CN112377237A - Fully-surrounding fire extinguishing treatment method for smoldering fire area of coal gangue yard - Google Patents
Fully-surrounding fire extinguishing treatment method for smoldering fire area of coal gangue yard Download PDFInfo
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- CN112377237A CN112377237A CN202011195245.6A CN202011195245A CN112377237A CN 112377237 A CN112377237 A CN 112377237A CN 202011195245 A CN202011195245 A CN 202011195245A CN 112377237 A CN112377237 A CN 112377237A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
- E21F5/08—Rock dusting of mines; Depositing other protective substances
Abstract
The invention discloses a fully-surrounded fire extinguishing management method for a smoldering fire area of a coal gangue field, wherein curtain drill holes are arranged at the periphery of the smoldering fire area of the coal gangue field, one-way grouting pipes are arranged in the curtain drill holes, and grouting is carried out for multiple times by means of sectional pressurization to form a curtain; shallow drilling holes and deep drilling holes are arranged in a curtain area surrounded by the curtain drilling holes at intervals, a one-way grouting pipe is arranged in each shallow drilling hole, and grouting is performed for multiple times by means of segmented pressurization to form a grout cover which surrounds and covers the fire area with the curtain; placing a grouting perforated pipe in the deep drill hole, and fully filling gaps in a fire area by grouting to finish the slurry coating of the coal gangue; and keeping the air-bleed and temperature-measuring drill hole in the curtain area during the treatment period; finally, sealing all the drilled holes to complete the complete surrounding fire extinguishing of the smoldering fire area and form a complete consolidation body in the treatment area; the hole depth of the curtain drilling hole is larger than the maximum burial depth of the smoldering fire area, the shallow drilling hole is drilled to the top of the smoldering fire area, and the deep drilling hole penetrates through the smoldering fire area. The invention can completely extinguish the ignition point in the coal gangue yard, eliminate the threat to the ecological environment and make the land reusable.
Description
Technical Field
The invention belongs to the field of geological disaster treatment, and particularly relates to a fully-surrounded fire extinguishing treatment method for a smoldering fire area of a coal gangue yard.
Background
Coal gangue is a hard black and gray rock with low carbon content associated with coal seams, and belongs to solid waste compared with coal. The coal gangue produced by coal mines in mountainous areas is basically abandoned in the ditches and covered by loess, and flat areas are piled on the ground on the plain to form the taper-like gangue hills, thereby occupying valuable cultivated land resources and influencing ecological environment. Coal gangue generally contains certain combustible substances, and spontaneous combustion is very easy to occur under the condition. The burning coal gangue can generate a large amount of smoke and dust, and CO and SO are released2、H2S、NO2And the harmful gases not only affect the health of surrounding residents, but also pollute surface water, underground water and soil. Therefore, the influence of spontaneous combustion of the coal gangue cannot be ignored, and fire extinguishing treatment is required.
The method for treating the surface layer of the coal gangue yard by spontaneous combustion is more, for example, a method for directly excavating and covering the coal gangue yard, a method for isolating oxygen from entering by slope rolling, a method for covering the surface of the spontaneous combustion coal gangue yard with flame retardant, a method for modifying to form a terrace-shaped model, forming a groove and greening, a comprehensive treatment system of the spontaneous combustion coal gangue yard and the like are adopted; the method can play a role in extinguishing fire on the surface layer of the coal gangue, but with uneven settlement and rainwater erosion of the gangue dump/field side slope, new gas transmission channels can be gradually generated, and finally the situation of extinguishing and reburning can occur.
