CN103628912A - Goaf management filling grouting construction method - Google Patents

Goaf management filling grouting construction method Download PDF

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Publication number
CN103628912A
CN103628912A CN201310537073.XA CN201310537073A CN103628912A CN 103628912 A CN103628912 A CN 103628912A CN 201310537073 A CN201310537073 A CN 201310537073A CN 103628912 A CN103628912 A CN 103628912A
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China
Prior art keywords
goaf
grouting
construction
filling
fly ash
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CN201310537073.XA
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CN103628912B (en
Inventor
朱品安
周兵
石艳军
苟永平
童耀
张栋
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GEZHOUBA GROUP FOUNDATION ENGINEERING Co Ltd
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GEZHOUBA GROUP FOUNDATION ENGINEERING Co Ltd
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Abstract

The invention discloses a goaf management grouting filling construction method. The method includes the following steps that construction preparation is conducted before drilling; filling grouting holes are formed and lofting drilling hole positions in a goaf are measured within the management range of the goaf; a covering layer and a bed rock section of the goaf are drilled; drill holes in the goaf are flushed; grouting is conducted on the interior of the goaf through the drill holes, cement fly ash slurry with high-content fly ash is adopted for grouting, wherein the water solid ratio of cement fly ash slurry is 0.8:1 or 1:1, and the weight ratio of cement to fly ash is 0.15:0.85; grouting quality is inspected. According to the goaf management grouting filling construction method, the engineering geological problems in the goaf are effectively solved through a drilling grouting method, further caving-in of overlying rock mass is stopped, and surface subsidence or collapse is avoided, and operation safety of buildings which pass the goaf is guaranteed.

Description

The construction method of filling grouting is processed in a kind of goaf
Technical field
The present invention relates to a kind of goaf and process the construction method of filling grouting, belong to based process and the geological hazard control field of hydraulic engineering and corresponding engineering.
Background technology
Along with greatly developing of national basis construction, engineering addressing and geological conditions become increasingly complex, and a large amount of exploitations of mineral resources makes Goaf Area area increasing.And a series of environmental geotechnical geological problems that cause due to gob collapse as land subsidence, road cracking, plough and reduce etc., often have a strong impact on the people's normal life, cause heavy economic losses.
On goaf, build the experience of engineering, especially hydraulic engineering both at home and abroad seldom, without ripe construction experience, and do not have relevant Regulations and the technical bid will definitely reference.Route is large hydraulic engineering, and engineering requires high at secure context, carry out engineering addressing Shi, Route Henan Province Yuzhou section and cannot avoid goaf.
Summary of the invention
Technical problem to be solved by this invention is to provide the construction method that filling grouting is processed in a kind of goaf, adopt boring grouting method to efficiently solve the engineering geological problems in goaf, to stop the further inbreak of upper overlying strata body, prevent surface settlement or subside, guaranteeing the security of operation through building on goaf.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: the construction method of filling grouting is processed in a kind of goaf, and the method comprises the following steps:
1) preparation of construction before boring;
2) in the process range of goaf, arrange filling grout hole, measure the setting-out drilling hole position in goaf;
3) covering layer in goaf and rock section are holed;
4) boring in goaf is rinsed;
5) by boring, grouting treatment is carried out in inside, goaf: it is the Cement fly ash of the high fly ash of 0.8:1 or 1:1, wherein cement that grouting adopts water-solid ratio: the weight ratio of flyash is 0.15:0.85;
6) grouting quality inspection.
In step 3), for the different lithology feature of coal mined-out area overlying strata, adopt respectively alloy bit, diamond thin-wall drill bit, full section alloy or diamond bit, and adopt bentonite slurry as circulation fluid retaining wall.
In step 5), adopt ground slurry preparing station system to join Cement fly ash,, adopt pressure grout method to be in the milk.
Grouting obstruction mode before grouting is used " aperture sealing method " and " like flange method ".
