hole.
In the embodiment, 4 pairs of 8 hole groups (namely each pair of a fault treatment hole group and a lateral aquifer grouting hole group) are constructed in the F6 fault direction, 3 hole groups are constructed in the F3 fault direction, the length of each hole group treatment area is about 500m, 11 hole groups are constructed in total, 16 fault treatment short branch holes, 33 lateral aquifer grouting holes, 19 bottom plate aquifer grouting holes and 11 inspection holes are constructed.
According to the coal mine water-control law, the fault water-proof coal-rock pillar is calculated, the width of the F6 fault water-proof coal-rock pillar is 71.8-87.5 m (increasing along with the increase of the coal seam burial depth), and the width of the F3 fault water-proof coal-rock pillar is 46-56 m (increasing along with the increase of the coal seam burial depth). After the method is adopted for treatment, the F6 fault coal-rock column is shortened by 27m, and the width of the waterproof and water-proof coal-rock column is reserved after the treatment and is 44.8-60.5 m; the F3 fault coal pillar is calculated according to a water-resisting fault, 20m is reserved, and the length is shortened by 26-36 m. After the method is adopted to shorten the width of the coal rock pillar, the width of the working face is increased by 46-56 m, the reserve of coal pillar resources is liberated by 201 ten thousand t, and the mine income can be increased by about 20 million yuan.
The preferred embodiments were chosen and described in detail in conjunction with the appended drawings and their description is not intended to limit the invention. The specific technical features described above can be combined in any suitable form without contradiction, and the present invention is not described in detail. Any means for persons skilled in the art to make simple modifications or modifications such as arbitrary combinations or equivalent substitutions of technical solutions without departing from the scope of the technical solutions does not affect the essence of the technical solutions and still fall within the protective scope of the technical solutions represented by the embodiments of the present invention.
Claims (10)
1. A water damage treatment method for coal seam mining in a water-rich cutting structure is characterized by comprising the following steps:
the method comprises the following steps: determining the type of the water-rich cutting according to the fault occurrence and the relative position relation between the coal bed and the aquifer;
type I: two sides of the coal seam are butted with lateral aquifers;
type II: one side of the coal seam is butted with the lateral aquifer, and the other side of the coal seam is close to the lateral aquifer;
type III: two sides of the coal seam are close to lateral aquifers;
and IV, type: a coal seam floor aquifer exists, and the thickness of the waterproof layer is insufficient;
the criterion of the proximity of the coal bed and the lateral aquifer is as follows:
H＜(P 1 /T s +h p )/cosβ；
the judgment standard of the insufficient thickness of the water-resisting layer of the bottom plate is as follows:
H di ＜(P 2 /T s +h p )/cosβ；
in the formula: h, the vertical distance m between the intersection line of the coal bed bottom interface, the lateral water-containing layer top interface and the fault plane; p 1 -lateral aquifer water pressure, MPa; p is 2 -floor aquifer water pressure, MPa; t is s -critical water burst coefficient, MPa/m; h is a total of p -floor failure depth, m; h di -the vertical distance, m, between the coal seam bottom interface and the water-bearing layer top interface of the bottom plate; beta-coal bed dip angle, °;
step two: determining a treatment range according to the type of the water-rich cutting;
(1) The treatment height of the lateral aquifer butted with the coal seam: distance H from top interface of water-bearing layer to bottom interface of coal bed d Depth of (d);
in the formula: h d The vertical distance, m, between a lateral aquifer treatment bottom interface butted with the coal seam and the coal seam bottom interface; k, taking the safety coefficient as 2-5, M, namely the coal seam mining height m; k p -tensile strength of coal, MPa; r-effective grouting radius, m; h t The normal distance between a lateral drilling point of the fault control hole and a fault plane is 10-15 m; α -fault dip, °; h is a total of d -leading height of lateral aquifers on the fault zone;
width B =2R + H of lateral aquifer treatment butted with coal seam t ；
(2) Treatment height of lateral aquifer close to coal seam: distance H from top interface of water-bearing layer to bottom interface of coal bed j Depth of (d);
H j ＝(P 1 /T s +h p )/cosβ+h d ；
in the formula: h j The vertical distance m from the intersection line of the lateral aquifer governing bottom interface close to the coal seam and the fault to the coal seam bottom interface;
the width of treatment is the same as that in the step (1);
(3) The treatment range of the coal seam floor aquifer; cutting and stopping the production line and expanding for 30-60 m and all the bottom plate water-bearing layers between the faults at two sides;
the thin limestone with the thickness of 5-20 m is treated in full thickness; thick-bed limestone governance height H z ＝P 2 /T s +h p -h g ；
In the formula: h is g -thickness of water barrier on the floor aquifer, m.