The fire extinguishing treatment method for the smoldering fire area in the coal gangue yard is more, the spontaneous combustion fire extinguishing of the coal gangue is generally considered to be capable of inflaming retarding and fire extinguishing as long as air is isolated, temperature is reduced, and oxidation reaction is prevented, but the examples of re-burning after the treatment of the coal gangue fire area in the industry are rare, which shows that the effect of the existing treatment method after fire extinguishing is not ideal, and the research on the method for treating the coal gangue self-combustion fire area is never stopped. The Chinese patent with the patent number of CN201110369772.9 discloses a gangue dump fire extinguishing method, which adopts the methods of temperature measurement, slope cutting, berm road repairing, punching and grouting, and the like, wherein the flushing fluid for punching and grouting is a colloid material, the angle requirement of the end part of a drill bit is 45 degrees, and the grouting slurry adopts a composite gel chemical fire extinguishing material with a very low price. The application of the composite colloid grouting material in the comprehensive treatment of the spontaneous combustion gangue dump refers to a grouting hole, and composite colloid with chemical components is poured into the grouting hole. The article 'the technology of grouting reinforcement and fire extinguishing of the gangue dump in the ancient book institute' refers to that a shallow drilling hole and a deep drilling hole are combined to conduct fire extinguishing and cooling on the surface layer of the gangue dump and interior deep cooling and reinforcement, a gravity-like retaining wall structure is formed at the slope of the gangue dump, the slope is stable, and the visible grouting fire extinguishing area is a flammable area of the slope of the gangue dump. In the article 'research on coal gangue dump deep hole grouting fire extinguishing', a construction process taking deep hole grouting as a main part and loess covering as an auxiliary part is provided, and a grouting material is a gel type fire extinguishing material with controllable alkalinity, thixotropy or initial setting time. The article 'coal gangue dump grouting fire extinguishing treatment' describes that firstly, a relative number of drill holes are arranged according to the area of a treatment area, secondly, according to the characteristics of the gangue dump, a fire extinguishing material which is suitable for the coal gangue dump grouting fire extinguishing treatment area is selected to be prepared into fire extinguishing slurry according to a certain proportion, and finally, the fire extinguishing slurry is injected into the spontaneous combustion gangue dump by using a grouting pump, so that the visible drill holes are not classified, the drill hole arrangement process is not involved, and the slurry proportion is not classified according to the specific conditions of a gangue fire area and the periphery. The article 'spontaneous combustion treatment and fire extinguishing process of coal gangue dump' recognizes that certain difficulty exists in treatment of a smoldering area in the deep part of coal gangue, and only a treatment method for drilling deep holes and increasing grouting amount is provided for the treatment, so that no specific implementation step is needed. In the article, the self-combustion gangue dump grouting fire extinguishing and ecological restoration construction process analysis mainly adopts a way of arranging hole sites on a sidewalk and a square, directly drives the holes into the holes and adopts a drilling way, does not explain the slurry proportion and classifies according to the specific conditions of a gangue fire area and the periphery.
In summary, the research on coal gangue from fire areas has been well-known, the treatment methods are more, and the used materials have advantages and disadvantages, wherein the biggest disadvantage is that the prior grouting can not form effective inclusion and covering body, and extinguishment and re-combustion are carried out, or the cost of using novel grouting materials is higher, and the unit price per square meter of the cost for extinguishing fire by using chemical grout even exceeds the unit price of waste rock discharge.
Disclosure of Invention
Aiming at the defects and shortcomings in the prior art, the invention provides a fully-surrounded fire extinguishing treatment method for a smoldering fire area of a coal gangue yard, and aims to solve the problems in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a fully-surrounded fire extinguishing treatment method for a smoldering fire area of a coal gangue yard is characterized in that curtain drill holes are arranged at the periphery of the smoldering fire area of the coal gangue yard, one-way grouting pipes are arranged in the curtain drill holes, and grouting is carried out for multiple times by means of segmented pressurization to form a curtain; shallow drilling holes and deep drilling holes are arranged in a curtain area surrounded by the curtain drilling holes at intervals, a one-way grouting pipe is arranged in each shallow drilling hole, and grouting is performed for multiple times by means of segmented pressurization to form a grout cover which surrounds and covers the fire area with the curtain; placing a grouting perforated pipe in the deep drill hole, and fully filling gaps in a fire area by grouting to finish the slurry coating of the coal gangue; and keeping the air-bleed and temperature-measuring drill hole in the curtain area during the treatment period; finally, sealing all the drilled holes to complete the complete surrounding fire extinguishing of the smoldering fire area and form a complete consolidation body in the treatment area to completely extinguish the fire points in the coal gangue yard; the hole depth of the curtain drilling hole is larger than the maximum burial depth of the smoldering fire area, the shallow drilling hole is drilled to the top of the smoldering fire area, and the deep drilling hole penetrates through the smoldering fire area.
