CN102505949B - Support method for coal seam roadway to cross gob - Google Patents
Support method for coal seam roadway to cross gob Download PDFInfo
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- CN102505949B CN102505949B CN 201110361794 CN201110361794A CN102505949B CN 102505949 B CN102505949 B CN 102505949B CN 201110361794 CN201110361794 CN 201110361794 CN 201110361794 A CN201110361794 A CN 201110361794A CN 102505949 B CN102505949 B CN 102505949B
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- goaf
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- heading
- ductule
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Abstract
A support method for a coal seam roadway to cross a gob belongs to the technical field of roadway supporting for coal measure strata and utilizes combination of temporary support and permanent support. The support method is characterized in that the temporary support includes applying an alternating-current field after double-slurry is grouted into small ducts, increasing scattering radius of the slurry under electric effect of electro-osmosis and electrophoresis, filling the double-slurry into holes and slits inside regenerated surrounding rock of the gob sufficiently so as to reinforce of the regenerated surrounding rock of the gob again, and finally forming the integrated surrounding rock. The support method aims to increase integral strength, stability and self-bearing capacity of the regenerated surrounding rock of the gob. The integral strength of the regenerated surrounding rock of the gob is increased by at least 230% by using the support method as compared with the existing support method for the coal seam roadway to cross the gob.
Description
Technical field
A kind of heading of the present invention is crossed the supporting method in goaf, the technology category that belongs to coal measure strata roadway support, specifically a kind ofly adding under the AC field effect method of the heading of crossing the goaf being carried out temporary lining and permanent support, purpose is to improve goaf regeneration country rock bulk strength, stability and self-bearing capacity.
Background technology
Along with the day by day increase of national economy to coal demand, coal production rises year by year, and coal mining intensity continues to increase.When coal resource integration, a merging and reorganization mine often is comprised of several small coal mines, these little kilns do not fill owing to only adopting when cutting coal resource, selection of mining is improper, the goaf is processed untimely and destroy the reason such as safety pillar, have stayed a large amount of goafs.The time that little kiln exploitation forms the dead zone is generally more remote, distortion and migration have occured in the goaf overlying rock, institute's spacing is in the state of filling up substantially, but firm substantial unlike protolith, there are large metering-orifice, crack, the local location that is not filled with that also exists, goaf country rock present that soft broken, stability and less robust, stress are concentrated, underground water guide gushing water passage is many and the characteristics such as supporting capacity is weak, and this brings very large difficulty for roadway support of merging and reorganization mine.Therefore, heading is crossed the goaf supporting also just becomes the major issue that the merging and reorganization mine faces.
Little kiln is after primary recovery, destroyed the protolith equipoise, so that the goaf stress of primary rock changes, and for equilibrium establishment redistributes, when reaching critical condition, surrounding rock failure and movement will occur, along with the coal mining scope constantly enlarges, country rock is further destroyed and is moved, and causes Rock Mass Caving, cause the accidents such as weighting over great extent and Surrounding Rock Movement, brought serious potential safety hazard to the colliery safety in production.The essence of goaf supporting is to shift surrouding rock stress to concentrate the position, relaxes stress concentration degree, makes stress reach new relative equilibrium, presses with control and management ground, guarantees Safety of Coal Mine Production.Existing heading supporting method is mainly high strength frame, concrete anti-arch, stone cornering arch, the spray supporting of anchor net and slip casting sealing and reinforcing etc.For the impact on the goaf surrounding rock stability of goaf overlying rock caving zone, slit band and integrally bending band, when, dynamic pressure serious when goaf surrouding rock deformation displacement concentrated, above-mentioned support pattern can not satisfy the surrounding rock stability requirement that heading is crossed the goaf.
Summary of the invention
A kind of heading of the present invention is crossed the supporting method in goaf, purpose is to overcome shortcomings and deficiencies of the prior art, propose heading under a kind of AC field effect and cross the supporting method in goaf, thereby improve goaf regeneration country rock bulk strength, stability and self-bearing capacity.
