CN111878093A - Construction method for side area of tunnel main tunnel in tunnel construction of karst cave and underground river environment - Google Patents

Construction method for side area of tunnel main tunnel in tunnel construction of karst cave and underground river environment Download PDF

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Publication number
CN111878093A
CN111878093A CN202010753984.6A CN202010753984A CN111878093A CN 111878093 A CN111878093 A CN 111878093A CN 202010753984 A CN202010753984 A CN 202010753984A CN 111878093 A CN111878093 A CN 111878093A
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CN
China
Prior art keywords
tunnel
construction
karst cave
cave
underground river
Prior art date
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
CN202010753984.6A
Other languages
Chinese (zh)
Inventor
陈彬
周浩
朱永清
潘宗凯
陈国辉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Railway No 5 Engineering Group Co Ltd
Fourth Engineering Co Ltd of China Railway No 5 Engineering Group Co Ltd
Original Assignee
China Railway No 5 Engineering Group Co Ltd
Fourth Engineering Co Ltd of China Railway No 5 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 China Railway No 5 Engineering Group Co Ltd, Fourth Engineering Co Ltd of China Railway No 5 Engineering Group Co Ltd filed Critical China Railway No 5 Engineering Group Co Ltd
Priority to CN202010753984.6A priority Critical patent/CN111878093A/en
Publication of CN111878093A publication Critical patent/CN111878093A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02BHYDRAULIC ENGINEERING
    • E02B3/00Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
    • E02B3/02Stream regulation, e.g. breaking up subaqueous rock, cleaning the beds of waterways, directing the water flow
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/18Making embankments, e.g. dikes, dams
    • 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
    • E21D11/105Transport 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
    • 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
    • E21D11/107Reinforcing elements therefor; Holders for the reinforcing elements
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D20/00Setting anchoring-bolts

Abstract

The construction method of the side area of the tunnel main tunnel for the construction of the tunnel in the karst cave and the underground river environment comprises the following steps of S1: excavating the tunnel A section to a communicated karst cave; s2: the underground river is redirected; s3: backfilling the karst cave; s4: protecting the cave wall of the karst cave, and uniformly applying a plurality of anchor cables on the cave wall; s5: filling the karst cave and connecting the anchor cable with the filled backfill body; s6: excavating the backfill body to form a tunnel section B; s7: measuring and lofting the left side and the right side of the tunnel section B; s8: performing mechanical excavation on the left side and the right side of the section B of the tunnel; s9: performing base surface treatment on the left side and the right side of the section B of the tunnel; s10: performing primary concrete spraying on the left side and the right side of the section B of the tunnel; s11: performing anchor cable and anchor rod construction on the left side and the right side of the section B of the tunnel; s12: and carrying out re-spraying on the left side and the right side of the section B of the tunnel. Has the advantages of stability, reliability, high safety, capability of preventing settlement and improving construction quality and efficiency.

