KR100986157B1 - Tunnel with drain bracing and supporting channel - Google Patents

Tunnel with drain bracing and supporting channel Download PDF

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Publication number
KR100986157B1
KR100986157B1 KR1020100032278A KR20100032278A KR100986157B1 KR 100986157 B1 KR100986157 B1 KR 100986157B1 KR 1020100032278 A KR1020100032278 A KR 1020100032278A KR 20100032278 A KR20100032278 A KR 20100032278A KR 100986157 B1 KR100986157 B1 KR 100986157B1
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South Korea
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tunnel
reinforcing
lining concrete
bracing
waterway
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KR1020100032278A
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Korean (ko)
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정경문
채종훈
고성만
이희만
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주식회사 도화종합기술공사
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Priority to KR1020100032278A priority Critical patent/KR100986157B1/en
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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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B13/00—Irrigation ditches, i.e. gravity flow, open channel water distribution systems
    • E02B13/02—Closures for irrigation conduits

Abstract

PURPOSE: A drain bracing and a tunnel installed with a reinforcement channel is provided to obtain the stability of a tunnel structure and prevent the deformation and crack of lining concrete. CONSTITUTION: A drain bracing and a tunnel installed with a reinforcement channel is constituted as follows. A reinforcement channel(30) is installed on both lower ends of a lining concrete(11). One-side wall of the reinforcement channel is installed on the lining concrete. Multiple inlets are formed on the other side wall of the reinforcement channel. Granular water-permeable material is installed between the reinforcement channels of both lower ends of the lining concrete.

Description

배수형 브레이싱 및 보강수로가 설치된 터널{TUNNEL WITH DRAIN BRACING AND SUPPORTING CHANNEL}Tunnel with drainage bracing and reinforcement channel {TUNNEL WITH DRAIN BRACING AND SUPPORTING CHANNEL}

본 발명은 터널 라이닝콘크리트(lining concrete)의 하부 보강 및 배수구조에 관한 것으로, 라이닝 콘크리트 하부 양단에 강제(鋼製) 보강수로를 밀착 설치하고, 이들 보강수로 사이를 횡단하는 중공브레이싱(中空bracing)을 터널 하부 투수재층에 매설함으로써, 터널 하부 지하수의 원활한 집수 및 배수는 물론 라이닝콘트리트의 변형을 방지할 수 있도록 한 것이다.
The present invention relates to a lower reinforcement and drainage structure of the lining concrete tunnel, the hollow bracing is installed in close contact with both ends of the lining concrete and cross between the reinforcing channels ) Is buried in the tunnel permeable layer to prevent the smooth collection and drainage of the groundwater below the tunnel and the deformation of the lining concrete.

도 1은 전형적인 터널의 횡단면을 도시한 것으로, 마제형(馬蹄形) 단면을 가지는 라이닝콘크리트(11) 하단에는 하부슬래브(12)가 구성되고, 하부슬래브(12)의 양단 하부에는 일종의 맹단면(盲斷面) 수로인 배수트렌치(14)가 설치된다.
FIG. 1 is a cross-sectional view of a typical tunnel. A lower slab 12 is formed at the bottom of a lining concrete 11 having a horseshoe shaped cross section, and a type of blind surface is formed at both lower ends of the lower slab 12. A drain trench 14, which is a channel, is installed.

도 1에 도시된 바와 같이 터널 주변 지반의 지하수위가 하부슬래브(12) 이상으로 형성될 경우, 하부슬래브(12) 하측 지반으로 유입된 지하수가 하부슬래브(12) 양측의 배수트렌치(14)로 유입되어 배수됨으로써, 터널 구조체에 작용하는 부압(浮壓)이 경감되게 된다.As shown in FIG. 1, when the groundwater level of the ground around the tunnel is formed above the lower slab 12, the groundwater introduced into the lower ground of the lower slab 12 is discharged to the drain trenches 14 on both sides of the lower slab 12. By flowing in and draining, the negative pressure acting on the tunnel structure is reduced.

