CN113464144A - Ground grouting process for treating water leakage and cracks of coal mine shaft in Lunan region - Google Patents
Ground grouting process for treating water leakage and cracks of coal mine shaft in Lunan region Download PDFInfo
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- CN113464144A CN113464144A CN202110665610.3A CN202110665610A CN113464144A CN 113464144 A CN113464144 A CN 113464144A CN 202110665610 A CN202110665610 A CN 202110665610A CN 113464144 A CN113464144 A CN 113464144A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D5/00—Lining shafts; Linings therefor
- E21D5/04—Lining shafts; Linings therefor with brick, concrete, stone, or similar building materials
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D5/00—Lining shafts; Linings therefor
- E21D5/12—Accessories for making shaft linings, e.g. suspended cradles, shutterings
Abstract
The invention provides a ground grouting process for treating water leakage and cracks of a coal mine shaft in the Lunan area, wherein the stratum of the coal mine shaft in the Lunan area is divided into a fourth system stratum, a Jurassic system stratum, a second system stratum and a carbonium system stratum from top to bottom, and the grouting process comprises the following steps: uniformly drilling a plurality of first hole sections on the periphery of a coal mine shaft, and installing first sleeves in the first hole sections; drilling a second hole section on the basis of the first hole section, installing a second casing in the second hole section, and injecting slurry into the second casing, wherein the second hole section penetrates through the interface of a fourth series formation and a Jurassic formation; drilling a third hole section on the basis of the second hole section, and injecting slurry into the third hole section; and carrying out hole sealing treatment on the first hole section, the second hole section and the third hole section. The invention solidifies the sand layer by filling the pores with cement slurry after entering the sand layer, and when the external stratum is settled, the grouting stratum plays a wedge role and controls water leakage and cracks of the well wall.
Description
Technical Field
The invention relates to the technical field of engineering construction, in particular to a ground grouting process for treating water leakage and cracks of a coal mine shaft in the Lunan region.
Background
The shaft is one of the most important roadway engineering in coal mines, is an underground entrance for conveying materials and workers and ventilating in mines, is also an important component of a coal mine safety guarantee system, and has no obvious significance to coal mines. The hydrogeological conditions of China are complex, the water damage of coal mines continuously occurs, and the coal mine barrels usually deform and break seriously to cause water seepage from the well wall, thereby causing great potential safety hazard to the safety production of the mines. The grouting and water plugging method is an important method for preventing and treating water damage of mines in China, the grouting technology is a branch of geotechnical engineering, and the grouting technology is characterized in that slurry prepared from certain materials is injected into strata or gaps by pressure feeding equipment to be expanded, gelled or solidified so as to fulfill the aims of strengthening the strata or preventing seepage and plugging. But because of factors such as complexity of grouting medium, concealment of grouting engineering, uncertainty of hydrogeological conditions and the like, and factors such as influence of slurry performance, grouting process and variability of grouting process on grouting quality and the like, the difficulty in treating well walls in different areas is increased. In addition, the stress state of the well wall in the grouting process is complex and dynamic, and a new challenge is provided for the treatment engineering of the well wall.
Disclosure of Invention
The invention provides a ground grouting process for treating water leakage and cracks of a coal mine shaft in a Lunan area, wherein the coal mine shaft in the Lunan area is cracked by a stratum compression effect, most of the cracked sections of the well wall are positioned in a bottom aquifer and a bedrock weathering zone layer, namely the junction of a fourth system stratum and a Jurassic system stratum, so that the sand layer is solidified by filling pores after cement slurry enters the sand layer, when an external stratum is settled, the grouting stratum plays a wedge role, so that the upper stratum is far away from the horizontal moving trend of the shaft, the vertical additional force applied to the shaft is reduced, and the ground grouting can fill and reinforce the pores of the stratum, the pores of the sand layer, the loose pores of the stratum formed after freezing the shaft and the drilling space for pulling out a freezing pipe, and simultaneously has the functions of splitting extrusion, reinforcement and water plugging on the stratum, so as to reduce the vertical additional stress until the well wall is offset, the purpose of treating the water leakage and the crack of the well wall is achieved.
According to the ground grouting process for treating water leakage and cracks of the coal mine shaft in the Lunan area, provided by the invention, the stratum of the coal mine shaft in the Lunan area is divided into a fourth system stratum, a Jurassic system stratum, a second-stacking system stratum and a carbonium system stratum from top to bottom, and the grouting process comprises the following steps:
uniformly drilling a plurality of first hole sections on the periphery of the coal mine shaft, and installing first sleeves in the first hole sections;
drilling a second bore section in the base of the first bore section, installing a second casing in the second bore section, and injecting a slurry into the second casing, wherein the second bore section passes through the interface of the fourth family of formations and the Jurassic formation;
drilling a third hole section on the basis of the second hole section, and injecting slurry into the third hole section;
and carrying out hole sealing treatment on the first hole section, the second hole section and the third hole section.
