CN109899109B - Grouting filling method for irregular goaf - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 47
- 230000001788 irregular Effects 0.000 title claims abstract description 28
- 239000003245 coal Substances 0.000 claims abstract description 95
- 238000005065 mining Methods 0.000 claims description 45
- 238000007569 slipcasting Methods 0.000 claims description 8
- 238000012937 correction Methods 0.000 claims description 7
- 238000009792 diffusion process Methods 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims 1
- 239000011440 grout Substances 0.000 claims 1
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- 238000012986 modification Methods 0.000 description 2
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- 230000003712 anti-aging effect Effects 0.000 description 1
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- 239000011707 mineral Substances 0.000 description 1
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Abstract
The invention discloses a grouting filling method of an irregular goaf, which comprises the following steps: step 1: defining a treatment range of the goaf according to boundary angles by taking a building group to be built as a protected object; step 2: arranging a plurality of grouting filling belts at intervals in the treatment range, wherein the grouting filling belts are annular or arc-shaped; and step 3: grouting is carried out at the position of the grouting filling zone through grouting equipment, and a filling body formed by grouting and a coal pillar in the goaf form structural support together. The grouting filling method of the irregular goaf effectively solves the problems that the grouting filling method of the irregular goaf in the prior art is high in treatment cost, cannot eliminate the hidden danger of coal pillar unstable ground surface sudden subsidence and is difficult to ensure the subsidence reducing effect.
Description
Technical Field
The invention relates to the technical field of mining, in particular to a grouting filling method for irregular goafs.
Background
In the prior art, the coal mine large-scale mining in China has a history of hundreds of years. With the continuous development of coal mining technology, the coal mining method in China is influenced by the geological conditions of coal seams, and goes through a plurality of development stages such as a room and pillar method, a strip method, a short wall method, a long wall method and the like, and the adopted roof management method comprises a caving method, a filling method and the like. Different coal mining methods are adopted for mines with different scales and different conditions, and a long-wall coal mining method is usually adopted for large-scale mines with good geological conditions in coal seams; the mine with unstable geological conditions usually adopts a short-wall type and room-pillar type coal mining method to form irregular goafs and irregular residual coal pillars.
The irregular goaf refers to that the shapes of all mining working faces or mining blocks are irregular, the sizes of the mining working faces or the mining blocks are inconsistent, and the mining working faces or the mining blocks are distributed scattered; the shape, size and distribution of the coexisting residual coal pillars are irregular, and the irregular residual coal pillars are easy to collapse and have linkage instability, so that serious potential safety hazards exist, the treatment difficulty is high, most of irregular goafs are not fully exploited, and the goafs and the treatment cost are high.
The related data show that the interior of the irregularly mined goaf mostly has an incomplete filling state and a half filling state. The filling materials are caving rock blocks, coal blocks and other loose materials, wherein the filling materials are provided with holes with different sizes, particularly goafs of small kilns, small coal mines and ancient kilns, the coal mining mode is mostly roadway mining or knife column type coal mining, the mining depth mining thickness ratio is generally about 20-30, most goafs are provided with holes with the height of 40% -60% of the thickness of a mineral layer, and the holes are subjected to various internal and external factors (such as ground stress, underground water, ground building (structure) load and the like) after a certain time (some in decades or even hundreds of years), so that coal column instability is possible to occur, the top plate and the ground surface are suddenly deformed or caving, and the specific time, specific position and deformation size of the top plate and the ground surface are difficult to predict.
If sandstone with high strength and thickness is arranged in overlying rock stratum of great same mining area, the roof sinks slowly after mining, but when the area of the goaf reaches tens of thousands and hundreds of thousands of square meters, large-area caving and sinking occur, and the damage to the earth surface is great. The ground subsidence problem of the abandoned goaf appears in 30 states in the United states, and the subsidence problem of five states such as Pennsylvania with the largest underground mining amount is the most prominent. Research on the subsidence of pittsburgh coal seams indicates that subsidence of a scrapped coal mine may occur many years after mining, more than half of subsidence occurs 50 years or more after mining, and the time of surface subsidence is undoubtedly influenced by the rock strata and coal pillar destruction rate and other factors.