The invention also comprises the following technical characteristics:
specifically, the method comprises the following steps:
and 3, shallow drilling grouting: a steel one-way grouting pipe is arranged in the shallow drilling hole, grout which can be quickly solidified is injected for multiple times by means of segmented pressurization, a grout cover is formed at the upper part of the fire area, the grout cover is surrounded by a curtain around the smoldering fire area, the sealing cover of the smoldering fire area is completed, an upper gas transmission channel can be sealed, and meanwhile, a grout stop cover is formed for deep drilling hole grouting;
and 4, deep drilling and grouting: a steel grouting perforated pipe is arranged in the deep drill hole, the deep drill hole is grouted, so that the grout fully fills a combustion space of a smoldering fire zone and a gap between unburned coal gangues, the deep coal gangues are subjected to grout coating to form grout coating, and finally, a fully-surrounded solid body is formed together with a curtain and a grout cover, so that fully-surrounded fire extinguishing of the smoldering fire zone is realized;
and 6, finally, sealing all the drilled holes to complete the complete surrounding fire extinguishing of the smoldering fire area, forming the treatment area into a complete consolidated body and completely extinguishing the ignition points in the coal gangue yard.
Specifically, the one-way grouting pipe comprises a grouting pipe, a plurality of layers of grouting holes arranged on the grouting pipe, steel hoops arranged on the upper side and the lower side of each layer of grouting holes and an elastic valve covering the grouting holes;
and a plurality of grouting through holes are formed in the pipe wall of the grouting floral pipe.
Specifically, in the step 1, curtain holes are arranged at equal intervals; the distance between the curtain drilling holes is set according to the porosity of the coal gangue field, the slurry with large porosity of the coal gangue field is easy to flow, and the distance between the curtain drilling holes can be large; the porosity of the coal gangue field is small, the slurry mobility is weak, and the distance between the curtain drilling holes can be small.
Specifically, the shallow drilling holes and the deep drilling holes are arranged at intervals, and the shallow drilling holes and the deep drilling holes are arranged in an array mode.
Specifically, the smallest repeating unit in the array arrangement of the shallow drilling holes and the deep drilling holes is a square or an equilateral triangle.
Specifically, the solidified curtain cooling slurry in the step 2 is prepared by taking fly ash, cement, loess and lime as raw materials according to a water-solid ratio of 1: 1.2-1: 1.5; when local high temperature is met, lime and loess are used as raw materials, and solidified curtain cooling slurry is prepared according to a water-solid ratio of 1: 1.2-1: 1.5;
grouting by using a one-way grouting pipe in a curtain drilling hole in a segmented pressurization multiple grouting mode at intervals of 2m, and finishing grouting when the pressure of a grouting orifice reaches 1.8Mpa to finish the curtain to a smoldering fire area.
Specifically, the slurry capable of being quickly solidified in the step 3 is prepared from fly ash, cement, loess, lime and an additive as raw materials according to a water-solid ratio of 1: 1.2-1: 1.5, wherein the additive is a sodium silicate aqueous solution;
grouting by using the one-way grouting pipe in the shallow drilling hole at intervals of 2m by means of segmented pressurization and multiple grouting, finishing grouting when the pressure of a grouting orifice reaches 1.8Mpa, and completing the sealing of a smoldering fire area.
Specifically, in the step 4, lime and loess are used as raw materials, slurry is prepared according to a water-solid ratio of 1: 1.2-1: 1.5, then grouting is carried out, fire is extinguished, and the temperature is reduced, and finally, fly ash, cement, loess and lime are used for preparing consolidation cooling slurry and pressure pouring is carried out along with the reduction of the temperature and the change of the grouting amount; and finishing grouting when the pressure of a grouting orifice reaches 1.8Mpa, and finishing filling and slurry coating on the coal gangue in a combustion space of a smoldering fire zone and an unburned high-temperature zone to form fire extinguishing slurry coated body so as to completely extinguish the smoldering fire zone.
Compared with the prior art, the invention has the beneficial technical effects that:
under the principle of 'treatment and temperature dynamic monitoring' synchronous operation, the invention adopts a comprehensive drilling method combining curtain drilling, deep drilling, shallow drilling and deflation and temperature measurement drilling, and matched with corresponding slurry according to the occurrence conditions of temperature and space of a smoldering fire zone, and performs targeted slurry injection to block a transverse/longitudinal gas transmission channel, fill a combustion space, wrap slurry on coal gangue, cover the fire zone through a curtain body and a cover layer, and inject slurry into the fire zone, so that the whole smoldering fire zone is fixed into a whole, thereby forming full-enclosure fire extinguishing on the fire zone, and eliminating the hidden danger of extinguishing and reburning.
