CN113294176B - Grouting amount calculating method for grouting reconstruction engineering of coal seam roof - Google Patents
Grouting amount calculating method for grouting reconstruction engineering of coal seam roof Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 41
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000011435 rock Substances 0.000 claims description 14
- 238000005056 compaction Methods 0.000 claims description 3
- 238000005065 mining Methods 0.000 abstract description 4
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
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- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
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Abstract
The invention discloses a grouting amount calculating method for a coal seam roof grouting reconstruction project, which comprises the following steps: s1, lithology thickness statistics of horizontal branch holes; s2, building different lithology grouting amount calculation templates; s3, establishing a crack development section grouting amount calculation template; s4, building a grouting amount calculation template of the branch hole of the grouting reconstruction of the coal seam roof; s5, based on the steps S1-S4, the grouting quantity of the branch holes is obtained through grouting reconstruction of the coal seam roof, the method is suitable for the technical field of coal mining, the data acquisition path is simple, the practicability of the data calculation method is high, the region correction coefficients can be properly adjusted according to the change of geological conditions of different regions, and the method can be directly applied and has high popularization; the method and the program for calculating the grouting quantity are convenient and practical, a foundation is laid for the grouting reconstruction engineering of the coal seam roof, the grouting reconstruction engineering of the coal seam roof has water shutoff and water reduction effects, the method is a novel coal mine water control method, the grouting process can be optimized, and scientific and accurate grouting is realized.
Description
Technical Field
The invention belongs to the technical field of coal mining, and particularly relates to a grouting amount calculating method for a coal seam roof grouting reconstruction project.
Background
Along with the continuous development of the China coal industry, the hydrogeological conditions of the coal mining field are gradually changed from simple type to complex type, and the burial depth conditions of the coal bed are also changed from shallow burial to deep burial. At present, a plurality of coal bases in the middle and west of China represented by Huang Long coal fields are gradually developed along with the construction and production of mines in areas, and in recent years, roof water damage accidents occur in a plurality of mines, so that the mine construction is seriously delayed, mining equipment is flooded and damaged, production is reduced by working face production stopping and the like, and serious economic loss and safety threat are caused to the mines.
Along with the gradual development of mine construction and production, the actual disclosure of production of the mine with simple hydrogeological conditions proves that the mine with complex hydrogeological conditions is seriously inconsistent with the conclusion of prior research, the actual water inflow of the mine is larger than the expected result in advance, and the adoption of mature water prevention and control technical measures can not effectively prevent and control the water damage of the mine roof, so that the mine water prevention and control work and the safety production are brought with larger pressure.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a grouting amount calculating method for a grouting reconstruction project of a coal seam roof.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the grouting amount calculating method for the grouting reconstruction engineering of the coal seam roof comprises the following steps:
s1, lithology thickness statistics of horizontal branch holes;
s2, building different lithology grouting amount calculation templates;
s3, establishing a crack development section grouting amount calculation template;
s4, building a grouting amount calculation template of the branch hole of the grouting reconstruction of the coal seam roof;
s5, based on the steps S1-S4, the grouting quantity of the branch holes of the grouting reconstruction of the coal seam roof is obtained.
Preferably, the statistics of lithology thickness of the S1 horizontal branch hole include:
dividing the lithology of the seam roof grouting reconstruction target zone interval into three types, namely mudstone, a permeable layer and a compact layer; counting the accumulated thickness values of the same lithology, and marking the accumulated thickness values of the mudstone, the permeable layer and the compact layer as Hm, hs and Hd in sequence;
and respectively solving density functions of the permeable layer and the compact layer:
fs＝Hs/(Hm+Hs+Hd)；
fd＝Hd/(Hm+Hs+Hd)；
wherein, fs: density of the permeation layer, decimal; fd: density of dense layer, decimal.
Preferably, the different lithology grouting amount calculation template comprises:
permeable rock grouting amount: qs=cs (2.83fs+0.45) Hs;
compact rock grouting amount: qd=cd (-2.12fd+1.74) Hd;
wherein, qs: the grouting amount of permeable rock, t; qd is compact rock grouting amount, t; cs is the sandstone cementation coefficient, dimensionless, and has a value of 0.7-1.5; cd: compact layer compaction coefficient, dimensionless, and value between 0.8 and 1.2.