그러나 이와 같은 종래의 터널에서는 시공과정에서 노반지지력을 확보하기 위하여 하부슬래브(12) 하측 지반에 대한 과도한 다짐이 진행되는 바, 투수성이 극도로 저하되어 하부슬래브(12) 양측의 배수트렌치(14)로의 원활한 지하수 유입에 한계가 있을 수 밖에 없었으며, 배수트렌치(14)는 하부슬래브(12) 및 하부 지반에 완전 매설된 구조물로서 접근이 사실상 불가능하여 유지관리에도 많은 애로점이 있었다.However, in such a conventional tunnel, in order to secure the roadbed bearing force during the construction process, excessive compaction is performed on the lower ground of the lower slab 12, and the water permeability is extremely reduced, so that the drainage trenches 14 on both sides of the lower slab 12 are reduced. There was no limit to the smooth groundwater inflow into the), drainage trench 14 is a completely buried structure in the lower slab 12 and the lower ground, which is virtually impossible to access, so there were many difficulties in maintenance.

따라서 지하수의 부압(浮壓)이 특별한 감세작용 없이 그대로 하부슬래브(12)에 작용되는 사례가 빈발할 뿐 아니라, 지하수와 함께 유입되는 토립자로 인하여 배수트렌치(14)내 공극이 폐색될 경우 지하수의 배수성능이 급감하게 되어 하부슬래브(12)를 비롯한 터널 구조체 전체에 심각한 부압이 작용하는 문제점이 있었다.Therefore, the case where the negative pressure of groundwater acts on the lower slab 12 without any special derating effect is frequent, and when the voids in the drainage trench 14 are blocked by the groundwater flowing in with the groundwater, There was a problem that the drainage performance is drastically reduced and a serious negative pressure is applied to the entire tunnel structure including the lower slab (12).

이에 지하수위의 상승시 하부슬래브(12) 등 터널 하부 구조체가 융기됨은 물론 그에 따라 라이닝콘크리트(11)가 변형되어 균열이 발생되는 등 터널 구조체의 안정성을 심각하게 위협하는 문제점이 있었다.Therefore, when the groundwater level rises, the lower slab 12 and the like, as well as the lower structure of the tunnel, there is a problem that seriously threatens the stability of the tunnel structure such that the lining concrete 11 is deformed and cracks are generated.

또한, 라이닝콘크리트(11) 하부에 설치되는 하부슬래브(12)는 횡방향 지지력을 사실상 기대할 수 없으므로 라이닝콘크리트(11)의 변형 억제에도 한계가 있을 수 밖에 없었으며, 하부슬래브(12)에 작용하는 부압으로 인한 변형 유발 및 하부슬래브(12)의 미미한 횡방향 지지력이 복합되어 터널구조체의 안전을 심각하게 위협하는 결과를 초래하게 된다.
In addition, since the lower slab 12 installed below the lining concrete 11 can not substantially expect the lateral bearing force, the deformation of the lining concrete 11 can not but be limited, and acts on the lower slab 12. The deformation caused by the negative pressure and the insignificant lateral bearing capacity of the lower slab 12 are combined, resulting in a serious threat to the safety of the tunnel structure.

본 발명은 전술한 문제점을 감안하여 창안한 것으로, 라이닝콘크리트(11)의 양측 하단에는 터널과 평행한 보강수로(30)가 각각 설치되되, 보강수로(30)의 일측 벽체가 라이닝콘크리트(11)와 밀착 설치되고, 보강수로(30)의 타측 벽체에는 다수의 유입구(31)가 형성되며, 라이닝콘크리트(11) 양측 하단의 보강수로(30) 사이에는 입자상 투수재(13)가 포설되고, 보강수로(30)의 각 유입구(31)에는 다수의 통수공(21)이 천공되고 터널 하부를 횡단하는 중공브레이싱(20)이 연결되어, 통수공(21)을 통하여 중공브레이싱(20) 내부로 유입된 지하수가 유입구(31)를 통하여 보강수로(30)로 유입 및 배출됨을 특징으로 하는 배수형 브레이싱 및 보강수로가 설치된 터널이다.The present invention was devised in view of the above-described problems, the reinforcing channel 30 parallel to the tunnel is provided on each side lower end of the lining concrete 11, one side wall of the reinforcing channel 30 is lining concrete ( 11) are installed in close contact with each other, a plurality of inlets 31 are formed in the other side wall of the reinforcing channel 30, and the particulate water permeable material 13 between the reinforcing channel 30 on both sides of the lining concrete 11 Installed, each inlet 31 of the reinforcing waterway 30 is a plurality of through holes 21 are drilled and the hollow bracing 20 that crosses the lower tunnel is connected, the hollow braking through the through hole (21) 20) The drainage type bracing and reinforcing waterway is installed in the tunnel, characterized in that the groundwater introduced into the inlet and outlet through the inlet 31 and discharged.