It should be noted that ground grouting can fill and reinforce stratum pores, sand layer pores, stratum loose pores formed after the frozen shaft is thawed and a drilling space for pulling out the frozen pipe, and simultaneously has the functions of splitting and extruding, reinforcing and water plugging on the stratum, so that the vertical additional stress of the shaft wall is reduced until offset, and the purpose of treating the damage of the shaft wall is achieved. Most of the broken sections of the shaft walls of the coal mine shafts in the southwest Lu are positioned in the bottom aquifer and the bedrock weathering zone layer, and the ground grouting method is utilized to have active guidance and reference functions on the treatment of the broken coal mine shafts in the area.
But because of factors such as complexity of grouting medium, concealment of grouting engineering, uncertainty of hydrogeological conditions and the like, and factors such as influence of slurry performance, grouting process and variability of grouting process on grouting quality and the like, the difficulty in treating well walls in different areas is increased. In addition, the stress state of the well wall in the grouting process is complex and dynamic, and a new challenge is provided for the treatment engineering of the well wall. The invention provides a ground grouting process for treating water leakage and cracks of a coal mine shaft in a Lunan region, which comprises the steps of ground grouting hole forming, grouting construction quality, grouting quality, ground drilling hole sealing and the like.
According to an embodiment of the invention, the first hole section has a depth of between 90 and 110 m.
Specifically, the embodiment provides an implementation mode of the depth of the first hole section, and the first hole section is set to be 90-110 m, so that the second hole section and the second casing are conveniently arranged, the slurry is effectively filled into gaps and weathering cracks, the stratum is compact and stable, and the connection between the lower group of the fourth series of strata and a bedrock weathering zone is blocked.
According to one embodiment of the invention, the number of the first hole sections is even.
Specifically, the present embodiment provides an implementation of the number of the first hole segments, and provides an implementation of punching the first hole segments.
According to one embodiment of the invention, a plurality of said first bore sections spaced apart are grouped into a group and said second bore sections and said third bore sections within the same group are simultaneously grouted.
Specifically, the present example provides an embodiment in which grouting is performed according to the number of first hole segments, and provides an embodiment in which grouting is performed into the second and third hole segments.
According to one embodiment of the invention, two opposite first hole sections are grouped into one group, and the second hole section and the third hole section in the same group are simultaneously grouted, and all the groups are separately grouted.
Specifically, this example provides another embodiment of grouting according to the number of first hole segments, and another embodiment of grouting into the second and third hole segments.
According to an embodiment of the invention, the depth of the second bore section through the interface of the fourth family of formations and the dwarfism family of formations is between 1 and 5 m.
Specifically, this example provides an embodiment of the depth of the second section of the hole, which allows the slurry to effectively fill the voids and weathering cracks and compact and stabilize the formation, blocking the connection between the lower group of the fourth series of formations and the matrix weathering zone.
According to an embodiment of the invention, the depth of the third bore section through the interface of the fourth family of formations and the dwarfism family of formations is between 15 and 30 m.
Specifically, this embodiment provides a third hole segment depth implementation that allows slurry to effectively fill voids and weathering fractures and compact and stabilize the formation, blocking the connection of the lower group of formations of the fourth series to the bed rock weathering zone.
It should be noted that, on the premise of ensuring the safety of the shaft, grouting and drilling are performed on the ground, single-fluid cement slurry is injected in sections, so that the slurry is driven by pressure to fill and compact the gaps between the medium-coarse sand layer, the weathered zone cracks and the shaft wall of the fourth-system stratum, and under certain pressure, the disturbed loose layer of the fourth-system stratum is further compacted when the fourth-system stratum is originally frozen for hole forming, so that the slurry forms an effective water-sealing curtain around the shaft, the sand layer water on the fourth-system stratum and under the fourth-system stratum is separated, the hydraulic connection channel between the lower part of the fourth-system stratum and the bedrock weathered zone is separated, the fourth-system stratum is stabilized, and the stratum at the cracks is effectively reinforced. The well bore and the surrounding stratum form a whole, and the earth stress on the well bore is balanced and consistent.
