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Continuous beam second segment construction method based on karst cave underground river environment tunnel construction

A technology of tunnel construction and construction method, which is applied in the direction of tunnel, tunnel lining, earthwork drilling and mining, etc. It can solve problems such as settlement and block falling on the top of karst cave, and achieve the effects of preventing settlement, improving stability and reliability, and improving safety

Pending Publication Date: 2020-12-11
CHINA RAILWAY NO 5 ENG GRP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Since the tunnel has to pass through the huge karst cave hall, and there is an underground river at the bottom, both the early construction and later operation bring high risks, such as the top of the karst cave falling off, and the bottom due to subsidence due to the underground river, etc.

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  • Continuous beam second segment construction method based on karst cave underground river environment tunnel construction
  • Continuous beam second segment construction method based on karst cave underground river environment tunnel construction
  • Continuous beam second segment construction method based on karst cave underground river environment tunnel construction

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Embodiment Construction

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] Such as Figure 1 to Figure 3 As shown, the present invention is based on an embodiment of the continuous beam second section construction method of tunnel construction in the environment of karst caves and underground rivers. The environment includes a karst cave 1 and an underground river 2 at the bottom of the karst cave 1. The tunnel is section A of the tunnel, and the tunnel passing through the karst cave 1 is section B of the tunnel; the construction method includes the following steps:

[0033] S1: Excavate section A of the tunnel to penetrate the karst cave 1;

[0034] S2: Divert the underground river 2 so that the underground river 2 does not flow through the cave 1;

[0035] S3: backfill the karst cave 1 until it is backfilled to the foundation surface of the tunnel;

[0036] S4: Carry out protective treatment on t...

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Abstract

The invention provides a continuous beam second segment construction method based on karst cave underground river environment tunnel construction. The method comprises the following steps that S1, a tunnel segment A is excavated to penetrate through a karst cave; S2, an underground river is diverted; S3, the karst cave is backfilled to a tunnel foundation surface; S4, the cave wall is protected, and multiple anchor cables are constructed; S5, the karst cave is filled, and the anchor cables are connected with a backfill body; S6, the backfill body is excavated to form a tunnel segment B; S7, abutments are constructed on the tunnel segment A; S8, a first segment, a second segment, a third segment and a closure segment are divided; S9, a supporting foundation of the tunnel segment A is constructed; and S10, continuous beams are constructed continuously from the first segment to the closure segment according to the segment sequence. The method has the advantages of being stable, reliable,high in safety and capable of preventing sedimentation.

Description

technical field [0001] The invention mainly relates to the tunnel construction technology of the karst cave underground river environment, in particular to a second segment construction method of the continuous beam based on the tunnel construction of the karst cave underground river environment. Background technique [0002] Yujingshan Tunnel is located in Weixin County, Yunnan Province, with a total length of 6306m and a double-track tunnel. On July 23, 2016, the karst cave was detected by advanced drilling at the face of the small mileage end of the Hengdong work area, and a giant karst cave hall and underground river were discovered after the reveal. The karst cave is about 230m long and 93m wide in a roughly rectangular shape. The top of the karst cave is in the shape of a dome. Underground river, the width of the river is 5-15m. The tunnel passes through the giant karst cave hall, the two sides of the giant karst cave hall are the tunnel A section, and the tunnel pas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10E21D20/02E21D11/15
CPCE21D11/10E21D20/02E21D11/152
Inventor 黄泽谢胜周涛王定富李小兵周浩
Owner CHINA RAILWAY NO 5 ENG GRP