CN116122815B - Safe recovery evaluation method and system for working face shortened fault waterproof coal pillar - Google Patents
Safe recovery evaluation method and system for working face shortened fault waterproof coal pillar Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 128
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 117
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- E21C41/00—Methods of underground or surface mining; Layouts therefor
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Abstract
The application provides a safe recovery evaluation method and system for a fault waterproof coal pillar with a shortened working face. Grouting reinforcement is carried out on a grouting reinforcement area partition of a working face shortened fault waterproof coal pillar, drilling unit water inflow after grouting reinforcement is carried out on the grouting reinforcement area, the maximum damage depth of a bottom plate mining, the maximum upward crack expansion height of a water-bearing layer top surface and the maximum upward low resistivity height of a water-bearing layer top surface in a hydrological observation hole applied in the mining range of the working face shortened fault waterproof coal pillar are obtained, and after grouting reinforcement is carried out on the grouting reinforcement area, the water burst coefficient of the working face shortened fault waterproof coal pillar is corrected according to a formula; and according to the comparison result of the corrected water burst coefficient and the preset safety value, carrying out safety stoping on the fault waterproof coal pillar with shortened working face. Therefore, the extraction guidance of the shortened fault waterproof coal pillar is more reasonable and accurate through the water burst coefficient, and the extraction rate of the shortened fault waterproof coal pillar is further effectively improved.
Description
Technical Field
The application relates to the technical field of coal mine safety exploitation, in particular to a safe stoping evaluation method and system for a fault waterproof coal pillar with a shortened working face.
Background
Along with the gradual and deep exploitation of coal resources, the coal seam bottom plates in many exploitation areas are increasingly seriously influenced by the Ort ash water, and particularly under the condition of complex geological conditions of the coal seam, a large number of waterproof coal pillars need to be reserved on a working face when the working face encounters faults so as to ensure the exploitation safety, so that the resource waste is greatly caused.
In order to solve the problem, when the mining of the fault waterproof coal pillars is shortened, a method of grouting and reinforcing a bottom plate is mainly adopted, the water inrush coefficient is utilized to guide the mining of the fault waterproof coal pillars, and the mining rate is improved. However, in the current technology, the water bursting number only relates to two parameters of water pressure of an aquifer and thickness of a water-resisting layer of a bottom plate, so that the exploitation guidance of the shortened fault waterproof coal pillar is not reasonable.
Thus, there is a need to provide a solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The purpose of the application is to provide a safe recovery evaluation method and a safe recovery evaluation system for a fault waterproof coal pillar with a shortened working face, so as to solve or alleviate the problems in the prior art.
In order to achieve the above object, the present application provides the following technical solutions:
the application provides a safe stoping evaluation method of a working face shortened fault waterproof coal pillar, which comprises the steps of carrying out grouting reinforcement on a grouting reinforcement area partition of the working face shortened fault waterproof coal pillar, and obtaining drilling unit water inflow q and a bottom plate mining maximum damage depth H after grouting reinforcement of the grouting reinforcement area and in stoping process 1 Maximum height H of upward fracture expansion of aquifer top surface 2 And the maximum height H of the upper low resistivity of the top surface of the water-containing layer in the hydrological observation hole which is applied in the exploitation range of the working surface shortened fault waterproof coal pillar 3 The method comprises the steps of carrying out a first treatment on the surface of the According to the formula:
correcting a water bursting coefficient T of the working face shortened fault waterproof coal pillar in the stoping process after grouting reinforcement in the grouting reinforcement area; wherein k is the water burst safety coefficient,
h is the distance from the bottom plate to the aquifer; p is the water pressure of the water-bearing layer of the bottom plate; q is the water inflow of a drilling unit before grouting reinforcement; according to the corrected water inrush coefficient and a preset safety value T Label (C) And (3) carrying out safe stoping on the fault waterproof coal pillar with shortened working face.
