CN104500099B - The administering method of distension at the bottom of the gallery of a kind of colliery - Google Patents
The administering method of distension at the bottom of the gallery of a kind of colliery Download PDFInfo
- Publication number
- CN104500099B CN104500099B CN201410692274.1A CN201410692274A CN104500099B CN 104500099 B CN104500099 B CN 104500099B CN 201410692274 A CN201410692274 A CN 201410692274A CN 104500099 B CN104500099 B CN 104500099B
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- CN
- China
- Prior art keywords
- hole
- distension
- gallery
- gully
- colliery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
Abstract
The invention provides the administering method of distension at the bottom of the gallery of a kind of colliery, comprise the following steps: (a) water blockoff: arrange several injected holes in the floor strata at entry two ends, the degree of depth of described injected hole is 4.5m～6m；Then with grouting pump, injected hole is implemented slip casting, be 5～15 minutes to each injected hole slip casting time；B () is drawn water: after water blockoff completes, and arranges gully-hole in the floor strata in the middle part of entry；After described gully-hole sets, implement to draw water by several times to floor strata by gully-hole, till the bottom of gully-hole is without ponding；(c) filling and injecting slurry: in the floor strata of entry, some filling and injecting slurry holes are set along tunnel axis direction；After described filling and injecting slurry hole sets, disposing Grouting Pipe, then with grouting pump, injected hole is carried out slip casting, grouting pressure is 2～3MPa, and the slip casting time is till the grout of adjacent filling and injecting slurry hole.The present invention can effectively administer distension at the bottom of gallery, and technique is simple, low cost.
Description
Technical field
The present invention relates to the improvement of distension at the bottom of Soft Rock Drifts At Coal, particularly relate to the improvement of distension at the bottom of the gallery of a kind of colliery
Method.
Background technology
For a long time, end distension is big a chronic disease, the most referred to as chronic disease of Soft Rock Drifts At Coal, is because people
Always to its feel simply helpless, only after it is heaved to a certain extent, it is dug out with pneumatic pick, this measure claims
For planted agent.On the one hand end distension causes track torsional deformation, height to rise and fall, and causes overturn accident, causes tunnel to be stopped
Only operation；On the other hand, while end distension occurs, cause two to help interior shifting, country rock monocoque structure carrying energy
Power is greatly reduced, and surrouding rock deformation is serious.Though planted agent can alleviate a period of time need, but act as a planted agent engineering not only workload
Very big, and engineering difficulty is the biggest, and often engineering progress is slow, has a strong impact on production.
The reason of end distension generally has two, and first ground is pressed, and ground pressure is the biggest, and the concentrated stress value of roadway surrounding rock is the biggest,
The extrinsic motive of roadway deformation is the biggest.Second reason is " water ", (logical in the downward certain limit of gallery base plate
In the range of normal 500～4500mm) usually contain substantial amounts of " free water ", the existence of water causes base plate bottom one
Rock in the range of Ding is soaked in water throughout the year.The tunnel of end distension occurs, and its country rock is typically mud stone, mud stone
One of maximum characteristic is exactly inundated intenerating, and major part mud stone is when long-term immersion, and its intensity level is minimum
About the 10% of intensity level can be reduced under its drying regime.This is a fearful numerical value, and intensity reduces and causes
Direct result be that the continuation of base plate relaxation zone expands, the expansion of relaxation zone makes the scope by water soaking bigger,
On the one hand the creep aggravation of country rock particle in relaxation zone is caused, on the other hand as relaxation zone external country rock body
Radial forces reduce and cause the creep power of peripheral rock mass to be strengthened.The expansion of base plate relaxation zone and rock matter
The direct result of the enhancing of some creep ability causes floor rock particle to move to roadway direction exactly, forms the end
Distension.
Summary of the invention
For above-mentioned technical problem, it is an object of the invention to provide a kind of technique simple, low cost and can be effective
Administer the administering method of distension at the bottom of the gallery of colliery.
