CN112065405A - Construction method of shallow-buried water-rich soil tunnel - Google Patents
Construction method of shallow-buried water-rich soil tunnel Download PDFInfo
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- CN112065405A CN112065405A CN202010983588.2A CN202010983588A CN112065405A CN 112065405 A CN112065405 A CN 112065405A CN 202010983588 A CN202010983588 A CN 202010983588A CN 112065405 A CN112065405 A CN 112065405A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
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- 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
- E21D11/003—Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices
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- 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
- E21D11/14—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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- 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
- E21F16/02—Drainage of tunnels
Abstract
The invention discloses a construction method of a shallow-buried water-rich soil tunnel, which has the advantages of reliable construction process and easy implementation, is a complete comprehensive solution scheme capable of ensuring construction safety, and can effectively solve the construction problem of the shallow-buried water-rich soil tunnel. The method comprises the following steps: step 1, after slope cleaning is completed, arranging a reinforcing support measure, and entering a hole in advance under the condition of reducing open cut; step 2, arranging a dewatering well from the earth surface along the axis of the tunnel, wherein the dewatering well is ahead of the excavation construction of the tunnel body of the tunnel, and the depth of the dewatering well exceeds the bottom plate of the tunnel; step 3, adopting a pipe shed for advanced support, excavating the pipe shed in advance of the tunnel body, and adopting a profile steel arch frame to support the pipe shed in the tunnel by following the excavation surface; and 4, dividing the section of the tunnel into a plurality of sequences of small sections for excavation by adopting a step-by-step excavation or amplitude excavation mode, and effectively realizing timely supporting and sealing of the excavation surface through the small section excavation. The invention is suitable for the industries related to tunnel infrastructure construction such as traffic, municipal administration, railways, water conservancy and hydropower.
Description
Technical Field
The invention relates to a construction method of a shallow-buried water-rich soil tunnel. The method is suitable for the industries related to tunnel capital construction such as traffic, municipal administration, railways, water conservancy and hydropower.
Background
Construction problems of soil tunnels are frequently encountered in the tunnel design construction process, shallow buried tunnels and soil layer rich underground water are common problems along with the soil tunnels. The construction of the shallow-buried water-rich soil tunnel faces a plurality of problems of difficult tunnel entrance, poor stability of the tunnel body, complex construction procedures and the like.
Disclosure of Invention
The invention aims to overcome the problems of difficult tunnel entrance, poor tunnel body stability, complex construction process and the like in the construction of a shallow-buried water-rich soil tunnel in the prior art, and provides a construction method of the shallow-buried water-rich soil tunnel.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention discloses a construction method of a shallow-buried water-rich soil tunnel, which comprises the following steps:
and 5, arranging convergence observation points around the tunnel in the tunnel, arranging surface settlement observation points on the surface along the axis of the tunnel body of the tunnel, and arranging measurement points in the tunnel and the surface simultaneously so as to realize three-dimensional monitoring of the soil tunnel construction process.
Preferably, the tunnels are evenly arranged around the top of the tunnel.
Preferably, the step 5 further comprises: stress and strain monitoring points are arranged on a profile steel arch support structure in the tunnel, and measuring points are arranged at the top of the profile steel arch, the center of the arch shoulder and the middle of the side wall.
Preferably, the convergence observation points in the step 5 are arranged at the top of the tunnel, the arch shoulder and the middle of the two side walls.
The technical scheme of the invention can be summarized as that the safe and efficient construction of the shallow water-rich soil tunnel is realized by the complete set of engineering measures of 'shallow-buried early advance, drainage advance, advance support, sequential excavation and three-dimensional monitoring' corresponding to the 5 steps.
Drawings
FIG. 1 is a longitudinal sectional view of an embodiment of the construction method of the present invention.
Fig. 2 is a cross-sectional view taken along line a-a of fig. 1.
In the figure: 1. a tunnel; 101 a tunnel bottom plate; 2. dewatering wells; 3. a pipe shed; 4. a profile steel arch frame; 5. convergence observation points; 6. a surface settlement observation point; 7. a soil body; 8. a natural ground; 9. and excavating schematic lines in a time-sharing manner.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
As shown in fig. 1 and fig. 2, the method for constructing a shallow tunnel rich in water soil according to the present invention comprises the following steps:
The step 1 can be summarized as "shallow buried early advance": in order to reduce the open cut square amount, waste slag and damage to the natural environment, the tunnel is advanced through strengthening support measures such as a pipe shed 3 and a profile steel arch frame 4.