또한, 상기 보강수로(30)의 내부면에는 다수의 보강리브(32)가 돌출 형성되고, 유입구(31)의 상측에는 보강수로(30) 내부를 횡단하는 지지빔(33)이 설치됨을 특징으로 하는 배수형 브레이싱 및 보강수로가 설치된 터널이다.
In addition, a plurality of reinforcing ribs 32 protrude from the inner surface of the reinforcing waterway 30, and a support beam 33 crossing the inside of the reinforcing waterway 30 is installed above the inlet 31. A drainage bracing and reinforcing waterway is installed in the tunnel.

본 발명을 통하여, 종래 터널의 고질적인 문제점이었던 터널 하부 지하수로 인한 하부슬래브 내지 포장 노반의 융기 및 그로 인한 라이닝콘크리트의 변형 및 균열 현상을 근본적으로 방지할 수 있으며, 라이닝콘크리트 하단을 횡단 지지하는 중공브레이싱을 통한 터널 구조체의 안정성 제고 효과를 얻을 수 있다.Through the present invention, it is possible to fundamentally prevent the rise of the lower slab or pavement roadbed due to the tunnel groundwater, which is a conventional problem of the conventional tunnel, and the deformation and cracking of the lining concrete, and the hollow to cross the bottom of the lining concrete. The bracing can improve the stability of the tunnel structure.

특히, 터널 포장체 하부의 지하수 배수와 터널 포장체 상부의 배수를 외부로 노출된 하나의 보강수로로 수행할 수 있도록 함으로써, 전체 구조물을 간소화함은 물론 유지관리 편의성 또한 확보할 수 있다.
In particular, by allowing the groundwater drainage below the tunnel pavement and the drainage above the tunnel pavement to be performed as one reinforcement channel exposed to the outside, it is possible to simplify the entire structure as well as to maintain the convenience of maintenance.

도 1은 종래의 터널 횡단면도
도 2는 본 발명이 적용된 터널 횡단면도
도 3은 본 발명이 적용된 터널 구조물의 부분절단 사시도
도 4는 본 발명의 요부 발췌 부분절단 사시도
도 5는 본 발명이 적용된 터널 일 실시예 종단면도1 is a cross-sectional view of a conventional tunnel
Figure 2 is a cross-sectional view of the tunnel to which the present invention is applied
Figure 3 is a partially cut perspective view of the tunnel structure to which the present invention is applied
Figure 4 is a perspective view of the main portion of the excerpt of the present invention cut
Figure 5 is a longitudinal sectional view of one embodiment of the tunnel to which the present invention is applied

본 발명의 상세한 구성을 첨부된 도면을 통하여 설명하면 다음과 같다.The detailed configuration of the present invention through the accompanying drawings as follows.

우선 도 2는 본 발명의 대표단면도로서, 동 도면을 통하여 알 수 있는 바와 같이, 라이닝콘크리트(11) 양 하단부에 각각 보강수로(30)를 설치하고, 도 3에서와 같이 이들 보강수로(30)를 터널을 횡단하는 다수의 중공브레이싱(20)으로 연결한다.First, Figure 2 is a representative cross-sectional view of the present invention, as can be seen through the same figure, respectively, the reinforcing waterway 30 is provided on each of the lower end of the lining concrete 11, these reinforcing waterways ( 30 is connected to a plurality of hollow bracing 20 across the tunnel.

보강수로(30)는 도 2의 타원내 확대부에 도시된 바와 같이 U자형 단면을 가지는 강제(鋼製) 수로로서, 일측 벽체는 라이닝콘크리트(11)의 하단에 밀착 설치되고, 타측 벽체에는 다수의 유입구(31)가 형성된다.The reinforcing channel 30 is a forced channel having a U-shaped cross section as shown in the enlarged part of the ellipse of FIG. 2, and one wall is closely attached to the lower end of the lining concrete 11, and the other wall is A plurality of inlets 31 are formed.

