CN112282784B - Construction method for tunnel crossing underpass close to karst cave underground river - Google Patents
Construction method for tunnel crossing underpass close to karst cave underground river Download PDFInfo
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- CN112282784B CN112282784B CN202011100863.8A CN202011100863A CN112282784B CN 112282784 B CN112282784 B CN 112282784B CN 202011100863 A CN202011100863 A CN 202011100863A CN 112282784 B CN112282784 B CN 112282784B
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- 238000010276 construction Methods 0.000 title claims abstract description 27
- 238000009412 basement excavation Methods 0.000 claims abstract description 12
- 230000000694 effects Effects 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 239000011435 rock Substances 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 238000004904 shortening Methods 0.000 claims 2
- 238000005728 strengthening Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 239000004567 concrete Substances 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 235000019994 cava Nutrition 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
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- 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
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- 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
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
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- 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
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
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- 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
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a construction method of a tunnel crossing underpass close-proximity karst cave underground river, which comprises the following steps: s1, measuring data information of a karst cave underground river through an manhole, finding out the position relation of the karst cave underground river, a tunnel face and a planned excavation tunnel section by combining geological advanced forecasting results, and analyzing relevant characteristics of the karst cave underground river; s2, adjusting an originally designed longitudinal slope from a tunnel section behind the tunnel face, increasing the longitudinal slope of the tunnel by deepening the middle space of the bottom plate, and meanwhile, adjusting the line to deviate at a proper angle and direction on the plane to reduce the intersection length of the front tunnel and the solution tunnel underground river. And S3, after the line of the tunnel is changed, strong support is carried out to cross and penetrate the solution cavity underground river. According to the invention, the tunnel crossing karst cave effect is enhanced by a space avoidance mode of combining the vertical surface with the plane, the original underground river system is not changed, the construction operation surface is at the supported tunnel section, the construction safety is ensured, and the tunnel crossing underground river system is suitable for tunnel crossing and approaching the karst cave underground river.
Description
Technical Field
The invention relates to a construction method for penetrating through a karst cave underground river in tunnel engineering, in particular to an excavation and support construction method for a short-distance crossing downward penetration close-connection karst cave underground river during drilling and blasting construction.
Background
With the continuous development of hydraulic engineering and traffic engineering in China, in the construction process of tunnel engineering in a karst region, the tunnel engineering sometimes inevitably encounters adverse geological conditions such as karst fault fracture zones, karst caves and underground rivers and the like, great hidden dangers are brought to construction safety, and the construction progress is seriously influenced.
The basic processing method of the karst geological problem of the tunnel can be summarized into 4 methods of guiding, blocking, spanning and winding, wherein the guiding means that a water guide pipe, a culvert pipe and other systems are adopted to guide karst water out of the range of the tunnel, and when the water burst of the tunnel is supplied intensively, the water guide method is not suitable for separately adopting water guide measures; the 'span' is directed at the huge karst cave, and aqueducts, channels and the like in the cave can be built to connect with the upper and lower tunnel sections, so that the 'span' is not suitable for the small karst cave; the winding is to change the axis of the tunnel for the karst cave which is difficult to process, and adopt avoidance measures to ensure the normal construction, and is not suitable for the large-scale karst fracture zone; the blocking is a method for sealing by grouting, concrete backfilling and other means, is suitable for small karst caves, but destroys the groundwater environment.
The invention Chinese patent CN101922303B provides a method for processing a tunnel passing through a cave hall of a inland river, which mainly comprises the following steps: 1) Searching the specific position of the underground river karst hall; 2) Excavating an auxiliary gallery to reveal a submarine karst hall; 3) Checking the stability of surrounding rocks at the top of the solution tunnel of the underground river hall, cleaning an accumulation body in the underground river hall to a position higher than the proper position of the top of the tunnel, applying a diversion channel, and arranging a water retaining dam on the underground river; 4) Two sides of the tunnel are provided with reinforced concrete bottom plates, and drilling and grouting are performed downwards on the bottom plates; 5) And excavating the treated underground river karst hall in the underground. The method can effectively avoid the water inrush and mud inrush phenomena possibly occurring in the underground river treatment process, ensure the safety and reliability of construction and operation, but cannot effectively solve the safety problem of the underground river with the karst cave passing through when the underground river which cannot enter people does not have the condition of changing or transforming the underground river.