Preferably, the unit water inflow q of the drilled hole after grouting reinforcement in the grouting reinforcement area and in the stoping process is obtained, specifically: and Shi Dashui observation holes in the mining range of the fault waterproof coal pillar are shortened on the working face, and when the mining is carried out to the corresponding hydrological observation hole area, the drilling unit water inflow q in the mining process after grouting reinforcement of the grouting reinforcement area is obtained.
Preferably, the water inrush coefficient after correction and a preset safety value T Label (C) The safety recovery of the face shortened fault waterproof coal pillar comprises: in response to k.epsilon.0, 1]And T is less than or equal to T Label (C) Mining the working face shortened fault waterproof coal pillar; in response to k>T is 1 and is less than or equal to T Label (C) The bottom plate is drained until k is E (0, 1]And T is less than or equal to T Label (C) Mining the fault waterproof coal pillar shortened by the working face; in response to k>1 and T>T Label (C) After the bottom plate is drained, grouting and reinforcing are carried out on the bottom plate until k is E (0, 1)]And T is less than or equal to T Label (C) And mining the fault waterproof coal pillar shortened by the working face.
Preferably, the number of the hydrologic observation holes is determined according to the width of the working face shortened fault waterproof coal pillar, and the number of the hydrologic observation holes is [6,8].
Preferably, the grouting reinforcement area includes: a first region, a second region, and a third region; the first area is a bottom plate geological weak area of the working face shortened fault waterproof coal pillar; the second area is an area of the working surface, in which the thickness of the junction of the bottom plate breaking area of the fault waterproof coal pillar and the top breaking area of the water-bearing layer is smaller than the thickness of the stratum with the maximum strength in the bottom plate stratum; the third area is a communication area between a bottom plate damage area of the working face shortened fault waterproof coal pillar and a top damage area of the aquifer.
Preferably, determining the first region based on geological drilling or resistivity of the mining region of the face shortened fault waterproof coal pillar; and carrying out a stope value test on the working face shortened fault waterproof coal pillar based on the established stope geological model of the working face shortened fault waterproof coal pillar, and dividing the second area and the third area.
The embodiment of the application also provides a safe stoping system for a fault waterproof coal pillar of a working face shortening, which comprises: the parameter acquisition unit is configured to perform grouting reinforcement on a grouting reinforcement area of the working face shortened fault waterproof coal pillar, and acquire drilling unit water inflow q and the maximum destruction depth H of bottom plate mining after grouting reinforcement in the grouting reinforcement area and in the stoping process 1 Maximum height H of upward fracture expansion of aquifer top surface 2 And the maximum height H of the upper low resistivity of the top surface of the water-containing layer in the hydrological observation hole which is applied in the exploitation range of the working surface shortened fault waterproof coal pillar 3 The method comprises the steps of carrying out a first treatment on the surface of the A coefficient correction unit configured to:
correcting a water bursting coefficient T of the working face shortened fault waterproof coal pillar in the stoping process after grouting reinforcement in the grouting reinforcement area; wherein k is the water burst safety coefficient,
h is the distance from the bottom plate to the aquifer; p is the water pressure of the water-bearing layer of the bottom plate; q is grouting reinforcementThe water inflow of the drilling unit at the front; a stope guiding unit configured to calculate a water inrush coefficient according to the corrected water inrush coefficient and a preset safety value T Label (C) And (3) carrying out safe stoping on the fault waterproof coal pillar with shortened working face.
The beneficial effects are that:
in the safe stoping evaluation method for the working face shortened fault waterproof coal pillar provided by the embodiment of the application, firstly, grouting reinforcement is carried out on a grouting reinforcement area of the working face shortened fault waterproof coal pillar, and drilling unit water inflow q and the maximum destruction depth H of bottom plate mining in the stoping process after grouting reinforcement of the grouting reinforcement area are obtained 1 Maximum height H of upward fracture expansion of aquifer top surface 2 And the maximum height H of the upper low resistivity of the top surface of the water-containing layer in the hydrological observation hole which is applied in the exploitation range of the working surface shortened fault waterproof coal pillar 3 The method comprises the steps of carrying out a first treatment on the surface of the Then, according to the formula:
correcting the water bursting coefficient T of the fault waterproof coal pillar by the working face in the stoping process after grouting reinforcement in the grouting reinforcement area; wherein k is a water burst safety coefficient, k=q/Q, and H is the distance from the bottom plate to the aquifer; p is the water pressure of the water-bearing layer of the bottom plate; q is the water inflow of a drilling unit before grouting reinforcement; finally, according to the corrected water inrush coefficient and a preset safety value T Label (C) And (3) carrying out safe stoping on the fault waterproof coal pillar with shortened working face.