And 2, arranging a dewatering well 2 from the earth's surface along the axis of the tunnel 1, wherein the dewatering well 2 is ahead of the excavation construction of the tunnel body of the tunnel 1, and the depth of the dewatering well 2 exceeds the tunnel bottom plate 101.
Said step 2 can be summarized as "drainage advance": aiming at the condition that the soil layer is rich in underground water, because the drainage of the underground water body needs time, a dewatering well is arranged from the earth surface along the axis of the hole, the excavation construction of the tunnel body is advanced, and the underground water level is pre-lowered in advance. The depth of the dewatering well needs to exceed the bottom plate of the tunnel so as to ensure that the underground water level can be reduced to be lower than the elevation of the bottom plate, excavation with water is avoided, and the construction safety is improved.
And 3, adopting the pipe shed 3 for advanced support, adopting the pipe shed 3 for excavation in advance of the tunnel body of the tunnel 1, and adopting the profile steel arch frame 4 for support close to the excavation surface in the tunnel 1. The pipe shed 3 is arranged around the top arch of the tunnel 1.
The step 3 can be summarized as a "advance support": the soil body 7 of the soil tunnel has large deformation, and the soil body is loosened and unstable due to excessive deformation. In advance in the excavation of tunnel body, adopt pipe shed advance support, advance support and the combination of tunnel inner mould steel bow member can effectively restrict the soil body and warp, increase the room stability in the hole.
And 4, dividing the section of the tunnel into a plurality of small sections for excavation (shown as a time-sharing excavation schematic line 9 in fig. 1) by adopting a step-by-step excavation or amplitude-division excavation mode, and simultaneously supporting and sealing the excavation surface in time.
The step 4 can be summarized as "sequential excavation": the self-stabilization time of the soil body of the soil tunnel is short, and the soil body needs to be supported in time. The tunnel section is divided into a plurality of sequences of small sections for excavation by adopting modes of step-by-step excavation or amplitude excavation and the like, and timely support and sealing of the excavation surface can be effectively realized through the small section excavation. The specific sequence excavation scheme needs to be determined by combining the size of the section of the tunnel. The cross-sectional area of the tunnel is 80m2Inside, the tunnel is generally excavated by steps, and the section of the tunnel is more than 80m2On the basis of the step-by-step excavation, each step can be further excavated in different frames.
Step 5, arranging convergence observation points 5 around the tunnel, arranging surface subsidence observation points 6 on the surface (namely, the natural ground 8) along the axis of the tunnel body of the tunnel 1, and arranging measurement points in the tunnel and the surface simultaneously so as to realize three-dimensional monitoring of the soil tunnel construction process; and meanwhile, stress and strain monitoring points are arranged on a profile steel arch support structure in the tunnel, and stress and strain measuring points are arranged at the top of the profile steel arch, the center of the arch shoulder and the middle of the side wall. And the convergence observation points 5 are arranged at the top of the tunnel, the arch shoulder and the middle parts of the side walls at two sides.
Said step 4 can be summarized as "stereoscopic monitoring": for the stability after effectively assessing the cavern excavation, monitoring facilities are arranged and are indispensable. The soil tunnel monitoring tunnel mainly adopts convergence monitoring, and convergence observation points are arranged around the tunnel. The stress and strain monitoring of the supporting and protecting structure in the tunnel is arranged according to actual needs. Because the cavern is shallow, the settlement observation point is arranged on the earth surface along the axis of the tunnel body, and the stability of the tunnel body is indirectly judged through the settlement observation on the ground. The measuring points are arranged in the tunnel and on the earth surface simultaneously, so that the three-dimensional monitoring of the soil tunnel construction process is realized.