In an application scenario, the coal mine shaft in the managed southwestern area respectively exposes the following strata from top to bottom: the fourth series of strata, the Jurassic series of strata, the second series of strata and the carbonium series of strata. Wherein the thickness of the surface soil layer of the fourth series of strata is 123.5m, and the upper 296m section of the shaft is a freezing section. In actual detection, 2 cracks are found in the well wall, the first depth is 120m below the well head, and the depth of the fourth series is 3.5m above the bottom boundary of the stratum. 2 points are collected and the eye is estimated to be about 0.5m3The water source is the water of the sand layer of the lower group of the fourth series stratum; the second depth is 126m below the well head and 2.5m below the bottom boundary of the fourth series of strata. The water seepage and leakage section of the shaft wall is positioned between the upper opening of the shaft and the lower opening of the shaft for 20 to 130m, 10 parts of water seepage and 1 part of water leakage are realized, and the total water quantity is about 2.5m3/h。
Two cracks on the well wall are respectively positioned near the interface of the fourth series stratum and the bedrock, and the main reasons are as follows: firstly, the interface of the surface soil layer of the fourth series stratum of the shaft and the bedrock is a natural weak surface. Secondly, because the water is gushed into the well barrel by the sand layer of the lower group of the fourth series of strata, the water level of the aquifer is reduced, the soil layer is solidified and settled, the vertical additional force outside the well wall is continuously increased, and the well wall is cracked. Thirdly, after the freezing construction of the shaft is finished, a certain gap is formed behind the wall of the shaft wall when the freezing section is melted, the gap becomes a water guide channel, so that the dynamic water pressure born by different positions of the shaft wall is different, cracks or crazes appear at the weak part of the shaft wall, and the crack is particularly easy to appear at the junction of a surface soil section and a bedrock section.
The well wall gushing water is characterized in that: firstly, the water inrush section is basically positioned at the junction of the bottom of the fourth series stratum and bedrock; secondly, water outlet points are mostly positioned at the well wall crack at the well wall jointing part; thirdly, although part of the well wall has no open water points, the water seepage area is larger; fourthly, governing the key sections of 120m and 126m well wall crack sections.
According to an embodiment of the invention, the pore diameters of the first, second and third pore sections decrease in sequence; the pipe diameter of the first sleeve is larger than that of the second sleeve.
Specifically, the embodiment provides an implementation mode of the hole diameter of the hole section and the pipe diameter of the casing, and a scheme for sealing water in a water-bearing stratum by a top-down sectional grouting mode of drilling on the ground is provided through scientific analysis of water outlet and cracks of a shaft.
According to one embodiment of the present invention, the slurry is a single-fluid cement slurry comprising at least cement, triethanolamine and salt;
wherein the water cement ratio of the cement is between 0.6:1 and 1: 1;
the triethanolamine accounts for 0.5 per mill of the mass of the cement;
the salt is crushed fine salt which accounts for 5 per mill of the mass of the cement.
Specifically, this example provides an embodiment of a slurry.
In one application scenario, using cement 567.75T, the discharge consumes 5.4T of cement. 2.84T of common salt and 284kg of triethanolamine are used. 684m of single-liquid cement slurry is injected by common design of well wall grouting engineering3Actual finished grouting amount of 757m3110.7% of the design amount is completed, and when the number of the first hole segments is six, the first hole segments are divided into one group according to the relative hole segments, and the first hole segments can be divided into three groups, and the first group is injected with 279.04m of slurry3And 40.8% of the design amount is completed. The second set of holes injects slurry 238m334.8% of the design amount was completed, and the third group of holes was filled with 239.96m of slurry3And 35.1% of the design amount is completed.
According to one embodiment of the invention, in the process of injecting the grout into the second casing and the third hole section, if the final pressure value is greater than or equal to 2.5Mpa, the grouting amount is less than or equal to 100L/min and the stabilization time is not less than 20min, the grouting process is judged to be satisfactory.
Specifically, the present embodiment provides an implementation of determining a grouting process.
It should be noted that, through comparison between on-site observation and before grouting after ground grouting, there are 10 water seepage points and 1 water burst point in the well wall water outlet points before grouting, and after grouting, each water seepage point and water burst point are completely blocked by cement slurry, so that targeted repair is realized. The method has important theoretical reference value and guiding significance for the protection of the damaged shaft, the repair and treatment of the damaged shaft, the design of the coal mine shaft and the like.
Furthermore, according to the characteristics and conditions of water outlet and crack development of the shaft, the problem of continuous development of cracks at positions of 120m and 126m is mainly solved for the current ground grouting water shutoff, the shaft operation is effectively guaranteed, and the problems of reinforcement of a crack section of the shaft wall and water shutoff of the shaft wall are fundamentally solved although the construction period of the ground grouting is long and the cost is high. The scheme is constructed on the ground, has construction conditions, better construction environment and safety conditions and strong controllability and operability, and can realize the repair of the shaft as long as the grouting pressure and the grouting amount are strictly controlled, the grouting parameters are timely analyzed, and the shaft wall condition is closely observed. The method has important reference significance for treating water leakage and cracks of the coal mine shaft in the southwest Lu.
One or more technical solutions in the present invention have at least one of the following technical effects: the invention provides a ground grouting process for treating water leakage and cracks of a coal mine shaft in a Lunan region, and provides a scheme for sealing water in a water-bearing stratum by a top-down sectional grouting mode of drilling holes in the ground through scientific analysis of water outlet and cracks of the shaft. The grouting water plugging method can achieve expected effects, obtain better economic benefits and social benefits, and provide valuable reference for construction of similar projects of coal mines in the Lunan region.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic view of a ground grouting process for treating water leakage and cracks of a coal mine shaft in a Lunan region provided by the invention;
FIG. 2 is a schematic diagram of stratum distribution and drilling of a coal mine shaft in the Lunan area in the ground grouting process for treating water leakage and cracks of the coal mine shaft in the Lunan area;
FIG. 3 is a schematic diagram of a borehole in the ground grouting process for treating water leakage and cracks of a coal mine shaft in the Lunan region.