What the present invention used technical scheme is:
The administering method of distension at the bottom of the gallery of a kind of colliery, comprises the following steps:
(a) water blockoff: first several injected holes are set in the floor strata at the two ends of entry, described
The degree of depth of injected hole is 4.5m～6m；Then with injection slurry, described injected hole is implemented slip casting, grouting sequence:
First both sides middle, rear, first inside, rear outside, to slip casting time of each described injected hole for reaching slip casting pressure
Keep 5～15 minutes after power；
B () is drawn water: the end after water blockoff completes 24 hours in step (a), in the middle part of described entry
Slate layer is arranged gully-hole；After described gully-hole sets, implement to divide to floor strata by described gully-hole
Secondary draw water, till the bottom of described gully-hole is without ponding；
(c) filling and injecting slurry: the axis direction along tunnel arranges some in the floor strata of described entry
Individual filling and injecting slurry hole, described filling and injecting slurry hole is equally spaced the horizontal center line at described entry base plate
On；After described filling and injecting slurry hole sets, then Grouting Pipe is placed, then start to be noted by slurries with grouting pump
Enter described filling and injecting slurry hole, grouting sequence: from one end of described entry to the other end hole-specifically slip casting, slip casting
Pressure is 2～3MPa, and the slip casting time is till the grout of adjacent described filling and injecting slurry hole.
The administering method of distension at the bottom of the gallery of colliery of the present invention, wherein, at entry two in step (a)
The floor strata of end is respectively provided with injected hole described in two rows, often arranges the hole count of described injected hole for more than or equal to 2
Less than or equal to 5, often arrange adjacent described injected hole and be equally spaced along baseplate width.
The administering method of distension at the bottom of the gallery of colliery of the present invention, wherein, to each described note in step (a)
The slip casting time in slurry hole, grouting pressure was 2～3MPa in order to keep 5～15 minutes after reaching grouting pressure.
The administering method of distension at the bottom of the gallery of colliery of the present invention, wherein, described in step (a), injection slurry is
The ratio of mud is the cement mortar of 0.7.
The administering method of distension at the bottom of the gallery of colliery of the present invention, wherein, by catchmenting described in step (b)
Floor strata is implemented to draw water by several times by hole (2), and interval time of every time drawing water is 1 hour, until stopping pumping
Till after 1 hour, the bottom of described gully-hole (2) is without ponding.
The administering method of distension at the bottom of the gallery of colliery of the present invention, wherein, gully-hole described in step (b)
Hole depth 7m, a diameter of 100～120mm.
The administering method of distension at the bottom of the gallery of colliery of the present invention, wherein, at described gully-hole in step (b)
The top 3m scope of interior gully-hole installs steel bushing retaining wall.
The administering method of distension at the bottom of the gallery of colliery of the present invention, wherein, adjacent described filling in step (c)
The spacing of injected hole is 10～20m.
The administering method of distension at the bottom of the gallery of colliery of the present invention, wherein, filling and injecting slurry described in step (c)
The sealed borehole length in hole is 1～1.5m.
The administering method of distension at the bottom of the gallery of colliery of the present invention, wherein, in step (c), slurries select water ash
Ratio is the cement mortar of 0.7, wherein waterglass content 1.0～1.5%, and described waterglass is 45Be ' liquid soluble glass,
Modulus of water glass 2.0.
The method have the benefit that
The administering method of distension at the bottom of the gallery of colliery of the present invention, after its beneficial effect shows slurry filling, can
So that the space in gallery floor strata, fracture filling is closely knit, it is possible to prevent ponding again, such floor rock
After departing from the immersion of water, rock strength is greatly enhanced, additionally can be by rock weight that is broken or that split
The most cementing, thus further improve the integrated carrying ability of floor rock, administering method of the present invention can
Effectively administer distension at the bottom of gallery, and technique is simple, low cost.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the administering method of distension at the bottom of the gallery of colliery of the present invention.
Below in conjunction with specific embodiments and the drawings, the invention will be further described.
