CN106640190B - Mine goaf treatment method for surface construction photovoltaic power station - Google Patents
Mine goaf treatment method for surface construction photovoltaic power station Download PDFInfo
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- CN106640190B CN106640190B CN201611194709.5A CN201611194709A CN106640190B CN 106640190 B CN106640190 B CN 106640190B CN 201611194709 A CN201611194709 A CN 201611194709A CN 106640190 B CN106640190 B CN 106640190B
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000010276 construction Methods 0.000 title claims abstract description 32
- 239000003245 coal Substances 0.000 claims abstract description 73
- 238000005065 mining Methods 0.000 claims abstract description 36
- 238000005553 drilling Methods 0.000 claims abstract description 20
- 230000002093 peripheral effect Effects 0.000 claims abstract description 10
- 238000009933 burial Methods 0.000 claims abstract description 4
- 238000006073 displacement reaction Methods 0.000 claims abstract description 4
- 239000002002 slurry Substances 0.000 claims description 12
- 238000007689 inspection Methods 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 239000004568 cement Substances 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 description 5
- 238000007726 management method Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
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- 239000007787 solid Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
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- 238000012423 maintenance Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/005—Methods or devices for placing filling-up materials in underground workings characterised by the kind or composition of the backfilling material
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Abstract
The mine goaf treatment method for constructing the photovoltaic power station on the earth surface comprises the following steps: (a) determining the mine ground surface protection range according to the peripheral size of a planned photovoltaic power station construction; (b) determining subsidence data in a mine ground surface protection range, wherein the subsidence data comprises a maximum subsidence w, a maximum horizontal displacement epsilon and a maximum inclination i; (c) obtaining coal seam geological data and mining data in a protection range through drilling exploration, wherein the coal seam geological data and the mining data comprise the number n of coal seams, the thickness, the burial depth and the mining condition of each coal seam; (d) and determining whether the mined coal seam mined-out area is necessary to be treated or not according to the judgment criteria aiming at different types of the photovoltaic power stations to be built, determining that the mined coal seam mined-out area needs to be treated when one of the three judgment indexes is met, and determining that the maximum surface subsidence deformation value in the protection range is met when the three index values of the subsidence w, the horizontal deformation epsilon and the inclination i are met. The method is suitable for the mine goaf treatment of the photovoltaic power station constructed on the ground surface, and is low in cost, efficient and rapid.
Description
Technical Field
The invention relates to a mine goaf treatment method, in particular to a mine goaf treatment method for constructing a photovoltaic power station on the earth surface.
Background
A goaf can be formed below the underground of the coal mine after the coal seam is mined. Because of the existence of the goaf, the ground surface generates certain cracks, movement and deformation, and various structures, facilities and the like newly built in the influence range of the goaf generate certain influence, even damage, and can not be normally used, so that the goaf is often treated when the structures are built on the ground surface of the mine goaf. At present, important constructions such as expressways, high-rise residential buildings and the like are constructed on the ground surface above mine goafs, and the goafs are generally treated by performing all grouting filling treatment on all the goafs affected below a construction area, but the treatment method greatly increases the construction cost.
The photovoltaic power generation project mainly comprises a collection station, an inverter, a box transformer, a high-voltage transmission line tower, widely distributed photovoltaic modules, photovoltaic supports and other structures or facilities. For photovoltaic modules and photovoltaic supports which are widely distributed, because the photovoltaic modules and the photovoltaic supports are insensitive to ground surface settlement deformation of a coal mining subsidence area, a goaf below the photovoltaic modules and the photovoltaic supports does not need to be treated generally. The scattered single building structures such as the collection station, the inverter and box transformer, the high-voltage transmission line tower and the like are sensitive to ground surface subsidence deformation of the coal mining subsidence area, but are much lower in requirements compared with high-rise residential buildings and office buildings. At present, no goaf treatment method suitable for surface construction of a photovoltaic power station exists in the prior art.
Disclosure of Invention
The invention provides a mine goaf treatment method for a surface construction photovoltaic power station.
