CN108661682B - Grouting water plugging method for anchor cable hole of weakly cemented water-rich roof - Google Patents
Grouting water plugging method for anchor cable hole of weakly cemented water-rich roof Download PDFInfo
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- CN108661682B CN108661682B CN201810409903.3A CN201810409903A CN108661682B CN 108661682 B CN108661682 B CN 108661682B CN 201810409903 A CN201810409903 A CN 201810409903A CN 108661682 B CN108661682 B CN 108661682B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000004873 anchoring Methods 0.000 claims abstract description 29
- 239000011435 rock Substances 0.000 claims abstract description 26
- 239000007787 solid Substances 0.000 claims abstract description 24
- 238000005553 drilling Methods 0.000 claims abstract description 22
- 239000002002 slurry Substances 0.000 claims abstract description 13
- 238000005507 spraying Methods 0.000 claims abstract description 11
- 239000004567 concrete Substances 0.000 claims abstract description 9
- 230000000694 effects Effects 0.000 claims abstract description 8
- 239000003245 coal Substances 0.000 claims abstract description 7
- 208000008918 voyeurism Diseases 0.000 claims abstract description 7
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 239000000523 sample Substances 0.000 claims abstract description 4
- 238000002347 injection Methods 0.000 claims abstract description 3
- 239000007924 injection Substances 0.000 claims abstract description 3
- 239000004568 cement Substances 0.000 claims description 7
- 239000011378 shotcrete Substances 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 4
- 235000019353 potassium silicate Nutrition 0.000 claims description 4
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 3
- 239000002360 explosive Substances 0.000 claims 1
- 238000002360 preparation method Methods 0.000 claims 1
- 238000010276 construction Methods 0.000 description 5
- 238000007569 slipcasting Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 244000025254 Cannabis sativa Species 0.000 description 2
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 2
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 235000009120 camo Nutrition 0.000 description 2
- 235000005607 chanvre indien Nutrition 0.000 description 2
- 239000011440 grout Substances 0.000 description 2
- 239000011487 hemp Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/028—Devices or accesories for injecting a grouting liquid in a bore-hole
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Piles And Underground Anchors (AREA)
Abstract
A grouting water plugging method for anchor cable holes of a weakly cemented water-rich roof aims to solve the problem of Kong Linshui support of the anchor cable of the weakly cemented water-rich roof and prevent the anchor cable from rusting; the method of the invention is to insert the peeping instrument probe into the drilled hole, and comprehensively determine the length and the diameter of the solid rope body; immediately spraying concrete to close the roadway after the roadway is excavated, and spraying concrete for the second time after the anchor rod is hung on the net; carrying out anchor cable drilling on the direction perpendicular to the surface of the tunnel roof by using an anchor cable drilling machine; filling the solid rope body into the drilled anchor rope hole, and fully anchoring the solid rope body with the hard surrounding rock through an anchoring cartridge at the end of the anchor rope; the rigid round tube, the slurry-swelling type slurry stop plug, the slurry injection tray and the lockset are sequentially installed, and the orifice is sealed; the tensioning machine is arranged on the exposed section of the solid rope body for tensioning and pre-tightening; grouting is carried out on the anchor rope hole grouting section between the anchoring section and the grouting stop plug, so that water in the roof water-bearing layer is prevented from penetrating into roof coal rock through the anchor rope hole, and the waterproof and water-blocking effects are achieved.
Description
Technical Field
The invention relates to the technical field of surrounding rock support of underground coal mine roadways, in particular to a grouting water plugging method for anchor cable holes of a weakly cemented water-rich roof.
