Extra-large karst cave bottom treatment construction method

A construction method and technology for karst caves, which are applied in the fields of earthwork drilling, infrastructure engineering, soil protection, etc., can solve the problem that the reinforcement construction method cannot be applied to extra-large karst caves, and achieve the effects of improving work efficiency, saving time and reducing costs.

Inactive Publication Date: 2015-04-22
CHINA RAILWAY NO 3 GRP CO LTD +1
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Problems solved by technology

[0005] In order to solve the problem that the existing reinforcement construction method cannot be applied to extra-large karst caves, the present invention provides a construction method for treating the bottom of extra-large karst caves

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  • Extra-large karst cave bottom treatment construction method

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Embodiment Construction

[0045]The specific embodiment of the present invention will be further described in conjunction with the accompanying drawings.

[0046] General situation of the tunnel cave: According to the change design of a certain tunnel, the karst cavity section of D2K473+505~+585 adopts the full masonry backfill scheme, and the bottom of the cave is supplemented by drilling. There are beaded filling caves at the bottom of the cave, and small empty cave. The specific treatment plan is as follows:

[0047] The tunnel bottom of section D2K473+505~+585 is basically in the dissolution cavity, and the bottom of the tunnel in this section is backfilled by masonry; the collapse of the wall of the solution cavity in section D2K473+565~+585 affects the safety of the tunnel lining structure, and the masonry backfill surface and the hole The wall cavity is backfilled with waste ballast. Before backfilling, the gravel soil at the bottom of the solution cavity should be removed. Among them, D2K473...

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Abstract

The invention belongs to the technical field of tunnel traversing extra-large karst cave construction, aims at solving the problem that an existing foundation construction method cannot be suitable for extra-large karst caves and provides an extra-large karst cave bottom treatment construction method. A pipe-following drilling process is adopted to synchronously follow a sleeve in the drilling process, the sleeve penetrates through an easily-collapsed stratum to partition the easily-collapsed stratum, the pipe-following drilling is stopped at the karst cave position, then fine aggregate concrete is adopted for backfill, and continuous drilling is completed after backfill is completed. Working efficiency is greatly improved, cost is reduced, and time is saved. The pipe-following drilling process is effective compared with construction of the easily-collapsed stratum and can be universally applied to slope protection under similar geological conditions and foundation base reinforcement treatment projects. A full-automatic casting recording instrument is adopted for recoding, treatment is timely performed in an intermittent or slurry mixture ratio adjusting mode if one-single casting amount is too large or no pressure exists for long time, meanwhile the requirements for casting pressure and casting amount are ensured, and casting reinforcement effect is ensured.

Description

technical field [0001] The invention belongs to the technical field of construction of tunnels passing through extra-large karst caves, and in particular relates to a construction method for treating the bottom of extra-large karst caves. Background technique [0002] During the construction of the tunnel, it will encounter the situation of crossing the karst cave. When crossing the super large karst cave, the conventional construction method often cannot handle it, or the processing cost is very high, or the quality of the project after processing cannot be guaranteed. [0003] For example: during the excavation and construction of a certain tunnel, a giant dissolved cavity was revealed. The bottom elevation of the dissolved cavity was on average about 45m lower than the designed track surface of the line. The cave hall was treated with concrete backfill. Beaded karst caves are developed in the range of 20-30m below, and the bearing capacity of the basement cannot meet the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/08E21D9/00
CPCE21D9/00E21D9/10E21D9/12E21D11/10
Inventor 马良张博轩宋国映王波
Owner CHINA RAILWAY NO 3 GRP CO LTD
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