The construction method of filling grouting is processed in a kind of goaf provided by the invention, and beneficial effect is as follows:
1, in the process range of goaf, arrange filling grout hole, space and goaf fault zone, caving zone by slip casing by pressure normal direction rock stratum and adopt empty part and inject the slurry material with better filling performance and bonding capacity, after slurries sclerosis, form the supporter with some strength, overlying strata body on goaf is formed to supporting role, to stop the further inbreak of upper overlying strata body, prevent surface settlement or subside, guarantee the security of operation through building on goaf (structure); Adopt boring grouting method to efficiently solve the engineering geological problems in goaf, to stop the further inbreak of upper overlying strata body, prevent surface settlement or subside, guarantee the security of operation through building on goaf.
2, for the different lithological characteristic of overburden of the goaf (loam layer, boulder bed, rock section etc.), adopt respectively alloy bit, diamond thin-wall drill bit, full section alloy or diamond bit, and be aided with bentonite slurry as circulation retaining wall liquid, effectively solved the rapidly and efficiently problem of pore-forming of goaf coal measure strata.
3, filling grouting adopts the Cement fly ash of high fly ash, and doping quantity of fly ash, up to 85%, has not only reduced the cost of raw material, has solved preferably again the depression stable problem of overlying strata body on goaf.
4, according to the large feature of goaf filling grouting amount, adopted the ground slurry preparing station system that slurrying efficiency is higher to join Cement fly ash, meet the filling successional requirement of being in the milk, improved filling grouting construction work efficiency, and guaranteed the construction quality of filling grouting.
5, it is easy to operation that mode is blocked in the grouting before grouting: the effect of orifice tube of having held concurrently of borehole wall-protection sleeve pipe, directly connecting aperture locking device can be in the milk, easy to operation, and has saved to a certain extent material and process costs.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described:
Fig. 1 is construction flow chart of the present invention.
The specific embodiment
A construction method for filling grouting is processed in goaf, and the method is comprised of following steps:
1) preparation of construction before boring, preparation is as follows:
1-1) build operation platform: adopt channel-section steel or i iron welding to form the larger operation platform of supporting surface, and with
The whole bolt of the frame of rig connects, the construction stability requirement when guaranteeing high mast operation.
1-2) rig configuration: the buried depth of coal mine gob is generally larger, and complex formation, therefore the general choosing of boring
With revolution or the down-the-hole drill that power 11KW is above, moment of torsion is not less than 1110N.m.
1-3) drilling tool configuration: for the different rocks of overburden of the goaf (loam layer, boulder bed, rock section etc.)
Property feature, should configure respectively alloy bit, diamond thin-wall drill bit, full section alloy or diamond bit some; Drilling rod need to be selected the different sizes such as φ 42mm, φ 50mm by reality boring, adopts lock Threaded Connector Coupling.
1-4) grouting equipment configuration: goaf grouting amount is large and the continuous grouting time is generally longer.Therefore, requirement
The low-grade theoretical displacement of grout pump is not less than 80L/min and possesses multistep speed regulation function, and in practice of construction, multiselect uses BW250/50 type grout pump as main force's type.
1-5) pulp feeding system processed: because goaf is larger for slurry demand, pulping equipment adopts band automatic control system
The unified system of large-scale ground mixing plant join, by terminal, be delivered to each operation side; Consider the poor fluidity of high fly ash cement grout, the feature of very fast, the easy plugging of precipitation, slurry water gray scale (weight ratio) generally should not be richer than 0.6:1.
2) in the process range of goaf, arrange filling grout hole, measure the setting-out drilling hole position in goaf.
