CN112576192A - Grouting reinforcement method based on loose rock coal seam - Google Patents
Grouting reinforcement method based on loose rock coal seam Download PDFInfo
- Publication number
- CN112576192A CN112576192A CN202011280450.2A CN202011280450A CN112576192A CN 112576192 A CN112576192 A CN 112576192A CN 202011280450 A CN202011280450 A CN 202011280450A CN 112576192 A CN112576192 A CN 112576192A
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- construction section
- grouting
- layer construction
- holes
- hole
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- 239000003245 coal Substances 0.000 title claims abstract description 33
- 239000011435 rock Substances 0.000 title claims abstract description 28
- 230000002787 reinforcement Effects 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000010276 construction Methods 0.000 claims abstract description 94
- 239000002002 slurry Substances 0.000 claims abstract description 34
- 238000002347 injection Methods 0.000 claims abstract description 10
- 239000007924 injection Substances 0.000 claims abstract description 10
- 238000005553 drilling Methods 0.000 claims description 17
- 238000007789 sealing Methods 0.000 claims description 7
- 238000007711 solidification Methods 0.000 claims description 6
- 230000008023 solidification Effects 0.000 claims description 6
- 238000009792 diffusion process Methods 0.000 claims description 4
- 238000004080 punching Methods 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims 1
- 239000010935 stainless steel Substances 0.000 claims 1
- 230000003014 reinforcing effect Effects 0.000 abstract description 3
- 230000011218 segmentation Effects 0.000 abstract description 3
- 238000005065 mining Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
Abstract
The invention relates to the technical field of loose rock coal seam grouting reinforcement, and discloses a grouting reinforcement method based on a loose rock coal seam, which comprises the following steps: a: the upper portion of the loose rock coal seam is divided into an upper layer construction section, a middle layer construction section and a lower layer construction section from top to bottom in sequence, holes are drilled upwards in the upper layer construction section, the middle layer construction section and the lower layer construction section along the inclination of a horizontal plane respectively, residues in the drilled holes are removed, a sleeve is installed in each hole, 2-6 grouting holes are installed in the upper layer construction section, 5-15 grouting holes are installed in the middle layer construction section, and 3-7 grouting holes are installed in the lower layer construction section. The invention carries out layer segmentation on the loose rock coal bed, and the slurry concentration and the slurry injection amount of the upper layer construction section and the lower layer construction section are less than those of the middle layer construction section, so that the middle layer construction section has higher reinforcing and bearing functions, and the loosening and crushing among different coal beds can be effectively prevented.
Description
Technical Field
The invention relates to the technical field of loose rock coal seam grouting reinforcement, in particular to a grouting reinforcement method based on a loose rock coal seam.
Background
The coal seam, the top and the bottom of the loose rock coal seam are soft and broken, so that the mining difficulty is high, and currently, for the mining of the loose rock coal seam, in order to prevent the top breaking from appearing in the mining process, grouting reinforcement needs to be carried out on a pre-mining section, so that the follow-up construction is facilitated.
However, the existing grouting reinforcement method is too single, and after grouting, loosening and crushing of different coal seams are easy to occur, the grouting effect is difficult to detect, and whether the grouting quality reaches the standard cannot be known. Therefore, the person skilled in the art provides a grouting reinforcement method based on unconsolidated rock coal seams to solve the problems in the background art.
Disclosure of Invention
The invention aims to provide a grouting reinforcement method based on a loose rock coal seam, and aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a grouting reinforcement method based on a loose rock coal seam comprises the following steps:
a: the upper part of a loose rock coal seam is sequentially divided into an upper layer construction section, a middle layer construction section and a lower layer construction section from top to bottom, holes are respectively drilled in the upper layer construction section, the middle layer construction section and the lower layer construction section along the inclination with a horizontal plane, residues in the drilled holes are removed, a sleeve is arranged in each hole, 2-6 grouting holes are arranged in the upper layer construction section, 5-15 grouting holes are arranged in the middle layer construction section, and 3-7 grouting holes are arranged in the lower layer construction section;
b: installing a flow meter at the port of the casing, injecting the slurry into the drill hole through the casing, and determining the grouting range according to the diffusion radius of the slurry;
c: and (3) detecting the solidification condition of the slurry in the drilled holes, distributing the holes, continuing drilling and grouting when the number of the distributed holes is more than 15% of the number of the drilled holes, and then drawing a fan-shaped and broken line statistical graph according to the drilled holes and actual change values before and after grouting.
