Large-section loess tunnel supporting system and supporting construction method

A loess tunnel and large-section technology, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve the problems of large deformation of surrounding rock, many excavation sections, and increased deformation due to exposure time.
CN110761808APending Publication Date: 2020-02-07CHINA RAILWAY 20 BUREAU GRP
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHINA RAILWAY 20 BUREAU GRP
Publication Date
2020-02-07

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Abstract

The invention discloses a large-section loess tunnel supporting system and a supporting construction method. The large-section loess tunnel supporting system comprises a tunnel forepoling structure, atunnel initial supporting structure and a tunnel secondary lining. The upper surface of an inverted arch secondary lining in the tunnel secondary lining is a horizontal plane, and an inverted arch backfill layer is arranged on the horizontal plane. The supporting construction method comprises the following steps of firstly digging a tunnel and conducting initial supporting; and secondly constructing the secondary lining and backfilling the inverted arch. The large-section loess tunnel supporting system is reasonable in design, easy and convenient to construct, high in construction efficiencyand good in use effect, the tunnel forepoling structure, the tunnel initial supporting structure and the tunnel secondary lining constitute a combined supporting system to stably and reliably supportthe large-section loess tunnel, the upper surface of the inverted arch of the secondary lining is adjusted to be a horizontal plane, the construction process of the inverted arch of the tunnel can beeffectively simplified, and the rigidity of the inverted arch of the tunnel is greatly improved; in this way, the construction efficiency of the tunnel secondary lining is improved, the ring sealingtime of the tunnel secondary lining is shortened, the integrity of the tunnel secondary lining is higher, and the overall force bearing effect is better.
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Description

technical field

[0001] The invention belongs to the technical field of tunnel construction, in particular to a large-section loess tunnel support system and a support construction method. Background technique

[0002] Loess refers to wind-moved deposits of yellow silt during the Quaternary period in geological time. Loess collapsibility coefficient (also called collapsibility coefficient) is a mechanical parameter to evaluate the collapsibility of loess. Under a certain pressure, loess collapsibility coefficient refers to the ratio of the height difference before and after soaking of soil samples to the original height of soil samples. The collapsibility coefficient of loess is an important index to evaluate the collapsibility of loess, which can be directly measured by experiment. According to the different collapsibility coefficient of loess, loess can be divided into collapsible loess and non-collapsible loess. Among them, non-collapsible loess refers to loess that does...

Claims

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