Therefore, when the fault waterproof coal pillar is shortened, the water inrush quantity is accurately corrected, so that the extraction guidance of the shortened fault waterproof coal pillar through the water inrush quantity is more reasonable and accurate, the rationality of the extraction guidance of the shortened fault waterproof coal pillar is improved, and the extraction rate of the shortened fault waterproof coal pillar is further effectively improved.
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The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. Wherein:
fig. 1 is a schematic flow chart of a safe recovery evaluation method for a face shortened fault waterproof coal pillar according to some embodiments of the present application;
FIG. 2 is a schematic illustration of a division of a second region provided in accordance with some embodiments of the present application;
fig. 3 is a schematic structural diagram of a safe recovery evaluation system for a face shortened fault waterproof coal pillar according to some embodiments of the present application.
Detailed Description
The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. Various examples are provided by way of explanation of the present application and not limitation of the present application. Indeed, it will be apparent to those skilled in the art that modifications and variations can be made in the present application without departing from the scope or spirit of the application. For example, features illustrated or described as part of one embodiment can be used on another embodiment to yield still a further embodiment. Accordingly, it is intended that the present application include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
The applicant researches find that in the current method for improving the exploitation rate of the fault waterproof coal pillar by grouting and reinforcing the bottom plate, on one hand, when grouting and reinforcing the bottom plate, the lack of a specific grouting area often causes huge workload and wastes time and labor; on the other hand, when the water inrush coefficient is used for guiding the exploitation of the shortened fault waterproof coal pillar, the water inrush coefficient only relates to the water pressure of the aquifer and the thickness of the water-resisting layer of the bottom plate, and the consideration of key parameters such as water inflow and the like is lacked, so that the exploitation guiding of the shortened fault waterproof coal pillar is lacked in rationality.
Based on the above, the applicant provides a safe stoping evaluation method for a working face shortened fault waterproof coal pillar, which is characterized in that grouting areas are reasonably divided, so that the targeted grouting reinforcement of grouting reinforcement areas is realized, and the grouting reinforcement efficiency is improved; on the other hand, the water inrush coefficient is corrected through key parameters such as water inflow and the like, so that the water inrush coefficient is more reasonable and accurate for shortening the exploitation guidance of the fault waterproof coal pillar.
As shown in fig. 1, the safe recovery evaluation method of the face shortened fault waterproof coal pillar comprises the following steps:
and S101, grouting reinforcement is carried out on the grouting reinforcement area partition of the working face shortened fault waterproof coal pillar.
Wherein, grouting reinforcement area includes: a first region, a second region, and a third region; the first area is a bottom plate geological weak area of a working face shortened fault waterproof coal pillar; the second area is an area of the working surface, which shortens the thickness of the junction of the bottom plate breaking area of the fault waterproof coal pillar and the top breaking area of the water-bearing layer, and is smaller than the thickness of the stratum with the maximum strength in the bottom plate stratum; the third area is a communication area between the bottom plate damage area of the working face shortened fault waterproof coal pillar and the top damage area of the water-bearing layer.
