CN109026146B - Full-section drainage depressurization structure of lining of high-outer-water deep-buried water-conveying tunnel - Google Patents
Full-section drainage depressurization structure of lining of high-outer-water deep-buried water-conveying tunnel Download PDFInfo
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- CN109026146B CN109026146B CN201811087571.8A CN201811087571A CN109026146B CN 109026146 B CN109026146 B CN 109026146B CN 201811087571 A CN201811087571 A CN 201811087571A CN 109026146 B CN109026146 B CN 109026146B
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- drain pipe
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 136
- 239000010410 layer Substances 0.000 claims abstract description 19
- 239000002356 single layer Substances 0.000 claims abstract description 15
- 239000011435 rock Substances 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 239000011083 cement mortar Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000010923 batch production Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
- E21F16/02—Drainage of tunnels
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a full-section drainage depressurization structure of a high-external water depth buried water delivery tunnel lining, wherein a radial drain pipe is arranged at the top of the lining above a water surface line in the water delivery tunnel, a circular single-layer drainage belt is arranged below the water surface, the end part of the circular single-layer drainage belt is connected with a circular double-layer drainage belt and extends above the water surface, the circular single-layer drainage belt and the circular double-layer drainage belt are arranged between a primary support and the lining of the tunnel, an omega-shaped water collecting drain pipe is buried at the outer edge of the lining along the axial direction, a plurality of radial water collecting drain pipes communicated with the inner side of the tunnel are arranged along the length direction of the omega-shaped water collecting drain pipe, the omega-shaped water collecting drain pipe and the radial water collecting drain pipe are higher than the water surface line in the tunnel, and the top of the circular double-layer drainage belt and the omega-shaped water collecting drain pipe along the axial direction are fixed by nails and extend into the omega-shaped water collecting drain pipe, and water is discharged into an anchor hole through the omega-shaped water collecting drain pipe and the radial water collecting drain pipe. The problem that the external water pressure at the bottom of the lining structure of the high-external water tunnel is difficult to effectively reduce is solved, the overall stress condition of the lining structure is improved, and the safety of the lining structure is improved.
Description
Technical Field
The invention relates to a drainage structure of a hydraulic tunnel, in particular to a full-section drainage depressurization structure of a lining of a high-external-water deep-buried water delivery tunnel.
Background
The problem of high external water of the deeply buried tunnel is a difficult problem of secondary lining design of the tunnel, particularly the problem of high-pressure water tunnel sections with external water load exceeding 150m, and external water pressure is a control factor for controlling lining body type, reinforcement and even grouting design of the tunnel. In order to reduce the high external water pressure outside the lining, a radial drain pipe is usually arranged in a certain range at the top of the lining, and the external water pressure of the lining is reduced by guiding and draining crack water and pore water in surrounding rock at the top of the hole, but the drainage depressurization measure has the following limitations:
(1) in order to prevent the infiltration of the inner water, the drain pipe can only be arranged above the normal running water level in the hole, and the drainage depressurization effect only plays a role in the upper area of the lining.
(2) The pipe diameter of the drain pipe is not too large, the drainage capacity of a single drain pipe is limited, sufficient hole sections are supplied for groundwater, and the drainage depressurization effect of the drain pipe is limited.
(3) The drainage system has the advantages that the drainage pipe is encrypted, the drainage depressurization capacity of the drainage system can be improved by increasing the depth of the drainage pipe, the drainage depressurization range cannot be effectively enlarged, and meanwhile, the ecological problem caused by underground water loss is easily caused.
(4) For supplying the stratum fully, only laying the drain pipe at the top easily leads to the uneven distribution of the external water pressure of the lining to be 'small at the top' and big at the bottom, which causes uneven stress of the lining, brings risks to the safety of the lining, and even can not meet the bearing requirement.
According to the analysis, the underground water is fully supplied to the high external water and pressure-bearing water hole section, and the surrounding rock permeability coefficient is large, so that the corresponding lining external water pressure reduction coefficient is also large, the effect of reducing the lining bottom external water pressure by only arranging the drain pipe at the top of the lining is not obvious, the aim of uniformly reducing the lining external water pressure cannot be achieved, the uneven lining external water pressure is born, and the stable and safe operation of a lining structure is not facilitated.
Disclosure of Invention
The invention aims to solve the technical problem of providing a full-section drainage depressurization structure of a lining of a high-external-water deep-buried water delivery tunnel, which can effectively and uniformly reduce high external water pressure on the outer side of the lining.