The invention controls the segmented repeated pressurization of grouting, not only carries out filling and permeation grouting on a smoldering fire area, but also mainly carries out repeated splitting grouting to form a uniform curtain body and a cover layer and sufficiently slurry for coal gangue, and overcomes the defects that the traditional grouting method cannot form an effective grout stop cover and cannot uniformly fill cracks to wrap coal gangue only by means of filling and permeation grouting.
The curtain grouting and drilling method controls the extension of a fire area and plugs a transverse gas transmission channel, the shallow drilling hole in the curtain grouting and drilling hole plugs an upper gas transmission channel to form a cover layer and surround the fire area with the curtain, and the deep drilling hole is used for grouting and extinguishing fire, filling gaps in coal gangue space and grouting coal gangue. The curtain, the cover layer and the deep-drilled hole slurry package body form a complete consolidation body together, so that the problem that the smoldering fire area of the coal gangue yard is difficult to extinguish and is reburnt is thoroughly solved; the ignition point in the coal gangue yard is completely extinguished, the threat to the ecological environment is eliminated, and the land can be reused; the slurry is flexibly configured according to the characteristics of smoldering fire areas, the used materials have price advantage, not only is effective fire extinguishing realized, but also the cost is saved.
Drawings
FIG. 1 is a flow chart of a fully enclosed fire suppression project;
FIG. 2 is a schematic diagram of an engineering layout of a fully-enclosed fire suppression method;
FIG. 3 is a schematic diagram of arrangement of shallow holes and deep holes, wherein (a) is square arrangement and (b) is triangular arrangement;
FIG. 4 is a schematic structural diagram of (a) a one-way grouting pipe and (b) a grouting floral tube;
FIG. 5 is a schematic view of a curtain formed by curtain drilling and grouting;
FIG. 6 is a schematic view of a consolidation slurry cap formed by shallow borehole grouting;
FIG. 7 is a schematic illustration of a fire suppression packet slurry formed by deep borehole grouting;
FIG. 8 is a diagram of the effect of the solidification body after the complete enclosure fire extinguishing treatment.
The reference numerals have the meanings given below:
1. smoldering fire zones; 2. drilling a curtain; 3. shallow drilling; 4. deep drilling; 5. air bleeding and temperature measurement drilling; 6. arrangement of shallow drilling holes and deep drilling holes is indicated; 7. a one-way grouting pipe; 8. a grouting pipe; 9. a steel hoop; 10. grouting holes; 11. an elastic valve; 12. grouting a floral tube; 13. grouting the through hole; 14. a curtain; 15. a pulp cover; 16. the fire extinguishing slurry is wrapped with slurry; 17. fully enclosing the consolidation body.
The invention is described in detail below with reference to the drawings and the detailed description.
Detailed Description
The invention mainly aims to solve the problem that a smoldering fire area 1 in a coal gangue yard can not effectively extinguish fire, curtain drill holes 2 with the hole depth larger than the maximum buried depth of the smoldering fire area 1 are arranged at certain intervals at the periphery of the ascertained smoldering fire area 1, a one-way grouting pipe 7 is arranged in each hole (the one-way grouting pipe 7 can enable slurry to continuously flow out without backflow), the slurry is injected for multiple times by means of sectional pressurization to form a curtain 14, a transverse gas transmission channel is blocked, and the fire area is prevented from spreading outwards; shallow drilling holes 3 and deep drilling holes 4 are arranged in the curtain area at intervals, the shallow drilling holes 3 are drilled to the top of the fire area and are provided with one-way grouting pipes 7, slurry is injected for multiple times by means of segmented pressurization to form a cover layer with a certain thickness, the fire area is enclosed and covered with the curtain 14, an upper gas transmission channel can be plugged, and a slurry stopping cover 15 is formed for grouting the deep drilling holes 4; the deep drilling hole 4 penetrates through the smoldering fire area 1 and is placed into a grouting floral tube 12, fire extinguishing grout is poured, gaps of the fire area are fully filled, and coal gangue is wrapped with grout; the deflation and temperature measurement drill holes 5 are reserved in the treatment period area, high-temperature water vapor and high-temperature gas in the coal gangue field are released, the temperature change in the holes in the grouting process is monitored, and the dynamic fire extinguishing effect is mastered; and finally, sealing all the drilled holes to complete the complete surrounding fire extinguishing of the smoldering fire area 1 and form a complete consolidation body in the treatment area, so that the internal fire points of the coal gangue yard are completely extinguished, the threat of the fire points to the ecological environment is eliminated, and the land can be recycled.