Background
The stabilization of the surrounding rock of the roadway is the result of the combined action of the surrounding rock and the supporting body, and the surrounding rock is an important component of the supporting structure or the supporting structure. The support of the coal mine tunnel is subjected to a long process from a wood shed support, a building support and a section steel support to an anchor rod (rope) support. With the maturity of small aperture anchor rope supporting technology and supporting technology, the application of resin anchor rope supporting in mine tunnel, underground chamber and other underground structures is more and more widespread. The small-aperture anchor cable support adopting the resin anchoring agent has the advantages of simple and convenient construction equipment, high construction speed, good anchoring effect, low labor intensity of workers and the like. Along with the increasing of the excavation depth of the roadway, the situation that surrounding rocks of the roadway are in an aquifer is more and more, and the weakly consolidated water-rich roof roadway has the characteristics that firstly, the roof and the floor of a coal seam are mainly weak consolidated soft rocks such as carbonaceous mudstones, fine sandstones, mudstones, silty mudstones and the like, the soft rocks form unique physical and mechanical properties, are more complete in a natural state, have certain original strength, are easy to disturb, weather, and cement and disintegrate, and most of rocks are mainly cementing and have poor lithology; secondly, the anchor cable holes are sprayed with a large amount of water for a long time, so that the anchor cable and the rod body are easy to corrode and rust, the clamping piece is locked and invalid, the anchor and the tray slide downwards, and serious hidden danger is brought to mine safety; in addition, roof water permeates to roof coal rock through the anchor rope hole, and the roof is easy to soften and disintegrate after meeting water, leads to tunnel support difficulty. The current method for solving the problem mainly comprises grouting and water plugging of the top plate and grouting and anchoring of the anchor cable. Because the roof aquifer is generally wide in distribution range and large in change of water-containing state, the method for grouting the roof is high in cost and poor in effect, and normal roadway tunneling is influenced. The anchor cable is anchored by grouting, the anchor cable body is of a hollow structure, the anchoring strength is low, the construction procedure is complex, and when the water spraying of the anchor cable hole is large, the grouting effect is not easy to control, so that hidden danger is buried for subsequent exploitation safety.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a grouting water plugging method for a weakly cemented water-rich roof anchor cable hole, which can solve the problem of Kong Linshui support of the weakly cemented water-rich roof anchor cable, prevent the anchor cable from rusting and realize the anchoring of the anchor cable with high-strength full-length pretightening force.
The method of the invention is as follows:
(1) Drilling peeping: the peeping instrument probe is inserted into a drilled hole and gradually goes deep, the position of a roof aquifer and the development condition of a crack are determined by probing the damage and the structural condition in the drilled hole, displaying, recording and storing images, and the length and the diameter of a solid cable body are determined after the parameters such as the section size of a roadway, the stress state of surrounding rock, the mechanical property, the anchor cable layout mode and the like are comprehensively considered.
(2) Grouting to seal the surface of the roadway: and immediately after the tunnel is excavated, the tunnel is firstly sealed by spraying concrete for the first time, the thickness of the sprayed concrete is 45-55mm, the second time is sprayed by spraying concrete for the second time after the anchor rod is hung on the net, and the total thickness of the sprayed concrete for the second time is 100mm.
(3) Drilling anchor cable: and constructing anchor cable drilling holes on the tunnel roof by utilizing an MFC-1392/3657 anchor cable drilling machine, wherein the anchor cable drilling holes are perpendicular to the surface of the tunnel roof. And determining drilling parameters according to the length and the diameter of the anchor cable and the specification of the drilling machine.
(4) And (3) anchoring the anchor cable: filling the solid rope body into the drilled anchor rope hole, and fully anchoring the solid rope body with the hard surrounding rock through an anchoring cartridge at the end of the anchor rope; the anchor cable anchoring section (the area where the anchor cartridge anchors the anchor cable and surrounding rock) is arranged at the upper part of the aquifer; the exposed length of the solid rope is 150mm-200mm.
(5) Installing a water blocking structure: a rigid circular tube, a slurry-swelling type slurry stop plug, a slurry injection tray and a lockset are sequentially installed in the anchor cable drilling hole, and the hole opening is sealed.