Preferably, the crack development section grouting amount calculating template comprises:
grouting amount of crack development section: qf=cf (-0.9pt+8.05) Hf;
wherein, qf: grouting amount of crack development section, t; pt is the water pressure of the crack section, and MPa; hf, crack development segment length, m; cf is the regional correction coefficient, dimensionless, and takes a value between 0.5 and 2.0.
Preferably, the calculation template for grouting the roof of the coal seam to reconstruct the branch hole grouting amount comprises:
Q total (S) ＝Qf+Qs+Qd。
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
the data acquisition method is simple, the data calculation method is high in practicability, the regional correction coefficients can be properly adjusted according to the change of geological conditions of different regions, the method can be directly applied, and the method is high in popularization;
the invention can calculate the grouting quantity of the branch holes of the grouting reconstruction of the coal seam roof more accurately, provides a convenient and practical calculation method and a program of the grouting quantity, creates a foundation for the grouting reconstruction engineering of the coal seam roof, ensures that the grouting reconstruction engineering of the coal seam roof has the water shutoff and water reduction effects, becomes a new coal mine water control method, can optimize the grouting process and achieves scientific and accurate grouting.
Drawings
FIG. 1 is a flow chart of a method for calculating grouting amount in a coal seam roof grouting reconstruction project according to the invention;
Detailed Description
The following describes a concrete embodiment of the grouting amount calculating method for the coal seam roof grouting reconstruction project with reference to fig. 1. The grouting amount calculating method for the coal seam roof grouting reconstruction project is not limited to the description of the following embodiments.
Examples:
the embodiment provides a concrete structure of a grouting amount calculating method for a grouting reconstruction project of a coal seam roof, as shown in fig. 1, comprising the following steps:
s1, lithology thickness statistics of horizontal branch holes;
s2, building different lithology grouting amount calculation templates;
s3, establishing a crack development section grouting amount calculation template;
s4, building a grouting amount calculation template of the branch hole of the grouting reconstruction of the coal seam roof;
s5, based on the steps S1-S4, the grouting quantity of the branch holes of the grouting reconstruction of the coal seam roof is obtained.
Specifically, the S1 horizontal branch hole lithology thickness statistics comprise:
dividing the lithology of the seam roof grouting reconstruction target zone interval into three types, namely mudstone, a permeable layer and a compact layer; counting the accumulated thickness values of the same lithology, and marking the accumulated thickness values of the mudstone, the permeable layer and the compact layer as Hm, hs and Hd in sequence;
and respectively solving density functions of the permeable layer and the compact layer:
fs＝Hs/(Hm+Hs+Hd)；
fd＝Hd/(Hm+Hs+Hd)；
wherein, fs: density of the permeation layer, decimal; fd: density of dense layer, decimal.
Specifically, the different lithology grouting amount calculation templates comprise:
permeable rock grouting amount: qs=cs (2.83fs+0.45) Hs;
compact rock grouting amount: qd=cd (-2.12fd+1.74) Hd;
wherein, qs: the grouting amount of permeable rock, t; qd is compact rock grouting amount, t; cs is the sandstone cementation coefficient, dimensionless, and has a value of 0.7-1.5; cd: compact layer compaction coefficient, dimensionless, and value between 0.8 and 1.2.
Further, the crack development section grouting amount calculating template comprises:
grouting amount of crack development section: qf=cf (-0.9pt+8.05) Hf;
wherein, qf: grouting amount of crack development section, t; pt is the water pressure of the crack section, and MPa; hf, crack development segment length, m; cf is the regional correction coefficient, dimensionless, and takes a value between 0.5 and 2.0.
Further, the calculation template for grouting the top plate of the coal seam to reconstruct the grouting amount of the branch hole comprises the following components:
Q total (S) ＝Qf+Qs+Qd。
Working principle:
as shown in fig. 1, firstly, the lithology of a seam roof grouting reconstruction target zone interval is divided into three categories, namely mudstone, a permeable layer and a compact layer; counting the accumulated thickness values of the same lithology, and marking the accumulated thickness values of the mudstone, the permeable layer and the compact layer as Hm, hs and Hd in sequence;
and respectively solving density functions of the permeable layer and the compact layer:
fs＝Hs/(Hm+Hs+Hd)；
fd＝Hd/(Hm+Hs+Hd)；
then, the permeable rock grouting amount is calculated respectively: qs=cs (2.83fs+0.45) Hs; and
Compact rock grouting amount: qd=cd (-2.12fd+1.74) Hd;
next, the crack growth stage grouting amount was calculated: qf=cf (-0.9pt+8.05) Hf;
finally, based on Q Total (S) And (3) obtaining grouting quantity of the branch hole for grouting transformation of the coal seam roof by using the method of the combination of Qf, qs and Qd.
