Full-section advanced curtain grouting construction method for water-rich broken geological zone tunnel

A technology of breaking geology and advanced curtain, applied in tunnels, tunnel linings, underground chambers, etc., can solve the problems of high pumping and drainage pressure, high risk of flooding, damage to the surface ecological environment, etc., to save construction costs, safe secondary lining effect of structure

Pending Publication Date: 2021-02-26
CHINA RAILWAY 12TH BUREAU GRP +1
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Problems solved by technology

[0004] In tunnels with extremely developed cracks and long anti-slope construction sections, the tunnel and the surface water system are unimpeded, which destroys the surface ecological environment, the pressure of pumping and drainage is high, and the risk of flooding is extremely high due to water gushing

Method used

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  • Full-section advanced curtain grouting construction method for water-rich broken geological zone tunnel

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Embodiment

[0062] Example: The designed surrounding rock of the tunnel is medium to slightly weathered granite, the geological conditions are extremely complex, and cracks are developed. The tunnel site passes through 16 fault structures and multiple low-resistance anomaly zones. The 1262m section from the tunnel entrance to K94+480 is a forward slope with a slope of -0.4%. With K94+480 as the boundary along the excavation direction, it is a reverse slope, that is, the downhill section with a slope of 2%. The construction length of the reverse slope is 2.0Km. The water gushing face of the line is located in the reverse slope section of the tunnel, which causes the water seepage and gushing water in the tunnel to collect along the slope to the face of the tunnel under the action of gravity. Therefore, it is necessary to pump and drain the accumulated water in time to prevent the water accumulation on the face of the construction face from being too deep , affecting the stability of the sur...

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Abstract

The invention belongs to the technical field of tunnel construction, and particularly relates to a full-section advanced curtain grouting construction method for a water-rich broken geological zone tunnel. The full-section advanced curtain grouting construction method comprises the following steps that S100, construction preparation is conducted; S200, a grout stopping wall is constructed; S300, surveying and setting out are conducted, a hole site is marked, a drilling position is set out on a working surface according to the hole site of the design drawing and drilling parameters, and the drilling position is calibrated with paint; S400, opening and drilling are conducted, the elevation angle and the horizontal angle of a drill rod are adjusted, a drilling machine is moved, a drill bit isaligned with the marked hole position, a prism is placed at the tail end of the drill rod, and the posture of the drill rod is checked and adjusted through a total station; S500, an orifice pipe is mounted; S600, advancing type segmented grouting is conducted; and S700, holes are drilled to detect the grouting effect.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, in particular to a full-section advanced curtain grouting construction method for a tunnel in a water-rich fractured geological zone. Background technique [0002] With the rapid development of the economy, the demand for traffic in various regions is gradually expanding. In order to form a complete highway traffic network, the expressways continue to develop to the mountainous areas, which makes the construction of mountain tunnels more and more. The tunnels pass through the mountains. Water gushing and mud inrush and landslides are becoming more and more common due to the exposure of water-rich formations. For example, in the Zhongjiashan Tunnel of Jilian Expressway, after the tunnel face advanced to the F2 fault, more than ten large-scale, long-lasting, and destructive water and mud inrush disasters occurred, with a cumulative mud inrush volume of about 40,000m 3 , and even caused...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10E21D11/38E21D9/00
CPCE21D11/105E21D11/38E21D9/001
Inventor 马希平李建军温辉翟建国刘军华杨鲜明
Owner CHINA RAILWAY 12TH BUREAU GRP
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