Reference numerals:
10. a fourth series of strata; 20. The formation of the Jurassic system; 30. A coal mine shaft;
40. a first bore section; 50. A second bore section; 60. A third bore section;
70. a first sleeve; 80. A second sleeve.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the embodiments of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In some embodiments of the present invention, as shown in fig. 1 to 3, the present disclosure provides a surface grouting process for treating water leakage and cracks in a coal mine shaft 30 in the southwestern region, wherein the strata of the coal mine shaft 30 in the southwestern region are divided into a fourth-line stratum 10, a dwarfism stratum 20, a second-line stratum and a carbonium-line stratum from top to bottom, and the grouting process comprises:
uniformly drilling a plurality of first hole sections 40 on the periphery of the coal mine shaft 30, and installing first sleeves 70 in the first hole sections 40;
drilling a second bore section 50 on the basis of the first bore section 40, installing a second casing 80 in the second bore section 50, and injecting a slurry into the second casing 80, wherein the second bore section 50 passes through an interface of the fourth family formation 10 and the dwarfism formation 20;
drilling a third bore section 60 on the basis of the second bore section 50 and injecting a slurry into the third bore section 60;
the first hole section 40, the second hole section 50 and the third hole section 60 are subjected to hole sealing treatment.
In detail, the invention provides a ground grouting process for treating water leakage and cracks of a coal mine shaft 30 in the southwest area, because the coal mine shaft 30 in the southwest area causes the shaft wall to crack under the action of stratum compression, and most of the broken sections of the shaft wall are positioned in the stratum of a bottom aquifer and a bedrock weathering zone, namely the junction of a fourth system stratum 10 and a Jurassic system stratum 20, the sand layer is solidified by filling pores after cement slurry enters the sand layer, when an external stratum is settled, the grouting stratum plays a wedge role, so that the upper stratum is far away from the horizontal moving trend of the shaft, thereby reducing the vertical additional force applied to the shaft, and the ground grouting can fill and reinforce the pores of the stratum, which are formed after the pores of the stratum, the pores of the sand layer and the frozen shaft are unfrozen, and fill and reinforce the drilling space of a freezing pipe, and has the functions of splitting extrusion, reinforcement and water plugging on the stratum, thereby reducing the vertical additional stress until offsetting the well wall and achieving the purpose of treating the water leakage and cracks of the well wall.
It should be noted that ground grouting can fill and reinforce stratum pores, sand layer pores, stratum loose pores formed after the frozen shaft is thawed and a drilling space for pulling out the frozen pipe, and simultaneously has the functions of splitting and extruding, reinforcing and water plugging on the stratum, so that the vertical additional stress of the shaft wall is reduced until offset, and the purpose of treating the damage of the shaft wall is achieved. Most of the broken sections of the well wall of the coal mine shaft 30 in the southwest Lu are positioned in the bottom aquifer and the bedrock weathering zone layer, and the ground grouting method is utilized to have active guidance and reference functions for the treatment of the broken coal mine vertical shaft in the area.
But because of factors such as complexity of grouting medium, concealment of grouting engineering, uncertainty of hydrogeological conditions and the like, and factors such as influence of slurry performance, grouting process and variability of grouting process on grouting quality and the like, the difficulty in treating well walls in different areas is increased. In addition, the stress state of the well wall in the grouting process is complex and dynamic, and a new challenge is provided for the treatment engineering of the well wall. The invention provides a ground grouting process for treating water leakage and cracks of a coal mine shaft 30 in the Lunan region, which comprises the steps of ground grouting hole forming, grouting construction quality, grouting quality, ground drilling hole sealing and the like.
It should also be noted that, as shown in fig. 3, the first hole segment 40 is marked on the periphery of the coal mine shaft 30, the drilling position of the first hole segment 40 is identified, and after the first hole segment 40 is drilled, the second hole segment 50 and the third hole segment 60 are drilled on the basis of the first hole segment 40.
In some possible embodiments of the invention, the depth of the first bore section 40 is between 90 and 110 m.
Specifically, the present embodiment provides an implementation of the depth of the first hole section 40, which facilitates the arrangement of the positions of the second hole section 50 and the second casing 80 by setting the first hole section 40 to 90 to 110m, ensures that the slurry is effectively filled into the gaps and the weathering cracks, and compacts and stabilizes the formation, and blocks the connection between the lower group of the fourth series of formations 10 and the bedrock weathering zone.
In some possible embodiments of the invention, the first bore sections 40 are evenly distributed axially about the coal mine shaft 30 in an even number.