3) covering layer in goaf and rock section are holed, step is as follows:
3-1) drilling construction order: the perimeter hole in territory, subdrilling goaf to be processed, then to middle part, advance gradually,
On order hole, minute two orders are carried out simultaneously, subdrilling I order hole, then bore II order hole;
3-2) boring location: drilling hole position, according to design cloth hole principle, adopts total powerstation or GPS, is combined with steel
Chi setting-out;
3-3) drilling hole array pitch: according to industrial experimentation situation, detect slurries range of scatter, determine filling grouting brill
The excellent hole of Kongzui array pitch, generally selects 18~22m, and largest hole is apart from being no more than 30m.
3-4) boring hole depth: reach the requirement of design hole depth, specifically to occur significantly falling to bore after phenomenon in boring procedure,
Continue to creep into passing seat earth 1~1.5m, to guarantee that being subject to fill with section fully discloses.
3-5) boring aperture: it is differential that perforate aperture should be greater than two, aperture, whole hole, often adopts φ 110~130mm, bores
To going deep into after basement rock 5m, reducing is that φ 76~91mm continues to creep into, until reach whole hole depth.
3-6) boring hole deviation: because array pitch between filling grout hole is generally larger, and boring to drill goaf, be as the criterion,
Boring deviation controlling is less demanding, but should be before boring perforate or rear strict correction rig vertical shaft angle in place again, guarantees the verticality requirement of boring.
3-7) protection casing is buried underground: boring perforate, to going deep into after basement rock 5m, is imbedded the retaining wall cover of φ 108~127mm
Manage (can double as grout pipe), quantitatively inject the straight cement slurries build-in pin of 0.5:1, anchorage length must not surpass this basement rock segment length.For accelerating the drilling construction progress of grout compartment, can add the accelerating admixture of cement weight 1%~3%, accelerate solidifying of sleeve pipe build-in cement grout.
3-8) drilling method: goaf boring generally (comprises through loam layer, boulder bed, rock section from top to bottom
Curved bel, fissure zone, caving zone), for different stratum characteristics, drilling method can adopt following several mode to carry out:
1. loam layer creeps into employing alloy bit, as three pages of brills, usings bentonite slurry as circulation fluid retaining wall, in low
Rotating speed creeps into;
2. boulder bed creeps into employing diamond thin-wall drill bit, usings bentonite slurry as circulation fluid retaining wall, and the slow-speed of revolution is bored
Enter;
3. general full section drill bit, long drill pipe, the high speed of adopting of rock section crept into, and adopts clear water as circulation fluid,
Need not carry and drill through core midway, reduce and added drilling rod number of times in drilling process, can greatly improve drilling efficiency; While meeting the higher quartz sandstone stratum of intensity, should carry boring and use diamond thin-wall drill bit instead and creep into.
4) boring in goaf is rinsed:
The boring mud of loam layer, boulder bed, outside the suspension effect band by bentonite slurry portals, enters mud overfall pond
Middle precipitation is discharged; Rock section adopts full section drill bit to creep into, and can strengthen the flow of clear water flushing liquor in boring procedure, and rock dust is gone out outside hole; Hole behind whole hole, do not carry and bore to continue to rinse and to be no less than 10min with pressure clear water, the charges in rock fracture, space are taken away, so that slurries range of scatter increasing during slip casting.
5) grouting before grouting is blocked:
Grouting obstruction mode can adopt " aperture sealing method " and " like flange method " two kinds:
5-1), before grouting, mechanical type disabler is blocked in protection casing, or adopts orifice closure and retaining wall cover
Pipe directly connects.Adopt this obstruction mode, simple and easy to do, but the rear sleeve that is in the milk has for a long time been difficult for pulling out.
5-2), after boring finishes, rise and to pull out protection casing, by one end with reducing in hand-hole under the Grouting Pipe of flange pallet
Place, the reverse screwed connection of slip casting bottom tube, so that after slip casting finishes, makes the top Grouting Pipe can forward proposition, reuses; Then to quantitatively injecting the dense cement grout that water/binder ratio is 0.5:1 between hole wall and Grouting Pipe, by Grouting Pipe and hole wall build-in, build-in height is also no more than the basement rock length of this section.