The coal pillars reserved in the small kiln are involved in long-term stability, the potential safety hazard exists on the ground surface, the coal pillars can be suddenly damaged, the ground surface is suddenly collapsed and sunk, the safety of ground surface buildings is endangered, and the personal safety can be realized in serious cases. Therefore, when a large-scale building group is built above a large-scale irregular goaf, certain measures must be taken to eliminate the hidden dangers of coal pillar sudden collapse and ground surface sudden subsidence.
The prior art adopts a grouting filling method which comprises the following methods:
(1) the whole grouting method comprises the following steps: the method is characterized in that the whole filling goaf supports overlying strata so as to thoroughly eliminate the hidden danger of foundation subsidence, a dry filling method for conveying waste rocks by vehicles in a tunnel, a wet filling method for grouting filling and the like are adopted, and grouting materials mainly comprise fly ash, cement mortar and the like. In the prior art, the method for filling the goaf by adopting all grouting is adopted, the grouting filling amount is large, and the goaf treatment cost is high. Therefore, the method is not suitable for the treatment of large-scale goafs below large-scale building areas.
(2) Point grouting method: point type local grouting is carried out to form a column, the goaf overlying strata such as grouting columns, underground pier building columns, large-diameter drilled pile columns and the like are supported, the space span of the goaf is reduced, and the roof is prevented from collapsing; or directly adopts the pile foundation method to partially support the ground building (structure). For irregular goafs, the main goal of treatment is to eliminate the potential safety hazard caused by possible linkage instability of residual coal pillars in the goaf range. However, all grouting filling methods have a large grouting range, are difficult to accurately reinforce the coal pillar, and cannot achieve the aim of eliminating hidden dangers. And the adoption of local filling goaf usually only can carry out punctiform filling, is mainly suitable for the treatment of regular goaf, and is suitable for the treatment of the goaf under a small-scale building area (structure), such as residential districts, plants, high-voltage line towers and the like. For the treatment of deep and large-scale goaf, structural support is difficult to form by adopting point grouting, the point grouting strength is insufficient, and the hidden trouble of coal pillar unstable surface sudden subsidence cannot be eliminated.
(3) The overlying strata separation layer grouting filling technology comprises the following steps: the method is characterized in that holes are drilled from the ground, rock-soil body separation and crack grouting is carried out on a mining overburden rock fracture zone and a bending zone, so that a rock plate structure with high rigidity and good integrity is formed, upward development of collapse of an anti-aging goaf is effectively resisted, and only relatively balanced subsidence is generated on the ground surface, so that the safety of ground surface structures is ensured. The method has the advantages that the effect depends on the size of the separation space and the grouting effectiveness, so that the method is mainly suitable for large rock stratum lithology difference, the rock stratum cannot move synchronously due to mining influence, the separation space is large, the retention time is long, and timely grouting filling can be realized. Such conditions are demanding and difficult to achieve in many mines. Compared with the separation grouting filling in the mining process, the space for performing the separation grouting in the overlying rock of the goaf is smaller, and the filling and sinking reduction effects are difficult to ensure. For irregular goafs, the space to be treated mainly exists inside the goaf, but not in the overburden abscission layer, so the overburden abscission layer grouting technology is not suitable for the irregular goafs.
In conclusion, the grouting filling method for irregular goafs in the prior art has the disadvantages of high treatment cost, incapability of eliminating the hidden danger of coal pillar unstable surface sudden subsidence and difficulty in ensuring the subsidence reduction effect.
Disclosure of Invention
The embodiment of the invention provides a grouting filling method for an irregular goaf, and aims to solve the problems that in the prior art, the grouting filling method for the irregular goaf has high treatment cost, cannot eliminate the hidden danger of coal pillar unstable ground surface sudden subsidence, and is difficult to ensure the subsidence reduction effect.
In order to achieve the aim, the invention provides a grouting filling method of an irregular goaf, which comprises the following steps: step 1: defining a treatment range of the goaf according to boundary angles by taking a building group to be built as a protected object; step 2: arranging a plurality of grouting filling belts at intervals in the treatment range, wherein the grouting filling belts are annular or arc-shaped; and step 3: grouting is carried out at the position of the grouting filling zone through grouting equipment, and a filling body formed by grouting and a coal pillar in the goaf form structural support together.