Specifically, the present embodiment provides an embodiment of the number of first hole segments 40, and provides an embodiment of the first hole segments 40 being perforated.
In some possible embodiments of the invention, the spaced first bore sections 40 are grouped together and the second bore section 50 and the third bore section 60 within the same group are simultaneously grouted.
Specifically, the present embodiment provides an embodiment in which grouting is performed according to the number of the first hole segments 40, and an embodiment in which grouting is performed into the second hole segments 50 and the third hole segments 60.
In some possible embodiments of the invention, the opposing first bore sections 40 are grouped together and the second bore section 50 and the third bore section 60 in the same group are simultaneously grouted, with each grouping being separately grouted.
Specifically, the present embodiment provides another embodiment for grouting according to the number of first bore sections 40 and another embodiment for grouting into the second and third bore sections 50 and 60.
In some possible embodiments of the invention, the depth of the second bore section 50 through the interface of the fourth family formation 10 and the dwarfism formation 20 is between 1 and 5 m.
Specifically, this embodiment provides an embodiment of the depth of the second hole section 50, which allows the slurry to effectively fill the voids and weathered fractures and compact and stabilize the formation, blocking the connection between the lower group of the fourth series of formations 10 and the bedrock weathered zone.
In some possible embodiments of the invention, the depth of the third bore section 60 through the interface of the fourth family formation 10 and the dwarfism formation 20 is between 15 and 30 m.
Specifically, the present embodiment provides an embodiment of the depth of the third bore section 60 that allows slurry to effectively fill voids and weathering cracks and compact and stabilize the formation, blocking the connection of the lower group of the fourth series of formations 10 to the bed rock weathering zone.
It should be noted that, on the premise of ensuring the safety of the shaft, grouting and drilling are performed on the ground, single-fluid cement slurry is injected in sections, so that the slurry is driven by pressure to fill and compact the gaps between the coarse sand layer and the weathered zone crack of the fourth-system stratum 10 and the shaft wall, and under a certain pressure, the disturbed loose layer of the fourth-system stratum 10 is further compacted when the fourth-system stratum 10 is originally frozen for pore-forming, so that the slurry forms an effective water-sealing curtain around the shaft, the sand layer water above the fourth-system stratum 10 and below the fourth-system stratum 10 is separated, the hydraulic connection channel between the lower part of the fourth-system stratum 10 and the bedrock weathered zone stabilizes the fourth-system stratum 10, and the stratum at the crack is effectively reinforced. The well bore and the surrounding stratum form a whole, and the earth stress on the well bore is balanced and consistent.
In one application scenario, the coal mine shaft 30 in the treatment southwestern area respectively reveals strata from top to bottom: a fourth series of formations 10, a dwarfism series of formations 20, a second series of formations, and a carbonium series of formations. Wherein, the thickness of the topsoil layer of the fourth series stratum 10 is 123.5m, and the upper 296m section of the shaft is a freezing section. In actual detection, 2 cracks are found in the well wall, the first depth is 120m below the well head, and the bottom interface of the fourth series stratum 10 is 3.5 m. 2 points are collected and the eye is estimated to be about 0.5m3The water source is the water of the lower sand layer of the fourth series stratum 10; the second depth is 126m below the wellhead and 2.5m below the bottom boundary of the fourth series formation 10. The water seepage and leakage section of the shaft wall is positioned between the upper opening of the shaft and the lower opening of the shaft for 20 to 130m, 10 parts of water seepage and 1 part of water leakage are realized, and the total water quantity is about 2.5m3/h。
Two cracks on the well wall are respectively positioned near the interface of the fourth series stratum 10 and the bedrock, and the main reasons are as follows: firstly, the interface of the surface soil layer and the bedrock of the fourth series stratum 10 of the shaft is a natural weak surface. Secondly, because the lower sand layer of the fourth series stratum 10 gushes water into the well barrel, the water level of the aquifer is reduced, the soil layer is solidified and settled, the vertical additional force outside the well wall is continuously increased, and the well wall is cracked. Thirdly, after the freezing construction of the shaft is finished, a certain gap is formed behind the wall of the shaft wall when the freezing section is melted, the gap becomes a water guide channel, so that the dynamic water pressure born by different positions of the shaft wall is different, cracks or crazes appear at the weak part of the shaft wall, and the crack is particularly easy to appear at the junction of a surface soil section and a bedrock section.
The well wall gushing water is characterized in that: firstly, the water inrush section is basically positioned at the junction of the bottom of the fourth series stratum 10 and bedrock; secondly, water outlet points are mostly positioned at the well wall crack at the well wall jointing part; thirdly, although part of the well wall has no open water points, the water seepage area is larger; fourthly, governing the key sections of 120m and 126m well wall crack sections.
In some possible embodiments of the invention, the bore diameters of the first bore section 40, the second bore section 50 and the third bore section 60 decrease in sequence; the first sleeve 70 has a tube diameter greater than the tube diameter of the second sleeve 80.