The data acquisition method is simple, the data calculation method is high in practicability, the regional correction coefficients can be properly adjusted according to the change of geological conditions of different regions, the method can be directly applied, and the method is high in popularization;
the invention can calculate the grouting amount of the branch hole of the grouting reconstruction of the coal seam roof more accurately, provides a convenient and practical calculation method and program of the grouting amount, lays a foundation for the grouting reconstruction engineering of the coal seam roof, ensures that the grouting reconstruction engineering of the coal seam roof has water shutoff and water reduction effects, becomes a new coal mine water control method, can optimize the grouting process and achieves scientific and accurate grouting.
The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.
Claims (1)
1. The grouting amount calculating method for the grouting reconstruction engineering of the coal seam roof is characterized by comprising the following steps of:
s1, lithology thickness statistics of horizontal branch holes;
s2, building different lithology grouting amount calculation templates;
s3, establishing a crack development section grouting amount calculation template;
s4, building a grouting amount calculation template of the branch hole of the grouting reconstruction of the coal seam roof;
s5, based on the steps S1-S4, obtaining grouting quantity of a branch hole of the grouting reconstruction of the coal seam roof;
the S1 horizontal branch hole lithology thickness statistics comprise:
dividing the lithology of the seam roof grouting reconstruction target zone interval into three types, namely mudstone, a permeable layer and a compact layer; counting the accumulated thickness values of the same lithology, and marking the accumulated thickness values of the mudstone, the permeable layer and the compact layer as Hm, hs and Hd in sequence;
and respectively solving density functions of the permeable layer and the compact layer:
fs＝Hs/(Hm+Hs+Hd)；
fd＝Hd/(Hm+Hs+Hd)；
wherein, fs: density of the permeation layer, decimal; fd: density of dense layer, decimal;
the different lithology grouting amount calculation template comprises:
permeable rock grouting amount: qs=cs (2.83fs+0.45) Hs;
compact rock grouting amount: qd=cd (-2.12fd+1.74) Hd;
wherein, qs: the grouting amount of permeable rock, t; qd is compact rock grouting amount, t; cs is the sandstone cementation coefficient, dimensionless, and has a value of 0.7-1.5; cd: compact layer compaction coefficient, dimensionless, value between 0.8 and 1.2;
the crack development section grouting amount calculating template comprises:
grouting amount of crack development section: qf=cf (-0.9pt+8.05) Hf;
wherein, qf: grouting amount of crack development section, t; pt is the water pressure of the crack section, and MPa; hf, crack development segment length, m; cf is an area correction coefficient, the dimensionless value is between 0.5 and 2.0;
the calculation template for grouting calculation of the branch hole of grouting reconstruction of the coal seam roof comprises:
Q total (S) ＝Qf+Qs+Qd。
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105401971A (en) * | 2015-09-02 | 2016-03-16 | 煤科集团沈阳研究院有限公司 | Surface and underground combined regional grouting method |
| CN112127909A (en) * | 2020-09-08 | 2020-12-25 | 河海大学 | Accurate grouting repairing and reinforcing method for broken surrounding rock of tunnel |
| CN112377221A (en) * | 2020-10-30 | 2021-02-19 | 中煤科工集团西安研究院有限公司 | Method for inhibiting development of water guide crack belt by grouting before mining and building key layer of structure |
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| AUPR576501A0 (en) * | 2001-06-18 | 2001-07-12 | Russell Mineral Equipment Pty Ltd | Rock bolting apparatus and method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105401971A (en) * | 2015-09-02 | 2016-03-16 | 煤科集团沈阳研究院有限公司 | Surface and underground combined regional grouting method |
| CN112127909A (en) * | 2020-09-08 | 2020-12-25 | 河海大学 | Accurate grouting repairing and reinforcing method for broken surrounding rock of tunnel |
| CN112377221A (en) * | 2020-10-30 | 2021-02-19 | 中煤科工集团西安研究院有限公司 | Method for inhibiting development of water guide crack belt by grouting before mining and building key layer of structure |
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