CN110541422A - Construction method for tunnel crossing hole bias landslide zone - Google Patents

Construction method for tunnel crossing hole bias landslide zone Download PDF

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Publication number
CN110541422A
CN110541422A CN201910839131.1A CN201910839131A CN110541422A CN 110541422 A CN110541422 A CN 110541422A CN 201910839131 A CN201910839131 A CN 201910839131A CN 110541422 A CN110541422 A CN 110541422A
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CN
China
Prior art keywords
tunnel
landslide
arch
excavation
construction
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910839131.1A
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Chinese (zh)
Inventor
任正刚
蔡军
孙建平
李开军
沈宇鹏
刘康辉
朱荣辉
王知远
裴宏宇
綦举胜
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CCCC First Highway Engineering Co Ltd
CCCC First Highway Engineering Group Co Ltd
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CCCC First Highway Engineering Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CCCC First Highway Engineering Group Co Ltd filed Critical CCCC First Highway Engineering Group Co Ltd
Priority to CN201910839131.1A priority Critical patent/CN110541422A/en
Publication of CN110541422A publication Critical patent/CN110541422A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/20Securing of slopes or inclines
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/20Securing of slopes or inclines
    • E02D17/202Securing of slopes or inclines with flexible securing means
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/20Securing of slopes or inclines
    • E02D17/207Securing of slopes or inclines with means incorporating sheet piles or piles
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03FSEWERS; CESSPOOLS
    • E03F3/00Sewer pipe-line systems
    • E03F3/04Pipes or fittings specially adapted to sewers
    • E03F3/046Open sewage channels
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04Lining with building materials
    • E21D11/10Lining 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
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/14Lining predominantly with metal

Abstract

The invention discloses a construction method for a tunnel to pass through a tunnel portal bias landslide zone, and relates to a tunnel portal bias landslide processing scheme and a tunnel arch protection cover excavation construction method. Before the tunnel passes through the hole and biases the landslide zone, in order to prevent the tunnel construction from disturbing the landslide zone, firstly reinforcing the landslide zone by adopting a duct grouting and anchor spraying mode, and constructing an anti-slide retaining wall to prevent the landslide zone from biasing and sliding; and secondly, before the tunnel portal is excavated, building a protective arch above the tunnel arch part, and covering and excavating the tunnel under the protection of the protective arch to ensure the construction safety. The construction method is suitable for the construction of tunnel engineering in mountain tunnels and urban shallow-buried tunnels in landslide sections, requires poor geological conditions of surrounding rocks at the tunnel opening, is a strongly weathered rock stratum or soil layer, and is suitable for mechanical excavation of tunnel bodies.