Description

Construction method for side area of tunnel main tunnel in tunnel construction of karst cave and underground river environment
Technical Field
The invention mainly relates to a tunnel construction technology in a karst cave and underground river environment, in particular to a tunnel main cave side edge area construction method in tunnel construction in the karst cave and underground river environment.
Background
The Yujing mountain tunnel is located in Wexin county of Yunnan province, has the total length of 6306m and is a double-line tunnel. In 2016, 7, 23 days, a cave is detected by drilling a hole in advance on the small-mileage end face of a cross-cave working area, and a huge cave hall and a river are discovered after the cave is revealed. The karst cave is about 230m in transverse length and about 93m in width and is approximately rectangular, the top of the karst cave is in a vault shape, the vertical heights of halls are different from 50 m to 130m, the right side of the karst cave in the line direction is high, and the left side of the karst cave is low; and a river develops at the slope toe at the left side of the karst cave, and the river surface is 5-15 m wide. The tunnel passes through the huge karst cave hall, the two sides of the huge karst cave hall are tunnel A sections, and the tunnel passes through the karst cave hall and is B-C sections.
Because the tunnel needs to pass through a huge karst cave hall and the bottom is provided with a river, high risks are brought to early construction and later operation, such as block falling at the top of the karst cave, sinking at the bottom due to the river and the like.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a construction method for the side area of the tunnel main tunnel in the karst cave and underground river environment tunnel construction, which is stable and reliable, has high safety, can prevent settlement and can improve the construction quality and efficiency.
In order to solve the technical problems, the invention adopts the following technical scheme:
a construction method for side areas of a main tunnel cave in tunnel construction in a karst cave and underground river environment comprises the following steps that the environment comprises a karst cave and an underground river positioned at the bottom of the karst cave, the tunnel passes through the karst cave, the tunnels at two ends of the karst cave are tunnel A sections, and the tunnel passing through the karst cave is tunnel B section; the construction method comprises the following steps:
s1: excavating the tunnel A section to a communicated karst cave;
s2: the underground river is diverted so that the underground river does not flow through the karst cave;
s3: backfilling the karst cave until the karst cave is backfilled to the foundation surface of the tunnel;
s4: protecting the cave wall of the karst cave, and uniformly applying a plurality of anchor cables on the cave wall;
s5: filling the karst cave and connecting the anchor cable with the filled backfill body;
s6: excavating the backfill body to form a tunnel section B communicated with the tunnel section A;
s7: measuring and lofting the left side and the right side of the tunnel section B;
s8: performing mechanical excavation on the left side and the right side of the section B of the tunnel;
s9: performing base surface treatment on the left side and the right side of the section B of the tunnel;
s10: performing primary concrete spraying on the left side and the right side of the section B of the tunnel;
s11: performing anchor cable and anchor rod construction on the left side and the right side of the section B of the tunnel;
s12: and carrying out concrete re-spraying on the left side and the right side of the section B of the tunnel.
As a further improvement of the above technical solution:
in step S1, the lining construction is performed while performing support while excavating.
In step S2, a drainage tunnel is formed in communication with the river upstream so that the river does not flow through the cavern.
And plugging and backfilling the underground river at the downstream of the junction of the drainage tunnel and the underground river.
In step S4, steel fibers are applied to the cave wall and concrete is sprayed.
In step S5, grouting is performed in the gap between the backfill body and the cavern wall to seal the gap.
In step S6, the lining construction is performed while performing support while excavating.
Compared with the prior art, the invention has the advantages that:
the invention relates to a construction method of a side area of a tunnel main tunnel in tunnel construction of a karst cave and underground river environment, which comprises the following steps of changing the tunnel of the underground river to ensure that the underground river does not flow through the karst cave and eliminate the influence of a water area at the bottom of the karst cave; the karst cave is backfilled until the karst cave is filled, which is equivalent to the reconstruction treatment of the karst cave, so that the top of the karst cave is prevented from dropping blocks, and the safety is improved; the backfill body is connected with the cave wall of the karst cave by using the anchor cable, and then the diversion of the underground river is matched, so that the backfill body can be prevented from settling, and the stability and the reliability of the section B of the tunnel are improved; and the left side and the right side of the section B of the tunnel are simultaneously and mechanically excavated, so that the efficiency is improved, and the working medium quantity is also ensured.
Drawings
Fig. 1 is a plan view of the cave-underground river environment of the present invention.
Fig. 2 is a plan view of the cave river environment of the present invention (with a spillway tunnel).
FIG. 3 is a schematic diagram of the side region of the tunnel in the present invention.
The reference numerals in the figures denote:
1. karst cave; 2. a river under the river; 3. a water drainage hole.
Detailed Description
The invention will be described in further detail below with reference to the drawings and specific examples.
As shown in fig. 1 to fig. 3, an embodiment of the construction method for the side area of the tunnel main tunnel in tunnel construction in karst cave and underground river environment of the invention includes a karst cave 1 and an underground river 2 located at the bottom of the karst cave 1, the tunnel passes through the karst cave 1, the tunnels at the two ends of the karst cave 1 are tunnel a sections, and the tunnel passing through the karst cave 1 is tunnel B sections; the construction method comprises the following steps:
s1: excavating a tunnel section A to a communicating karst cave 1;
s2: the underground river 2 is diverted, so that the underground river 2 does not flow through the karst cave 1;
s3: backfilling the karst cave 1 until the karst cave is backfilled to the foundation surface of the tunnel;
s4: protecting the cave wall of the karst cave 1, and uniformly applying a plurality of anchor cables on the cave wall;
s5: filling the karst cave 1, and connecting the anchor cable with the filled backfill body;
s6: excavating the backfill body to form a tunnel section B communicated with the tunnel section A;
s7: measuring and lofting the left side and the right side of the tunnel section B;
s8: performing mechanical excavation on the left side and the right side of the section B of the tunnel;
s9: performing base surface treatment on the left side and the right side of the section B of the tunnel;
s10: performing primary concrete spraying on the left side and the right side of the section B of the tunnel;
s11: performing anchor cable and anchor rod construction on the left side and the right side of the section B of the tunnel;
s12: and carrying out concrete re-spraying on the left side and the right side of the section B of the tunnel.
In the method, the underground river 2 is diverted so that the underground river 2 does not flow through the karst cave 1, and the influence of a water area on the bottom of the karst cave 1 is eliminated; the karst cave 1 is backfilled until the karst cave is filled, namely the karst cave 1 is subjected to reconstruction treatment, so that the top of the karst cave 1 is prevented from dropping blocks, and the safety is improved; the backfill body is connected with the cave wall of the karst cave 1 by using the anchor cable, and then the diversion of the underground river 2 is matched, so that the backfill body can be prevented from settling, and the stability and reliability of the section B of the tunnel are improved; and the left side and the right side of the section B of the tunnel are simultaneously and mechanically excavated, so that the efficiency is improved, and the working medium quantity is also ensured.
In this embodiment, in step S1, lining construction is performed while performing support while excavating. By adopting the mode, the stability and the reliability of the excavated cavern can be ensured.
In this embodiment, in step S2, a drainage tunnel 3 communicating with the upstream of the underground river 2 is implemented so that the underground river 2 does not flow through the cavern 1. The water at the upstream of the underground river 2 is diverted by the drainage tunnel 3 and flows out from the area outside the karst cave 1, so that the subsequent backfill body can be prevented from generating settlement.
In this embodiment, the underground river 2 downstream of the junction of the drainage tunnel 3 and the underground river 2 is blocked and backfilled. Therefore, the phenomenon of water immersion can be prevented, and the subsequent backfilling construction is facilitated.
In this embodiment, in step S4, steel fibers are applied to the cavity wall of the cavern 1, and concrete is sprayed. The arrangement is convenient for the implementation of the anchor cable, and simultaneously, the block falling at the top of the karst cave 1 can be prevented.
In this embodiment, in step S5, grouting is performed in the gap between the backfill body and the cave wall of the cavern 1 to seal the gap. The stability and the reliability of the backfill body are further improved.
In this embodiment, in step S6, lining construction is performed while performing support while excavating. By adopting the mode, the stability and the reliability of the excavated cavern can be ensured.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments to equivalent variations, without departing from the scope of the invention, using the teachings disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.