Disclosure of Invention
The invention aims to provide a construction method of a tunnel crossing underpass close-proximity karst cave underground river, which does not need to change lines or reform the underground river, and realizes the crossing underpass close-proximity karst cave underground river by adjusting a water delivery tunnel excavation and supporting scheme. By locally reducing the bottom slope of the supported tunnel section, the structural safety of the supported tunnel section is not influenced, the disposal distance between the top of the tunnel and the underground river close to the karst cave is increased, and the safety is improved; the invention does not need to be constructed in the underground river, and can avoid the construction safety problems of inconvenient traffic, no ventilation, no illumination and the like under the complex terrain and geological conditions of the small underground river; the invention does not change the water flow channel of the underground river, and is beneficial to water environment protection.
In order to realize the purpose, the invention adopts the technical scheme that:
the construction of the tunnel crossing and underpass close to the karst cave underground river comprises the following steps:
s1, measuring data such as an on-way coordinate, an outline, an elevation and a flow of a karst cave underground river through an manhole, finding out a position relation between the karst cave underground river and a tunnel face and a planned excavation tunnel section by combining geological advanced forecasting results, and analyzing characteristics such as scale and area position of the karst cave underground river;
s2, designing a solution cavity underground river penetrating through the tunnel according to results, adjusting an originally designed longitudinal slope from a tunnel section behind the tunnel face, increasing the longitudinal slope of the tunnel by deepening the middle space of the bottom plate, and adjusting the line offset angle and direction on the plane to reduce the intersection length of the front tunnel and the solution cavity underground river.
And S3, after the line of the tunnel is changed, strong support is carried out to cross and penetrate the solution cavity underground river.
In the step S2, the middle space of the bottom plate is deepened, the situation that the bottom of a supported steel arch frame is suspended due to the deepening of two sides is avoided, the traffic passing requirement in the excavation process needs to be considered for plane turning, and when the tunnel passes through the underground river after adjustment, the thickness of the top of the tunnel and the rock stratum at the bottom of the underground river is not less than 2.0m.
In step S3, advance support should be strengthened during cross downward penetration, excavation footage is shortened, primary support strength is strengthened, primary support closing time is shortened, and times of tunnel convergence deformation and seepage monitoring are increased.
The invention has the beneficial effects that:
1) The structural safety of the supported tunnel section is not influenced, the treatment distance between the top of the tunnel and the underground river close to the karst cave is favorably increased, the crossing effect is enhanced, and the construction safety and reliability are ensured;
2) The water flow channel of the underground river is not changed, and the influence on the underground water environment is small;
3) Related construction organization and technical adjustment schemes are finished in the working face of the implemented water delivery tunnel section, construction in a river is not needed, construction conditions are relatively good, and the influence on the construction period is relatively small.
Drawings
FIG. 1 is a flow chart of the operation of an embodiment of the present invention;
FIG. 2 is a schematic plan view of a tunnel according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a tunnel A-A according to an embodiment of the present invention;
FIG. 4 is a longitudinal cross-sectional view of a tunnel face of an embodiment of the present invention;
FIG. 5 is a cross-sectional view of a tunnel face B-B of an embodiment of the present invention;
in the figure: 1-original tunnel axis; 1 a-diversion tunnel axis; 2-karst cave lobby; 2 a-the underground river; 3-face concrete; 3 a-concrete is backfilled in the karst cave; 4-manhole; 5-top arch sandbag; 6-top arch steel arch centering; 6 a-erected steel arch; 7-the bottom plate deepens the space.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples.
As shown in figures 1 to 4, the invention relates to a construction method of a tunnel intersection underpass proximity karst cave underground river, which comprises the following steps:
s1, organizing survey personnel to carry out detailed survey on the karst cave hall 2 and the underground river 2a through the manhole 4, and obtaining information such as approximate on-way coordinates of the karst cave hall 2 and the underground river 2a, the size of a karst cave bottom plate and the section of a cave body and the like by combining advanced geological forecast results. The tunnel section near the karst cave underground river 2a is reinforced by the tunnel face concrete 3, the karst cave backfill concrete 3a, the top arch sandbag 5 and the top arch steel arch 6, so that the construction safety is guaranteed.
S2, the axis 1 of the original tunnel is approximately parallel to the front of the karst cave hall 2 and the underground river 2a, and the longitudinal slope and the plane turning angle of the axis 1a of the modified tunnel are redesigned. In order to reduce the elevation of the tunnel as much as possible and increase the crossing effect, a bottom plate deepening space 7 is implemented at a proper position behind the tunnel face, only the middle part of the bottom plate is deepened, and the bottoms of the steel arches 6a erected on the two sides of the bottom plate are not deepened. The plane turning considers the traffic requirement in the excavation process, the turning angle is not more than 60 degrees, the turning radius is not less than 5 times of the diameter of the hole or the width of the hole, the axis 1a of the diversion tunnel intersects with the underground river 2a in front, and the thickness of the top of the hole from the rock stratum at the bottom of the underground river 2a is not less than 2.0m.