Description

Construction method for tunnel crossing hole bias landslide zone
Technical Field
The invention relates to a construction scheme for a tunnel to pass through a bias landslide zone, in particular to a tunnel portal bias landslide treatment scheme and a tunnel arch protection cover excavation construction method.
Background
in recent years, according to the development planning of the state 'five longitudinal directions and seven transverse directions', the highway construction in China enters a rapid development period, tunnel engineering is more and more commonly applied to the highway construction and is limited by mountainous terrain, tunnel lines often need to pass through valleys with complex geology, a plurality of tunnel holes are positioned in a shallow-buried bias landslide area, so that the tunnel is very difficult to enter and exit, and the existing tunnel-passing landslide area usually adopts a construction method of unloading, reinforcing and avoiding winding, so that the following problems exist
1. The engineering quantity is large. When a landslide body at a tunnel entrance is unloaded, the slope of a mountain is often required to be slowed down to ensure the stability of the landslide surface under the influence of a landslide fracture surface, so that the unloading work amount of the landslide body is large, the influence range is large, and secondary landslide of the mountain is often caused if the landslide body is not properly treated;
2. the cost is high. When the landslide body is protected and reinforced, the landslide body is large in area and wide in range, and a large amount of grouting, blocking and protecting and the like are needed, so that the engineering cost is greatly increased;
3. The safety quality assurance coefficient is low. When the tunnel cave slope zone is processed, secondary landslide is generated due to disturbance caused by unloading, construction safety is threatened, in addition, in the construction process, due to large engineering quantity, the construction period is long, the exposure time of workers in the landslide zone range is long, and safety problems are easily caused. Even if the tunnel enters the tunnel smoothly, in the operation process of the highway, the phenomena of debris flow and landslide can be generated in rainy seasons under the influence of outdoor weather, and the operation safety of the highway is not facilitated.
Disclosure of Invention
the invention aims to provide a construction scheme of a tunnel through landslide zone, which has the advantages of short construction period, low cost and guaranteed safety quality, aiming at the defects of the background technology and according to the principle that a tunnel entrance is early in and late out.
the technical scheme of the invention is a construction method of a tunnel crossing hole bias landslide zone, which comprises the following construction processes:
s1 digging a masonry intercepting ditch around the bias landslide zone.
S2, temporarily brushing the slope of the slide edge body, wherein the slope brushing rate is 1: 1-1: 1.5.
and protecting the slope surface of S3 by adopting a net hanging and an anchor spraying.
S4, vertically drilling small guide pipes along the slope surface, and grouting.
And S5, driving a steel pipe pile into the landslide on the side, close to the landslide mountain, of the tunnel.
S6 building the anti-slide retaining wall along the side of the tunnel departing from the landslide mountain.
S7, excavating a soil mould, and pouring the concrete arch ring.
and S8, backfilling for the first time, wherein the backfilling height is controlled to be 2m at the vault.
And S9, changing open excavation into underground excavation, wherein the excavation mode adopts an annular excavation soil-retention method.
And S10 carrying out secondary backfilling on the arch.
the method is characterized in that the brushing is carried out before tunnel arch protection excavation, the brushing range cannot be too large, only the range of a landslide body influencing the tunnel arch protection construction is brushed, and a water cut trench needs to be built along the outer side of the landslide body before the brushing.
the steel pipe pile and the ground form an included angle range larger than 45 degrees, the steel pipe pile is driven into the bedrock, if the steel pipe pile does not enter the bedrock, the length of the steel pipe pile needs to be increased, grouting is conducted, and the bearing capacity of the tunnel arch protection foundation is improved.
The inner mold of the arch protector adopts a soil mold, one end of the arch springing is positioned on the steel pipe pile, and the other end is arranged on the anti-slip retaining wall.
From the above description, the construction method for the tunnel to pass through the bias landslide zone has the following advantages: (1) follow the principle that the tunnel advances early and goes out late, through reducing the tunnel open cut tunnel, the slip mass of entrance to a cave is kept away to the dark hole of extension tunnel, reduces the construction risk that unfavorable geology brought. (2) The landslide body is only needed to be brushed and protected simply, large-area unloading and treatment are not needed, the engineering quantity is small, and the construction cost is saved. (3) And the earth mould is used as the inner mould of the arch protection, so that the cost is low and the construction period is short. (4) The tunnel excavation is carried out under the arch protection, the influence of external weather is avoided, and the construction is safe.
Drawings
FIG. 1 is a cross-sectional view of a tunnel through landslide with an arch guard cover excavated;
Detailed Description
Referring to fig. 1, the technical scheme adopted by the invention is a construction method of a tunnel crossing cave entrance bias landslide zone, and the flow of the construction method is as follows:
1) before tunnel construction, the geological condition and the influence range of a tunnel bias landslide zone are subjected to field investigation, and the construction length of changing a tunnel open cut tunnel into a blind hole for excavation is determined.
2) And (4) excavating a masonry intercepting ditch on the periphery of the bias landslide zone to prevent surface water from scouring a mountain slope above the tunnel to cause landslide mass sliding.
3) The landslide body that influences in the tunnel construction scope carries out interim brush slope and protection, and the brush slope rate is 1: 1-1: 1.5, the slope surface of the sliding edge body is protected by adopting net hanging and anchor spraying, C25 concrete is sprayed, the thickness is not 10cm, the steel bar net phi is 6mm, the grid interval is 20 x 20cm, the anchor rod adopts a phi 22mm mortar anchor rod, the length is 4m, the interval is 1.5 x 1.5m, and the plum blossom type arrangement is adopted.
4) And small guide pipes are vertically arranged along the slope, the small guide pipes are made of phi 42 steel flower pipes, the length L is 3.0m, the distance between every two adjacent guide pipes is 1.5 x 1.5m, and the small guide pipes are arranged in a quincunx manner.
5) And (3) driving a steel pipe pile into the landslide at the side of the tunnel close to the landslide mountain, wherein the arched position of the tunnel is provided with an outer diameter phi 89mm, the length 15m and a crossing angle with the ground of 45 degrees.
6) and an anti-slip retaining wall is built on one side, deviating from the landslide mountain body, of the tunnel, the retaining wall is built by M10 grouted rubbles, and an arch protection base of the tunnel is reserved on the back side of the retaining wall.
7) And excavating an earth arch outside the excavation contour line of the tunnel vault, and pouring a concrete arch ring by using an earth mould, wherein one end of the arch ring is supported by a lock pin steel pipe arranged in the landslide mountain body, and the other end of the arch ring is supported on a base reserved behind the anti-skidding retaining wall.
8) And (4) finishing the manufacturing of the arch ring, and after the design strength is reached, primarily backfilling the top of the tunnel, wherein the backfilling height is controlled to be 2m of the arch top.
9) the tunnel is changed from open excavation to underground excavation, mechanical excavation is adopted under the protection of the arch ring, and the excavation mode adopts an annular excavation soil-centered method.
10) and (5) completing the excavation of the tunnel body, and timely constructing a secondary lining and a tunnel portal. And the arch top is backfilled for the second time, the height of the side slope and the upward slope of the tunnel is reduced, and the slip of the landslide body is controlled.
the above description is only an embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of infringing the present invention.