In this application, a first zone is determined based on geological drilling or resistivity of a mining area of a face shortened fault waterproof coal pillar. Specifically, geological drilling is carried out by shortening the mining area of the fault waterproof coal pillar on the working surface, and thin rock stratum and weak rock stratum in the area are determined; or detecting the mining area of the face shortened fault waterproof coal pillar by using a geological radar to determine a geological weak area. In this region, the water in the bottom aquifer is raised to the aquifer top rock layer as compared with the normal stratum, the region having a relatively lower resistivity than the non-hydrated state is a filled water region, and the region having a relatively higher resistivity is a hole region, depending on the change in resistivity. In addition, the geological weakness of the floor can be determined by borehole television detection.
And carrying out a stoping numerical test on the working face shortened fault waterproof coal pillar based on the stoping geological model of the established working face shortened fault waterproof coal pillar, and dividing a second area and a third area. Specifically, according to geological survey and rock stratum physical and mechanical parameters of the position of the working face shortened fault waterproof coal pillar, a stoping geological model of the working face shortened fault waterproof coal pillar is established, numerical analysis of the working face shortened fault waterproof coal pillar is carried out, and an expansion distribution rule of a bottom plate plastic region and a water-bearing layer top plastic region is determined.
That is, the thickness of the junction between the bottom plate breaking area and the top breaking area of the water-bearing layer is smaller than the thickness of the rock layer with the maximum strength in the bottom plate rock layer, and the division of the communication area between the bottom plate breaking area and the top breaking area of the water-bearing layer is determined through numerical calculation, and the division is mainly based on the distribution range and the communication condition of the plastic area in the recovery numerical test of the recovery geological model; dividing the region where the plastic region does not occur into a second region as shown in fig. 2; the region where the plastic regions communicate is divided into a third region.
And S102, shortening Shi Dashui observation holes in the mining range of the fault waterproof coal pillar on the working face, and acquiring drilling unit water inflow q after grouting reinforcement in the grouting reinforcement area and in the stoping process when stoping to the corresponding hydrological observation hole area.
The number of the hydrographic observation holes is determined according to the width of the fault waterproof coal pillar shortened by the working face, specifically, hydrogeological drilling holes are drilled at intervals of 20 meters according to the width of the fault waterproof coal pillar, and the number of the hydrographic observation holes is [6,8].
Step S103, obtaining the maximum damage depth H of the bottom plate mining in the stoping process after grouting reinforcement in the grouting reinforcement area 1 Maximum height H of upward fracture expansion of aquifer top surface 2 And the maximum height H of the upper low resistivity of the top surface of the water-containing layer in the hydrological observation hole 3 。
Wherein, the maximum damage depth H of the bottom plate mining 1 The maximum depth of downward expansion of the plastic region of the lower bottom plate is influenced by mining; maximum height H of upward fracture expansion of aquifer top surface 2 The maximum height of the upward expansion of the plastic zone of the upper strata of the lower aquifer is affected for mining. H 1 、H 2 All are obtained by numerical simulation of a stoping geological model, and the maximum height H of the upward low resistivity of the top surface of the water-containing layer in the hydrological observation hole 3 The maximum height of upward expansion of the fracture of the top rock formation of the aquifer is obtained by adopting the resistivity detection technology.
In the application, grouting pressure adopted when pre-grouting is carried out in a geological weak area of the bottom plate is 1-2 MPa, and the grout is cement grout with a water-cement ratio of 0.5:1; the grouting pressure adopted in the junction of the bottom plate breaking area and the top breaking area of the water-bearing layer is 1-2 MPa, and the slurry is cement slurry with the water-cement ratio of 0.5:1-0.7:1.
Step S104, according to the formula:
correcting the water bursting coefficient T of the fault waterproof coal pillar by the working face in the stoping process after grouting reinforcement in the grouting reinforcement area; wherein k is the water burst safety coefficient,
h is the distance from the bottom plate to the aquifer; p is the water pressure of the water-bearing layer of the bottom plate; q is the water inflow of the drilling unit before grouting reinforcement.