A kind of heading of the present invention is crossed the supporting method in goaf, it is characterized in that a kind ofly the heading of crossing the goaf being carried out the method that temporary lining and permanent support combine adding under the AC field effect, the method is crossed heading exactly the goaf and is carried out first temporary lining, in the after-applied AC field of ductule two fluid grouting, under the effect of electric osmose and electrophoresis electrokinesis, increase grout spreading range, carry out again permanent support, mode is the spray of anchor net or stone cornering arch, and concrete step is:
I, first the regeneration country rock 1 of the goaf beyond heading 2 outline lines being carried out temporary lining, is that 10 °～30 ° and circumferential distance are that 600～1200mm squeezes into ductule 3 in advance according to outer limb, and ductule length is 1600～2600mm;
II, build the AC field filling system, the critical piece of this system comprises goaf regeneration country rock 1, heading 2, ductule 3, biliquid slurry 4 and AC field 5;
III, at the interior injection biliquids slurry 4 of ductule 3, add AC field 5, voltage is 660～1140V, adulterant is acidic electrolyte bath Na
2SiO
3, Na
2SO
4, NaCl, Na
3PO
4, concentration is 0～410gl
-1
IV, when grout spreading range during greater than 2m, stop the AC field effect, again goaf regeneration country rock 1 is carried out permanent support, mode is the spray of anchor net or stone cornering arch.
The supporting method that heading is crossed the goaf under a kind of AC field effect of the present invention is compared with existing heading supporting method, has following outstanding substantive distinguishing features and significant effect:
1, heading is crossed the supporting method in goaf under a kind of AC field effect of the present invention, it is the supporting method that a kind of temporary lining and permanent support combine, it is characterized in that temporary lining is in the after-applied AC field of ductule two fluid grouting, under the effect of the electrokinesises such as electric osmose and electrophoresis, increase grout spreading range, so that biliquid is starched hole, the crack of abundant bashing regeneration country rock inside, goaf regeneration country rock is reinforced again, make it form the supporting method of whole country rock;
2, heading is crossed the supporting method in goaf under a kind of AC field effect of the present invention, and under the AC field effect, grout spreading range is greater than 2m behind the two fluid grouting, and goaf regeneration country rock bulk strength improves more than 230%;
3, heading is crossed the supporting method in goaf under a kind of AC field effect of the present invention, is widely used in the aspects such as shaft construction in the coal mine mining operation, development work construction, preparatory working construction, Chamber Construction.
Description of drawings
Fig. 1 is that heading is crossed the AC field arrangement in the supporting of goaf.
Among the figure: goaf regeneration country rock 1, heading 2, ductule 3, biliquid slurry 4 and AC field 5, be designated the ductule 3 of a and a end of AC field 5 and be connected, be designated the ductule 3 of b and the b end of AC field 5 and be connected.Fig. 1 (a) is that the AC field that heading is crossed in the supporting of goaf is arranged elevation; Fig. 1 (b) is that the AC field that heading is crossed in the supporting of goaf is arranged lateral view.
The specific embodiment
The present invention is further illustrated below in conjunction with accompanying drawing.
Embodiment 1:
The supporting method of being crossed the goaf by heading under the AC field effect of the present invention carries out supporting to the shaft station of crossing the goaf.Bracing Process is:
I, first to certain ore deposit 15
#Goaf regeneration country rock beyond the outline line of shaft station, coal seam carries out temporary lining, and being 15 ° according to outer limb is that 600mm squeezes into ductule in advance with circumferential distance, and ductule length is 1600mm;
II, build the AC field filling system, the critical piece of this system comprises goaf regeneration country rock, shaft station, ductule, cement paste and AC field;
III, in ductule injected water mud, add AC field, voltage is 660V, adulterant is acidic electrolyte bath Na
2SiO
3, concentration is 32gl
-1
IV, when grout spreading range during greater than 2.5m, stop the AC field effect, again goaf regeneration country rock is carried out permanent support, support pattern is stone cornering arch.
Goaf regeneration country rock bulk strength improves 260%.
Embodiment 2: cross AC field arrangement in the supporting of goaf to certain ore deposit 15 according to heading shown in Figure 1
#Temporary lining is carried out in assistant conveyance lane, exploiting field, coal seam, and the outer limb of ductule is 10 °, and ductule length is 2000mm, and permanent support is anchor net spray supporting, and goaf regeneration country rock bulk strength improves 350%.Other is with embodiment 1.
