A tunnel surrounding rock control technology and construction method for soft rock tunnels that are supported before excavation

By installing elastic annular support and grouting before deep soft rock tunnels are excavated, the surrounding rock damage caused by traditional support methods is solved, the stability and waterproofness of the surrounding rock in the tunnel are achieved, and the construction cost and process complexity are reduced.

CN115839205BActive Publication Date: 2025-08-26ANHUI UNIV OF SCI & TECH
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Patent Information

Application Number
CN202210910673.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-07-29
Publication Date
2025-08-26
Estimated Expiration
2042-07-29

AI Technical Summary

Technical Problem

In deep soft rock tunnels, the traditional construction and then support methods lead to the development of surrounding rock cracks, leading to problems such as increased damage to surrounding rocks, roof tops, bottom plate bottom drums, etc. The traditional methods are costly and complicated, so it is impossible to achieve the integrity and waterproofness of the surrounding rock in the tunnel.

Method used

The tunnel surrounding rock control technology is adopted for soft rock tunnels that support before being dug. By spiral drilling in the preset direction of the tunnel ahead and installing elastic annular support, drilling holes are reamed and grouting are used to form annular support, offset the pressure of the surrounding rock, fill cracks, and achieve sealing and stability of the tunnel surrounding rock.

Benefits of technology

It reduces the damage to surrounding rocks by tunnel excavation, maintains the integrity of surrounding rocks, achieves economical and effective support control, meets the construction and waterproofing needs of deep-ground tunnels, and reduces construction costs and labor intensity.

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Abstract

The present invention discloses a tunnel surrounding rock control technology and construction method for supporting a soft rock tunnel before excavation, comprising the following construction steps: S1, designing the spiral radius of an elastic ring support (1) according to the tunnel cross-sectional dimensions, surrounding rock properties, ground stress, elastic-plastic influence zone of the tunnel surrounding rock, and mechanical characteristics of the elastic support, determining the length of the elastic ring support (1) along the preset tunnel strike, whether grouting treatment is required, fixing the anchor length, and arranging the position; S2, performing spiral drilling in a predetermined direction on site using a drilling rig (11) and navigation equipment, and reaching a designated bottom plate; the tunnel surrounding rock control technology and construction method for supporting a soft rock tunnel before excavation of the present invention can be applied not only to soft rock tunnel support, but also to reinforced support of mine tunnels under deep complex geological conditions and high stress environments, as well as reinforced support of deep-sea tunnels and deep underground tunnels, reinforced support of tunnels under surface water bodies, and reinforced support of military underground tunnels.
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