Claims (5)

1. a construction method of a tunnel crossing hole bias landslide zone is characterized by comprising the following steps: the construction process of the construction method is as follows,
s1 excavating a masonry intercepting ditch at the periphery of the bias landslide zone;
S2, temporarily brushing the slope of the slide edge body, wherein the slope brushing rate is 1: 1-1: 1.5;
s3 slope protection is carried out by adopting net hanging and anchor spraying;
s4, vertically drilling small guide pipes along the slope surface, and grouting;
S5, driving a steel pipe pile into the landslide on one side of the tunnel close to the landslide mountain;
S6, building an anti-slip retaining wall along one side of the tunnel, which is far away from the landslide mountain;
S7, excavating a soil mold, and pouring a concrete arch ring;
S8, backfilling for the first time, wherein the backfilling height is controlled to be 2m of the vault;
S9, changing open excavation into underground excavation, wherein the excavation mode adopts an annular excavation soil-retention method;
And S10 carrying out secondary backfilling on the arch.
2. the construction method of the tunnel crossing hole bias landslide zone according to claim 1, wherein: the method is characterized in that the brushing is carried out before tunnel arch protection excavation, the brushing range cannot be too large, only the range of a landslide body influencing the tunnel arch protection construction is brushed, and a water cut trench needs to be built along the outer side of the landslide body before the brushing.
3. the construction method of the tunnel crossing hole bias landslide zone according to claim 1, wherein: the steel pipe pile and the ground form an included angle range larger than 45 degrees, the steel pipe pile is driven into the bedrock, and if the steel pipe pile does not enter the bedrock, the length of the steel pipe pile needs to be increased, and grouting is carried out.
4. The construction method of the tunnel crossing hole bias landslide zone according to claim 1, wherein: the inner mold of the arch protector adopts a soil mold, one end of the arch springing is positioned on the steel pipe pile, and the other end is arranged on the anti-slip retaining wall.
5. The construction method of the tunnel crossing hole bias landslide zone according to claim 1, wherein: the construction method comprises the following steps:
1) Before tunnel construction, carrying out field investigation on the geological condition and the influence range of a tunnel bias landslide zone, and determining the construction length of changing a tunnel open cut tunnel into a blind hole for excavation;
2) Excavating a masonry intercepting ditch at the periphery of the bias landslide zone to prevent surface water from scouring a mountain slope above the tunnel to cause landslide mass sliding;
3) the landslide body that influences in the tunnel construction scope carries out interim brush slope and protection, and the brush slope rate is 1: 1-1: 1.5, protecting the slope surface of the edge slipping body by adopting net hanging and anchor spraying, spraying C25 concrete, wherein the thickness is less than 10cm, the steel bar net phi is 6mm, the grid interval is 20 x 20cm, the anchor rod adopts a phi 22mm mortar anchor rod, the length is 4m, the interval is 1.5 x 1.5m, and the arrangement is in a quincunx shape;
4) Vertically arranging small guide pipes along the slope, wherein the small guide pipes are phi 42 steel flower pipes, the length L is 3.0m, the distance is 1.5 x 1.5m, and the small guide pipes are arranged in a quincunx shape;
5) A steel pipe pile is arranged in the landslide at the side of the tunnel close to the landslide mountain, the arch waist of the tunnel, the outer diameter phi 89mm, the length 15m and the intersection angle with the ground are 45 degrees;
6) Building an anti-slip retaining wall along one side of the tunnel, which is far away from the landslide mountain, wherein the retaining wall is built by M10 grouted rubbles, and an arch protection base of the tunnel is reserved on the back side of the retaining wall;
7) Excavating an earth arch outside an excavation contour line of the vault of the tunnel, pouring a concrete arch ring by using an earth mould, wherein one end of the arch ring is supported by a lock pin steel pipe arranged in a landslide mountain body, and the other end of the arch ring is supported on a base reserved behind an anti-skidding retaining wall;
8) After the arch ring is manufactured and the design strength is reached, primarily backfilling the top of the tunnel, wherein the backfilling height is controlled to be 2m of the arch top;
9) The tunnel is changed from open excavation to underground excavation, mechanical excavation is adopted under the protection of an arch ring, and an annular excavation soil-centered method is adopted in the excavation mode;
10) the hole body is excavated and constructed to form a secondary lining and a tunnel portal in time; and the arch top is backfilled for the second time, the height of the side slope and the upward slope of the tunnel is reduced, and the slip of the landslide body is controlled.
CN201910839131.1A 2019-09-05 2019-09-05 Construction method for tunnel crossing hole bias landslide zone Pending CN110541422A (en)