The technical scheme adopted by the invention is as follows:
the mine goaf treatment method for constructing the photovoltaic power station on the earth surface comprises the following steps:
(a) determining the mine ground surface protection range according to the peripheral size of a planned photovoltaic power station construction;
(b) determining subsidence data in the mine ground surface protection range, wherein the subsidence data comprises a maximum subsidence amount w, a maximum horizontal displacement amount epsilon and a maximum inclination amount i;
(c) obtaining coal seam geological data and mining data in a protection range through drilling exploration, wherein the coal seam geological data and the mining data comprise the number n of coal seams, the thickness, the burial depth and the mining condition of each coal seam;
(d) aiming at different types of the photovoltaic power stations to be built, determining whether the mined coal seam mined-out area needs to be treated or not according to the judgment criteria of the following table, determining that the mined coal seam mined-out area needs to be treated when one of the three judgment indexes is met, and determining that the maximum surface subsidence deformation value in the protection range is met when the three index values of subsidence w, horizontal deformation epsilon and inclination i are met;
(e) calculating to obtain a comprehensive treatment angle alpha according to the following formula, wherein beta is a comprehensive movement angle and is 70-75 degrees;
α=(90+ β)/2
(f) determining the control range of the mined coal seam goaf according to the mine ground surface protection range boundary and alpha;
(g) judging whether the goaf needs to be managed or not respectively aiming at different mining coal beds, and respectively determining a management range under the condition that the goaf needs to be managed;
(h) and performing grouting operation according to the control range of the goaf determined by each mined coal seam.
In the step (a) of the mine goaf treatment method for constructing the photovoltaic power station on the earth's surface, when the constructed photovoltaic power station is a gathering station, the peripheral dimension is determined according to the outer boundary of the surrounding construction enclosure, and when the constructed photovoltaic power station is of other types, the peripheral dimension is determined according to the basic outer boundary.
In the step (c) of the mine goaf treatment method for constructing the photovoltaic power station on the earth surface, when drilling exploration drill holes are arranged and the photovoltaic power station construction is proposed as a collecting station, 5 holes are arranged in the exploration drill holes, 1 hole is respectively arranged at the center of a protection range and 5-10 m inside 4 corner points, and when the photovoltaic power station construction is proposed as an inverter and box transformer or a high-voltage transmission line tower, 1 hole is arranged in the protection range center in the exploration drill holes.
In the method for treating the mine goaf of the photovoltaic power station built on the earth surface, the number n of the mined coal beds is determined to be 5 through drilling exploration.
In the step (h) of the method for treating the mine goaf of the photovoltaic power station built on the earth surface, the grouting operation comprises the following steps:
(a1) opening a hole and fixing the pipe by using an orifice pipe;
(b1) drilling to a bottom plate of a first layer of goaf, arranging a slurry injection pipe, preparing slurry, and then injecting slurry into the first layer of goaf;
(c1) and drilling to a bottom plate of the second layer of goaf, and grouting to the second layer of goaf.
In the method for treating the mine goaf of the photovoltaic power station constructed on the earth surface, the slurry is proportioned by using water: cement: 1: 0.3: 0.6-1.2, and when the drill drop height in the goaf is more than 0.3m, firstly injecting aggregate.
In the step (h) of the mine goaf treatment method for constructing the photovoltaic power station on the earth surface, the method further comprises a step (d 1), after the goaf grouting operation is completed for 2 months, the number of the inspection holes is 5% -10% of the number of the construction holes, the inspection holes are arranged in the middle of the two grouting holes, cores are taken from the grouting zone, the filling conditions of cavities, gaps and cracks in the goaf are found out, an indoor unidirectional compressive strength test is carried out on the test piece, and when the filling rate of the cavities is not less than 85% and the strength of the filled concretion body is not less than 0.5 MPa, the evaluation considers that the treatment meets the requirements.
Compared with the prior art, the technical scheme of the invention has the following advantages:
(1) according to the mine goaf treatment method for the surface construction of the photovoltaic power station, the basic outer boundary of the single building structure of the photovoltaic power station is used as the mine surface protection range, and the size of a maintenance belt considered according to the building protection grade is completely avoided in the protection range, so that the treatment cost can be effectively reduced, and the treatment efficiency can be improved.
(2) According to the mine goaf treatment method for constructing the photovoltaic power station on the ground surface, provided by the invention, the judgment criterion is determined aiming at different types of building structures of the photovoltaic power station, including single building structures or facilities such as a collecting station, an inverter, a box transformer, a high-voltage transmission line tower and the like, so that the method is more targeted in determining the necessity of treating the goaf, the treatment cost is controlled to a greater extent, and the treatment efficiency is improved.