Further, in the step 1, the treatment range of the goaf is obtained according to the following formula:
wherein: dzThe horizontal distance from the outer boundary of the building group to the goaf treatment boundary along the coal seam trend; dq1The horizontal distance from the outer boundary of a building group which tends to descend along the coal seam to the goaf governing boundary; dq2The horizontal distance from the outer boundary of the mountain building group to the goaf treatment boundary is inclined along the coal seam; h isjIs the thickness of the bedrock; delta0To run along the coal seam at boundary angles, β0To incline the boundary angle gamma of the downhill along the coal seam0Is a rimThe coal seam tends to rise to the boundary angle; h issIs the thickness of the loose layer;
is the loose layer shift angle.
Further, the step 2 further comprises the following steps: determining the width a of the grouting filling zone according to geological mining conditions of a treatment area, wherein the formula is as follows: a is 0.028kaMH, wherein kaFor correction factor, M is coal thickness and H is mining depth.
Further, the step 2 further comprises the following steps:
and determining the interval b between the grouting filling zones according to geological mining conditions of the treatment area, wherein the formula is as follows:
Further, k isaThe values of (a) are determined from the coal thickness M: when M is less than or equal to 1.3, then kaThe value of (A) is 4; when M is more than 1.3 and less than or equal to 3.5, k isaThe value of (A) is 3; when M is more than 3.5 and less than or equal to 8.0, k isaThe value of (A) is 2; when M > 8.0, then kaThe value of (A) is 1; wherein the number of M is in meters.
Further, the step 3 comprises the following steps: arranging a curtain grouting hole and an inner grouting hole in a filling area of the grouting filling belt; and grouting equipment is used for grouting the grouting filling belt of the goaf through the curtain grouting hole and the internal grouting hole.
Further, grouting is alternately performed through the curtain grouting holes and the inner grouting holes, grouting is started through the curtain grouting holes in the grouting process, and grouting is performed through the inner grouting holes after slurry is solidified.
Furthermore, the curtain grouting holes are arranged on two sides of the filling area, the aperture of each curtain grouting hole is 110mm, the grouting diffusion radius is 5-10m, the hole distance along the belt direction is 10-20m, and the distance from each curtain grouting hole to the boundary of the filling area is 5-10 m.
Furthermore, the inner grouting holes are arranged in the middle of the filling area, the aperture of each inner grouting hole is 110mm, the grouting diffusion radius is 15-20m, the hole distance between every two adjacent inner grouting holes is 30-40m, and the distance between the inner grouting holes and a grouting belt of the curtain grouting hole is 20-25 m.
Furthermore, the annular circle center or the arc circle center of the grouting filling belt is the reference point of the building group to be built.
Aiming at building a large-scale building group above a large-scale irregular goaf for multi-coal-seam mining, an island chain type column filling belt structure is formed by a plurality of annular or arc-shaped grouting filling belts which are arranged at intervals and are combined with the rest coal columns, a filling body formed by grouting and the coal columns in the goaf form a structural support together, and the plurality of grouting filling belts can be connected with the coal columns to enlarge the effective bearing area of the coal columns; moreover, the grouting filling belt can also laterally reinforce the coal pillar, so that the integrity and the strength of the coal pillar are improved; and the near-empty environment of the coal pillar is isolated through the grouting filling belt, so that the wind oxidability of the coal pillar is effectively weakened, and the long-term stability of the coal pillar is ensured. Compared with the prior art, the structure can not carry out full grouting, so that the effect of lower cost is realized, and the formed grouting filling belt can effectively eliminate the hidden troubles of sudden instability of the coal pillar and sudden subsidence of the earth surface by matching with the coal pillar, so that the residual movement deformation of the earth surface is slowed down.
Drawings
FIG. 1 is a schematic plan view of a grouting filling of an irregular gob according to an embodiment of the present invention;
FIG. 2 is a schematic illustration of the irregular goaf along the coal seam inclination treatment range in accordance with an embodiment of the present invention;
FIG. 3 is a schematic diagram of the irregular goaf treatment range along the coal seam strike direction according to the embodiment of the invention; FIG. 4 is a schematic view of the cross-section A-A' of FIG. 1;
FIG. 5 is a schematic view of the cross-section B-B' of FIG. 1;
FIG. 6 is a schematic view of the cross-section at C-C' of FIG. 1;
FIG. 7 is a schematic view of the grouting hole distribution and grouting sequence according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the examples, but without limiting the invention.