Specifically, the embodiment provides an implementation mode of the hole diameter of the hole section and the pipe diameter of the casing, and a scheme for sealing water in a water-bearing stratum by a top-down sectional grouting mode of drilling on the ground is provided through scientific analysis of water outlet and cracks of a shaft.
In some possible embodiments of the invention, the slurry is a single-fluid cement slurry comprising at least cement, triethanolamine, and salt;
wherein the water cement ratio of the cement is between 0.6:1 and 1: 1;
the triethanolamine accounts for 0.5 per mill of the mass of the cement;
the salt is crushed fine salt with the mass of 5 per mill of the cement.
Specifically, this example provides an embodiment of a slurry.
In one application scenario, using cement 567.75T, the discharge consumes 5.4T of cement. 2.84T of common salt and 284kg of triethanolamine are used. 684m of single-liquid cement slurry is injected by common design of well wall grouting engineering3Actual finished grouting amount of 757m3110.7% of the design amount is completed, and when the number of the first hole segments 40 is six, the first hole segments are divided into one group according to the relative hole segments, and the first hole segments can be divided into three groups, and the first hole segments are injected with 279.04m of slurry3And 40.8% of the design amount is completed. The second set of holes injects slurry 238m334.8% of the design amount was completed, and the third group of holes was filled with 239.96m of slurry3And 35.1% of the design amount is completed.
In some possible embodiments of the present invention, during the process of injecting the slurry into the second casing 80 and the third bore section 60, if the final pressure value is greater than or equal to 2.5Mpa, the slurry injection amount is less than or equal to 100L/min, and the stabilization time is not less than 20min, it is determined that the slurry injection process is satisfactory.
Specifically, the embodiment provides an implementation manner for judging the grouting process, the second casing 80 is lowered into the top interface of the grouting section of the second hole section 50, the pipe is fixed by cement grout, after the pipe is solidified for 48 hours, the pipe is drilled to the designed grouting depth, the drilled hole is flushed by clear water, and the screw head and the casing for grouting are connected for grouting. And carrying out a water pressing test before grouting, and carrying out water pressing after grouting each time. After grouting, the grout stop plug can be lifted out of the hole after residual pressure in the hole is eliminated. The hole sweeping time after the single-liquid cement slurry is injected is generally 4 to 8 hours, and the re-injection interval time is generally 20 to 24 hours.
It should be noted that, through comparison between on-site observation and before grouting after ground grouting, there are 10 water seepage points and 1 water burst point in the well wall water outlet points before grouting, and after grouting, each water seepage point and water burst point are completely blocked by cement slurry, so that targeted repair is realized. The method has important theoretical reference value and guiding significance for the protection of the damaged shaft, the repair and treatment of the damaged shaft, the design of the coal mine shaft 30 and the like.
Furthermore, according to the characteristics and conditions of water outlet and crack development of the shaft, the problem of continuous development of cracks at positions of 120m and 126m is mainly solved for the current ground grouting water shutoff, the shaft operation is effectively guaranteed, and the problems of reinforcement of a crack section of the shaft wall and water shutoff of the shaft wall are fundamentally solved although the construction period of the ground grouting is long and the cost is high. The scheme is constructed on the ground, has construction conditions, better construction environment and safety conditions and strong controllability and operability, and can realize the repair of the shaft as long as the grouting pressure and the grouting amount are strictly controlled, the grouting parameters are timely analyzed, and the shaft wall condition is closely observed. The method has important reference significance for treating water leakage and cracks of the coal mine shaft 30 in the southwest Lu.
In one application scenario, dilute slurry is used as a flushing fluid to carry rock dust, cool the drilling tool, and protect the bore wall. The main component of the mud is bentonite, and the additives mainly comprise sodium carbonate (the addition amount is 0.5 to 1.5 percent of the dosage of the bentonite), cellulose (the addition amount is 0.3 to 0.5 percent of the dosage of the bentonite), and humic acid A (the addition amount is 0.1 to 0.3 percent of the dosage of the bentonite). The main performance index requirements of the slurry are as follows: viscosity of 18 to 25S, density of 1.15 to 1.25t/m3The water loss is less than or equal to 5 percent, the sand content is less than or equal to 4 percent, and the colloid rate is more than or equal to 97 percent. And in the drilling process of the grouting section, simple hydrological work such as flushing fluid consumption observation and the like is performed, and a drilling shift report is filled carefully in time. Carefully analyzing and recording the soft and hard state and the footage speed of the rock in the drilling process, analyzing the hydrogeological conditions and evaluating the grouting effect.
In one application scenario, a drilling apparatus comprises: 1.2 sets of 15.5mA type drilling towers (matched with chassis). 2. Model TXJ-1000 rig 2. 3. Model NBB-250/5 mud pump 2. 4. A 50 mm phi by 7mm drill rod 350 m. 5. Phi 105 multiplied by 25mm guide tube 12m and phi 159 multiplied by 51mm guide tube 10 m. 6. 650m (first sleeve 70) of seamless steel tube with diameter of 146X 5 mm; phi 108X 4.5mm seamless steel tube 780m (second sleeve 80). 7. Phi 190mm (or phi 215mm) tricone bits 3, phi 117.5mm tricone bits 6 (4 steel teeth, 2 inserts). 8. A plurality of other supporting devices and appliances.