Claims (7)

1. A construction method for a side area of a tunnel main tunnel in tunnel construction of a karst cave and a river environment is characterized in that the environment comprises a karst cave (1) and a river (2) positioned at the bottom of the karst cave (1), the tunnel passes through the karst cave (1), the tunnels at two ends of the karst cave (1) are a tunnel A section, and the tunnel passing through the karst cave (1) is a tunnel B section; the construction method comprises the following steps:
s1: excavating a tunnel section A to a communicating karst cave (1);
s2: the underground river (2) is diverted, so that the underground river (2) does not flow through the karst cave (1);
s3: backfilling the karst cave (1) until the karst cave is backfilled to the tunnel foundation surface;
s4: protecting the cave wall of the karst cave (1), and uniformly applying a plurality of anchor cables on the cave wall;
s5: filling the karst cave (1) and connecting the anchor cable with the filled backfill body;
s6: excavating the backfill body to form a tunnel section B communicated with the tunnel section A;
s7: measuring and lofting the left side and the right side of the tunnel section B;
s8: performing mechanical excavation on the left side and the right side of the section B of the tunnel;
s9: performing base surface treatment on the left side and the right side of the section B of the tunnel;
s10: performing primary concrete spraying on the left side and the right side of the section B of the tunnel;
s11: performing anchor cable and anchor rod construction on the left side and the right side of the section B of the tunnel;
s12: and carrying out concrete re-spraying on the left side and the right side of the section B of the tunnel.
2. The construction method of the tunnel main tunnel side area for karst cave underground river environment tunnel construction according to claim 1, characterized in that: in step S1, the lining construction is performed while performing support while excavating.
3. The construction method of the tunnel main tunnel side area for karst cave underground river environment tunnel construction according to claim 2, characterized in that: in step S2, a drainage tunnel (3) communicating with the upstream of the underground river (2) is constructed so that the underground river (2) does not flow through the cavern (1).
4. The construction method of the tunnel main tunnel side area for karst cave underground river environment tunnel construction according to claim 3, characterized in that: and plugging and backfilling the underground river (2) at the downstream of the junction of the drainage tunnel (3) and the underground river (2).
5. The construction method of the side area of the tunnel main tunnel for the construction of the tunnel in the karst cave and the underground river environment according to claim 4, wherein the construction method comprises the following steps: in step S4, steel fibers are applied to the cavity wall of the cave (1), and concrete is sprayed.
6. The construction method of the side area of the tunnel main tunnel for the construction of the tunnel in the karst cave and the underground river environment according to claim 5, wherein the construction method comprises the following steps: in step S5, grouting is performed in the gap between the backfill body and the cavity wall of the cavern (1) to seal the gap.
7. The construction method of the tunnel main tunnel side area for karst cave underground river environment tunnel construction according to claim 6, characterized in that: in step S6, the lining construction is performed while performing support while excavating.
CN202010753984.6A 2020-07-30 2020-07-30 Construction method for side area of tunnel main tunnel in tunnel construction of karst cave and underground river environment Pending CN111878093A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010753984.6A CN111878093A (en) 2020-07-30 2020-07-30 Construction method for side area of tunnel main tunnel in tunnel construction of karst cave and underground river environment

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Application Number Priority Date Filing Date Title
CN202010753984.6A CN111878093A (en) 2020-07-30 2020-07-30 Construction method for side area of tunnel main tunnel in tunnel construction of karst cave and underground river environment

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CN111878093A true CN111878093A (en) 2020-11-03

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CN111412002A (en) * 2020-04-21 2020-07-14 中铁二院工程集团有限责任公司 Anchor cable counter-pulling type supporting structure system and construction method
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