As a still further scheme of the invention: and in the step B, when the drilling and grouting are continuously operated, grouting is carried out immediately after one drilling hole is constructed, then another drilling hole is constructed, hole sealing of the hole opening is carried out correspondingly, and an exhaust pipe is inserted into the hole opening.
As a still further scheme of the invention: in the step A, the slurry concentration of the middle layer construction section is greater than the slurry concentrations of the upper layer construction section and the lower layer construction section, and the slurry injection amount of the middle layer construction section is also greater than the slurry injection amounts of the upper layer construction section and the lower layer construction section.
As a still further scheme of the invention: after grouting, the single drill hole is used for pulling out the sleeve in the inclined drill hole and sealing the hole, and meanwhile, the included angle between the inclined drill hole and the horizontal plane is 9-13 degrees.
As a still further scheme of the invention: when the number of the holes is more than 15% of the number of the drilled holes, whether the hole grouting speed is more than 5m or not is also checked3If it is greater than 5m3And h, continuously punching and grouting.
As a still further scheme of the invention: the hole diameter of the drilling hole is 130-150 mm, and the type of the sleeve is 105-125 multiplied by 5 mm.
As a still further scheme of the invention: the distance between grouting holes of the upper layer construction section, the middle layer construction section and the lower layer construction section is 1.8m, the row spacing is 4m, and the depth of the grouting holes is not lower than 7 m.
Compared with the prior art, the invention has the beneficial effects that: the invention carries out layer segmentation on the loose rock coal bed, the slurry concentration and the slurry injection quantity of the upper layer construction section and the lower layer construction section are less than those of the middle layer construction section, so that the middle layer construction section has higher reinforcing and bearing functions, the loosening and crushing among different coal beds can be effectively prevented, the slurry solidification condition in the drill hole is tested after the grouting is finished, the fan-shaped and broken line statistical graph is drawn according to the actual change values of the drill hole and before and after the grouting, the grouting effect is easy to test, and whether the grouting quality reaches the standard is known.
Detailed Description
In embodiment 1 of the invention, a grouting reinforcement method based on a loose rock coal seam comprises the following steps:
a: the upper part of a loose rock coal seam is sequentially divided into an upper layer construction section, a middle layer construction section and a lower layer construction section from top to bottom, holes are respectively drilled upwards along the inclination with the horizontal plane on the upper layer construction section, the middle layer construction section and the lower layer construction section, residues in the drilled holes are removed, a sleeve is arranged in each hole, 3 grouting holes are arranged in the upper layer construction section, 6 grouting holes are arranged in the middle layer construction section, and 4 grouting holes are arranged in the lower layer construction section;
b: installing a flow meter at the port of the casing, injecting the slurry into the drill hole through the casing, and determining the grouting range according to the diffusion radius of the slurry;
c: and (3) detecting the solidification condition of the slurry in the drilled holes, distributing the holes, continuing drilling and grouting when the number of the distributed holes is more than 15% of the number of the drilled holes, and then drawing a fan-shaped and broken line statistical graph according to the drilled holes and actual change values before and after grouting.
Preferably: and B, when the drilling and grouting are continuously operated, grouting is carried out immediately after one drilling hole is constructed, then another drilling hole is constructed, hole sealing of the hole opening is carried out correspondingly, and an exhaust pipe is inserted into the hole opening.
Preferably: in the step A, the slurry concentration of the middle layer construction section is greater than the slurry concentrations of the upper layer construction section and the lower layer construction section, and the slurry injection amount of the middle layer construction section is also greater than the slurry injection amounts of the upper layer construction section and the lower layer construction section.
Preferably: after grouting, the single drill hole is used for pulling out the sleeve in the inclined drill hole and sealing the hole, and meanwhile, the included angle between the inclined drill hole and the horizontal plane is 10 degrees.
Preferably: when the number of the distributed holes is more than 15% of the number of the drilled holes, whether the hole grouting speed is more than 5m or not is checked3If it is greater than 5m3And h, continuously punching and grouting.
Preferably: the hole diameter of the drilled hole is 135mm, and the type of the sleeve is 105-125 multiplied by 5 mm.
Preferably: the distance between grouting holes of the upper layer construction section, the middle layer construction section and the lower layer construction section is 1.8m, the row spacing is 4m, and the depth of the grouting holes is not less than 7 m.