보강수로(30)에 형성된 다수의 유입구(31)에는 각각 중공브레이싱(20)이 연결되는데, 이들 중공브레이싱(20)은 구조적 보강재와 지하수의 집수 및 배수로 역할을 겸비한 구조물로서, 도 4에 도시된 바와 같이, 중공브레이싱(20) 내, 외부를 연결하는 다수의 통수공(21)이 천공된다.A plurality of inlet openings 31 formed in the reinforcing waterway 30 are connected to the hollow bracing 20, respectively. These hollow bracings 20 have a structure that combines structural reinforcement and groundwater collection and drainage, which are shown in FIG. As described above, a plurality of water passages 21 for connecting the inside and the outside of the hollow brazing 20 are drilled.

보강수로(30) 또한 중공브레이싱(20)으로부터 유입된 지하수롤 집수하여 터널 종방향으로 배수하는 수로로서의 역할 뿐 아니라, 라이닝콘크리트(11) 하단에 밀착되어 중공브레이싱(20)의 양단에 작용하는 반력을 라이닝콘크리트(11)에 분포시키는 역할 또한 수행한다.The reinforcing channel 30 also serves as a channel for collecting groundwater rolls introduced from the hollow brazing 20 and draining it in the longitudinal direction of the tunnel, and is in close contact with the bottom of the lining concrete 11 to act on both ends of the hollow brazing 20. It also serves to distribute the reaction force to the lining concrete (11).

즉, 터널 하부를 횡단하는 보강부재를 직접 라이닝콘크리트(11) 양측 하단에 접합할 경우 접합부에 응력이 집중될 수 밖에 없으며, 그에 따라 상대적으로 취성체인 라이닝콘크리트(11)가 파괴될 수 있으므로, 보강수로(30)를 통하여 중공브레이싱(20)의 지지력을 라이닝콘크리트(11) 하단에 고르게 분포시키는 것이다.That is, when the reinforcing members crossing the lower part of the tunnel are directly joined to both lower ends of the lining concrete 11, the stress must be concentrated at the joining part, and thus the lining concrete 11, which is relatively brittle, may be destroyed. Through the channel 30 is to distribute the bearing force of the hollow braking 20 evenly to the bottom of the lining concrete (11).

본 발명이 적용된 터널에서의 지하수 유입경로는 도 2에서와 같이, 터널 주면 지반내 지하수가 일단 투수재(13)로 침투하고, 투수재(13)에 매설된 중공브레이싱(20)으로 유입된 후 중공브레이싱(20) 양단의 보강수로(30)로 유입되어 터널 종방향으로 배수되는 것이다.As the groundwater inflow path in the tunnel to which the present invention is applied, as shown in FIG. 2, the groundwater in the tunnel main surface ground once penetrates into the permeable material 13 and then flows into the hollow brazing 20 embedded in the permeable material 13. The hollow brazing 20 flows into the reinforcement waterway 30 at both ends and is drained in the longitudinal direction of the tunnel.

한편, 전술한 바와 같이, 본 발명의 보강수로(30)는 단순한 수로로서의 역할 뿐 아니라, 라이닝콘크리트(11)를 지지하는 역할 또한 수행하므로, 도 4에 도시된 바와 같이, 내부면에 다수의 돌출 보강리브(32)를 형성하여 구조적 강성을 확보하고, 특히 중공브레이싱(20)이 연결되는 유입구(31) 상측에는 보강수로(30) 내부를 횡단하는 지지빔(33)을 설치하여 중공브레이싱(20)이 연결된 부위의 보강수로(30) 변형을 억제한다.On the other hand, as described above, since the reinforcing channel 30 of the present invention not only serves as a simple channel, but also serves to support the lining concrete 11, as shown in FIG. Hollow brazing by forming a protruding reinforcing rib 32 to secure structural rigidity, in particular, a support beam 33 crossing the inside of the reinforcing channel 30 above the inlet 31 to which the hollow brazing 20 is connected. The deformation of the reinforcement channel 30 at the portion where the 20 is connected is suppressed.