In the traditional technology, the water inrush coefficient is utilized to guide the exploitation of the shortened fault waterproof coal pillar, when the exploitation rate is improved, the water inrush coefficient only relates to two parameters of water pressure of a water-bearing layer and thickness of a water-resisting layer of a bottom plate, on one hand, the determination of the thickness of the water-bearing layer of the bottom plate lacks scientificity, and on the other hand, the influence of water inflow is not considered, so that the exploitation guide of the shortened fault waterproof coal pillar lacks rationality. Based on the defects, the water inrush system is corrected, firstly, the thickness of the water-resisting layer of the bottom plate is considered, and meanwhile, the damage depth of the bottom plate and the filling water height of the top of the water-bearing layer are considered, so that the determination of the thickness of the water-resisting layer is more scientific and reasonable and safer; secondly, aiming at the water inflow, carrying out dimensionless comparison with the water inflow in the initial state, and judging whether dewatering is needed in the process of guiding the stope fault waterproof coal pillar.
Step S105, according to the corrected water inrush coefficient and a preset safety value T Label (C) And (3) carrying out safe stoping on the fault waterproof coal pillar with shortened working face.
In the present application,in response to k.epsilon.0, 1]And T is less than or equal to T Label (C) Mining the fault waterproof coal pillar with shortened working face; in response to k>T is 1 and is less than or equal to T Label (C) The bottom plate is drained until k is E (0, 1]And T is less than or equal to T Label (C) Mining the fault waterproof coal pillar with shortened working face; in response to k>1 and T>T Label (C) After the bottom plate is drained, grouting and reinforcing are carried out on the bottom plate until k is E (0, 1)]And T is less than or equal to T Label (C) And (5) mining the fault waterproof coal pillar with shortened working face.
Specifically, in response to k ε (0, 1]And T is less than or equal to T Label (C) The water burst risk is avoided in the process of stoping the fault waterproof coal pillar, and the water burst amount is not threatening to stope; in response to k>T is 1 and is less than or equal to T Label (C) The water burst danger is avoided in the process of stoping the fault waterproof coal pillar, but the water burst is larger, the normal stoping of a working face is influenced, the bottom plate needs to be drained until k is smaller than (0, 1)]And T is less than or equal to T Label (C) Mining the fault waterproof coal pillar with shortened working face; in response to k>1 and T>T Label (C) The water burst danger in the process of stoping the fault waterproof coal pillar is shown, the water burst quantity is large, the normal stoping of a working face is influenced, the bottom plate needs to be firstly drained until k is smaller than (0, 1)]The threat of water inflow to exploitation is eliminated, then grouting and reinforcing are carried out on the bottom plate, and the thickness and the strength of the water-resisting layer are increased until T is less than or equal to T Label (C) Eliminating the water burst danger, and on the basis, mining the fault waterproof coal pillar on the working face.
Through the stoping method, when the mining of the fault waterproof coal pillar is shortened, the water inrush quantity is accurately corrected, so that the stoping guidance of the fault waterproof coal pillar is more reasonable and accurate through the water inrush quantity, the rationality of the stoping guidance of the fault waterproof coal pillar is improved, and the stoping rate of the fault waterproof coal pillar is further effectively improved.
The embodiment of the application also provides a safe stoping evaluation system for the working face shortened fault waterproof coal pillar, as shown in fig. 3, the safe stoping system for the working face shortened fault waterproof coal pillar comprises:
a parameter acquisition unit 301 configured to inject the face shortened fault waterproof coal pillarGrouting reinforcement is carried out on the grouting reinforcement area, and the drilling unit water inflow q and the maximum damage depth H of the bottom plate mining are obtained after grouting reinforcement of the grouting reinforcement area and in the stoping process 1 Maximum height H of upward fracture expansion of aquifer top surface 2 And the maximum height H of the upper low resistivity of the top surface of the water-containing layer in the hydrological observation hole which is applied in the exploitation range of the working surface shortened fault waterproof coal pillar 3 ；
A coefficient correction unit 302 configured to:
correcting a water bursting coefficient T of the working face shortened fault waterproof coal pillar in the stoping process after grouting reinforcement in the grouting reinforcement area;
wherein k is the water burst safety coefficient,
h is the distance from the bottom plate to the aquifer; p is the water pressure of the water-bearing layer of the bottom plate; q is the water inflow of a drilling unit before grouting reinforcement;
a stope guiding unit 303 configured to calculate a water inrush coefficient according to the corrected water inrush coefficient and a preset safety value T Label (C) And (3) carrying out safe stoping on the fault waterproof coal pillar with shortened working face.