And S3, solidifying the tunnel face concrete 3 to be backfilled and the karst cave backfilling concrete 3a to reach 80% of design strength, and performing full-section secondary excavation. When the axis 1a of the diversion tunnel is close to a side wall of the underground river 2a and penetrates through the underground river 2a, the peripheral holes are encrypted by the vault, blasting parameters are controlled, the circulation footage is reduced to 2m, 4 grouting small guide pipes with the diameter of 42mm are adopted to strengthen support, and monitoring measurement in the aspects of tunnel convergence deformation, seepage and the like is strengthened.
The above embodiments are described in connection with the accompanying drawings, but the present invention is not limited thereto, and it should be noted that, for those skilled in the art, the technical solutions obtained by equivalent replacement or equivalent change without departing from the spirit of the present invention, and all of them belong to the protection scope of the present invention.
Claims (3)
1. A construction method for a tunnel crossing underpass close to a solution cavity underground river is characterized by comprising the following steps: it comprises the following steps:
s1, measuring data information of the karst cave underground river, including in-range coordinates, contours, elevations and flow, by personnel through an manhole, finding out the position relation of the karst cave underground river, a tunnel face and a planned excavation tunnel section by combining geological advanced forecasting results, and analyzing the characteristics of the karst cave underground river, including scale and area position;
s2, redesigning the longitudinal section and the plane turning of the axis of the modified tunnel according to the measurement result; the middle space of the bottom plate of the tunnel is deepened from the proper position of the tunnel section behind the tunnel face, but the erected steel arch frames on the two sides are not disturbed, the elevation of the tunnel in front is reduced, and the crossing effect is improved; meanwhile, adjusting the plane offset angle and direction of the axis of the front tunnel section, and adjusting the plane angle and turning radius to take the traffic requirement in the excavation construction process into consideration, so as to reduce the intersection length of the front tunnel and the solution tunnel underground river;
and S3, after the line of the tunnel is changed, strong support is carried out to cross and penetrate the solution cavity underground river.
2. The construction method of the tunnel crossing underpass proximity karst cave underground river according to claim 1, characterized in that: in step S2, according to the traffic requirement in the excavation process, when the adjusted tunnel passes through the underground river, the thickness of the rock stratum of the tunnel top from the bottom of the underground river is not less than 2m.
3. The construction method of the tunnel crossing underpass proximity karst cave underground river according to claim 1, characterized in that: in step S3, the measures of the strong support include shortening excavation footage, strengthening the strength of the primary support, shortening the sealing time of the primary support, and increasing the times of convergence deformation and seepage monitoring of the tunnel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011100863.8A CN112282784B (en) | 2020-10-15 | 2020-10-15 | Construction method for tunnel crossing underpass close to karst cave underground river |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011100863.8A CN112282784B (en) | 2020-10-15 | 2020-10-15 | Construction method for tunnel crossing underpass close to karst cave underground river |
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| CN112282784A CN112282784A (en) | 2021-01-29 |
| CN112282784B true CN112282784B (en) | 2023-03-17 |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101922303B (en) * | 2010-08-30 | 2012-05-09 | 中铁第四勘察设计院集团有限公司 | Method for treating tunnel passing through underground river karst hall |
| CN103742159B (en) * | 2014-01-18 | 2015-12-02 | 中铁三局集团有限公司 | The construction method of the large-scale molten type solution cavity that collapses of Tunnel Passing |
| CN105064280A (en) * | 2015-07-16 | 2015-11-18 | 中国水利水电第十四工程局有限公司 | Tunnel underground river water burst blockage construction method |
| CN107905799B (en) * | 2017-12-20 | 2021-03-19 | 中国建筑土木建设有限公司 | Reinforced structure of high-speed rail tunnel bottom water passing karst cave and construction method thereof |
| CN111695180B (en) * | 2020-05-20 | 2022-05-10 | 中铁二院工程集团有限责任公司 | Method for determining railway space line position in karst mountain area |
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Address after: 310002, No. 66, Funing lane, Shangcheng District, Zhejiang, Hangzhou Applicant after: Zhejiang water resources and Hydropower Survey and Design Institute Co.,Ltd. Address before: 310002, No. 66, Funing lane, Shangcheng District, Zhejiang, Hangzhou Applicant before: ZHEJIANG DESIGN INSTITUTE OF WATER CONSERVANCY & HYDROELECTRIC POWER |
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