6) by boring, grouting treatment is carried out in inside, goaf:
6-1) total sequence of construction:
Grout hole is by the incline direction in goaf, grout hole and the structure of the gob floor absolute altitude lower position of first constructing
The grout hole at position, more along inclined direction from low to high, by limit portion, to center deployment, constructed.On order hole, minute two orders are carried out simultaneously, first fill with I order hole, then fill with II order hole, to form the filling grouting effect of " enclose, squeeze, press ".
6-2) grouting agent:
It is the Cement fly ash (cement: powder of the high fly ash of 0.8:1 or 1:1 that filling grouting adopts water-solid ratio
Coal ash=0.15:0.85).Wherein cement adopts P.O42.5 level Portland cement, and flyash adopts II level flyash.General more than 0.60.
6-3) grouting line arrangement:
Overfall pipeline should not be arranged on grout pump exit, should lengthen pipeline to aperture overfall, while preventing from pouring into for a long time,
Stop up inlet pipe road, cause unnecessary trouble; Meanwhile, a flap valve should be installed before the return pipe of aperture, to be controlled at the grouting starting stage during passive state, to prevent slurry reflux and stop up overfall pipeline.
6-4) grouting method
Filling grouting adopts " pure pressure type, continuous grouting method ", when grouting amount is large or crack, goaf, space are larger,
In aperture, add funnelform sand slinging machine, with slurries by sand or slag band hand-hole.
6-5) grouting segment length: grouting segment length be after reducing to that segment length in whole hole, go deep into after basement rock 5m to holing
That segment length in whole hole.
6-6) grouting pressure is controlled: grouting flow and the grouting pressure of filling grouting are negative correlativing relation, are in the milk
In journey, gravity flow (pressure is 0MPa) state perfusion is take in grouting substantially, and last 5~30min is in the milk flow rapid drawdown to 10L/min, and grouting pressure rises to 1.0~1.5MPa from 0MPa.
Therefore, grouting pressure is controlled and should be sent special messenger to monitor, and when pressure surpasses 0.3MPa, reminds constructor
Immediately flap valve is opened, prevented the generation of booster phenomenon.On the other hand, in the perfusion state with no pressure of last stage, for avoiding slurries by overfall pipeline blockage, in filling process, should close flap valve.
6-7) grouting ending standard: the ending phase of considering to be in the milk is lasted shorter, strict ending standard and is not difficult to reach
Arrive.Therefore, can adopt when the force value (1.0MPa) of aperture pressure in regulation, pump amount is less than 10L/min, stablizes 10~15min, can finish the filling grouting construction in this hole.
6-8) grouting record: to adopt grouting automatic recording instrument to be recorded as master, consider that filling grouting lasts longer, at the construction field (site) under complicated rugged environment condition, recorder long-play, inevitably can there is signal interruption, print out the faults such as imperfect, now, should adopt immediately hand-kept filling process.
7) grouting quality inspection:
7-1) test mode: carry out the inspection of filling grouting quality after corresponding units engineering mortar depositing construction finishes 7 days, test mode be take geology CT boring scanning and mud jacking inspection as main, in conjunction with boring and coring and grouting data Analysis on Results, be auxiliary simultaneously, comprehensively judge grouting effect.
7-2) inspection eye is arranged: every 40~50 holes are divided into a unit, and each unit arranges two inspection eyes, and adjacent two pitchs of holes should be controlled within the scope of the accuracy of detection of CT scanner, are generally 25~30m;
7-3) mud jacking inspection: adopt the Cement fly ash continuous grouting of water-solid ratio 0.8:1 or 1:1, ending standard is with the filling requirement of being in the milk.After mud jacking finishes, with inspection eye single hole, inject dry ash consumption and carry out two class comparisons, the one, be less than 25% of this cell-average single hole dry ash consumption, think that slip casting effect is better, the 2nd, with inspection eye single hole dry ash consumption, control (according to grouting data, determining), if be less than this value, think that slip casting effect is better, inspection eye mud jacking meets above-mentioned any one standard, thinks that element project grouting quality is qualified.
