CN103742172A - Method for blocking hydrogen-sulfide-contained water bursting point on bottom plate in grouting mode - Google Patents
Method for blocking hydrogen-sulfide-contained water bursting point on bottom plate in grouting mode Download PDFInfo
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- CN103742172A CN103742172A CN201310646552.5A CN201310646552A CN103742172A CN 103742172 A CN103742172 A CN 103742172A CN 201310646552 A CN201310646552 A CN 201310646552A CN 103742172 A CN103742172 A CN 103742172A
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Abstract
The invention provides a method for blocking a hydrogen-sulfide-contained water bursting point on a bottom plate in a grouting mode. The method includes the steps of firstly, carrying out primary hole drilling on the water bursting point, wherein the drilling direction is perpendicularly downward, and the drilling depth is smaller than the thickness M of a water-resisting layer of the bottom plate; secondly, grouting two types of size including cement and water glass into a primarily-drilled hole to conduct rapid grouting blocking, and carrying out secondary hole drilling to the position below the bottom of the water-bearing layer of the bottom plate after the size in the primarily-drilled hole solidifies, wherein the aperture of a secondarily-drilled hole is smaller than that of the primarily-drilled hole, and the drilling direction of the secondary drilling is perpendicularly downward; thirdly, grouting the size formed by clay, quick lime and desulphurization ash into the water-bearing layer, carrying out hole bottom cleaning on the portion, located in the water-resisting layer of the bottom plate, of the secondarily-drilled hole after the secondary grouting is completed, and then conducting cement hole sealing and reinforcing on the cleaned portion of the secondarily-drilled hole; fourthly, blocking a water bursting passageway of the water bursting point.
Description
Technical field:
The present invention relates to mine hydrogeology field, relate in particular to the method for floor grouting shutoff hydrogen sulfide projective water point.
Background technology:
The base plate that tunnel discloses has water guide crack natural or that driving brings out, after tunnel forms, the water body of base plate can be gushed out continuously, some water body is near coal measure strata, element sulphur in coal measure strata can slowly be hydrolyzed and produce hydrogen sulfide gas in water, and hydrogen sulfide is soluble in water, along with base plate water burst, in tunnel, concentration of hydrogen sulfide can increase to some extent, serious threat operating personnel safety, and mining metal instrument is corrosive.At present, for projective water point, often adopt the mixture of cement and other materials directly to carry out disposable shutoff, but when being rich in hydrogen sulfide gas in water, there is following problem in the method:
1) cement is that main slurries are difficult for rapid condensation under gushing water environment, effectively spreads radius little, and then cannot complete the effective shutoff to gushing water aquifer.
2) when slip casting, projective water point is zone of fracture, and disposable slip casting is difficult to ensure the effect of slip casting, easily causes running pulp, cannot reach grouting pressure.
3) while containing certain cement composition in slurries, the aqueous solution of hydrogen sulfide gas is acid, and cement is corrosive, and after slip casting, durability is poor, easily cause hydrogen sulfide to overflow, and the hydrogen sulfide of minute quantity also can be detrimental to health.
4) cement can not less hole, the crack of shutoff, so after grout off, whole sealing is poor, easily causes hydrogen sulfide to overflow.
Summary of the invention
The present invention, in order to address the above problem, provides a kind of method of floor grouting shutoff hydrogen sulfide projective water point.
The present invention is by the following technical solutions:
A kind of method of floor grouting shutoff sulfide hydrogen projective water point, first at projective water point, implement boring for the first time, probing direction is for vertically downward, drilling depth is less than the thickness M of base plate water barrier, then in boring for the first time, the two slurries of injection cement and water glass carry out quick injection hole sealing, after the slurries in holing for the first time solidify, implement boring for the second time, the aperture of boring is less than the aperture of boring for the first time for the second time, the probing direction of the second boring is for vertically downward, be drilled to below bottom, base plate aquifer, then with clay, quicklime, the slurries that solid sulfur ash forms carry out slip casting to aquifer, after slip casting completes for the second time, the part of holing for the second time in base plate water barrier is carried out to cleaning bottom of hole, again the cleaning bottom of hole of holing for the second time is partly carried out to cementing reinforcing.
The final grouting pressure of drilling holes and late grouting is 1～2.5MPa for the first time.
In slip casting, the volume ratio of cement and water glass is 1:0.4～1:1 for the first time.