In embodiment 2 of the invention, a grouting reinforcement method based on a loose rock coal seam comprises the following steps:
a: the upper part of a loose rock coal seam is sequentially divided into an upper layer construction section, a middle layer construction section and a lower layer construction section from top to bottom, holes are respectively drilled upwards along the inclination with the horizontal plane on the upper layer construction section, the middle layer construction section and the lower layer construction section, residues in the drilled holes are removed, a sleeve is arranged in each hole, 5 grouting holes are arranged in the upper layer construction section, 12 grouting holes are arranged in the middle layer construction section, and 6 grouting holes are arranged in the lower layer construction section;
b: installing a flow meter at the port of the casing, injecting the slurry into the drill hole through the casing, and determining the grouting range according to the diffusion radius of the slurry;
c: and (3) detecting the solidification condition of the slurry in the drilled holes, distributing the holes, continuing drilling and grouting when the number of the distributed holes is more than 15% of the number of the drilled holes, and then drawing a fan-shaped and broken line statistical graph according to the drilled holes and actual change values before and after grouting.
Preferably: and B, when the drilling and grouting are continuously operated, grouting is carried out immediately after one drilling hole is constructed, then another drilling hole is constructed, hole sealing of the hole opening is carried out correspondingly, and an exhaust pipe is inserted into the hole opening.
Preferably: in the step A, the slurry concentration of the middle layer construction section is greater than the slurry concentrations of the upper layer construction section and the lower layer construction section, and the slurry injection amount of the middle layer construction section is also greater than the slurry injection amounts of the upper layer construction section and the lower layer construction section.
Preferably: after grouting, the single drill hole is used for pulling out the sleeve in the inclined drill hole and sealing the hole, and meanwhile, the included angle between the inclined drill hole and the horizontal plane is 12 degrees.
Preferably: when the number of the distributed holes is more than 15% of the number of the drilled holes, whether the hole grouting speed is more than 5m or not is checked3If it is greater than 5m3And h, continuously punching and grouting.
Preferably: the hole diameter of the drilled hole is phi 145mm, and the type of the sleeve is phi 105-125 multiplied by 5 mm.
Preferably: the distance between grouting holes of the upper layer construction section, the middle layer construction section and the lower layer construction section is 1.8m, the row spacing is 4m, and the depth of the grouting holes is not less than 7 m.
The invention carries out layer segmentation on the loose rock coal bed, the slurry concentration and the slurry injection quantity of the upper layer construction section and the lower layer construction section are less than those of the middle layer construction section, so that the middle layer construction section has higher reinforcing and bearing functions, the loosening and crushing among different coal beds can be effectively prevented, the slurry solidification condition in a drill hole is tested after the grouting is finished, the fan-shaped and broken line statistical graph is drawn according to the drill hole and the actual change values before and after the grouting, the grouting effect is easy to test, and whether the grouting quality reaches the standard is known.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention are equivalent to or changed within the technical scope of the present invention.
Claims (7)
1. A grouting reinforcement method based on a loose rock coal seam is characterized by comprising the following steps:
a: the upper part of a loose rock coal seam is sequentially divided into an upper layer construction section, a middle layer construction section and a lower layer construction section from top to bottom, holes are respectively drilled in the upper layer construction section, the middle layer construction section and the lower layer construction section along the inclination with a horizontal plane, residues in the drilled holes are removed, a sleeve is arranged in each hole, 2-6 grouting holes are arranged in the upper layer construction section, 5-15 grouting holes are arranged in the middle layer construction section, and 3-7 grouting holes are arranged in the lower layer construction section;
b: installing a flow meter at the port of the casing, injecting the slurry into the drill hole through the casing, and determining the grouting range according to the diffusion radius of the slurry;
c: and (3) detecting the solidification condition of the slurry in the drilled holes, distributing the holes, continuing drilling and grouting when the number of the distributed holes is more than 15% of the number of the drilled holes, and then drawing a fan-shaped and broken line statistical graph according to the drilled holes and actual change values before and after grouting.
2. The loose rock coal seam grouting reinforcement method according to claim 1, wherein in the step B, when drilling grouting is continuously performed, grouting is performed immediately after one drilling hole is constructed, then another drilling hole is constructed, meanwhile, hole sealing is performed on the hole opening, and an exhaust pipe is inserted into the hole opening.