7-4) consider that coal mine gob Overburden Rock Failure form is generally " trizonal ", filling grouting treatment scope is mainly adopts empty part, caving zone and fault zone.Therefore, inspection eye is got core and only the goaf section of the above 50m scope of whole hole depth is got to core, and core recovery is not less than the regulation of technical requirement on design.
7-5) for the underproof unit of quality examination, according to geology CT scan, mud jacking inspection, grouting effect Information integration, analyze, by managing or designing unit determines whether to need supplementary irrigation or supplement to check.
8) special circumstances are processed:
8-1) boring bit freezing, bury drills phenomenon
Coal measure strata be take soft mud stone as main, and sandstone mostly is argillaceous agglutination, adopts the construction method of full-face drilling, has a large amount of rock dust and produces, and " bury drills " phenomenon very easily occurs; " three bands " distributes obviously, and cranny development, falls piece phenomenon and happen occasionally, and the bit freezing phenomenon frequency also can be higher.
While there is this situation, focus on obviate: the one, adopt the larger slewing drilling machine of moment of torsion, can effectively avoid the generation of bit freezing, bury drills phenomenon; The 2nd, in drilling process, strengthen flushing fluid and flushing pressure, in time rock dust is gone out outside hole; The 3rd, it is differential that the caliber of protection casing should be greater than two, aperture, whole hole, while being convenient to occur drilling accident, extracts processing.
8-2) earth's surface grout phenomenon
Open while filling with, occur earth's surface grout phenomenon, wash boring, guarantees that perfusion channel is unimpeded immediately, then re-starts grouting and processes; Longer for infusion time, or the earth's surface grout phenomenon of boost phase appearance, the perfusion of step-down immediately, takes " earth bag or sandbag ballast " grouting measure along spillage point; When ballast grouting is still invalid, after spillage is pointed out underflow, treat to be solidifyingly no less than 8h, then cleaning bottom of hole is filled with again.
8-3) string hole phenomenon
In goaf grouting process, when pour in a hole, close on around sometimes hole, even every a hole, there is " grout leaking " phenomenon in hole.While there is this phenomenon, wait being ganged up hole, go out after underflow, take two holes or porous to pour into simultaneously.
8-4) midge phenomenon not
In the filling process of goaf, part gets into the reserved coal column in colliery, does not connect with coal mine gob; Part gets into the position that subsides, coal mine gob, and the situation of subsiding is more serious, poor with the connectivity of adjacent regions, has occurred that indivedual holes do not eat the phenomenon of slurry.For this phenomenon, can take grouting pressure suitably to strengthen, the plane of weakness at the position that subsides is punctured and strengthen concrete castability; While can not pressure puncturing, need to pay close attention to the perfusion situation of perimeter hole, take appropriate measures and guarantee the grouting continuity of perimeter hole, to increase its range of scatter.

Claims (4)

1. a construction method for filling grouting is processed in goaf, it is characterized in that the method comprises the following steps:
1) preparation of construction before boring;
2) in the process range of goaf, arrange filling grout hole, measure the setting-out drilling hole position in goaf;
3) covering layer in goaf and rock section are holed;
4) boring in goaf is rinsed;
5) by boring, grouting treatment is carried out in inside, goaf: it is the Cement fly ash of the high fly ash of 0.8:1 or 1:1, wherein cement that grouting adopts water-solid ratio: the weight ratio of flyash is 0.15:0.85;
6) grouting quality inspection.
2. the construction method of filling grouting is processed in a kind of goaf according to claim 1, it is characterized in that: in step 3), different lithology feature for coal mined-out area overlying strata, adopt respectively alloy bit, diamond thin-wall drill bit, full section alloy or diamond bit, and adopt bentonite slurry as circulation fluid retaining wall.