In slip casting, described cement is Portland cement PO42.5 or Portland cement PO52.5 for the first time, and water/binder ratio is 0.6:1～1.2:1, and concentration of sodium silicate is 30～40 ° of Be ', and modulus is 2.4～3.4.
The aperture of boring is less than the aperture of boring for the first time for the second time, but is greater than 65mm.
Slip casting is for the second time band pressure grouting, and grouting pressure is 0.5～2MPa.
The final grouting pressure of slip casting is for the second time greater than 2 times of hydrostatic pressure P that base plate aquifer imposes on base plate water barrier.
The index of plasticity of the clay that slip casting is for the second time used is 7～15, according to quality meter, and clay: the summation of quicklime and solid sulfur ash is 12:1～9:1, the mass ratio of quicklime and solid sulfur ash is 0.8:1～1.2:1.
The proportion of slip casting slurries used is 1.1～1.4g/cm for the second time
3, viscosity is 15～22s, bleed rate is less than 5%.
Before boring for the first time, near projective water point, add forced ventilation, the sprinkling of ground alkali lye, make sulfureted hydrogen gas concentration be reduced to the safe range below 0.00066%.
Compared with prior art, beneficial effect of the present invention is: 1) secondary pore-forming, has improved slip casting efficiency; 2) first injecting clay is main slurries, compared with cement, is main slurries, and slurries easily flow, easily precipitate, and have effectively reduced overflowing of hydrogen sulfide gas, and safety is secure; 3) clay first injecting is that main slurries are main slurries compared with cement, and price is lower, cost-saving; 4) finally inject cementing, can improve near the intensity of projective water point, reduce again the possibility of gushing water.
Accompanying drawing explanation:
Fig. 1 is flow chart of the present invention;
Fig. 2 is schematic diagram of the present invention.
In figure 1, base plate water barrier, 2, base plate aquifer, 3, gushing water passage, 4, projective water point, 5, boring for the first time, 6, boring for the second time.
The specific embodiment:
As shown in Figure 1 and Figure 2, a kind of method of floor grouting shutoff hydrogen sulfide projective water point, comprises the steps:
Step 1: according to the water quality detection result of projective water point 4, determine that the source of bursting water of projective water point 4 is in base plate aquifer 2.And detect achievement by coal field geology, from bore hole columnar section, obtain the thickness M of the base plate water barrier 1 between projective water point 4 and base plate aquifer 2, the base plate water barrier 1 hydrostatic pressure P that base plate aquifer 2 applies that bears.
Near near step 2: add forced ventilation, the sprinkling of ground alkali lye projective water point 4, make to reach set construction operation environment projective water point, sulfureted hydrogen gas concentration is reduced to the safe range below 0.00066%.
Step 3: at projective water point 4 places, implement to hole for the first time 5, boring aperture is more than 108mm, and probing direction is for vertically downward, and drilling depth is 80%～90% of impermeable layer thickness M.
Step 4: to the two slurries of hole for the first time 5 injection cement and water glass, carry out quick injection hole sealing, final grouting pressure 1～2.5MPa, wherein cement is Portland cement PO42.5 or Portland cement PO52.5, water/binder ratio is 0.6:1～1.2:1, concentration of sodium silicate is 30～40 ° of Be ', and modulus is 2.4～3.4, and the volume ratio of cement and water glass is 1:0.4～1:1.
Step 5: the two slurries of cement-sodium silicate that inject in 5 for the treatment of to hole for the first time condense more than 5 days, then holing for the first time two slurries condensing zones middle part of 5, implement to hole for the second time 6, boring aperture is less than holes 5 for the first time, but be greater than 65mm, probing direction, for vertically downward, is drilled to the following 1～3m in 2 bottoms, base plate aquifer.
Step 6: by holing for the second time 6, it is main adopting clay, add the slurries of a small amount of quicklime, solid sulfur ash, slip casting is carried out in base plate aquifer 2, grouting pressure is at 0.5～2MPa, and final grouting pressure should be greater than 2 times of hydrostatic pressure P in base plate aquifer 2, and the index of plasticity of clay is 7～15, the mass ratio of clay and interpolation material (add material and refer to quicklime and solid sulfur ash) is 12:1～9:1, and the mass ratio of quicklime and solid sulfur ash is 0.8:1～1.2:1.This clay slurry (being the slurries of secondary grouting) performance is adjustable in following scope: proportion is at 1.1～1.4g/cm
3, viscosity is 15～22s, bleed rate is less than 5%.
