Curtain grouting reinforcement method for tunnel group in deep backfill area, and reinforcement effect assessment method

By employing full-section curtain grouting and various testing methods, the problem of insufficient reinforcement of the surrounding rock in tunnels in deep backfill areas was solved, tunnel stability and settlement control were achieved, accurate effect evaluation was provided, and construction safety was ensured.

WO2025236371A1 Publication Date: 2025-11-20CHINA RAILWAY 21ST BUREAU GROUP FIFTH ENGINEERING CO LTD
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Patent Information

Application Number
PCT/CN2024/103259
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-05-15
Filing Date
2024-07-03
Publication Date
2025-11-20

AI Technical Summary

Technical Problem

Existing methods cannot adequately reinforce the surrounding rock of tunnels in deep backfill areas, resulting in poor tunnel stability, large surface settlement, and difficulty in accurately evaluating the effect of grouting reinforcement.

Method used

The full-section curtain grouting method was adopted, and holes were drilled using a multi-functional hydraulic walking down-the-hole drill rig. Cement grout and dual-liquid grout were used for grouting reinforcement. The grouting effect was comprehensively evaluated by combining drilling inspection hole method, multi-wave multi-component engineering seismograph and high-definition video detection.

Benefits of technology

It effectively reinforced the surrounding rock of the tunnel, improved the stability of the tunnel and the control of surface settlement, provided a more accurate evaluation of the grouting reinforcement effect, and ensured safe and efficient construction.

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Abstract

A curtain grouting reinforcement method for a tunnel group in a deep backfill area, and a reinforcement effect assessment method. The reinforcement method comprises the following steps: S1, calibrating hole positions according to design; S2, mounting a drilling rig; S3, drilling holes; S4, burying orifice pipes; S5, performing grouting; S6, sealing the holes; and S7, performing the next drilling and grouting cycle. Investment saving and safe and efficient construction are achieved, tunnel surrounding rocks can be fully reinforced, engineering geological conditions are improved, tunnel cavern stability is good, and ground surface settlement is small. The reinforcement effect assessment method comprises an inspection-hole drilling method, multi-wave and multi-component engineering seismograph inspection, assessment based on a high-definition drilling video, assessment based on soil and stone mixture parameter changes before and after grouting, etc., such that multi-angle comprehensive analysis can be achieved, grouting reinforcement effect assessment is more accurate, and a curtain grouting effect assessment system is further improved, thereby providing research ideas for inspecting and assessing the grouting effect in soil-rock mixed backfill areas.
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