(6) Stretching the anchor cable: the MQ18-200/63 stretching machine is arranged at the exposed section of the solid rope body, and the solid rope body is stretched and pre-tensioned through the lock.
(7) Grouting: grouting is carried out on the grouting section of the anchor cable hole through the grouting holes of the grouting tray and the rigid round pipe, so that water in the roof water-bearing layer is prevented from penetrating into the roof coal rock through the anchor cable hole, and the waterproof and water-blocking effects are achieved. The grouting section is positioned between the anchoring section and the grout stop. The grouting liquid is prepared by cement paste with the cement paste ratio (mass ratio) of 1-1.1:1 and water glass with the density of 1.50g/cm 3 according to the mass ratio of 1:0.5-0.8, and is suitable for filling holes and solidifying.
The grouting tray adopted by the method is a butterfly tray with grouting holes, and is sleeved on the solid rope body; the anchor cable hole grouting pipeline is a rigid circular pipe and is installed in the anchor cable drilling hole through the grouting hole. The tool to lock is located slip casting tray lower part, and the tool to lock internal surface has the internal thread with solid cable body surface assorted, through the fixed slip casting tray of tool to lock to stretch-draw pretension to the solid cable body. The slurry-expanding type slurry stop plug is a hemp rope or other material plug wound at the orifice position. Grouting is carried out to the grouting section through grouting holes of the grouting tray and the rigid round pipe. The anchor cable anchoring section is arranged at the upper part of the aquifer, and the grouting section is arranged between the anchoring section and the grout stop plug.
The method can solve the problem of the weak cementing water-rich roof anchor cable Kong Linshui which cannot be solved by a general supporting method, provides a weak cementing water-rich roof anchor cable hole grouting water-plugging structure and a grouting water-plugging method, and is suitable for the roadway of weak cementing soft rocks such as carbonaceous mudstones, fine sandstones, mudstones, silty mudstones and the like, wherein the roof is rich in water. The grouting water plugging device can realize grouting water plugging of the anchor cable hole, so that water in the top plate is restored to the original state, thereby preventing the anchor cable from rusting and clamping piece locking failure, realizing high-strength full-length pretightening force anchoring of the anchor cable and having good effect of controlling surrounding rock of the top plate; compared with the roof grouting water shutoff and grouting anchoring anchor cable, the roof grouting water shutoff and grouting anchoring anchor cable has the advantages of simple structure, convenience in processing and lower cost besides high supporting strength and convenience in construction.
Drawings
Fig. 1 is a schematic view of the construction structure of the present invention.
In the figure: 1. solid cable body, 2, anchor rope anchor section, 3, anchor rope slip casting section, 4, rigid pipe, 5, slip casting tray, 6, slip casting hole, 7, tool to lock, 8, meet thick liquid inflation formula and stop the thick liquid stopper, 9, roof aquifer.
Detailed Description
Most of the top bottom plates of the gate way for transporting the Hami Danan lake ore 111801 are weakly cemented rock layers, surrounding rock cementation is poor, strength is low, surrounding rock strength is further weakened under the influence of a roof aquifer, and roadway support is difficult. The roof support problem can be relieved by arranging the drainage holes in the tunnel and concentrating drainage, but the weak consolidated rock stratum can be eroded by roof water penetration, so that the strength of surrounding rock is improved for reducing the weakening effect. 19 strands of steel strand small-aperture prestressed anchor cables with the anchor cable specification of phi 21.6mm multiplied by L6300mm are used, each anchor cable is matched with a disc grouting anchor tray with the specification of 300 multiplied by 16mm, a hemispherical high-strength adjustable core washer and a lockset are used, the row spacing between the anchor cables of a top plate is 1400mm multiplied by 1600mm, and the pre-tightening force applied by the anchor cable is 200KN. The ore is proved by industrial tests: the comprehensive control technology combining reasonable water retention and large water spraying amount of the grouting anchor cable for the tunnel roof and centralized arrangement of the drainage holes at the low position of the drainage tunnel with controlled drainage and high-performance high-reliability anchor rod and anchor cable support has good control effect on surrounding rocks of the tunnel. The method comprises the following specific steps:
(1) Drilling peeping: observing the position of the roof aquifer 9, roof cracks and the like, and ensuring that the anchor rope anchoring section 2 is arranged at the upper part of the roof aquifer 9 when the position of the roof aquifer 9 is close to the top plate of the roadway.