2. A method of treating water damage during mining of a coal bed within a water-rich moat formation according to claim 1, wherein said types I, II and III may be combined with type IV to form types I-IV, II-IV and/or III-IV, respectively.
3. A water damage control construction method for coal seam mining in a water-rich cut structure is characterized in that the construction method is used for implementing the water damage control method for coal seam mining in the water-rich cut structure according to claim 1 or 2.
4. The water damage management construction method for coal seam mining in the water-rich cut structure according to claim 3, characterized by comprising:
the method comprises the following steps: constructing a fault to treat a short branch hole; constructing 3-5 fault treatment short branch holes in each hole group, enabling the main shaft of each fault treatment hole to be parallel to a fault plane, and finding out the position of each fault;
step two: constructing lateral aquifer grouting holes; constructing N lateral aquifer grouting holes in each hole group, wherein the lateral aquifer grouting holes and a fault treatment hole main shaft are arranged in a three-flower mode, upper branch holes are constructed first, and lower branch holes are constructed later;
step three: constructing a bottom plate aquifer grouting hole;
the lower plate of the fault is constructed to the water-bearing layer in the cutting block section, the comb-shaped arrangement is realized, the grouting holes of the water-bearing layer of the bottom plate prolong the fault treatment short branch holes in the water-bearing layer of the bottom plate, and the water-bearing layer and the bottom plate are jointly arranged.
5. The water damage treatment construction method for coal seam mining in the water-rich cutting structure according to claim 4, characterized in that the plane where the lateral aquifer grouting holes are located is parallel to the fault plane, and the hole spacing is 2R;
the normal distance between the main shaft of the fault treatment hole and the plane where the two lateral aquifer grouting holes are located is R;
the length of the lateral aquifer grouting hole is 400-500 m, and the length of the grouting segment is 150-250 m.
6. The water damage treatment construction method for coal seam mining in the water-rich cutting structure according to claim 4 or 5, characterized in that the normal distance between the main axis of the fault treatment hole and the fault plane is 10-15 m, and a fault treatment short branch hole is sidetracked and constructed every 150-200 m along the main axis direction of the fault treatment hole to the fault plane direction and penetrates through the fault plane by 30-50 m.
7. The water damage treatment construction method for coal seam mining in the water-rich cut structure according to claim 4 or 5, characterized in that the distance between the grouting holes of the bottom plate aquifer is 50-70 m;
grouting in two sections: grouting once for a penetration layer of 10-20 m, and grouting once for a final hole.
8. The water damage treatment construction method for coal seam mining in the water-rich cutting structure according to claim 4 or 5, characterized in that the grouting termination pressure in the first step to the third step is 3-4 times of the orifice pressure of the aquifer water pressure to be treated, and the grouting termination standard is that the flow is less than 50L/min, the grouting termination pressure is reached, and the grouting termination pressure is stabilized for 20-30 min.
9. The water damage treatment construction method for coal seam mining in the water-rich cutting structure according to claim 4 or 5, characterized by further comprising the fourth step of: constructing an inspection hole; constructing an inspection hole from the lateral aquifer grouting hole group, longitudinally penetrating the whole treatment height range from top to bottom, and transversely penetrating the fault plane by 30-50 m;
and constructing an inspection hole by the fault treatment hole group, longitudinally penetrating through the whole treatment height range from top to bottom, and transversely penetrating through the distance of R-1.5R of a plane where the lateral aquifer grouting hole is located.
10. The water damage treatment construction method for coal seam mining in the water-rich cutting structure according to claim 9, characterized in that a water pressing test is performed every 100-150 m through the inspection hole, the water pressing test pressure reaches 1.0-1.2 times of grouting termination pressure, and the water absorption is qualified if the water absorption is less than 50L/min; otherwise, supplementary grouting is carried out by utilizing the inspection hole.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116792099A (en) * | 2023-07-14 | 2023-09-22 | 安徽建筑大学 | Construction method and system for stoping fault waterproof coal pillar under upper and lower aquifer conditions |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116792099A (en) * | 2023-07-14 | 2023-09-22 | 安徽建筑大学 | Construction method and system for stoping fault waterproof coal pillar under upper and lower aquifer conditions |
| CN116792099B (en) * | 2023-07-14 | 2024-04-16 | 安徽建筑大学 | Construction method and system for stoping fault waterproof coal pillar under upper and lower aquifer conditions |
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