The working face shortened fault waterproof coal pillar safety stoping evaluation system provided by the embodiment of the application can realize the steps and the flow of the working face shortened fault waterproof coal pillar safety stoping method of any embodiment, and achieve the same technical effects, and are not repeated here.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (6)
1. A safe recovery evaluation method for a working face shortened fault waterproof coal pillar is characterized by comprising the following steps:
grouting reinforcement is carried out on the grouting reinforcement area partition of the working face shortened fault waterproof coal pillar, and drilling unit water inflow q and the maximum destruction depth H of the bottom plate mining are obtained after grouting reinforcement of the grouting reinforcement area and in the stoping process 1 Maximum height H of upward fracture expansion of aquifer top surface 2 And the maximum height H of the upper low resistivity of the top surface of the water-containing layer in the hydrological observation hole which is applied in the exploitation range of the working surface shortened fault waterproof coal pillar 3 ；
According to the formula:
correcting a water bursting coefficient T of the working face shortened fault waterproof coal pillar in the stoping process after grouting reinforcement in the grouting reinforcement area;
wherein k is the water burst safety coefficient,
h is the distance from the bottom plate to the aquifer; p is the water pressure of the water-bearing layer of the bottom plate; q is the water inflow of a drilling unit before grouting reinforcement;
according to the corrected water inrush coefficient and a preset safety value T Label (C) The safety recovery is carried out on the fault waterproof coal pillar with shortened working face;
the water inrush coefficient after correction and a preset safety value T Label (C) The safety recovery of the face shortened fault waterproof coal pillar comprises:
in response to k.epsilon.0, 1]And T is less than or equal to T Label (C) Mining the working face shortened fault waterproof coal pillar;
in response to k > 1 and T.ltoreq.T Label (C) The bottom plate is drained until k is E (0, 1]And T is less than or equal to T Label (C) Mining the fault waterproof coal pillar shortened by the working face;
in response to k > 1 and T > T Label (C) After the bottom plate is drained, grouting and reinforcing are carried out on the bottom plate until k is E (0, 1)]And T is less than or equal to T Label (C) And mining the fault waterproof coal pillar shortened by the working face.
2. The method for evaluating the safe recovery of the face shortened fault waterproof coal pillar according to claim 1, wherein the method for acquiring the drilling unit water inflow q after grouting reinforcement in the grouting reinforcement area and in the recovery process is specifically as follows:
and Shi Dashui observation holes in the mining range of the fault waterproof coal pillar are shortened on the working face, and when the mining is carried out to the corresponding hydrological observation hole area, the drilling unit water inflow q in the mining process after grouting reinforcement of the grouting reinforcement area is obtained.
3. The safe recovery evaluation method for the face shortened fault waterproof coal pillar according to claim 1, wherein,
the number of the hydrologic observation holes is determined according to the width of the working face shortened fault waterproof coal pillar, and the number of the hydrologic observation holes is [6,8].
4. The method for evaluating the safe recovery of a face shortened fault waterproof coal pillar according to claim 1, wherein the grouting reinforcement area comprises: a first region, a second region, and a third region; the first area is a bottom plate geological weak area of the working face shortened fault waterproof coal pillar; the second area is an area of the working surface, in which the thickness of the junction of the bottom plate breaking area of the fault waterproof coal pillar and the top breaking area of the water-bearing layer is smaller than the thickness of the stratum with the maximum strength in the bottom plate stratum; the third area is a communication area between a bottom plate damage area of the working face shortened fault waterproof coal pillar and a top damage area of the aquifer.