(2) Grouting to seal the surface of the roadway: and (3) immediately hanging a net for supporting an anchor rod after the tunnel is excavated, firstly spraying concrete for the first time to close the tunnel, spraying concrete for the second time after the anchor rod is hung on the net, and spraying concrete for the second time again for 50mm, wherein the total thickness of the sprayed concrete for the second time is 100mm.
(3) Drilling anchor cable: and (3) constructing anchor cable drilling holes on the tunnel roof by using an anchor cable drilling machine, wherein an anchor cable anchoring section is arranged on the upper part of the roof aquifer 9.
(4) And (3) anchoring the anchor cable: and (3) loading the anchor cable into the pre-punched anchor cable hole, fully anchoring, wherein the exposed length of the solid cable body 1 is 200mm.
(5) Installing a water blocking structure: the grouting pipeline 4, the slurry-swelling type slurry stop plug 8, the grouting tray 5 and the lock 7 are sequentially installed, and the orifice is sealed.
(6) Stretching the anchor cable: the solid rope body 1 is tensioned and pre-tightened by a tensioning tool through a lock 7.
Grouting: grouting is carried out on the anchor cable hole through the rigid circular tube 4, the ratio of cement slurry to water glass in the slurry is 1:0.5, and the grouting amount is proper when the hole is filled, namely solidification is carried out.
The grouting tray 5 is a butterfly tray with grouting holes 6, and the grouting tray 5 is sleeved on the solid rope body 1; the rigid circular tube 4 is an anchor cable hole grouting pipeline and is installed in an anchor cable drilling hole through a grouting hole 6. The lock 7 is positioned at the lower part of the grouting tray, the inner surface of the lock 7 is provided with an internal thread matched with the outer surface of the solid rope body 1, the grouting tray 5 is fixed through the lock, and the anchor rope bundle is tensioned and pre-tensioned. The pulp-expanding type pulp stop 8 is a hemp rope or other material plug wound at the orifice position. Grouting is carried out on the grouting section 3 through the grouting holes 6 of the grouting tray 5 and the rigid round pipe 4. The anchor rope anchoring section 2 is arranged at the upper part of the aquifer, and the grouting section 3 is arranged between the anchoring section 2 and the slurry-expanding type slurry stop plug 8.
Claims (6)
1. A grouting water plugging method for anchor cable holes of a weakly cemented water-rich roof is characterized by comprising the following steps:
(1) Drilling peeping: inserting a peeping instrument probe into the drilled hole and gradually penetrating the peeping instrument probe, and determining the position of a roof aquifer and the development condition of a crack by probing the damage and the structure in the drilled hole so as to comprehensively determine the length and the diameter of a required solid rope body;
(2) Grouting to seal the surface of the roadway: immediately spraying concrete to close the roadway after the roadway is excavated, and spraying concrete for the second time after the anchor rod is hung on the net;
(3) Drilling anchor cable: carrying out anchor cable drilling on the direction perpendicular to the surface of the tunnel roof by using an anchor cable drilling machine;
(4) And (3) anchoring the anchor cable: filling the solid rope body into the drilled anchor rope hole, and fully anchoring the solid rope body with the hard surrounding rock through an anchoring cartridge at the end of the anchor rope; the anchor explosive roll anchors the anchor cable and the anchor cable anchoring section of the surrounding rock at the upper part of the aquifer;
(5) Installing a water blocking structure: the rigid round tube, the slurry-swelling type slurry stop plug, the slurry injection tray and the lockset are sequentially installed, and the hole is sealed;
(6) Stretching the anchor cable: installing a tensioning machine on the exposed section of the solid rope body, and tensioning and pre-tightening the solid rope body through a lock;
(7) Grouting: grouting is carried out on an anchor cable hole grouting section positioned between the anchoring section and the grouting stop plug through a grouting hole and a rigid circular tube on the grouting tray, so that water in the roof water-bearing layer is prevented from penetrating into roof coal rock through the anchor cable hole, and the waterproof and water-blocking effects are achieved;
when grouting is carried out on the anchor cable hole grouting section, the slurry is prepared by adding water glass into cement slurry, and the preparation proportion is that the grouting is proper when the hole is filled;
When grouting is carried out on the anchor cable hole grouting section, grouting liquid is prepared by adopting cement paste with the water cement ratio of 1-1.1:1 and water glass with the density of 1.50g/cm <3 > according to the mass ratio of 1:0.5-0.8.