In order to solve the problems, the invention adopts the following technical scheme: a full-section drainage depressurization structure of a high-outer water deep-buried water delivery tunnel lining is characterized in that a radial drain pipe is arranged at the top of the lining above a water surface line in the water delivery tunnel, a circular single-layer drain belt is arranged below the water surface, the end part of the circular single-layer drain belt is connected with a circular double-layer drain belt and extends above the water surface, the circular single-layer drain belt and the circular double-layer drain belt are arranged between a primary support and the lining of the tunnel, an omega-shaped water collecting and draining pipe is buried at the outer edge of the lining along the axial direction, a plurality of radial water collecting and draining pipes communicated with the inner side of the tunnel are arranged along the length direction of the omega-shaped water collecting and draining pipe, the omega-shaped water collecting and draining pipe and the radial water collecting and draining pipe are higher than the water surface line in the tunnel, and the top of the circular double-layer drain belt and the omega-shaped water collecting and draining pipe along the axial direction are fixed by anchor nails and extend into the omega-shaped water collecting and draining pipe, and the water is drained into the omega-shaped water collecting and draining pipe.
The radial capillary penetrating drain pipe penetrates through the tunnel lining to penetrate into surrounding rocks of the tunnel to a certain depth, and is arranged in a rectangular shape or a quincuncial shape according to a set row distance in the axial direction of the tunnel.
The water permeable sides of the annular double-layer drainage belt are oppositely arranged, a gap between the upper part and the primary support is filled with cement mortar, the lower water impermeable side is tightly attached to the primary support, and the length of the annular double-layer drainage belt penetrating into the omega-shaped water collecting and draining pipe is not less than 2cm; the water permeable side of the annular single-layer drainage belt is tightly attached to the primary support.
The distribution of the omega-shaped water collecting and draining pipes in the axial direction of the hole is set according to the width and the row spacing of the annular water draining belt, the omega-shaped water collecting and draining pipes are connected by adopting a hollow circular draining pipe and a PVC connecting piece, and the total length of the water collecting and draining pipes in the axial direction is adjusted according to the parting condition of the lining pouring section.
The invention has the beneficial effects that: the problem that the external water pressure at the bottom of the lining structure of the high-external water tunnel is difficult to effectively reduce is solved, the condition that the lining structure bears the action of uneven external water pressure is avoided, the integral stress condition of the lining structure is improved, the safety of the lining structure is improved, and the lining structure of the tunnel can adapt to the high-external water load condition of more than 150 m. The invention has the characteristics of batch production outside the hole and direct installation inside the hole, and the construction is quick and simple; meanwhile, the invention utilizes the negative pressure formed by capillary force and siphon force to actively drain water, a drainage channel is not easy to be blocked, and the invention has good adaptability and high reliability to different lithology strata.
Drawings
FIG. 1 is a schematic diagram of a full section drainage depressurization structure of a high-external water deep buried tunnel lining used in the invention.
Fig. 2 is an enlarged view at a of fig. 1.
FIG. 3 is a schematic view of a structure with a section B-B expanded.
Detailed Description
The invention is described in further detail below with reference to the attached drawings and detailed description:
as shown in figure 1, according to the full-section drainage depressurization structure of the lining of the high-external-water deep-buried water delivery tunnel, a radial drain pipe 1 is arranged at the top of the lining above a water surface line in the water delivery tunnel, a circular single-layer drain belt 3 is arranged below the water surface, the end part of the circular single-layer drain belt 3 is connected with a circular double-layer drain belt 2 and extends above the water surface, the circular single-layer drain belt 3 and the circular double-layer drain belt 2 are arranged between a primary support 4 and the lining 5 of the tunnel, an omega-shaped water collecting drain pipe 6 is buried at the outer edge of the lining 5 along the axial direction, a plurality of radial water collecting drain pipes 7 communicated with the inner side of the tunnel are arranged along the length direction of the omega-shaped water collecting drain pipe 6, the omega-shaped water collecting drain pipe 6 and the radial water collecting drain pipe 7 are higher than the water surface line in the tunnel, the top of the circular double-layer drain belt 2 and the axial direction omega-shaped water collecting drain pipe 6 are fixed by anchor nails 8 and extend into the omega-shaped water collecting drain pipe 6, and water is discharged into the tunnel through the omega-shaped water collecting drain pipe 6 and the radial water collecting drain pipe 7. The siphon action of the pressure difference between the high external water pressure outside the lining and the water collecting and draining pipe inside the lining promotes the hydraulic communication in the water collecting and draining channel inside the lining. The full-section drainage structure composed of the capillary permeable drainage pipe and the capillary permeable drainage belt can effectively and uniformly reduce the external water pressure of the lining, improve the overall stress condition of the lining structure and improve the stability of the lining structure.