Specifically, the method comprises the following steps:
and 4, grouting in a deep drilling hole 4: a steel grouting floral tube 12 is arranged in the deep drilling hole 4, the deep drilling hole 4 is grouted, so that grout is fully filled in a combustion space of the smoldering fire zone 1 and a gap between unburned coal gangues, the deep coal gangues are grouted to form a grout body, and finally, the grout body, a curtain 14 and a grout cover 15 form a full-enclosure solid body 17, so that full-enclosure fire extinguishing of the smoldering fire zone 1 is realized;
and step 6, finally, sealing all the drilled holes to complete the complete surrounding fire extinguishing of the smoldering fire area 1, forming a complete consolidated body in the treatment area and completely extinguishing the ignition points in the coal gangue yard.
As shown in fig. 4, the unidirectional grouting pipe 7 includes a grouting pipe 8, multiple layers of grouting holes 10 formed in the grouting pipe 8, steel hoops 9 formed on the upper and lower sides of each layer of grouting hole 10, and an elastic valve 11 covering the grouting holes 10, specifically, in this embodiment, the elastic valve 11 is a rubber sleeve, when grouting, grout can flow out of the grouting holes 10 and prop open the rubber sleeve, and when grouting is not performed, the rubber sleeve blocks the grouting holes 10, thereby achieving unidirectional grouting; the wall of the grouting perforated pipe 12 is provided with a plurality of grouting through holes 13.
In the step 1, curtain drilling holes 2 are distributed at equal intervals; the distance between the curtain drill holes 2 is set according to the porosity of the coal gangue field, the slurry with large porosity of the coal gangue field is easy to flow, and the distance between the curtain drill holes 2 can be large; the porosity of the coal gangue field is small, the slurry flowability is weak, and the distance between the curtain drill holes 2 can be small.
The shallow drilling holes 3 and the deep drilling holes 4 are arranged at intervals, and the shallow drilling holes 3 and the deep drilling holes 4 are arranged in an array mode. The smallest repeating unit in the array arrangement of the shallow holes 3 and the deep holes 4 is a square or an equilateral triangle, and as shown in fig. 3, the shallow holes and the deep holes are arranged in a schematic view, (a) is in a square arrangement, and (b) is in a triangular arrangement.
The solidified curtain cooling slurry in the step 2 is prepared from fly ash, cement, loess and lime as raw materials according to a water-solid ratio of 1: 1.2-1: 1.5; when local high temperature is met, lime and loess are used as raw materials, and solidified curtain cooling slurry is prepared according to a water-solid ratio of 1: 1.2-1: 1.5;
grouting by the unidirectional grouting pipe 7 in the curtain drilling hole 2 at intervals of 2m by adopting a segmented pressurization multiple grouting mode, and finishing grouting when the pressure of a grouting orifice reaches 1.8Mpa to finish the curtain 14 of the smoldering fire area 1.
The slurry capable of being quickly solidified in the step 3 is prepared from fly ash, cement, loess, lime and an additive according to a water-solid ratio of 1: 1.2-1: 1.5, wherein the additive is a sodium silicate aqueous solution;
and grouting by the one-way grouting pipe 7 in the shallow drilling hole 3 at intervals of 2m by adopting a segmented pressurization multiple grouting mode, and finishing grouting when the pressure of a grouting orifice reaches 1.8Mpa to finish the sealing of the smoldering fire area 1.
In the step 4, lime and loess are used as raw materials, grout is prepared according to the water-solid ratio of 1: 1.2-1: 1.5, then grouting is carried out, fire is extinguished, the temperature is reduced, and finally, fly ash, cement, loess and lime are used for preparing consolidation cooling grout, and pressurized pouring is carried out; and finishing grouting when the pressure of a grouting orifice reaches 1.8Mpa, and finishing filling and slurry coating on coal gangue in a combustion space of the smoldering fire area 1 and an unburned high-temperature area to form fire extinguishing slurry coated body 16 so as to completely extinguish the smoldering fire area 1.
The present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention fall within the protection scope of the present invention. The present invention will be described in further detail with reference to examples.