The inclinometry orientation apparatus includes: 1. j2 theodolite 2-station. 2. A plurality of other supporting devices and appliances.
The pulping equipment comprises: 1. 4 sets of stand mixers (2 sets for standby). 2. PW-60 (or PW-100) type sewage pump 6, 20-30 m 34 submersible pumps are arranged per hour. 3. Slurry performance tester 2 sets. 4. A plurality of other supporting devices and appliances.
The power plant includes: 1. a motor and a starting cabinet which are matched with a drilling machine, a slurry pump, a grouting pump and the like. 2. A plurality of other supporting devices and appliances.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Finally, it should be noted that: the above embodiments are merely illustrative of the present invention and are not to be construed as limiting the invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and the technical solution of the present invention is covered by the claims of the present invention.
Claims (10)
1. A ground grouting process for treating water leakage and cracks of a coal mine shaft in a Lunan area is characterized in that strata of the coal mine shaft in the Lunan area are divided into a fourth system stratum, a Jurassic system stratum, a second-stacking system stratum and a carbonium system stratum from top to bottom, and the grouting process comprises the following steps:
uniformly drilling a plurality of first hole sections on the periphery of the coal mine shaft, and installing first sleeves in the first hole sections;
drilling a second bore section in the base of the first bore section, installing a second casing in the second bore section, and injecting a slurry into the second casing, wherein the second bore section passes through the interface of the fourth family of formations and the Jurassic formation;
drilling a third hole section on the basis of the second hole section, and injecting slurry into the third hole section;
and carrying out hole sealing treatment on the first hole section, the second hole section and the third hole section.
2. The ground grouting process for treating water leakage and cracks of coal mine shafts in the Lunan region as claimed in claim 1, wherein the depth of the first hole section is between 90 and 110 m.
3. The ground grouting process for treating water leakage and cracks of a coal mine shaft in a Lunan region as claimed in claim 1, wherein the number of the first hole sections which are uniformly distributed around the coal mine shaft in the axial direction is even.
4. The ground grouting process for treating water leakage and cracks of coal mine shafts in the Lunan region as claimed in claim 3, wherein a plurality of spaced first hole sections are grouped into one group, and grouting is simultaneously performed on the second hole sections and the third hole sections in the same group.
5. The ground grouting process for treating water leakage and cracks of a coal mine shaft in a Lunan region as claimed in claim 3, wherein two opposite first hole sections are divided into a group, grouting is simultaneously performed on the second hole section and the third hole section in the same group, and independent grouting is performed on all the groups respectively.
6. The surface grouting process for treating water leakage and fractures of coal mine shafts in the Lunan region of the China as claimed in claim 1, wherein the depth of the second hole section penetrating through the interface between the fourth series of strata and the Jurassic series of strata is between 1 and 5 m.
7. The surface grouting process for treating water leakage and fractures of coal mine shafts in the southwestern Lu region of claim 1, wherein the depth of the third hole section penetrating through the interface of the fourth series of strata and the Jurassic series of strata is between 15 and 30 m.
8. The ground grouting process for treating water leakage and cracks of a coal mine shaft in a Lunan region as claimed in any one of claims 1 to 7, wherein the pore diameters of the first pore section, the second pore section and the third pore section are sequentially decreased; the pipe diameter of the first sleeve is larger than that of the second sleeve.
9. The ground grouting process for treating water leakage and cracks of coal mine shafts in the Lunan region as claimed in any one of claims 1 to 7, wherein the slurry is a single-liquid cement slurry at least comprising cement, triethanolamine and salt;
wherein the water cement ratio of the cement is between 0.6:1 and 1: 1;
the triethanolamine accounts for 0.5 per mill of the mass of the cement;
the salt is crushed fine salt which accounts for 5 per mill of the mass of the cement.
10. The ground grouting process for treating water leakage and cracks of a coal mine shaft in a Lunan region according to any one of claims 1 to 7, wherein in the process of injecting the slurry into the second casing and the third hole section, if the final pressure value is more than or equal to 2.5MPa, the grouting amount is less than or equal to 100L/min and the stabilization time is not less than 20min, the grouting process is judged to be satisfactory.