The radial capillary penetrating drain pipe 1 penetrates through the tunnel lining 5 to penetrate into surrounding rocks of the tunnel to a certain depth, and is arranged in a rectangular shape or a quincuncial shape according to a set row distance in the axis direction of the tunnel. External water pressure outside the lining of the upper part of the drainage tunnel is reduced through a capillary drainage pipe penetrating into surrounding rock.
As shown in fig. 2, the water permeable sides of the annular double-layer drainage belt 2 are oppositely arranged, a gap between the upper part and the primary support 4 is filled with cement mortar 9, and the lower water impermeable side is tightly attached to the primary support 4, so that the blocking of the drainage channel of the annular drainage belt during lining backfilling grouting is prevented. The length of the double-ring double-layer drainage belt 2 extending into the inner part 6 is not less than 2cm, so that the drainage channel is prevented from being unsmooth due to the fact that the drainage belt is pulled out of an omega-shaped water collecting and draining pipe when construction interference occurs; the water permeable side of the annular single-layer drainage belt 3 is tightly attached to the primary support 4.
As shown in fig. 3, the drainage system connected with the annular double-layer drainage belt 2 is composed of an omega-shaped water collecting and draining pipe 6, a hollow circular draining pipe 10, a PVC connecting piece 11, a connecting elbow 12, a plug 13 and a radial draining pipe 7 in the axial direction of the hole. The distribution of the omega-shaped water collecting and draining pipes 6 in the axial direction of the hole is set according to the width and the row distance of the circumferential water draining belt, the omega-shaped water collecting and draining pipes 6 are connected by adopting a hollow circular water draining pipe 10 and a PVC connecting piece 11, and the total length of the water draining pipes in the axial direction is adjusted according to the parting condition of the lining pouring section.
According to the invention, a radial capillary permeable drain pipe is arranged above the water surface line of the water delivery tunnel, a circumferential capillary permeable drain belt is arranged below the water surface, and the drain water is discharged into the tunnel through a water collecting and draining system above the water surface. The problem that the external water pressure at the bottom of the lining structure of the high-external-water tunnel is difficult to effectively reduce is solved, the situation that the lining structure bears unfavorable uneven external water pressure is avoided, the integral stress condition of the lining structure is improved, the safety of the lining structure is improved, and the lining structure of the tunnel can adapt to the high external water load condition of more than 150 m. The invention has the characteristics of batch production outside the hole and direct installation inside the hole, and the construction is quick and simple; meanwhile, the invention utilizes the negative pressure formed by capillary force and siphon force to actively drain water, a drainage channel is not easy to be blocked, and the invention has good adaptability and high reliability to different lithology strata.
The full-section drainage depressurization structure of the lining of the high-external-water deep-buried water conveying tunnel can also make other different forms of changes or variations on the basis of the above description for those of ordinary skill in the art. It is not intended to be exhaustive of all embodiments, and all such obvious variations and modifications that come within the spirit of the invention are desired to be included within the scope of the invention.
Claims (4)
1. A full-section drainage depressurization structure of high-external water deep-buried water delivery tunnel lining is characterized in that a radial capillary permeable drain pipe (1) is arranged at the top of the lining above a water surface line in the water delivery tunnel, a circular single-layer drainage belt (3) is arranged below the water surface, the end part of the circular single-layer drainage belt (3) is connected with a circular double-layer drainage belt (2) and extends above the water surface, the circular single-layer drainage belt (3) and the circular double-layer drainage belt (2) are arranged between a primary support (4) and the lining (5) of the tunnel, an omega-shaped drain collecting pipe (6) is buried at the outer edge of the lining (5) along the axial direction, a plurality of radial drain collecting pipes (7) communicated with the inner side of the tunnel are arranged along the length direction of the omega-shaped drain collecting pipe (6), the omega-shaped drain collecting pipe (6) and the radial drain collecting pipes (7) are higher than the water in the tunnel, the top of the circular double-layer drainage belt (2) and the axial direction omega-shaped drain collecting pipe (6) are fixed by anchor nails (8) and extend into the omega-shaped drain collecting pipe (6), and the omega-shaped drain collecting pipe (6) is discharged into the omega-shaped drain collecting pipe (6) along the length direction.
2. The full-section drainage depressurization structure of the high-external-water-depth buried water tunnel lining according to claim 1 is characterized in that the radial capillary permeable drainage pipe (1) penetrates through the tunnel lining (5) to penetrate deep into surrounding rocks of the tunnel to a certain depth, and is arranged in a rectangular shape or a quincuncial shape according to a set row distance in the axis direction of the tunnel.