3. the construction method of filling grouting is processed in a kind of goaf according to claim 1 and 2, it is characterized in that: in step 5), adopt ground slurry preparing station system to join Cement fly ash, adopt pressure grout method to be in the milk.
4. the construction method of filling grouting is processed in a kind of goaf according to claim 1 and 2, it is characterized in that: the grouting obstruction mode before grouting is used " aperture sealing method " and " like flange method ".
CN201310537073.XA 2013-11-04 2013-11-04 The construction method of filling grouting is processed in a kind of goaf Active CN103628912B (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104762950A (en) * 2015-04-07 2015-07-08 山西交科岩土工程有限公司 Road mined-out area treatment method
CN104847404A (en) * 2015-03-24 2015-08-19 中交一航局第四工程有限公司 Construction technology of gob grouting method
CN105089043A (en) * 2015-07-24 2015-11-25 北京科技大学 Spatial isolation type runway pavement underlying goaf treatment method
CN106320982A (en) * 2016-08-18 2017-01-11 山东新巨龙能源有限责任公司 Downhole neogene formation exploration hole construction technique
CN106761543A (en) * 2016-12-02 2017-05-31 淮北矿业股份有限公司 A kind of method that section is missed by goaf that drills
CN105019940B (en) * 2015-07-24 2018-04-10 金川集团股份有限公司 A kind of method that damaged filling borehole reparation utilizes
CN110672062A (en) * 2019-08-23 2020-01-10 广州市地质调查院(广州市地质环境监测中心) Embedding method of monitoring points for monitoring settlement of bedrock
CN111561262A (en) * 2020-05-29 2020-08-21 贵州建工集团第一建筑工程有限责任公司 Hole forming method of rotary drilling rig for large-size pile hole in karst area

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CN110439463A (en) * 2019-07-31 2019-11-12 江河水利水电咨询中心 Mined-out Area control injected hole pore-creating technique

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CN102330567A (en) * 2011-08-19 2012-01-25 山西省交通规划勘察设计院 Goaf slip casting treatment method of road
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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104847404A (en) * 2015-03-24 2015-08-19 中交一航局第四工程有限公司 Construction technology of gob grouting method
CN104762950A (en) * 2015-04-07 2015-07-08 山西交科岩土工程有限公司 Road mined-out area treatment method
CN104762950B (en) * 2015-04-07 2016-04-27 山西交科岩土工程有限公司 Highway goaf harnessing method
CN105089043A (en) * 2015-07-24 2015-11-25 北京科技大学 Spatial isolation type runway pavement underlying goaf treatment method
CN105089043B (en) * 2015-07-24 2017-03-22 北京科技大学 Spatial isolation type runway pavement underlying goaf treatment method
CN105019940B (en) * 2015-07-24 2018-04-10 金川集团股份有限公司 A kind of method that damaged filling borehole reparation utilizes
CN106320982A (en) * 2016-08-18 2017-01-11 山东新巨龙能源有限责任公司 Downhole neogene formation exploration hole construction technique
CN106320982B (en) * 2016-08-18 2018-12-18 山东新巨龙能源有限责任公司 Detect hole construction technology in a kind of underground Neogene System stratum
CN106761543A (en) * 2016-12-02 2017-05-31 淮北矿业股份有限公司 A kind of method that section is missed by goaf that drills
CN106761543B (en) * 2016-12-02 2019-07-19 淮北矿业股份有限公司 A method of drilling misses section by goaf
CN110672062A (en) * 2019-08-23 2020-01-10 广州市地质调查院(广州市地质环境监测中心) Embedding method of monitoring points for monitoring settlement of bedrock
CN111561262A (en) * 2020-05-29 2020-08-21 贵州建工集团第一建筑工程有限责任公司 Hole forming method of rotary drilling rig for large-size pile hole in karst area

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