Embodiment 3: cross AC field arrangement in the supporting of goaf to certain ore deposit 15 according to heading shown in Figure 1
#Exploiting field, coal seam return airway carries out temporary lining, and ductule length is 2200mm, and permanent support is bolting with wire mesh, and goaf regeneration country rock bulk strength improves 280%.Other is with embodiment 1.
Claims (1)
1. a heading is crossed the supporting method in goaf, a kind ofly the heading of crossing the goaf to be carried out the method that temporary lining and permanent support combine adding under the AC field effect, first the regeneration country rock of the goaf beyond heading (2) outline line (1) is carried out temporary lining, being 10 ° ~ 30 ° according to outer limb is that 600 ~ 1200mm squeezes into ductule (3) in advance with circumferential distance, and ductule length is 1600 ~ 2600mm; After the AC field effect, again goaf regeneration country rock (1) is carried out permanent support, support pattern is the spray of anchor net or stone cornering arch, it is characterized in that in the after-applied AC field of ductule two fluid grouting, under the effect of electric osmose and electrophoresis electrokinesis, increase grout spreading range, concrete step is:
I, build the AC field filling system, the critical piece of this system comprises goaf regeneration country rock (1), heading (2), ductule (3), biliquid slurry (4) and AC field (5);
II, inject biliquid slurry (4) in ductule (3), add AC field (5), voltage is 660～1140V, and adulterant is acidic electrolyte bath Na
2SiO
3, Na
2SO
4, NaCl or Na
3PO
4, concentration is 0～410gl
-1
III, when grout spreading range during greater than 2m, stop the AC field effect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110361794 CN102505949B (en) | 2011-11-12 | 2011-11-12 | Support method for coal seam roadway to cross gob |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110361794 CN102505949B (en) | 2011-11-12 | 2011-11-12 | Support method for coal seam roadway to cross gob |
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| Publication Number | Publication Date |
|---|---|
| CN102505949A CN102505949A (en) | 2012-06-20 |
| CN102505949B true CN102505949B (en) | 2013-10-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110361794 Active CN102505949B (en) | 2011-11-12 | 2011-11-12 | Support method for coal seam roadway to cross gob |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103485808B (en) * | 2013-10-12 | 2015-07-01 | 山东科技大学 | Electro-osmosis home position modified roadway anchoring method of underground swelling soft rock |
| CN104314583A (en) * | 2014-09-03 | 2015-01-28 | 山西煤炭运销集团晋城有限公司 | Support method of coal seam roadway empty area |
| CN105927243B (en) * | 2016-06-21 | 2018-06-22 | 山东科技大学 | A kind of underground country rock tomography suspension device and method for protecting support |
| CN109184752B (en) * | 2018-09-29 | 2021-09-07 | 陕西陕煤黄陵矿业有限公司 | Supporting structure for coal mine to penetrate through old kiln goaf and supporting method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102071940A (en) * | 2010-12-31 | 2011-05-25 | 大同煤矿集团有限责任公司 | Construction method for mine shaft through multilayer goaf |
| CN102155249A (en) * | 2011-03-11 | 2011-08-17 | 中国矿业大学 | Method for supporting tunnel roof below mined-out area |
| CN102182174A (en) * | 2011-04-02 | 2011-09-14 | 河海大学 | Construction method for treating soft soil foundation by combining chemical solution injection electro-osmosis method and gravel pile |
| CN102182471A (en) * | 2011-03-23 | 2011-09-14 | 彬县水帘洞煤炭有限责任公司 | Advance support method for coal mine tunnel high-risk area |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0711133B2 (en) * | 1990-03-13 | 1995-02-08 | 三井不動産建設株式会社 | Electroosmotic dehydration method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102071940A (en) * | 2010-12-31 | 2011-05-25 | 大同煤矿集团有限责任公司 | Construction method for mine shaft through multilayer goaf |
| CN102155249A (en) * | 2011-03-11 | 2011-08-17 | 中国矿业大学 | Method for supporting tunnel roof below mined-out area |
| CN102182471A (en) * | 2011-03-23 | 2011-09-14 | 彬县水帘洞煤炭有限责任公司 | Advance support method for coal mine tunnel high-risk area |
| CN102182174A (en) * | 2011-04-02 | 2011-09-14 | 河海大学 | Construction method for treating soft soil foundation by combining chemical solution injection electro-osmosis method and gravel pile |
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| CN102505949A (en) | 2012-06-20 |
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