Referring to fig. 1 to 6, according to an embodiment of the present invention, there is provided a method for grouting and filling a gob, including the steps of:
step 1: and (4) defining the treatment range of the goaf according to the boundary angle by taking the building group to be built as a protected object.
Step 2: arranging a plurality of grouting filling belts at intervals in the treatment range, wherein the grouting filling belts are annular or arc-shaped; and the annular circle center or the arc circle center of the grouting filling belt is taken as a reference point of the building group to be built.
And step 3: grouting is carried out at the position of the grouting filling zone through grouting equipment, and a filling body formed by grouting and a coal pillar in the goaf form structural support together.
Aiming at building a large-scale building group above a large-scale irregular goaf for multi-coal-seam mining, an island chain type column filling belt structure is formed by a plurality of annular or arc-shaped grouting filling belts which are arranged at intervals and are combined with the rest coal columns, a filling body formed by grouting and the coal columns in the goaf form a structural support together, and the plurality of grouting filling belts can be connected with the coal columns to enlarge the effective bearing area of the coal columns; moreover, the grouting filling belt can also laterally reinforce the coal pillar, so that the integrity and the strength of the coal pillar are improved; and the near-empty environment of the coal pillar is isolated through the grouting filling belt, so that the wind oxidability of the coal pillar is effectively weakened, and the long-term stability of the coal pillar is ensured. Compared with the prior art, the structure can not carry out full grouting, so that the effect of lower cost is realized, and the formed grouting filling belt can effectively eliminate the hidden troubles of sudden instability of the coal pillar and sudden subsidence of the earth surface by matching with the coal pillar, so that the residual movement deformation of the earth surface is slowed down.
Further preferably, in the step 1, the treatment range of the goaf is obtained according to the following formula:
wherein: dzThe horizontal distance from the outer boundary of the building group to the goaf treatment boundary along the coal seam trend; dq1The horizontal distance from the outer boundary of a building group which tends to descend along the coal seam to the goaf governing boundary; dq2The horizontal distance from the outer boundary of the mountain building group to the goaf treatment boundary is inclined along the coal seam; h isjIs the thickness of the bedrock; delta0To run along the coal seam at boundary angles, β0To incline the boundary angle gamma of the downhill along the coal seam0Is the boundary angle of the coal seam inclined upward; h issIs the thickness of the loose layer;
is the loose layer shift angle.
The reasonable-design width and the distance of the island-chain-type column filling belt structure can reduce the filling amount and reduce the treatment cost of the filling goaf on the premise of ensuring the strength of the column filling belt, and eliminate the hidden troubles of the coal column sudden instability and the surface sudden subsidence, which is the key of irregular goaf island-chain-type grouting reinforcement. According to the theory of strip mining, the width of the island chain type coal pillar filling belt is the reserved width a in strip mining, and the distance between the island chain type coal pillar filling belts is the mining width b.
Further preferably, the step 2 further comprises the following steps:
determining the width a of the grouting filling zone according to geological mining conditions of a treatment area, wherein the formula is as follows:
a＝0.028kaMH, wherein kaFor correction factor, M is coal thickness and H is mining depth.
The step 2 further comprises the following steps:
and determining the interval b between the grouting filling zones according to geological mining conditions of the treatment area, wherein the formula is as follows:
Wherein k isaThe values of (a) are determined from the coal thickness M:
when M is less than or equal to 1.3, then kaThe value of (A) is 4;
when M is more than 1.3 and less than or equal to 3.5, k isaThe value of (A) is 3;
when M is more than 3.5 and less than or equal to 8.0, k isaThe value of (A) is 2;
when M > 8.0, then kaThe value of (A) is 1;
wherein the number of M is in meters.
The requirement a should not be too small to allow sufficient strength and stability of the resulting island chain coal pillar pack. The correction factor ka is introduced by referring to Wilson coal column stability theory and considering the hysteresis support characteristic of the filling body different from the raw coal column. And (3) a, namely 0.028kaMH, wherein ka is a correction coefficient, the value of ka can be referred to the table 1, M is the coal thickness of a coal mining layer, and H is the mining depth. When the goaf meets a fault, the column charging width can be calculated according to 0.1H (upper tray) and 0.2H (lower tray).