Detailed description of the invention
Embodiment 1
As it is shown in figure 1, the administering method of distension at the bottom of the gallery of a kind of colliery, comprise the following steps:
(a) water blockoff: first in the floor strata at the two ends of the entry 4 that a segment length is 100～150m
Being respectively provided with two row's injected holes 1, wherein row's injected hole 1 hole count is 3, other row's injected hole 1 hole count
Be 2, often arrange adjacent injected hole 1 and be equally spaced along baseplate width, the degree of depth of injected hole 1 be 4.5m～
6m；Then injected hole 1 is implemented slip casting, and the slip casting time of each injected hole 1 is for protecting after reaching grouting pressure
Hold 10 minutes, grouting sequence: first both sides middle, rear, first inside, rear outside, grouting pressure is 2～3MPa,
Grouting serous fluid cement mortar, the ratio of mud is 0.7；
B () is drawn water: after in step (a), water blockoff operation completes 24 hours, at the middle part of entry 4
Floor strata in arrange gully-hole 2, hole depth 7m of gully-hole 2, a diameter of 110mm, at gully-hole 2
The top 3m scope of interior gully-hole 2 installs steel bushing retaining wall, it is therefore intended that prevent collapse hole；Gully-hole 2 is arranged
After Hao, implementing to draw water by several times, draw water every time to anhydrous taking out, interval time of every time drawing water is 1 hour,
Till after stopping pumping 1 hour, the bottom of gully-hole 2 is without ponding, time of pumping is between 12h～24h；
(c) filling and injecting slurry: the axis direction along tunnel arranges some filling in the floor strata of entry 4
Filling out injected hole 3, filling and injecting slurry hole 3 is equally spaced on the horizontal center line of the roadway floor of entry 4,
The spacing in adjacent filling and injecting slurry hole 3 is 10m, different according to base plate lithology, when floor rock clay content is less,
Spacing is desirable larger；When clay content is more, spacing is desirable less；After filling and injecting slurry hole 3 sets, will note
Slurry is after pipe places, and then starts, with grouting pump, slurries inject filling and injecting slurry hole 3, grouting sequence: from level
The one end in tunnel 4 is to the other end hole-specifically slip casting, and grouting pressure is 3MPa, and sealed borehole length is 1.5m, during slip casting
Between till the grout of adjacent filling and injecting slurry hole 3, slurries select the ratio of mud be the cement mortar of 0.7, wherein waterglass
Content 1.0～1.5%, described waterglass is 45Be ' liquid soluble glass, and modulus of water glass 2.0, waterglass can
Play waterproof effect.
Embodiment 2
Difference with embodiment 1 is: described in step (a) in water blockoff, during the slip casting of each injected hole 1
Between for reaching to keep 5 minutes after grouting pressure；Hole depth 7m of gully-hole 2 in step (b), a diameter of 100mm；
In step (c), the spacing in adjacent filling and injecting slurry hole 3 is 20m, and grouting pressure is 2MPa, and sealed borehole length is
1.5m。
Embodiment 3
Difference with embodiment 1 is: described in step (a) in water blockoff, during the slip casting of each injected hole 1
Between for reaching to keep 15 minutes after grouting pressure；Hole depth 7m of gully-hole 2 in step (b), a diameter of 120mm.
So-called water blockoff is exactly to arrange injected hole at the two ends that a segment length is L entry and implement the slip casting (length of L
Spend and allow situation to determine depending on produced on-site, the most desirable 100～150m), it is therefore intended that block this section of horizontal lane
Be connected with the both sides water conservancy in tunnel of road contacts.Use the administering method of distension at the bottom of the gallery of colliery of the present invention, first
First carry out water blockoff, it is therefore intended that block be connected with the both sides water conservancy in tunnel of this section of tunnel and contact, after slip casting, this section
Water conservancy relation between entry with adjacent tunnel is cut off, and then draws water, the floor strata after drawing water
In the space that was originally occupied by the water by vacant out, when implementing grout pouring, cement mortar easily enters this
The most vacant space out so that slip casting efficiency and grouting quality are improved.When in floor strata, water is exhausted
After, finally carrying out filling and injecting slurry, filling and injecting slurry on the one hand can be fully by the space in floor strata, crack
Filling is closely knit, prevents ponding again, and after floor rock departs from the immersion of water, rock strength can be greatly improved；Separately
On the one hand the integrated carrying ability of floor rock can be improved by the most cementing for rock that is broken or that split.