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2222688C2 (en) * | 2001-12-27 | 2004-01-27 | Открытое акционерное общество "Сильвинит" | Expanding grouting mortar ( variants ) |
| RU2008126646A (en) * | 2008-06-30 | 2010-01-10 | Закрытое акционерное общество "Октопус" (RU) | METHOD FOR CONSTRUCTION OF DEEP WELL CONSTRUCTION CARBON SOLUTION FOR ITS IMPLEMENTATION AND DEEP WELL CONSTRUCTION |
| JP2010031544A (en) * | 2008-07-29 | 2010-02-12 | East Japan Railway Co | Hole wall protecting method of cast in place pile |
| CN103277120A (en) * | 2013-06-19 | 2013-09-04 | 西安科技大学 | Post-unfreezing water burst prevention method of non-full-depth freezing vertical shaft |
| CN103696775A (en) * | 2013-12-20 | 2014-04-02 | 中煤第一建设有限公司 | Large-stage-height multi-group water-containing layer segmented downward grouting method |
| CN107191188A (en) * | 2017-07-25 | 2017-09-22 | 马钢(集团)控股有限公司 | The bad water-bearing layer positioning targeting slip casting Mine Shaft Lining of rock section, constructing device and method |
| CN107313743A (en) * | 2017-07-04 | 2017-11-03 | 山西晋城无烟煤矿业集团有限责任公司 | One kind is using coal bed gas well to seat earth water barrier weak area band method for repairing and mending |
| CN109026011A (en) * | 2018-09-12 | 2018-12-18 | 北京中煤矿山工程有限公司 | Huge thickness rich water Denying Formation dolomite shaft of vertical well water-stop curtain controls grouting process |
| CN110094162A (en) * | 2019-04-15 | 2019-08-06 | 锡林郭勒盟山金白音呼布矿业有限公司 | A kind of drilling equipment and boring method of the pack hole for mine capital construction construction |
| CN111663918A (en) * | 2020-07-10 | 2020-09-15 | 中勘资源勘探科技股份有限公司 | Coal mining ground grouting process and grouting structure |
| CN111677513A (en) * | 2020-06-22 | 2020-09-18 | 安徽理工大学 | Water burst sand bursting disturbance deep unconsolidated formation ground grouting pore-forming method |
| AU2020102057A4 (en) * | 2019-12-26 | 2020-10-08 | Anhui University of Science and Technology | Method for grouting reinforcement of fault fracture zone of coal mining working face |
-
2021
- 2021-06-16 CN CN202110665610.3A patent/CN113464144A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2222688C2 (en) * | 2001-12-27 | 2004-01-27 | Открытое акционерное общество "Сильвинит" | Expanding grouting mortar ( variants ) |
| RU2008126646A (en) * | 2008-06-30 | 2010-01-10 | Закрытое акционерное общество "Октопус" (RU) | METHOD FOR CONSTRUCTION OF DEEP WELL CONSTRUCTION CARBON SOLUTION FOR ITS IMPLEMENTATION AND DEEP WELL CONSTRUCTION |
| JP2010031544A (en) * | 2008-07-29 | 2010-02-12 | East Japan Railway Co | Hole wall protecting method of cast in place pile |
| CN103277120A (en) * | 2013-06-19 | 2013-09-04 | 西安科技大学 | Post-unfreezing water burst prevention method of non-full-depth freezing vertical shaft |
| CN103696775A (en) * | 2013-12-20 | 2014-04-02 | 中煤第一建设有限公司 | Large-stage-height multi-group water-containing layer segmented downward grouting method |
| CN107313743A (en) * | 2017-07-04 | 2017-11-03 | 山西晋城无烟煤矿业集团有限责任公司 | One kind is using coal bed gas well to seat earth water barrier weak area band method for repairing and mending |
| CN107191188A (en) * | 2017-07-25 | 2017-09-22 | 马钢(集团)控股有限公司 | The bad water-bearing layer positioning targeting slip casting Mine Shaft Lining of rock section, constructing device and method |
| CN109026011A (en) * | 2018-09-12 | 2018-12-18 | 北京中煤矿山工程有限公司 | Huge thickness rich water Denying Formation dolomite shaft of vertical well water-stop curtain controls grouting process |
| CN110094162A (en) * | 2019-04-15 | 2019-08-06 | 锡林郭勒盟山金白音呼布矿业有限公司 | A kind of drilling equipment and boring method of the pack hole for mine capital construction construction |
| AU2020102057A4 (en) * | 2019-12-26 | 2020-10-08 | Anhui University of Science and Technology | Method for grouting reinforcement of fault fracture zone of coal mining working face |
| CN111677513A (en) * | 2020-06-22 | 2020-09-18 | 安徽理工大学 | Water burst sand bursting disturbance deep unconsolidated formation ground grouting pore-forming method |
| CN111663918A (en) * | 2020-07-10 | 2020-09-15 | 中勘资源勘探科技股份有限公司 | Coal mining ground grouting process and grouting structure |
Non-Patent Citations (2)
| Title |
|---|
| 梁作江, 阎军: "鲍店煤矿井筒注浆加固方法及效果", 煤田地质与勘探, no. 06, pages 54 - 55 * |
| 马新平;刘金国;: "综合注浆治理技术在井巷工作面高压突水中的应用", 煤炭与化工, no. 12, pages 223 - 227 * |
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