2. The grouting and water plugging method for the anchor cable hole of the weakly consolidated water-rich roof of claim 1, wherein the type and the type of an anchor cable drilling machine adopted in the anchor cable drilling are MFC-1392/3657.
3. The grouting and water plugging method for the anchor cable hole of the weakly consolidated water-rich roof of claim 1, wherein the type of the tensioning machine used for tensioning the anchor cable is MQ18-200/63.
4. The grouting and water plugging method for the anchor cable hole of the weakly consolidated water-rich roof of claim 1, wherein when the grouting seals the surface of a roadway, the thickness of the primary sprayed concrete or the secondary sprayed concrete is 45-55mm, and the total thickness of the two sprayed concrete is 90-110 mm.
5. The grouting and water plugging method for the anchor cable hole of the weakly cemented water-rich roof of claim 1, wherein the exposed length of the solid cable body is 150mm-200mm when the anchor cable is anchored.
6. The grouting and water plugging method for the anchor cable holes of the weakly consolidated water-rich roof of claim 1, wherein the grouting tray is a butterfly tray with grouting holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810409903.3A CN108661682B (en) | 2018-05-02 | 2018-05-02 | Grouting water plugging method for anchor cable hole of weakly cemented water-rich roof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810409903.3A CN108661682B (en) | 2018-05-02 | 2018-05-02 | Grouting water plugging method for anchor cable hole of weakly cemented water-rich roof |
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| CN108661682B true CN108661682B (en) | 2024-05-28 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109252882B (en) * | 2018-11-19 | 2024-03-15 | 河南理工大学 | Three-region cooperative coupling supporting system for broken surrounding rock roadway and construction method of three-region cooperative coupling supporting system |
| CN110821536A (en) * | 2019-11-22 | 2020-02-21 | 内蒙古上海庙矿业有限责任公司 | Method for improving anchoring effect of soft rock roadway floor anchor rod |
| CN111139853B (en) * | 2019-12-24 | 2021-03-30 | 同济大学 | High-flow-rate karst pipeline net hanging, stone hooking and grouting combined water plugging method |
| CN113153396B (en) * | 2021-04-19 | 2023-03-31 | 华北科技学院 | Hole sealing, grouting and water plugging reinforcing method for anchor cable holes in roadway water spraying area |
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| CN208518690U (en) * | 2018-05-02 | 2019-02-19 | 阳泉煤业（集团）有限责任公司 | A kind of weak cementing rich water top plate anchor cable hole grouting for water blocking device |
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2018
- 2018-05-02 CN CN201810409903.3A patent/CN108661682B/en active Active
Patent Citations (7)
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|---|---|---|---|---|
| CN102146673A (en) * | 2011-02-27 | 2011-08-10 | 山东科技大学 | Anchoring structure for liquid-injection corrosion-resistant anchor rod or anchor cable and construction method thereof |
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