Step 7: complete after slip casting, 6 parts in base plate water barrier 1 of holing are for the second time carried out to cleaning bottom of hole, then 6 cleaning bottom of holes of holing for the second time are partly carried out to cementing reinforcing, cement adopts Portland cement PO42.5 or Portland cement PO52.5.
Step 8: complete the shutoff to the gushing water passage 3 of projective water point 4, the potential gushing water water damage of effectively controlling and hydrogen sulfide gas are overflowed, the safety problem that transfinites and bring.
Operation logic:
Implement to hole for the first time 5 aperture is larger, can control in a big way gushing water passage 3 and other potential gushing water passages.Hole for the first time and 5 carry out the two slurries sealing of holes of cement, water glass, the setting time that compares etc. controlled pair of slurries by adjusting cement type, water/binder ratio, concentration of sodium silicate, cement paste and water glass, and then can rapid condensation in the limited gushing water passage of base plate water barrier 1, and then reinforce broken base plate water barrier 1, for boring for the second time, be with pressure grouting withstand voltage basis is provided, prevent that grouting pressure is opened potential gushing water passage for the second time, running pulp phenomenon occurs, make slip casting Efficiency Decreasing for the second time.It is main that 6 the injecting paste material of holing is for the second time chosen clay, because clay slurry diffusivity is good, good at circumstance of flowing water stability inferior, easily precipitate, and to less hole, there is packing action in crack, whole shutoff is good, and traditional cement to be main slurries be difficult for quick-speed large-scale in the strong aquifer of hydrodynamic force solidifies, the aqueous solution corrosion of hydrogen easily cures, and can not effectively reinforce less hole, crack, therefore clay be main slurries compare traditional cement be main slurries can be under the moving water condition in base plate aquifer 2 shutoff water body prevent hydrogen sulfide gas diffusion on a large scale.Clay is that main slip casting is added quicklime and solid sulfur ash in material and contained the compositions such as calcium oxide, can absorb hydrogen sulfide gas in water, increase the stability of slurries, in solid sulfur ash, there are anhydrite and free calcium oxide aquation to have dilatancy simultaneously, improve the plugging effect of slurries, be conducive to prevent hydrogen sulfide gas diffusion.After slip casting, injected hole is carried out to cleaning bottom of hole, remove 1 section of clay slurry of boring water barrier, and replace injection cement grout and reinforce, made up the feature of the strength deficiency of clay slurry, effectively prevent secondary gushing water.
Claims (10)
1. the method for a floor grouting shutoff sulfide hydrogen projective water point, it is characterized in that: first at projective water point, implement boring for the first time, probing direction is for vertically downward, drilling depth is less than the thickness M of base plate water barrier, then in boring for the first time, the two slurries of injection cement and water glass carry out quick injection hole sealing, after the slurries in holing for the first time solidify, implement boring for the second time, the aperture of boring is less than the aperture of boring for the first time for the second time, the probing direction of the second boring is for vertically downward, be drilled to below bottom, base plate aquifer, then with clay, quicklime, the slurries that solid sulfur ash forms carry out slip casting to aquifer, after slip casting completes for the second time, the part of holing for the second time in base plate water barrier is carried out to cleaning bottom of hole, again the cleaning bottom of hole of holing for the second time is partly carried out to cementing reinforcing.
2. the method for a kind of floor grouting shutoff sulfide hydrogen projective water point according to claim 1, is characterized in that: the final grouting pressure of drilling holes and late grouting is 1～2.5MPa for the first time.
3. the method for a kind of floor grouting shutoff sulfide hydrogen projective water point according to claim 1, is characterized in that: in slip casting, the volume ratio of cement and water glass is 1:0.4～1:1 for the first time.
4. according to the method for a kind of floor grouting shutoff sulfide hydrogen projective water point described in claim 1 or 3, it is characterized in that: for the first time in slip casting, described cement is Portland cement PO42.5 or Portland cement PO52.5, water/binder ratio is 0.6:1～1.2:1, concentration of sodium silicate is 30～40 ° of Be ', and modulus is 2.4～3.4.
5. the method for a kind of floor grouting shutoff sulfide hydrogen projective water point according to claim 1, is characterized in that: the aperture of boring is less than the aperture of boring for the first time for the second time, but is greater than 65mm.