TABLE 1 Width correction factor Table
| Classification of coal seam | Coal thickness (m) | Correction factor ka |
| Thin coal seam | M≤1.3 | 4 |
| Medium thick coal seam | 1.3＜M≤3.5 | 3 |
| Thick coal seam | 3.5＜M≤8.0 | 2 |
| Ultra-thick coal seam | M＞8.0 | 1 |
Referring to fig. 1 to 6, a1 and a2 are shown as the width of each slip-filled strip, and b1 and b2 are shown as the distance between two slip-filled strips.
Further preferably, the step 3 comprises the steps of:
arranging a curtain grouting hole and an inner grouting hole in a filling area of the grouting filling belt;
and grouting equipment is used for grouting the grouting filling belt of the goaf through the curtain grouting hole and the internal grouting hole.
And arranging curtain grouting holes in a filling area to be grouted, drilling and grouting at the periphery and the center, and filling the goaf. And (3) constructing a belt-shaped supporting structure of the coal pillar and the filling body, so that the risk of sudden interlocking instability of the goaf is reduced, and the residual movement deformation of the goaf is slowed down.
Further, referring to fig. 7, grouting is performed alternately through the curtain grouting holes and the inner grouting holes, during the grouting process, grouting is started through the curtain grouting holes, and after the slurry is basically solidified for a period of time, grouting is performed through the inner grouting holes. The numbers in fig. 7 are numbered in the order of alternating slip casting, and are of course not limited to a single order, fig. 7 only showing one of these cases.
Further preferably, the curtain grouting holes are arranged on two sides of the filling area, the aperture of each curtain grouting hole is 110mm, the grouting diffusion radius is 5-10m, the hole distance along the belt direction is 10-20m, and the distance from each curtain grouting hole to the boundary of the filling area is 5-10 m. The pulping material injected from the curtain grouting hole mainly comprises cement, clay, fly ash and an accelerating agent. Ensures high slurry concentration, poor fluidity and high solidification speed.
The inner grouting holes are arranged in the middle of the filling area, the aperture of each inner grouting hole is 110mm, the grouting diffusion radius is 15-20m, the hole distance between every two adjacent inner grouting holes is 30-40m, and the distance between the inner grouting holes and a grouting belt of the curtain grouting hole is 20-25 m. The pulping materials injected from the inner grouting hole mainly comprise cement, sand and fly ash, and the concentration is low. Ensure the low concentration and good fluidity of the slurry.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.
Of course, the above is a preferred embodiment of the present invention. It should be noted that, for a person skilled in the art, several modifications and refinements can be made without departing from the basic principle of the invention, and these modifications and refinements are also considered to be within the protective scope of the invention.
Claims (9)
1. A grouting filling method of an irregular goaf is characterized by comprising the following steps:
step 1: defining a treatment range of the goaf according to boundary angles by taking a building group to be built as a protected object;
step 2: arranging a plurality of grouting filling belts at intervals in the treatment range, wherein the grouting filling belts are annular or arc-shaped;
and step 3: grouting is carried out at the position of the grouting filling zone through grouting equipment, and a filling body formed by grouting and a coal pillar in the goaf form structural support together;
in the step 1, the treatment range of the goaf is obtained according to the following formula:
wherein: dzThe horizontal distance from the outer boundary of the building group to the goaf treatment boundary along the coal seam trend; dq1The horizontal distance from the outer boundary of a building group which tends to descend along the coal seam to the goaf governing boundary; dq2The horizontal distance from the outer boundary of the mountain building group to the goaf treatment boundary is inclined along the coal seam; h isjIs the thickness of the bedrock; delta0To run along the coal seam at boundary angles, β0To incline the boundary angle gamma of the downhill along the coal seam0Is the boundary angle of the coal seam inclined upward; h issIs the thickness of the loose layer;
is the loose layer shift angle.
2. The grouting filling method according to claim 1, wherein the step 2 further comprises the steps of:
determining the width a of the grouting filling zone according to geological mining conditions of a treatment area, wherein the formula is as follows:
a＝0.028kaMH, wherein kaFor correction factor, M is coal thickness and H is mining depth.