Embodiment described above is only to be described the preferred embodiment of the present invention, not to the present invention
Scope be defined, on the premise of designing spirit without departing from the present invention, those of ordinary skill in the art to this
The various deformation made of technical scheme of invention and improvement, all should fall into the protection that claims of the present invention determines
In the range of.
Claims (10)
1. the administering method of distension at the bottom of a colliery gallery, it is characterised in that: comprise the following steps:
(a) water blockoff: several injected holes (1) are first set in the floor strata at the two ends of entry (4),
The degree of depth of described injected hole (1) is 4.5m～6m；Then with injection slurry, described injected hole (1) is implemented note
Slurry, grouting sequence: first both sides middle, rear, first inside, rear outside, to each described injected hole (1)
The slip casting time is for keeping 5～15 minutes after reaching grouting pressure；
B () is drawn water: after in step (a), water blockoff completes 24 hours, at described entry (4) middle part
Floor strata in arrange gully-hole (2)；After described gully-hole (2) sets, right by gully-hole (2)
Floor strata is implemented to draw water by several times, till the bottom of described gully-hole (2) is without ponding；
(c) filling and injecting slurry: the axis direction along tunnel is arranged in the floor strata of described entry (4)
Several filling and injecting slurry holes (3), described filling and injecting slurry hole (3) is equally spaced in described entry (4)
On the horizontal center line of base plate；After described filling and injecting slurry hole (3) sets, dispose Grouting Pipe, then start
With grouting pump, slurries are injected described filling and injecting slurry hole (3), grouting sequence: from described entry (4)
One end is to the other end hole-specifically slip casting, and grouting pressure is 2～3MPa, and the slip casting time is with adjacent described filling and injecting slurry
Till hole (3) grout.
The administering method of distension at the bottom of the gallery of colliery the most according to claim 1, it is characterised in that: in step (a)
In the floor strata at entry (4) two ends, it is respectively provided with injected hole (1) described in two rows, often arranges described note
The hole count in slurry hole is less than or equal to 5 more than or equal to 2, often arranges adjacent described injected hole (1) along baseplate width
It is equally spaced.
The administering method of distension at the bottom of the gallery of colliery the most according to claim 1, it is characterised in that: in step (a)
To slip casting time of each described injected hole (1) for keeping 5～15 minutes after reaching grouting pressure, slip casting pressure
Power is 2～3MPa.
The administering method of distension at the bottom of the gallery of colliery the most according to claim 1, it is characterised in that: in step (a)
Described injection slurry be the ratio of mud be the cement mortar of 0.7.
The administering method of distension at the bottom of the gallery of colliery the most according to claim 1, it is characterised in that: in step (b)
Described enforcement floor strata by gully-hole (2) is drawn water by several times, and interval time of every time drawing water is 1 hour,
Till after stopping pumping 1 hour, the bottom of described gully-hole (2) is without ponding.
The administering method of distension at the bottom of the gallery of colliery the most according to claim 1, it is characterised in that: in step (b)
Hole depth 7m of described gully-hole (2), a diameter of 100～120mm.
The administering method of distension at the bottom of the gallery of colliery the most according to claim 6, it is characterised in that: in step (b)
In described gully-hole (2), the top 3m scope of gully-hole (2) installs steel bushing retaining wall.
The administering method of distension at the bottom of the gallery of colliery the most according to claim 1, it is characterised in that: in step (c)
The spacing of adjacent described filling and injecting slurry hole (3) is 10～20m.
The administering method of distension at the bottom of the gallery of colliery the most according to claim 1, it is characterised in that: in step (c)
The sealed borehole length of described filling and injecting slurry hole (3) is 1～1.5m.