Example 1:
the embodiment provides a method for controlling fire extinguishing in a fully-enclosed smoldering fire area 1 of a coal gangue yard, as shown in fig. 1 to 3, a curtain drill hole 2 is arranged at the periphery of the smoldering fire area 1 of the coal gangue yard, a one-way grouting pipe 7 is arranged, and a curtain 14 is formed by segmented pressurization and multiple grouting; shallow drilling holes 3 and deep drilling holes 4 are arranged at intervals in a curtain area defined by the curtain drilling holes 2, a one-way grouting pipe 7 is arranged in the shallow drilling holes 3, a slurry cover 15 is formed by segmented pressurization and multiple times of grouting, and the flame area is enclosed and covered by the curtain 14; a grouting floral tube 12 is arranged in the deep drill hole 4, and the gaps of the fire area are fully filled by grouting to complete slurry coating of the coal gangue; and a gas release and temperature measurement drill hole 5 is reserved in the curtain area during the treatment period; finally, sealing all the drilled holes to complete the complete surrounding fire extinguishing of the smoldering fire area 1 and form a complete consolidation body in the treatment area to completely extinguish the fire points in the coal gangue yard; the depth of the curtain drilling hole 2 and the deep drilling hole 4 needs to be drilled below the bottom of the smoldering fire area 1, and the purpose of controlling the bottom of the fire area can be achieved while grouting the curtain and extinguishing fire; the shallow bore hole 3 is drilled near the top of the smoldering fire zone 1 and grouted to form a consolidated grout cap 15 layer which closes the smoldering fire zone 1 and encloses the fire zone together with the curtain 14.
And measuring and positioning each drill hole according to the arrangement requirement of the drill holes. Firstly, constructing a series of curtain drilling holes 2 with odd numbers (for convenience of expression, the drilling holes are numbered in figure 5, W represents the curtain drilling holes 2), implanting a steel one-way grouting pipe 7 (as the reference numeral 7) to avoid slurry backflow; preparing solidified curtain cooling slurry by using fly ash, cement, loess and lime raw materials in a ratio of 0.5:0.3:0.1:0.1 according to a water-solid ratio of 1: 1.2-1: 1.5; if local high temperature is met, mixed slurry of lime and loess with the ratio of 0.2:0.8 is adopted, grouting is carried out, and fire is extinguished, and the temperature is reduced for consolidation; secondly, constructing a two-sequence curtain drilling hole 2 with an even number, implanting a steel unidirectional grouting pipe 7, and grouting according to the materials and the proportion. Grouting the unidirectional grouting pipe 7 by adopting a segmented pressurization multiple grouting mode at intervals of 2m, wherein in other embodiments, the minimum segment distance can reach 0.2m, grouting can be carried out for 8-10 times according to the stratum condition, and the segment distance can be set according to the stratum condition; when the pressure of the grouting orifice reaches 1.8Mpa, grouting is finished, the curtain 14 of the smoldering fire area 1 is finished, the fire area is prevented from spreading to the periphery, and the transverse gas transmission channel is blocked.
After grouting of the curtain drilling hole 2 is finished, a plurality of air-bleeding and temperature-measuring monitoring drilling holes 5 are properly arranged in the curtain area according to the range of the smoldering fire area 1, the hole is drilled into the inner part or the bottom of the fire area and implanted with a perforated pipe, heat, water vapor and gas in the fire area are released, the dynamic temperature change condition in the construction process is monitored, and grouting plugging is carried out when the construction is finished.
A first-order grouting shallow drilling hole 3 with odd construction numbers (for convenience of expression, drilling holes are numbered in the attached figure 6, Q represents a shallow drilling hole 3) is drilled to the top of a fire area, and a steel unidirectional grouting pipe 7 is implanted; fly ash, cement, loess, lime and an additive are adopted to prepare slurry, and the mixture ratio is that the fly ash: loess: lime: cement: additive agent
Preparing a slurry capable of being rapidly solidified, wherein the additive has the function of accelerating the coagulation of the slurry to form a slurry cover 15 covering a fire zone, and the ratio of water to solid is 1: 1.2-1: 1.5 (the additive in the embodiment is a foam net structure formed by mixing two additives so as to accelerate the coagulation of the slurry); and secondly, constructing a secondary shallow drilling hole 3 with an even number, implanting a one-way grouting pipe 7, and grouting according to the materials and the proportion. Grouting the unidirectional grouting pipe 7 by adopting a segmented pressurization multiple grouting mode at intervals of 2m, wherein in other embodiments, the minimum segment distance can reach 0.2m, grouting can be carried out for 8-10 times according to the stratum condition, and the segment distance can be set according to the stratum condition; and finishing grouting when the pressure of a grouting orifice reaches 1.8Mpa, finishing the cover sealing of the smoldering fire area 1, plugging an upper gas transmission channel, and simultaneously forming a grout stop cover 15 for deep hole grouting.