3. The loose rock coal seam-based grouting reinforcement method as claimed in claim 1, wherein in the step A, the slurry concentration of the middle construction section is greater than that of the upper construction section and that of the lower construction section, and the slurry injection amount of the middle construction section is greater than that of the upper construction section and that of the lower construction section.
4. The loose rock coal seam grouting reinforcement method as claimed in claim 2, wherein after grouting, the casing in the inclined drill hole is pulled out, then the hole opening is sealed, and meanwhile, the included angle between the inclined drill hole and the horizontal plane is 9-13 degrees.
5. The loose rock coal seam grouting reinforcement method as claimed in claim 1, wherein when the number of the distributed holes is more than 15% of the number of the drilled holes, whether the hole grouting speed is more than 5m or not is checked3If it is greater than 5m3And h, continuously punching and grouting.
6. The loose rock coal seam-based grouting reinforcement method of claim 1, wherein the bore diameter of the drilled hole is 130-150 mm, and the type of the casing is 105-125 x 5mm seamless stainless steel pipe.
7. The loose rock coal seam-based grouting reinforcement method of claim 1, wherein the distances between grouting holes of the upper layer construction section, the middle layer construction section and the lower layer construction section are all 1.8m, the row distances are all 4m, and the depth of the grouting holes is not less than 7 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011280450.2A CN112576192A (en) | 2020-11-16 | 2020-11-16 | Grouting reinforcement method based on loose rock coal seam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011280450.2A CN112576192A (en) | 2020-11-16 | 2020-11-16 | Grouting reinforcement method based on loose rock coal seam |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112576192A true CN112576192A (en) | 2021-03-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011280450.2A Pending CN112576192A (en) | 2020-11-16 | 2020-11-16 | Grouting reinforcement method based on loose rock coal seam |
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| Country | Link |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102235171A (en) * | 2011-08-09 | 2011-11-09 | 河南理工大学 | Method for reinforcing soft broken coal rock by directional grouting |
| CN103362117A (en) * | 2013-07-31 | 2013-10-23 | 中国神华能源股份有限公司 | Full-section grouting method for grouting section |
| CN104110038A (en) * | 2014-07-29 | 2014-10-22 | 上海市建工设计研究院有限公司 | Construction method for large-area pit support structure in deep-sludge type soft soil area |
| CN106677160A (en) * | 2016-11-18 | 2017-05-17 | 山东大学 | Series mold bag retrusive type subsection slip casting device and slip casting method |
| CN106761903A (en) * | 2016-12-27 | 2017-05-31 | 山西晋城无烟煤矿业集团有限责任公司 | The compound crossing-hole gas extraction method of weak seam |
| CN108952727A (en) * | 2018-05-25 | 2018-12-07 | 淮矿西部煤矿投资管理有限公司 | A kind of grouting water blocking method of the vertical creviced formation of high inclination-angle |
| CN111042831A (en) * | 2019-08-20 | 2020-04-21 | 北京龙软科技股份有限公司 | Grouting reinforcement transformation method for coal seam floor limestone confined aquifer |
-
2020
- 2020-11-16 CN CN202011280450.2A patent/CN112576192A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102235171A (en) * | 2011-08-09 | 2011-11-09 | 河南理工大学 | Method for reinforcing soft broken coal rock by directional grouting |
| CN103362117A (en) * | 2013-07-31 | 2013-10-23 | 中国神华能源股份有限公司 | Full-section grouting method for grouting section |
| CN104110038A (en) * | 2014-07-29 | 2014-10-22 | 上海市建工设计研究院有限公司 | Construction method for large-area pit support structure in deep-sludge type soft soil area |
| CN106677160A (en) * | 2016-11-18 | 2017-05-17 | 山东大学 | Series mold bag retrusive type subsection slip casting device and slip casting method |
| CN106761903A (en) * | 2016-12-27 | 2017-05-31 | 山西晋城无烟煤矿业集团有限责任公司 | The compound crossing-hole gas extraction method of weak seam |
| CN108952727A (en) * | 2018-05-25 | 2018-12-07 | 淮矿西部煤矿投资管理有限公司 | A kind of grouting water blocking method of the vertical creviced formation of high inclination-angle |
| CN111042831A (en) * | 2019-08-20 | 2020-04-21 | 北京龙软科技股份有限公司 | Grouting reinforcement transformation method for coal seam floor limestone confined aquifer |
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Application publication date: 20210330 |
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