6. the method for a kind of floor grouting shutoff sulfide hydrogen projective water point according to claim 1, is characterized in that: slip casting is for the second time band pressure grouting, and grouting pressure is 0.5～2MPa.
7. according to the method for a kind of floor grouting shutoff sulfide hydrogen projective water point described in claim 1 or 6, it is characterized in that: the final grouting pressure of slip casting is for the second time greater than 2 times of hydrostatic pressure P that base plate aquifer imposes on base plate water barrier.
8. according to the method for a kind of floor grouting shutoff sulfide hydrogen projective water point described in claim 1 or 6, it is characterized in that: the index of plasticity of the clay that slip casting is for the second time used is 7～15, according to quality meter, clay: the summation of quicklime and solid sulfur ash is 12:1～9:1, the mass ratio of quicklime and solid sulfur ash is 0.8:1～1.2:1.
9. the method for a kind of floor grouting shutoff sulfide hydrogen projective water point according to claim 8, is characterized in that: the proportion of slip casting slurries used is 1.1～1.4g/cm for the second time
3, viscosity is 15～22s, bleed rate is less than 5%.
10. the method for a kind of floor grouting shutoff sulfide hydrogen projective water point according to claim 1, it is characterized in that: before boring for the first time, near projective water point, add forced ventilation, the sprinkling of ground alkali lye, make sulfureted hydrogen gas concentration be reduced to the safe range below 0.00066%.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104712286A (en) * | 2014-12-31 | 2015-06-17 | 陕西煤业化工技术研究院有限责任公司 | Classified grouting method utilizing results of coal seam floor water-bearing layer single-hole water discharge test |
| CN105507907A (en) * | 2016-01-29 | 2016-04-20 | 中铁一局集团有限公司 | Method for reducing hydrogen sulfide emission in tunnel construction |
| CN106593489A (en) * | 2016-12-02 | 2017-04-26 | 淮北矿业股份有限公司 | Difficult mining coal seam bottom plate thin layer limestone high-pressure strong aquifer karst fissure aggregate perfusion method |
| CN106761748A (en) * | 2016-12-02 | 2017-05-31 | 淮北矿业股份有限公司 | A kind of deep mining coal seam Hidden Karst Under karst collapse col umn method for blocking |
| CN108252729A (en) * | 2018-01-30 | 2018-07-06 | 临沂矿业集团有限责任公司 | A kind of prevention high pressure projective water point is without press seal wall |
| CN108301807A (en) * | 2018-04-24 | 2018-07-20 | 中煤科工集团重庆研究院有限公司 | Hole wall fixing device for gas extraction drill hole of soft coal seam and construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104712286A (en) * | 2014-12-31 | 2015-06-17 | 陕西煤业化工技术研究院有限责任公司 | Classified grouting method utilizing results of coal seam floor water-bearing layer single-hole water discharge test |
| CN104712286B (en) * | 2014-12-31 | 2017-05-10 | 陕西煤业化工技术研究院有限责任公司 | Classified grouting method utilizing results of coal seam floor water-bearing layer single-hole water discharge test |
| CN105507907A (en) * | 2016-01-29 | 2016-04-20 | 中铁一局集团有限公司 | Method for reducing hydrogen sulfide emission in tunnel construction |
| CN106593489A (en) * | 2016-12-02 | 2017-04-26 | 淮北矿业股份有限公司 | Difficult mining coal seam bottom plate thin layer limestone high-pressure strong aquifer karst fissure aggregate perfusion method |
| CN106761748A (en) * | 2016-12-02 | 2017-05-31 | 淮北矿业股份有限公司 | A kind of deep mining coal seam Hidden Karst Under karst collapse col umn method for blocking |
| CN108252729A (en) * | 2018-01-30 | 2018-07-06 | 临沂矿业集团有限责任公司 | A kind of prevention high pressure projective water point is without press seal wall |
| CN108301807A (en) * | 2018-04-24 | 2018-07-20 | 中煤科工集团重庆研究院有限公司 | Hole wall fixing device for gas extraction drill hole of soft coal seam and construction method |
| CN108301807B (en) * | 2018-04-24 | 2020-01-24 | 中煤科工集团重庆研究院有限公司 | Hole wall fixing device for gas extraction drill hole of soft coal seam and construction method |
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