3. The grouting filling method according to claim 1 or 2, characterized in that the step 2 further comprises the steps of:
and determining the interval b between the grouting filling zones according to geological mining conditions of the treatment area, wherein the formula is as follows:
4. The method of claim 2, wherein k is kaThe values of (a) are determined from the coal thickness M:
when M is less than or equal to 1.3, then kaThe value of (A) is 4;
when M is more than 1.3 and less than or equal to 3.5, k isaThe value of (A) is 3;
when M is more than 3.5 and less than or equal to 8.0, k isaThe value of (A) is 2;
when M > 8.0, then kaThe value of (A) is 1;
wherein the number of M is in meters.
5. The grouting filling method according to claim 1, wherein the step 3 includes the steps of:
arranging a curtain grouting hole and an inner grouting hole in a filling area of the grouting filling belt;
and grouting equipment is used for grouting the grouting filling belt of the goaf through the curtain grouting hole and the internal grouting hole.
6. The grouting filling method according to claim 5, characterized in that grouting is performed alternately through the curtain grouting hole and the inner grouting hole, grouting is started through the curtain grouting hole during grouting, and grouting is performed through the inner grouting hole after the grout is solidified.
7. The grouting filling method according to claim 5, wherein the curtain grouting holes are arranged on two sides of the filling area, the curtain grouting holes have the aperture of 110mm, the grouting diffusion radius of 5-10m, the hole spacing along the belt direction of 10-20m, and the distance from the boundary of the filling area is 5-10 m.
8. The slip casting method according to claim 5, wherein the inner slip casting holes are arranged at a middle position of the casting area, the inner slip casting holes have a hole diameter of 110mm and a slip casting spreading radius of 15-20m, a hole interval between two adjacent inner slip casting holes is 30-40m, and a distance from a slip casting band of the curtain slip casting hole is 20-25 m.
9. The grouting filling method according to claim 1, wherein the circle center of the annular or arc-shaped circle center of the grouting filling belt is a reference point of a building group to be built.
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| CN110307034B (en) * | 2019-04-04 | 2020-05-22 | 中国矿业大学(北京) | Strip type grouting filling method for goaf |
| CN112695739B (en) * | 2020-12-18 | 2021-09-21 | 中国矿业大学(北京) | Grouting reinforcement method for thick flowing sand layer under mining influence area building structure group |
| CN112593543B (en) * | 2020-12-18 | 2021-10-08 | 中国矿业大学(北京) | Well lattice type reinforcing method for building foundation in shallow-buried thick quicksand layer subsidence area |
| CN113266418B (en) * | 2021-05-24 | 2022-04-15 | 中国矿业大学 | Method for filling fan-shaped radial cemented paste in gob-side entry retaining side goaf |
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| US4463807A (en) * | 1981-06-15 | 1984-08-07 | In Situ Technology, Inc. | Minimizing subsidence effects during production of coal in situ |
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| CN104775816A (en) * | 2015-02-27 | 2015-07-15 | 中国矿业大学 | Isolated grouting-filling mining method for overburden rock without village migration under cut-side local pressed-coal conditions |
| CN106150546A (en) * | 2016-08-05 | 2016-11-23 | 太原理工大学 | A kind of method carrying out goaf part filling according to earth's surface subsidence |
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2019
- 2019-04-04 CN CN201910270743.3A patent/CN109899109B/en active Active
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2020
- 2020-04-02 PL PL433434A patent/PL433434A1/en unknown
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| US4463807A (en) * | 1981-06-15 | 1984-08-07 | In Situ Technology, Inc. | Minimizing subsidence effects during production of coal in situ |
| CN102330423A (en) * | 2011-07-20 | 2012-01-25 | 山西潞安矿业(集团)有限责任公司 | Method for evaluating stability of newly built railway foundation on goaf |
| CN103572680A (en) * | 2012-08-02 | 2014-02-12 | 五冶集团上海有限公司 | Road roadbed filling construction method of coal mine gob |
| CN104775816A (en) * | 2015-02-27 | 2015-07-15 | 中国矿业大学 | Isolated grouting-filling mining method for overburden rock without village migration under cut-side local pressed-coal conditions |
| CN106150546A (en) * | 2016-08-05 | 2016-11-23 | 太原理工大学 | A kind of method carrying out goaf part filling according to earth's surface subsidence |
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| CN109899109A (en) | 2019-06-18 |
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