A sequence of deep drilling holes 4 with odd construction numbers (for convenience of expression, the drilling holes are numbered in figure 7, and S represents the deep drilling holes 4) are implanted into the steel flower tubes; in a smoldering high-temperature fire area, lime and loess mixed slurry with the ratio of 0.2:0.8 is adopted, the water-solid ratio is 1: 1.2-1: 1.5, grouting is firstly carried out for extinguishment and temperature reduction, and the solidification and temperature reduction slurry can be prepared by adopting fly ash, cement, loess and lime with the ratio of 0.5:0.3:0.1:0.1 along with the reduction of the temperature and the change of the grouting amount, and then pressurized pouring is carried out; and then constructing a secondary deep drilling hole 4 with an even number, implanting a steel perforated pipe, and preparing slurry grouting according to the materials and the proportion. And finishing grouting when the pressure of a grouting orifice reaches 1.8Mpa, and finishing filling and slurry coating on coal gangue in a combustion space of a smoldering zone and a high-temperature zone which is not burnt to form fire extinguishing slurry coated body 16 so as to completely extinguish the smoldering fire zone 1.
As can be seen from the above description, the fire extinguishing slurry bag 16 formed by grouting in the deep drilling hole 4 is surrounded by the curtain wall formed by grouting in the curtain, the slurry cover 15 formed by grouting in the shallow drilling hole 3 and the back cover formed by the slurry in the bottoms of the deep drilling hole 4 and the curtain drilling hole 2, as shown in FIG. 8, a fully-surrounded or fully-surrounded solid body 17 for the fire area is formed, and the problem that the smoldering fire area 1 in the coal gangue yard is difficult to extinguish fire and is re-combusted is solved.
Claims (9)
1. A totally-enclosed fire extinguishing treatment method for a smoldering fire area of a coal gangue field is characterized in that curtain drill holes are arranged at the periphery of the smoldering fire area of the coal gangue field, one-way grouting pipes are arranged in the curtain drill holes, and grouting is carried out for multiple times by means of segmented pressurization to form curtains; shallow drilling holes and deep drilling holes are arranged in a curtain area surrounded by the curtain drilling holes at intervals, a one-way grouting pipe is arranged in each shallow drilling hole, and grouting is performed for multiple times by means of segmented pressurization to form a grout cover which surrounds and covers the fire area with the curtain; placing a grouting perforated pipe in the deep drill hole, and fully filling gaps in a fire area by grouting to finish the slurry coating of the coal gangue; and keeping the air-bleed and temperature-measuring drill hole in the curtain area during the treatment period; finally, sealing all the drilled holes to complete the complete surrounding fire extinguishing of the smoldering fire area and form a complete consolidation body in the treatment area to completely extinguish the fire points in the coal gangue yard; the hole depth of the curtain drilling hole is larger than the maximum burial depth of the smoldering fire area, the shallow drilling hole is drilled to the top of the smoldering fire area, and the deep drilling hole penetrates through the smoldering fire area.
2. The fully-enclosed fire extinguishing management method for the smoldering fire area of the coal gangue yard as defined in claim 1, comprising the following steps:
step 1, arranging drill holes: arranging curtain drilling holes around the smoldering fire area to form a curtain area, and arranging shallow drilling holes and deep drilling holes at intervals in the curtain area;
step 2, curtain drilling and grouting: a steel one-way grouting pipe is arranged in the curtain drilling hole, and consolidated curtain cooling slurry is injected for multiple times by means of segmented pressurization until a uniform curtain is formed on a smoldering fire area to block a transverse gas transmission channel and prevent the smoldering fire area from spreading to the periphery;
and 3, shallow drilling grouting: a steel one-way grouting pipe is arranged in the shallow drilling hole, grout which can be quickly solidified is injected for multiple times by means of segmented pressurization, a grout cover is formed at the upper part of the fire area, the grout cover is surrounded by a curtain around the smoldering fire area, the sealing cover of the smoldering fire area is completed, an upper gas transmission channel can be sealed, and meanwhile, a grout stop cover is formed for deep drilling hole grouting;
and 4, deep drilling and grouting: a steel grouting perforated pipe is arranged in the deep drill hole, the deep drill hole is grouted, so that the grout fully fills a combustion space of a smoldering fire zone and a gap between unburned coal gangues, the deep coal gangues are subjected to grout coating to form grout coating, and finally, a fully-surrounded solid body is formed together with a curtain and a grout cover, so that fully-surrounded fire extinguishing of the smoldering fire zone is realized;
step 5, air bleeding and temperature monitoring: during the treatment period, the inside of the curtain area is kept with the deflation and temperature measurement drill holes, so that the heat, high-temperature water vapor and high-temperature gas inside the coal gangue field are released, the temperature is continuously measured in the holes, and the fire extinguishing effect is mastered by comparing the temperature reduction degree;
and 6, finally, sealing all the drilled holes to complete the complete surrounding fire extinguishing of the smoldering fire area, forming the treatment area into a complete consolidated body and completely extinguishing the ignition points in the coal gangue yard.