(3) According to the mine goaf treatment method for the surface construction of the photovoltaic power station, the mining depth mining thickness ratio, the minimum mining depth, the maximum surface subsidence value, the maximum surface horizontal deformation value and the maximum inclined deformation value are used as judgment indexes for judging whether the goaf below the single building structure of the photovoltaic power station needs to be treated, and the comprehensiveness of influence factors and the weight influence are considered, so that the evaluation accuracy can be guaranteed, the difference of evaluation objects can be considered, and the evaluation reliability is effectively guaranteed.
(4) The mine goaf treatment method for the surface construction of the photovoltaic power station provided by the invention respectively confirms treatment necessity aiming at different goafs, avoids treating all layers of goafs under a building, and determines the goaf treatment range by depending on a comprehensive treatment angle, so that the method is more economical and faster on the premise of ensuring the purpose of protecting the building of the photovoltaic power station.
(5) According to the mine goaf treatment method for the surface construction of the photovoltaic power station, the situation of the goaf below the planned photovoltaic power station is obtained through drilling exploration, whether treatment is needed or not is determined according to the exploration result, the treatment range is determined, the number of holes with 5% -10% of grouting holes is arranged after the treatment is completed, effect detection is carried out, and the effect of goaf treatment is comprehensively evaluated, so that the method has higher accuracy, can better ensure the engineering quality, and can ensure that the goaf treatment achieves an ideal effect.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the embodiments of the present disclosure taken in conjunction with the accompanying drawings, in which
FIG. 1 is a schematic diagram of a proposed photovoltaic power station and a goaf structure in the mine goaf management method for constructing the photovoltaic power station on the earth surface.
Labeled as: 1-planning a photovoltaic power station, 2-mine ground surface, 3-first layer mining coal seam, 4-second layer mining coal seam, 5-third layer mining coal seam, 6-fourth layer mining coal seam and 7-fifth layer mining coal seam.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 shows a preferred embodiment of the mine goaf treatment method of the surface construction photovoltaic power station of the present invention.
The mine goaf treatment method for the photovoltaic power station constructed on the earth surface comprises the following steps:
(a) determining the protection range of the mine ground surface 2 according to the peripheral size of a planned photovoltaic power station construction 1;
(b) determining subsidence data within the mine ground surface 2 protection range, wherein the subsidence data comprises a maximum subsidence amount w, a maximum horizontal displacement amount epsilon and a maximum inclination amount i;
(c) obtaining coal seam geological data and mining data in a protection range through drilling exploration, wherein the coal seam geological data and the mining data comprise the number n of coal seams, the thickness, the burial depth and the mining condition of each coal seam;
(d) aiming at different types of the photovoltaic power stations to be built, determining whether the mined coal seam mined-out area needs to be treated or not according to the judgment criteria of the following table, determining that the mined coal seam mined-out area needs to be treated when one of the three judgment indexes is met, and determining that the maximum surface subsidence deformation value in the protection range is met when the three index values of subsidence w, horizontal deformation epsilon and inclination i are met;
(e) calculating to obtain a comprehensive treatment angle alpha according to the following formula, wherein beta is a comprehensive movement angle and is 70-75 degrees;
α=(90+ β)/2
(f) determining the control range of the mined coal seam goaf according to the protection range boundary and alpha of the mine ground surface (2);
(g) judging whether the goaf needs to be managed or not respectively aiming at different mining coal beds, and respectively determining a management range under the condition that the goaf needs to be managed;
(h) and performing grouting operation according to the control range of the goaf determined by each mined coal seam.
In the step (a), when the proposed photovoltaic power station building 1 is a gathering station, the peripheral dimension is determined according to the outer boundary of a surrounding construction enclosure, and when the proposed photovoltaic power station building 1 is of other types, the peripheral dimension is determined according to the basic outer boundary.
In this embodiment, the photovoltaic power plant structure 1 is a collection station, the surrounding construction fence has a size of 58.6m × 47m, and the built-in (structure) structure has: the transformer comprises a main transformer, a main transformer lead framework, an SVG transformer, a grounding transformer, an arc suppression coil, an outdoor support, an accident oil pool, a 35m lightning rod, a firewall, a cable trench, an enclosure wall, a 35kV primary equipment cabin, a secondary equipment cabin, an SVG cabin, a living facility box room, a duty box room and the like. And taking the outer boundary of the enclosing wall built around the gathering station as the mine ground surface protection range, wherein the determined ground surface protection range is 58.6m multiplied by 47 m.