도시된 실시예에서 보강수로(30)는 상부가 개방된 개수로 형태를 가지는데, 도 2 및 도 4에서와 같이, 보강수로(30) 상면을 터널 하부 포장체 상측으로 노출되도록 구성하고, 보강수로(30) 상단에 그레이팅(34)을 거치하여, 터널 포장체 하부의 지하수 배수와 터널 포장체 상부의 배수를 동시에 수행할 수 있도록 구성함으로써, 전체 구성을 간소화하고, 공사비를 절감하는 효과 또한 얻을 수 있다.In the illustrated embodiment, the reinforcement canal 30 has a shape in which the upper part is opened. As shown in FIGS. 2 and 4, the reinforcement canal 30 is configured to expose the upper surface of the tunnel lower package body. By mounting the grating 34 on the upper part of the reinforcing waterway 30, the groundwater drainage of the tunnel pavement and the drainage of the tunnel pavement can be simultaneously performed, thereby simplifying the overall configuration and reducing the construction cost. The effect can also be obtained.

또한, 도 5에서와 같이, 터널 종단상 전체 구간에 대하여 투수재(13)를 포설하는 것이 아니라, 중공브레이싱(20)의 주변에 제한적으로 투수재(13)를 포설함으로써 소기의 배수성능을 발현하면서도 재료를 절감하고 노반 지지력을 확보할 수 있다.
In addition, as shown in FIG. 5, rather than laying the permeable material 13 for the entire section of the tunnel end, the water permeable material 13 is provided around the hollow brazing 20 to express the desired drainage performance. At the same time, it saves materials and secures roadbed support.

11 : 라이닝콘크리트(lining concrete)
12 : 하부슬래브
13 : 투수재
14 : 배수트렌치(排水trench)
20 : 중공브레이싱(中空bracing)
21 : 통수공
30 : 보강수로
31 : 유입구
32 : 보강리브(補强rib)
33 : 지지빔
34 : 그레이팅(grating)11: lining concrete
12: lower slab
13: pitcher
14: drain trench
20: Hollow Bracing
21: water pipe
30: reinforcement channel
31: inlet
32: reinforcement rib
33: support beam
34: grating

Claims (2)

라이닝콘크리트(11)의 양측 하단에는 터널과 평행한 보강수로(30)가 각각 설치되되, 보강수로(30)의 일측 벽체가 라이닝콘크리트(11)와 밀착 설치되고;
보강수로(30)의 타측 벽체에는 다수의 유입구(31)가 형성되며;
라이닝콘크리트(11) 양측 하단의 보강수로(30) 사이에는 입자상 투수재(13)가 포설되고;
보강수로(30)의 각 유입구(31)에는 다수의 통수공(21)이 천공되고 터널 하부를 횡단하는 중공브레이싱(20)이 연결되어, 통수공(21)을 통하여 중공브레이싱(20) 내부로 유입된 지하수가 유입구(31)를 통하여 보강수로(30)로 유입 및 배출됨을 특징으로 하는 배수형 브레이싱 및 보강수로가 설치된 터널.
Reinforcing waterways 30 parallel to the tunnel are respectively installed at both lower ends of the lining concrete 11, and one wall of the reinforcing waterway 30 is closely attached to the lining concrete 11;
A plurality of inlets 31 are formed at the other side wall of the reinforcing channel 30;
The particulate water permeable material 13 is installed between the reinforcing waterways 30 at both lower ends of the lining concrete 11;
Each inlet 31 of the reinforcing waterway 30 is connected to a hollow bracing 20 through which a plurality of water holes 21 are drilled and traversed below the tunnel, and through the water holes 21, the inside of the hollow bracing 20. Tunnel with drainage type bracing and reinforcing waterway, characterized in that the groundwater introduced into the inlet and outlet through the inlet 31 to the reinforcing waterway (30).
제1항에 있어서, 보강수로(30)의 내부면에는 다수의 보강리브(32)가 돌출 형성되고;
유입구(31)의 상측에는 보강수로(30) 내부를 횡단하는 지지빔(33)이 설치됨을 특징으로 하는 배수형 브레이싱 및 보강수로가 설치된 터널.The inner surface of the reinforcing channel 30, a plurality of reinforcing ribs 32 protruding;
The upper side of the inlet 31 is a tunnel installed drainage bracing and reinforcing waterway, characterized in that the support beam 33 that traverses the interior of the reinforcing waterway (30) is installed.
KR1020100032278A 2010-04-08 2010-04-08 Tunnel with drain bracing and supporting channel KR100986157B1 (en)

