Soft rock waterproof layer construction method for tunnel at large deformation section of soft rock

By constructing an initial waterproof layer, reinforcing key nodes, and forming a composite waterproof system in the tunnel section with large deformation in soft rock, the systemic defects in the construction of the waterproof layer were solved, and the reliability of waterproofing and structural stability were improved.

CN121701244APending Publication Date: 2026-03-20CHINA RAILWAY 20TH BUREAU GROUP CO LTD
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Patent Information

Application Number
CN202512027562.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-30
Publication Date
2026-03-20

AI Technical Summary

Technical Problem

Existing methods for constructing waterproof layers in tunnels with large deformation in soft rock sections suffer from several drawbacks: insufficient waterproof performance of the initial support system, failure of grouting reinforcement to form an effective waterproof bearing ring, lack of quantitative criteria and dynamic response mechanisms for deformation monitoring and reinforcement, unsystematic waterproofing and reinforcement measures at stress concentration points such as arch feet, and loose connections between various waterproofing processes, all of which lead to a high risk of water leakage.

Method used

A shotcrete layer is applied to the tunnel excavation outline, a full-ring steel arch frame is erected and a system of anchor bolts is installed. After grouting along the entire length, shotcrete is applied again to form the initial support layer. At the arch foot, anchor pipe grouting is performed, deformation monitoring is carried out, and radial grouting holes are drilled in abnormal areas for reinforcement grouting. After the deformation stabilizes, a waterproof layer is laid and a secondary lining is poured to form a composite waterproof system.

Benefits of technology

It improves the waterproof reliability and structural durability of tunnels in soft rock sections with large deformation, effectively prevents groundwater infiltration, enhances the waterproof bearing capacity of key nodes, and achieves dynamic response and systematic waterproofing treatment.

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Abstract

The invention discloses a soft rock waterproof layer construction method for a soft rock large-deformation section tunnel, and relates to the technical field of soft rock waterproof layer construction of the soft rock large-deformation section tunnel. The construction method of the soft rock waterproof layer for the tunnel at the large deformation section of the soft rock comprises the steps that a sprayed concrete layer is constructed, a full-ring-shaped steel arch frame is erected, system anchor rods are constructed, concrete is sprayed again after full-length grouting is conducted, and a primary supporting layer containing a grouting reinforcing ring is formed; locking anchor pipe grouting is carried out on the arch springing part to form a local reinforced waterproof bearing body; based on deformation monitoring data, dynamic judgment is carried out, and radial reinforcing grouting is carried out on the obvious deformation part; and after deformation is stable, a waterproof layer is laid, a secondary lining is poured, and a composite waterproof system is formed. The waterproof reliability and the structural durability of the soft rock waterproof layer of the tunnel at the large deformation section of the soft rock can be improved.
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