5. The safe recovery evaluation method for the face shortened fault waterproof coal pillar according to claim 4, wherein,
determining the first region based on geological drilling or resistivity of the mining region of the face shortened fault waterproof coal pillar;
and carrying out a stope value test on the working face shortened fault waterproof coal pillar based on the established stope geological model of the working face shortened fault waterproof coal pillar, and dividing the second area and the third area.
6. A safe recovery evaluation system for a working face shortened fault waterproof coal pillar is characterized by comprising:
the parameter acquisition unit is configured to perform grouting reinforcement on a grouting reinforcement area of the working face shortened fault waterproof coal pillar, and acquire drilling unit water inflow q and the maximum destruction depth H of bottom plate mining after grouting reinforcement in the grouting reinforcement area and in the stoping process 1 Maximum height H of upward fracture expansion of aquifer top surface 2 And the maximum height H of the upper low resistivity of the top surface of the water-containing layer in the hydrological observation hole which is applied in the exploitation range of the working surface shortened fault waterproof coal pillar 3 ；
A coefficient correction unit configured to:
correcting a water bursting coefficient T of the working face shortened fault waterproof coal pillar in the stoping process after grouting reinforcement in the grouting reinforcement area;
wherein k is the water burst safety coefficient,
h is the distance from the bottom plate to the aquifer; p is the water pressure of the water-bearing layer of the bottom plate; q is the water inflow of a drilling unit before grouting reinforcement;
a stope guiding unit configured to calculate a water inrush coefficient according to the corrected water inrush coefficient and a preset safety value T Label (C) The safety recovery is carried out on the fault waterproof coal pillar with shortened working face;
the water inrush coefficient after correction and a preset safety value T Label (C) The safety recovery of the face shortened fault waterproof coal pillar comprises:
in response to k.epsilon.0, 1]And T is less than or equal to T Label (C) Mining the working face shortened fault waterproof coal pillar;
in response to k > 1 and T.ltoreq.T Label (C) The bottom plate is drained until k is E (0, 1]And T is less than or equal to T Label (C) Mining the fault waterproof coal pillar shortened by the working face;
in response to k > 1 and T > T Label (C) After the bottom plate is drained, grouting and reinforcing are carried out on the bottom plate until k is E (0, 1)]And T is less than or equal to T Label (C) And mining the fault waterproof coal pillar shortened by the working face.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108412547A (en) * | 2018-03-08 | 2018-08-17 | 安徽理工大学 | Prominent forecasting procedure and monitoring system are faced in a kind of more information synergisms monitorings of pressure-bearing fault activation gushing water |
| CN114814981A (en) * | 2022-05-20 | 2022-07-29 | 安徽恒源煤电股份有限公司 | Grouting reinforcement effect evaluation method and system for fault waterproof coal pillar exploitation |
| CN114837663A (en) * | 2022-05-20 | 2022-08-02 | 安徽建筑大学 | Construction method for improving recovery rate of fault waterproof coal pillar through ground pre-grouting |
| CN115012933A (en) * | 2022-05-20 | 2022-09-06 | 安徽恒源煤电股份有限公司 | Zonal grouting construction method for stoping fault waterproof coal pillar |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108412547A (en) * | 2018-03-08 | 2018-08-17 | 安徽理工大学 | Prominent forecasting procedure and monitoring system are faced in a kind of more information synergisms monitorings of pressure-bearing fault activation gushing water |
| CN114814981A (en) * | 2022-05-20 | 2022-07-29 | 安徽恒源煤电股份有限公司 | Grouting reinforcement effect evaluation method and system for fault waterproof coal pillar exploitation |
| CN114837663A (en) * | 2022-05-20 | 2022-08-02 | 安徽建筑大学 | Construction method for improving recovery rate of fault waterproof coal pillar through ground pre-grouting |
| CN115012933A (en) * | 2022-05-20 | 2022-09-06 | 安徽恒源煤电股份有限公司 | Zonal grouting construction method for stoping fault waterproof coal pillar |
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