Claims (4)
1. A construction method of a shallow-buried water-rich soil tunnel is characterized by comprising the following steps:
step 1, after slope cleaning is completed, arranging a reinforcing support measure, and entering a hole in advance under the condition of reducing open cut;
step 2, arranging a dewatering well from the earth surface along the axis of the tunnel, wherein the dewatering well is ahead of the excavation construction of the tunnel body, and the depth of the dewatering well exceeds the bottom plate of the tunnel;
step 3, adopting a pipe shed for advanced support, excavating the pipe shed in advance of the tunnel body, and adopting a profile steel arch frame to support the pipe shed in the tunnel by following the excavation surface;
step 4, dividing the tunnel section into a plurality of sequences of small sections for excavation by adopting a step-by-step excavation or amplitude excavation mode, and effectively realizing timely supporting and sealing of an excavation surface through the small section excavation;
and 5, arranging convergence observation points around the tunnel in the tunnel, arranging surface settlement observation points on the surface along the axis of the tunnel body of the tunnel, and arranging measurement points in the tunnel and the surface simultaneously so as to realize three-dimensional monitoring of the soil tunnel construction process.
2. The method as claimed in claim 1, wherein the pipe shed is disposed around the top of the tunnel.
3. The method as claimed in claim 1, wherein the step 5 further comprises: stress and strain monitoring points are arranged on a profile steel arch support structure in the tunnel, and measuring points are arranged at the top of the profile steel arch, the center of the arch shoulder and the middle of the side wall.
4. The method as claimed in claim 1, wherein the convergence observation points in step 5 are arranged at the top of the tunnel, at the shoulders and at the middle of the side walls.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010983588.2A CN112065405A (en) | 2020-09-18 | 2020-09-18 | Construction method of shallow-buried water-rich soil tunnel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010983588.2A CN112065405A (en) | 2020-09-18 | 2020-09-18 | Construction method of shallow-buried water-rich soil tunnel |
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| CN112065405A true CN112065405A (en) | 2020-12-11 |
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| CN202010983588.2A Pending CN112065405A (en) | 2020-09-18 | 2020-09-18 | Construction method of shallow-buried water-rich soil tunnel |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1571529A (en) * | 1976-05-15 | 1980-07-16 | Bochumer Eisen Heintzmann | Mehtod of and apparatus for tunneling and supporting an underground roadway |
| CN102287195A (en) * | 2011-05-13 | 2011-12-21 | 中铁四局集团第二工程有限公司 | Construction method of large-span tunnel passing through rapid transit railway with shallow tunneling process |
| CN108643935A (en) * | 2018-04-27 | 2018-10-12 | 中铁六局集团天津铁路建设有限公司 | The construction method in tunnel under rich water shallow embedding geology |
| CN109236328A (en) * | 2018-10-30 | 2019-01-18 | 广东省交通规划设计研究院股份有限公司 | The reinforcement means of shallow embedding mountain tunnel suitable for rich water soft layer |
| CN111472801A (en) * | 2020-04-09 | 2020-07-31 | 中铁二十三局集团第一工程有限公司 | Construction method for passing existing line under shallow-buried underground excavation drainage gallery |
-
2020
- 2020-09-18 CN CN202010983588.2A patent/CN112065405A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1571529A (en) * | 1976-05-15 | 1980-07-16 | Bochumer Eisen Heintzmann | Mehtod of and apparatus for tunneling and supporting an underground roadway |
| CN102287195A (en) * | 2011-05-13 | 2011-12-21 | 中铁四局集团第二工程有限公司 | Construction method of large-span tunnel passing through rapid transit railway with shallow tunneling process |
| CN108643935A (en) * | 2018-04-27 | 2018-10-12 | 中铁六局集团天津铁路建设有限公司 | The construction method in tunnel under rich water shallow embedding geology |
| CN109236328A (en) * | 2018-10-30 | 2019-01-18 | 广东省交通规划设计研究院股份有限公司 | The reinforcement means of shallow embedding mountain tunnel suitable for rich water soft layer |
| CN111472801A (en) * | 2020-04-09 | 2020-07-31 | 中铁二十三局集团第一工程有限公司 | Construction method for passing existing line under shallow-buried underground excavation drainage gallery |
Non-Patent Citations (1)
| Title |
|---|
| 郑全春 等: "某抽水蓄能工程潜埋土质隧洞的设计与施工", 《抽水蓄能电站工程建设文集2018》 * |
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Application publication date: 20201211 |