In the step (c), when drilling exploration drill holes are arranged and the proposed photovoltaic power station building 1 is a gathering station, 5 holes are arranged in the exploration drill holes, 1 hole is respectively arranged at the center of a protection range and 5-10 m positions inside 4 corner points, and when the proposed photovoltaic power station building 1 is an inverter and box transformer or a high-voltage transmission line tower, 1 hole is arranged in the exploration drill holes at the center of the protection range.
In the embodiment, the proposed photovoltaic power station construction 1 is a gathering station, 5 holes are arranged in exploration drilling holes, and 1 hole is arranged in the center of a protection range and 5-10 m inside 4 corner points.
In this embodiment, the number n of the coal seams to be mined is 5 through drilling exploration.
The average mining depth of the first layer of mining coal seam 3 is 54.12m, the coal seam is close to a horizontal coal seam, the coal seam thickness is 1.00-3.00 m, the average coal seam thickness is 2.12m, the drilling drop amount is 0.40-1.44 m, and the average coal seam is 1.09 m; the average mining depth of the second layer of mined coal seam 4 is 83.58m, the coal seam is close to a horizontal coal seam, the coal seam thickness is 2.1-3.5 m, the average coal seam thickness is 2.55m, the drilling dropping amount is 1.00-2.00 m, and the average coal seam is 1.68 m; the average mining depth of the third layer of mining coal seam 5 is 134.11m, the coal seam is nearly horizontal, the average thickness of the coal seam is 2.24m, and solid coal is not provided with a goaf; the mining depth of the fourth layer of mining coal seam 6 is 230m, and the average thickness of the coal seam is 1.40 m; the average mining depth of the fifth-layer mined coal seam 7 is 283m, the average mining thickness is 4.0m, and the fifth-layer mined coal seam is solid coal.
In this example, the maximum subsidence within the protective range of the mine floor 2 is 947mm, the maximum horizontal deflection is 4.8mm/m, and the maximum inclination is 8.1 mm/m.
Because the depths of the goafs of the first layer of mined coal seam 3 and the second layer of mined coal seam 4 are both less than 120m, and the mining depth-mining thickness ratio is less than 50, the goaf of the first layer of mined coal seam 3 and the goaf of the second layer of mined coal seam 4 below the ground surface of the planned gathering station are determined to need to be managed. And the mined-out area of the fourth layer of coal seam 6 does not need to be treated.
In the present embodiment, the surface integrated travel angle β within the protection range is 74 °, and the integrated treatment angle α calculated therefrom is 82 °. The surface protection range of the proposed collection station is 58.6m multiplied by 47m, so that the control range of the mined-out area of the first layer of mined coal seam 3 is 8m outside the building, and the control range of the mined-out area of the second layer of mined coal seam 4 is 12m outside the building.
In step (h) of this embodiment, the grouting operation further includes the following steps:
(a1) opening a hole and fixing the pipe by using an orifice pipe;
(b1) drilling to a bottom plate of a first layer of goaf 3, arranging a slurry injection pipe, preparing slurry, and then injecting slurry into the first layer of goaf 3;
(c1) and drilling to the bottom plate of the second layer of gob 4, and grouting to the second layer of gob 4.
In this example, the slurry ratio was water: cement: 1: 0.3: 0.6-1.2, and when the drill drop height in the goaf is more than 0.3m, firstly injecting aggregate.
In the embodiment, the method further comprises a step (d 1), after the goaf grouting operation is completed for 2 months, the goaf treatment effect is detected and evaluated by arranging the inspection holes, the number of the inspection holes is 5% -10% of the number of the construction holes, the inspection holes are arranged in the middle of the two grouting holes, cores are taken from the grouting zone, the filling conditions of cavities, gaps and cracks in the goaf are found out, an indoor unidirectional compressive strength test is carried out on the test piece, and when the filling rate of the cavities is not lower than 85% and the strength of the filled concretion body is not lower than 0.5 MPa, the evaluation considers that the treatment meets the requirements.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are intended to be within the scope of the invention.