3. The full-section drainage depressurization structure of the lining of the high-water-content deep-buried water-conveying tunnel according to claim 1 is characterized in that the water permeable sides of the annular double-layer drainage belt (2) are oppositely arranged, a gap between the upper part and the primary support (4) is filled with cement mortar (9), the lower water impermeable side is tightly attached to the primary support (4), and the length of the annular double-layer drainage belt (2) penetrating into an omega-shaped water collecting and draining pipe (6) is not less than 2cm; the water permeable side of the annular single-layer drainage belt (3) is tightly attached to the primary support (4).
4. The full-section drainage depressurization structure of the high-water-depth buried water tunnel lining according to claim 1 is characterized in that the distribution of the omega-shaped water collecting and draining pipes (6) in the axial direction of the tunnel is set according to the width and the row distance of the annular drainage belt, the omega-shaped water collecting and draining pipes (6) are connected by adopting a hollow circular draining pipe (10) and a PVC connecting piece (11), and the total length of the water collecting and draining pipes in the axial direction is adjusted according to the parting condition of lining pouring sections.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811087571.8A CN109026146B (en) | 2018-09-18 | 2018-09-18 | Full-section drainage depressurization structure of lining of high-outer-water deep-buried water-conveying tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811087571.8A CN109026146B (en) | 2018-09-18 | 2018-09-18 | Full-section drainage depressurization structure of lining of high-outer-water deep-buried water-conveying tunnel |
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| Publication Number | Publication Date |
|---|---|
| CN109026146A CN109026146A (en) | 2018-12-18 |
| CN109026146B true CN109026146B (en) | 2023-08-22 |
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| CN201811087571.8A Active CN109026146B (en) | 2018-09-18 | 2018-09-18 | Full-section drainage depressurization structure of lining of high-outer-water deep-buried water-conveying tunnel |
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| CN115994494A (en) * | 2022-11-21 | 2023-04-21 | 长江三峡勘测研究院有限公司（武汉） | Method and system for estimating diving high external water pressure of multilayer slowly-inclined rock-soil body deep-buried tunnel |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010101062A (en) * | 2008-10-23 | 2010-05-06 | Ohbayashi Corp | Drainage structure of underground water, and construction method for tunnel equipped with the drainage structure |
| CN101985884A (en) * | 2010-08-30 | 2011-03-16 | 中铁第四勘察设计院集团有限公司 | Structure for preventing water at back of tunnel lining from longitudinally streaming |
| CN204000797U (en) * | 2014-08-22 | 2014-12-10 | 中国电建集团成都勘测设计研究院有限公司 | Hydropower Station Underground cavern exempts from damp-proofing wall and column system discharge structure thereof |
| CN204572060U (en) * | 2015-02-08 | 2015-08-19 | 山西省交通科学研究院 | A kind of tunnel in cold area circle draining system |
| CN207177967U (en) * | 2017-04-05 | 2018-04-03 | 周国海 | A kind of tunnel pressure release ejectment water installations |
| CN207176666U (en) * | 2017-08-16 | 2018-04-03 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of scupper structure |
| CN208858402U (en) * | 2018-09-18 | 2019-05-14 | 中水北方勘测设计研究有限责任公司 | A kind of high outer depth of water buries the tunneling boring drainage and step-down structure of water-conveyance tunnel lining cutting |
-
2018
- 2018-09-18 CN CN201811087571.8A patent/CN109026146B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010101062A (en) * | 2008-10-23 | 2010-05-06 | Ohbayashi Corp | Drainage structure of underground water, and construction method for tunnel equipped with the drainage structure |
| CN101985884A (en) * | 2010-08-30 | 2011-03-16 | 中铁第四勘察设计院集团有限公司 | Structure for preventing water at back of tunnel lining from longitudinally streaming |
| CN204000797U (en) * | 2014-08-22 | 2014-12-10 | 中国电建集团成都勘测设计研究院有限公司 | Hydropower Station Underground cavern exempts from damp-proofing wall and column system discharge structure thereof |
| CN204572060U (en) * | 2015-02-08 | 2015-08-19 | 山西省交通科学研究院 | A kind of tunnel in cold area circle draining system |
| CN207177967U (en) * | 2017-04-05 | 2018-04-03 | 周国海 | A kind of tunnel pressure release ejectment water installations |
| CN207176666U (en) * | 2017-08-16 | 2018-04-03 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of scupper structure |
| CN208858402U (en) * | 2018-09-18 | 2019-05-14 | 中水北方勘测设计研究有限责任公司 | A kind of high outer depth of water buries the tunneling boring drainage and step-down structure of water-conveyance tunnel lining cutting |
Non-Patent Citations (1)
| Title |
|---|
| 富水隧洞排水设计及效果分析;田建林;顾耀民;;水利水电工程设计(第02期);19-21 * |
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