Loess tunnel foundation base reinforcing structure and method based on high pressure jet grouting piles

A technology for high-pressure rotary jetting piles and loess tunnels, which is used in infrastructure engineering, tunnels, tunnel linings, etc., can solve the problems of difficult tunnel base settlement control, difficult tunnel base settlement control, and large tunnel and surface settlement. The effect of high construction efficiency, low input construction cost and low input cost
CN110671131APending Publication Date: 2020-01-10THE NO 6 ENG CO LTD OF CHINA RAILWAY 20TH BUREAU GRP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
THE NO 6 ENG CO LTD OF CHINA RAILWAY 20TH BUREAU GRP
Publication Date
2020-01-10

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Abstract

The invention discloses a loess tunnel foundation base reinforcing structure and method based on high pressure jet grouting piles. The structure comprises the multiple rows of high pressure jet grouting piles for reinforcing soil on the lower portion of a tunnel, and each high pressure jet grouting pile passes through a tunnel invert structure and a collapsible loess stratum from top to bottom andthen extends into a non collapsible loess stratum. The method comprises the following steps of firstly, tunnel excavating and preliminary bracing; secondly, second lining construction; and thirdly, foundation base reinforcing. The structure is reasonable in design, easy and convenient to construct and good in use effect. The multiple rows of high pressure jet grouting piles are adopted for carrying out foundation base reinforcing on a loess tunnel, a loess tunnel foundation base can be simply and rapidly effectively reinforced, the tunnel foundation base settling volume can be effectively controlled, meanwhile, the upper surface of a secondary lining inverted arch is adjusted to the horizontal plane, a construction platform is provided for the high pressure jet grouting piles, the loess tunnel foundation base reinforcing process can be further quickened, the high pressure jet grouting piles and the tunnel invert structure are fastened and connected into a whole, and the loess tunnel foundation base reinforcing effect can be further improved.
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Description

technical field

[0001] The invention belongs to the technical field of loess tunnel construction, and in particular relates to a loess tunnel base reinforcement structure and method based on high-pressure rotary grouting piles. Background technique

[0002] Loess refers to sediments of yellow silt transported by wind during the Quaternary period in the geological era. 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 difference between the height of the soil sample before and after soaking in water and the original height of the soil sample. 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 no...

Claims

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