Claims (7)
1. The mine goaf treatment method for the surface construction of the photovoltaic power station is characterized by comprising the following steps: the method comprises the following steps:
(a) determining the protection range of the mine ground surface (2) according to the peripheral size of a planned photovoltaic power station building (1);
(b) determining subsidence data within the protection range of the mine earth surface (2), wherein the subsidence data comprises a maximum subsidence amount w, a maximum horizontal displacement amount epsilon and a maximum inclination amount i;
(c) obtaining coal seam geological data and mining data in a protection range through drilling exploration, wherein the coal seam geological data and the mining data comprise the number n of coal seams, the thickness, the burial depth and the mining condition of each coal seam;
(d) aiming at different types of the photovoltaic power stations to be built, determining whether the mined coal seam mined-out area needs to be treated or not according to the judgment criteria of the following table, determining that the mined coal seam mined-out area needs to be treated when one of the three judgment indexes is met, and determining that the maximum surface subsidence deformation value in the protection range is met when the three index values of subsidence w, horizontal deformation epsilon and inclination i are met;
(e) calculating to obtain a comprehensive treatment angle alpha according to the following formula, wherein beta is a comprehensive movement angle and is 70-75 degrees;
(f) determining the control range of the mined coal seam goaf according to the protection range boundary and alpha of the mine ground surface (2);
(g) judging whether the goaf needs to be managed or not respectively aiming at different mining coal beds, and respectively determining a management range under the condition that the goaf needs to be managed;
(h) and performing grouting operation according to the control range of the goaf determined by each mined coal seam.
2. The mine goaf treatment method for the surface construction of the photovoltaic power station as claimed in claim 1, wherein: in the step (a), when the proposed photovoltaic power station building (1) is a gathering station, the peripheral dimension is determined according to the outer boundary of a surrounding construction enclosure, and when the proposed photovoltaic power station building (1) is of other types, the peripheral dimension is determined according to the basic outer boundary.
3. The mine goaf treatment method for the surface construction of the photovoltaic power station as claimed in claim 1, wherein: in the step (c), when drilling exploration drill holes are arranged and the proposed photovoltaic power station building (1) is a gathering station, 5 holes are arranged in the exploration drill holes, 1 hole is respectively arranged at the center of a protection range and 5-10 m positions inside 4 angular points, and when the proposed photovoltaic power station building (1) is an inverter and box transformer or a high-voltage transmission line tower, 1 hole is arranged in the center of the protection range.
4. The mine goaf treatment method for the surface construction of photovoltaic power plants according to any one of claims 1 to 3, characterized in that: and (5) confirming the number n of the mined coal beds through drilling exploration.
5. The mine goaf treatment method for the surface construction of the photovoltaic power station as claimed in claim 4, wherein: in step (h), the grouting operation further comprises the following steps:
opening a hole and fixing the pipe by using an orifice pipe;
drilling to a bottom plate of a first layer of goaf (3), arranging a slurry injection pipe, preparing slurry, and then injecting slurry into the first layer of goaf (3);
and drilling to a bottom plate of the second layer of gob (4) and grouting to the second layer of gob (4).
6. The mine goaf treatment method for the surface construction of the photovoltaic power station as claimed in claim 5, wherein: the slurry proportion adopts water: cement: 1: 0.3: 0.6-1.2, and when the drill drop height in the goaf is more than 0.3m, firstly injecting aggregate.
7. The mine goaf treatment method for the surface construction of the photovoltaic power station as claimed in claim 5, wherein: and (d 1) after the goaf grouting operation is finished for 2 months, arranging inspection holes to detect and evaluate the goaf treatment effect, wherein the number of the inspection holes is 5% -10% of the number of the construction holes, the inspection holes are arranged in the middle of the two grouting holes, coring the grouting zone, finding out the goaf cavity, gap and crack filling conditions, carrying out an indoor unidirectional compressive strength test on the test piece, and evaluating that the treatment requirement is met when the cavity filling rate is not less than 85% and the filling concretion strength is not less than 0.5 MPa.
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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 |
| CN112923129B (en) * | 2021-01-21 | 2022-10-14 | 四川石油天然气建设工程有限责任公司 | Butt-joint type dragging pipe construction process and system for oil and gas pipelines |
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| CN106251053A (en) * | 2016-07-27 | 2016-12-21 | 煤炭科学技术研究院有限公司 | The suitability assessment method of high voltage power transmission transmission tower is built on earth's surface, a kind of sinking land in coalmining areas |
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