3. The coal gangue yard smoldering fire area full-surrounding fire extinguishing management method as defined in claim 1, wherein said one-way grouting pipe comprises a grouting pipe, a plurality of layers of grouting holes provided on the grouting pipe, steel hoops provided on upper and lower sides of each layer of grouting hole, and an elastic valve covering the grouting holes;
and a plurality of grouting through holes are formed in the pipe wall of the grouting floral pipe.
4. The fully-enclosed fire extinguishing management method for the smoldering fire area of the coal gangue yard as defined in claim 2, wherein in the step 1, curtain drilling holes are arranged at equal intervals; the distance between the curtain drilling holes is set according to the porosity of the coal gangue field, the slurry with large porosity of the coal gangue field is easy to flow, and the distance between the curtain drilling holes can be large; the porosity of the coal gangue field is small, the slurry mobility is weak, and the distance between the curtain drilling holes can be small.
5. The coal gangue yard smoldering fire area full-surrounding fire extinguishing management method as defined in claim 2, wherein the shallow drilling holes and the deep drilling holes are arranged at intervals and are arranged in an array.
6. The coal gangue yard smoldering fire area full-surrounding fire extinguishing management method as defined in claim 5, wherein the smallest repeating unit in the array arrangement of the shallow drilling holes and the deep drilling holes is a square or an equilateral triangle.
7. The fully-surrounded fire extinguishing treatment method for the smoldering fire area of the coal gangue yard as defined in claim 2, wherein the consolidated curtain cooling slurry in the step 2 is prepared by using fly ash, cement, loess and lime as raw materials according to a water-solid ratio of 1: 1.2-1: 1.5; when local high temperature is met, lime and loess are used as raw materials, and solidified curtain cooling slurry is prepared according to a water-solid ratio of 1: 1.2-1: 1.5;
grouting by using a one-way grouting pipe in a curtain drilling hole in a segmented pressurization multiple grouting mode at intervals of 2m, and finishing grouting when the pressure of a grouting orifice reaches 1.8Mpa to finish the curtain to a smoldering fire area.
8. The fully-enclosed fire extinguishing treatment method for the smoldering fire area of the coal gangue yard as defined in claim 2, wherein the slurry capable of being rapidly solidified in the step 3 is prepared by using fly ash, cement, loess, lime and an additive as raw materials according to a water-solid ratio of 1: 1.2-1: 1.5, wherein the additive is a sodium silicate aqueous solution;
grouting by using the one-way grouting pipe in the shallow drilling hole at intervals of 2m by means of segmented pressurization and multiple grouting, finishing grouting when the pressure of a grouting orifice reaches 1.8Mpa, and completing the sealing of a smoldering fire area.
9. The fully-enclosed fire extinguishing treatment method for the smoldering fire area of the coal gangue yard as defined in claim 2, wherein in the step 4, lime and loess are firstly adopted as raw materials, grout is prepared according to the water-solid ratio of 1: 1.2-1: 1.5, then grouting is carried out for fire extinguishing and temperature reduction, and with the reduction of temperature and the change of grouting amount, finally, fly ash, cement, loess and lime are adopted for preparing consolidation temperature reduction grout, and pressurized pouring is carried out; and finishing grouting when the pressure of a grouting orifice reaches 1.8Mpa, and finishing filling and slurry coating on the coal gangue in a combustion space of a smoldering fire zone and an unburned high-temperature zone to form fire extinguishing slurry coated body so as to completely extinguish the smoldering fire zone.
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