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Continuous beam bell mouth friction loss testing method based on karst cave and underground river environment

A test method and technology of karst caves, which are applied in earthwork drilling, shaft equipment, wellbore lining, etc., can solve problems such as settlement and block falling at the top of karst caves, and achieve the effects of preventing subsidence, improving stability and reliability, and ensuring construction quality

Pending Publication Date: 2020-12-11
CHINA RAILWAY NO 5 ENG GRP +2
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  • 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.

Method used

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  • Continuous beam bell mouth friction loss testing method based on karst cave and underground river environment
  • Continuous beam bell mouth friction loss testing method based on karst cave and underground river environment
  • Continuous beam bell mouth friction loss testing method based on karst cave and underground river environment

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Embodiment Construction

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0033] Such as Figure 1 to Figure 4 As shown, the present invention is based on a kind of embodiment of the continuous beam bell mouth friction loss test method of the karst cave underground river environment, the environment includes the karst cave 1 and the underground river 2 at the bottom of the karst cave 1, the tunnel passes through the karst cave 1, and the tunnels at the two ends of the karst cave 1 It 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:

[0034] S1: Excavate section A of the tunnel to penetrate the karst cave 1;

[0035] S2: Divert the underground river 2 so that the underground river 2 does not flow through the cave 1;

[0036] S3: backfill the karst cave 1 until it is backfilled to the foundation surf...

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Abstract

The invention provides a continuous beam bell mouth friction loss testing method based on a karst cave and underground river environment. The method comprises the following steps that S1, a tunnel section 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 a plurality of 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 section B; S7, abutments are constructed on the tunnel section A; S8, a first section, a second section, a third section and a closure section are divided; S9, a supporting foundation of the tunnel section A is constructed; and S10, continuous beams are continuously constructed from the first section to the closure section according to the section 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 continuous beam bell mouth friction loss testing method based on 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 passing through the karst cave h...

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 肖承倚周浩周旭光李坤潘宗凯
Owner CHINA RAILWAY NO 5 ENG GRP
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