10. according to the administering method of distension at the bottom of the colliery gallery described in claim 1-9 any one, it is characterised in that:
In step (c), slurries select the ratio of mud to be the cement mortar of 0.7, and wherein waterglass content 1.0～1.5%, described
Waterglass is 45Be ' liquid soluble glass, modulus of water glass 2.0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410692274.1A CN104500099B (en) | 2014-11-25 | 2014-11-25 | The administering method of distension at the bottom of the gallery of a kind of colliery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410692274.1A CN104500099B (en) | 2014-11-25 | 2014-11-25 | The administering method of distension at the bottom of the gallery of a kind of colliery |
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| Publication Number | Publication Date |
|---|---|
| CN104500099A CN104500099A (en) | 2015-04-08 |
| CN104500099B true CN104500099B (en) | 2016-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410692274.1A Expired - Fee Related CN104500099B (en) | 2014-11-25 | 2014-11-25 | The administering method of distension at the bottom of the gallery of a kind of colliery |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1293354A1 (en) * | 1985-10-30 | 1987-02-28 | Карагандинский политехнический институт | Method of preventing bulging of soil species |
| SU1717833A1 (en) * | 1990-02-26 | 1992-03-07 | Днепропетровский горный институт им.Артема | Method of maintaining workings with heaving floors |
| CN1840856A (en) * | 2005-03-30 | 2006-10-04 | 中国矿业大学 | Bottom plate concealed type reverse-arc grouting construction method |
| CN101886545A (en) * | 2010-07-05 | 2010-11-17 | 北京科技大学 | Method for treating bottom heave of soft rock roadway by using micro broken stone pipe cast pile |
| CN102797478A (en) * | 2012-08-27 | 2012-11-28 | 中国矿业大学 | Method for preventing bottom squeeze of soft rock roadway by using distributed shear-resistant slip-resistant reinforced concrete pile |
| CN103206224A (en) * | 2013-04-26 | 2013-07-17 | 山东科技大学 | Strong resistance and strong evasion floor heave governing construction method of high-stress large-deformation soft rock drift |
| CN103291328A (en) * | 2013-06-29 | 2013-09-11 | 湖南科技大学 | Swelling rock roadway bottom plate treatment method |
-
2014
- 2014-11-25 CN CN201410692274.1A patent/CN104500099B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1293354A1 (en) * | 1985-10-30 | 1987-02-28 | Карагандинский политехнический институт | Method of preventing bulging of soil species |
| SU1717833A1 (en) * | 1990-02-26 | 1992-03-07 | Днепропетровский горный институт им.Артема | Method of maintaining workings with heaving floors |
| CN1840856A (en) * | 2005-03-30 | 2006-10-04 | 中国矿业大学 | Bottom plate concealed type reverse-arc grouting construction method |
| CN101886545A (en) * | 2010-07-05 | 2010-11-17 | 北京科技大学 | Method for treating bottom heave of soft rock roadway by using micro broken stone pipe cast pile |
| CN102797478A (en) * | 2012-08-27 | 2012-11-28 | 中国矿业大学 | Method for preventing bottom squeeze of soft rock roadway by using distributed shear-resistant slip-resistant reinforced concrete pile |
| CN103206224A (en) * | 2013-04-26 | 2013-07-17 | 山东科技大学 | Strong resistance and strong evasion floor heave governing construction method of high-stress large-deformation soft rock drift |
| CN103291328A (en) * | 2013-06-29 | 2013-09-11 | 湖南科技大学 | Swelling rock roadway bottom plate treatment method |
Non-Patent Citations (3)
| Title |
|---|
| 巷道底鼓的成因及其防治措施;李成才等;《煤炭技术》;20121130;第63-64页 * |
| 微型碎石管注桩治理深部软岩巷道底鼓新方法;谢芳等;《中国安全生产科学技术》;20130228;第5-11页 * |
| 软岩巷道底鼓形成机理与治理;武继森等;《山东煤炭科技》;20051231;第7-8页 * |
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Inventor after: Xue Weipei Inventor after: Jing Wei Inventor after: Jing Laiwang Inventor after: Yao Zhishu Inventor before: Jing Wei Inventor before: Xue Weipei Inventor before: Jing Laiwang |
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Granted publication date: 20160824 Termination date: 20181125 |