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Cited By (7)

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Publication number Priority date Publication date Assignee Title
CN111322087A (en) * 2020-04-22 2020-06-23 四川省商业建设有限责任公司 Construction method for soft soil highway tunnel entrance semi-open semi-hidden tunnel in mountainous area
CN111608701A (en) * 2020-06-02 2020-09-01 中铁隧道局集团有限公司 Method for treating roof collapse of shallow tunnel entrance section
CN111648790A (en) * 2020-06-12 2020-09-11 安徽省公路桥梁工程有限公司 Shallow-buried bias tunnel entry structure and construction method
CN111911183A (en) * 2020-07-01 2020-11-10 中铁二院重庆勘察设计研究院有限责任公司 Tunnel hole entering construction method based on end wall type guide wall structure
CN112127900A (en) * 2020-09-07 2020-12-25 中国水利水电第十四工程局有限公司 Construction method for hidden half-wall and half-arch protection structure of exposed arch of shallow-buried bias tunnel penetrating through accumulation body
CN112502188A (en) * 2020-12-10 2021-03-16 河南博源电力设备股份有限公司 Power communication comprehensive pipe rack in easy-to-slide area and construction method thereof
CN113186842A (en) * 2021-05-08 2021-07-30 四川省交通勘察设计研究院有限公司 Treatment method capable of permanently preventing top of open cut tunnel from being overloaded

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111322087A (en) * 2020-04-22 2020-06-23 四川省商业建设有限责任公司 Construction method for soft soil highway tunnel entrance semi-open semi-hidden tunnel in mountainous area
CN111608701A (en) * 2020-06-02 2020-09-01 中铁隧道局集团有限公司 Method for treating roof collapse of shallow tunnel entrance section
CN111608701B (en) * 2020-06-02 2022-04-26 中铁隧道局集团有限公司 Method for treating roof collapse of shallow tunnel entrance section
CN111648790A (en) * 2020-06-12 2020-09-11 安徽省公路桥梁工程有限公司 Shallow-buried bias tunnel entry structure and construction method
CN111911183A (en) * 2020-07-01 2020-11-10 中铁二院重庆勘察设计研究院有限责任公司 Tunnel hole entering construction method based on end wall type guide wall structure
CN111911183B (en) * 2020-07-01 2022-03-04 中铁二院重庆勘察设计研究院有限责任公司 Tunnel hole entering construction method based on end wall type guide wall structure
CN112127900A (en) * 2020-09-07 2020-12-25 中国水利水电第十四工程局有限公司 Construction method for hidden half-wall and half-arch protection structure of exposed arch of shallow-buried bias tunnel penetrating through accumulation body
CN112502188A (en) * 2020-12-10 2021-03-16 河南博源电力设备股份有限公司 Power communication comprehensive pipe rack in easy-to-slide area and construction method thereof
CN112502188B (en) * 2020-12-10 2022-03-22 河南博源电力设备股份有限公司 Power communication comprehensive pipe rack in easy-to-slide area and construction method thereof
CN113186842A (en) * 2021-05-08 2021-07-30 四川省交通勘察设计研究院有限公司 Treatment method capable of permanently preventing top of open cut tunnel from being overloaded

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