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CN105927272A (en) * 2016-06-12 2016-09-07 中铁二院工程集团有限责任公司 Floor anchoring constraint tunnel lining structure
CN107905811A (en) * 2017-12-27 2018-04-13 中铁二院工程集团有限责任公司 The hollow longeron of foundation carries domes without the lining cutting of inverted arch type and its drainage system
CN108005690A (en) * 2017-12-27 2018-05-08 中铁二院工程集团有限责任公司 Boot last pedestal domes are without the lining cutting of inverted arch type and its drainage system
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CN109519192A (en) * 2019-01-23 2019-03-26 四川省交通运输厅公路规划勘察设计研究院 Store up drainage pressure-reducing construction and the tunnel structure across soft rock section in tunnel
CN110629626A (en) * 2019-11-11 2019-12-31 中信国安建工集团有限公司 Large-section tunnel construction structure and construction method
CN113565566A (en) * 2021-08-24 2021-10-29 中铁二院工程集团有限责任公司 Construction method for dewatering, depressurizing and stabilizing tunnel face of water-rich composite stratum
CN113756864A (en) * 2020-06-01 2021-12-07 中国铁道科学研究院集团有限公司铁道建筑研究所 Railway tunnel basement disease anchoring, grouting and draining integrated treatment method
CN113756865A (en) * 2020-06-01 2021-12-07 中国铁道科学研究院集团有限公司铁道建筑研究所 Diversion drainage system for railway tunnel foundation and construction method thereof

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JPH09256311A (en) * 1996-03-22 1997-09-30 Morimura Kosan Kk Draining method and drain induction body for penetrated water in permeable pavement road
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CN105927272B (en) * 2016-06-12 2019-01-04 中铁二院工程集团有限责任公司 Bottom plate anchors restricted type tunnel lining structure
CN105927272A (en) * 2016-06-12 2016-09-07 中铁二院工程集团有限责任公司 Floor anchoring constraint tunnel lining structure
CN107905811A (en) * 2017-12-27 2018-04-13 中铁二院工程集团有限责任公司 The hollow longeron of foundation carries domes without the lining cutting of inverted arch type and its drainage system
CN108005690A (en) * 2017-12-27 2018-05-08 中铁二院工程集团有限责任公司 Boot last pedestal domes are without the lining cutting of inverted arch type and its drainage system
CN108005690B (en) * 2017-12-27 2024-01-19 中铁二院工程集团有限责任公司 Arch structure non-inverted arch type lining of boot-shaped base
CN107905811B (en) * 2017-12-27 2024-01-19 中铁二院工程集团有限责任公司 Inverted arch-free lining of foundation hollow longitudinal beam bearing arch structure
CN109083681A (en) * 2018-09-20 2018-12-25 中铁西南科学研究院有限公司 A kind of high water head rich water tunnel tunnel bottom construction and water discharge method
CN109519192B (en) * 2019-01-23 2023-10-10 四川省公路规划勘察设计研究院有限公司 Tunnel stores up drainage decompression structure and stride across tunnel structure in soft rock district
CN109519192A (en) * 2019-01-23 2019-03-26 四川省交通运输厅公路规划勘察设计研究院 Store up drainage pressure-reducing construction and the tunnel structure across soft rock section in tunnel
CN110629626A (en) * 2019-11-11 2019-12-31 中信国安建工集团有限公司 Large-section tunnel construction structure and construction method
CN113756865A (en) * 2020-06-01 2021-12-07 中国铁道科学研究院集团有限公司铁道建筑研究所 Diversion drainage system for railway tunnel foundation and construction method thereof
CN113756864A (en) * 2020-06-01 2021-12-07 中国铁道科学研究院集团有限公司铁道建筑研究所 Railway tunnel basement disease anchoring, grouting and draining integrated treatment method
CN113565566B (en) * 2021-08-24 2023-03-28 中铁二院工程集团有限责任公司 Construction method for dewatering, depressurizing and stabilizing tunnel face of water-rich composite stratum
CN113565566A (en) * 2021-08-24 2021-10-29 中铁二院工程集团有限责任公司 Construction method for dewatering, depressurizing and stabilizing tunnel face of water-rich composite stratum

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