Underpass construction method for karst-related area

By classifying and improving the slag from tunnel boring machines (TBMs), fine-grained slag is used to prepare slag improvement grout for pre-filling karst cavities and pre-strengthening the strata. Combined with real-time monitoring data to dynamically adjust parameters, a layered grouting support is formed, which solves the problems of high safety risks, high costs, and waste of slag resources in karst areas during TBM construction, and improves the economy and stability of construction.

CN121952609APending Publication Date: 2026-05-01CHINA RAILWAY 20TH BUREAU GRP SOUTHERN ENG CO LTD
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Patent Information

Application Number
CN202512013677.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-29
Publication Date
2026-05-01

AI Technical Summary

Technical Problem

In shield tunneling, construction in karst areas presents high safety risks, high costs for grouting materials, and significant waste of excavated soil resources. Furthermore, the lack of real-time monitoring data to support the adjustment of grouting parameters leads to insufficient precision in construction control.

Method used

The excavated soil from the tunnel boring machine is classified and improved on-site to form aggregate soil that can be backfilled and fine-grained soil that can be used to prepare grouting slurry. The fine-grained soil is used to prepare soil improvement slurry for pre-filling karst cavities and pre-grouting reinforcement of the strata. The grouting parameters and tunneling parameters are dynamically adjusted in combination with real-time monitoring data to form a layered grouting support system.

Benefits of technology

This approach enables the resource utilization of slag and soil, reduces the cost of grouting materials, improves the safety and reliability of construction, ensures the effectiveness of ground reinforcement and the stability of the tunnel structure, and solves the economic and environmental problems in karst area construction.

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Abstract

The invention discloses a karst-related area interval underpass construction method, and relates to the technical field of tunnel engineering, and the karst-related area interval underpass construction method comprises the following steps: carrying out field classification and improvement treatment on soft rock muck discharged by shield tunneling to obtain aggregate muck which can be directly used for backfilling and fine-grain muck which can be used for preparing grouting slurry; muck improvement slurry is prepared from fine muck, karst cavities on the construction path are pre-filled, and advanced grouting reinforcement is conducted on the stratum of the underpass section; during the period that shield tunneling penetrates through a karst area or penetrates through an existing structure under the karst area, synchronous grouting is conducted through muck improvement grout, and grouting parameters and tunneling parameters are dynamically adjusted according to real-time monitoring data; and after segmental lining is completed, compensation grouting is conducted through muck improved grout, and a stacked grouting supporting system is formed in the surrounding rock. According to the method, the shield muck can be recycled, the grouting material cost is reduced, and the safety and reliability of shield underneath pass construction are ensured.
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