| 王安春,苏培东,刘小虎,田春雨,魏国俊,李勇.地铁盾构隧道浅层天然气驱替优化与全周期治理技术研究[J].矿产勘查,2025,16(S2):190-200 |
| 地铁盾构隧道浅层天然气驱替优化与全周期治理技术研究 |
| Research on optimization of shallow natural gas displacement and full-cycle management technology in subway shield tunnels |
| 投稿时间：2025-11-29 |
| DOI：10.20008/j.kckc.2025s2026 |
| 中文关键词: 地铁盾构隧道 浅层天然气 群孔效应 钻孔优化 全周期治理 |
| 英文关键词: subway shield tunnel shallow natural gas multi-hole effect drilling optimization full-cycle management |
| 基金项目:本文受四川省自然科学重大项目(2025ZNSFSC0004)资助。 |
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| 中文摘要: |
| 针对地铁盾构隧道浅层天然气驱替中多孔布置引发的 "群孔效应 "导致气体滞留问题，本研究以四川成眉线工程为依托，结合数值模拟的手段，研究了注气、抽排孔间浅层天然气驱替过程演化规律，提出驱替钻孔优化与全周期治理技术，创新采用加密抽排孔策略(间距 6m)显著消除滞留现象。构建“设计 -驱替 -掘进-运营” 4阶段工程体系:设计阶段首创双线隧道一孔多用注气布局，降低 30%钻孔成本；驱替阶段研发自动降水抽排系统，规避地下水设备损坏；掘进阶段采用分段驱替 -掘进联动模式，结合复合衬砌与盾尾多道密封技术；运营阶段改造驱替孔为永久逸散系统。结合实际工程案例，明确了驱替效果验收的核心标准:目标段落各钻孔天然气检测浓度需均低于 0. 1%。此标准与配套的全周期治理技术共同为城市地铁浅层天然气治理提供了可复制、可推广的标准化实践路径。 |
| 英文摘要: |
| The study addresses gas retention from the "multi-hole effect" during shallow natural gas displace. ment in subway shield tunnels. The study uses the Chengdu-Meishan Line project as a case study. It employsnumerical simulation to investigate the gas displacement process between injection and extraction boreholes. Thestudy proposes an optimized drilling layout and a full-cycle management strategy. A key innovation introduces closer-spaced extraction boreholes at 6 m intervals. This strategy significantly eliminates the gas retention phenomenon. This study establishes a four-phase engineering system covering "Design，Displacement，Excava. tion，and Operation". The design phase pioneers a multi-purpose gas injection layout for twin tunnels，reducing borehole costs by 30%. The displacement phase develops an automated dewatering and extraction system to prevent groundwater-induced equipment damage. The excavation phase implements a segmented displacement-excavation linkage mode，combined with composite lining and multiple tail seal technologies. The operation phaseconverts displacement boreholes into a permanent venting system. Based on a practical engineering case，this study defines the core acceptance criterion for gas displacement effectiveness:the natural gas concentration in every borehole of the target section must measure below 0. 1%. This criterion，together with the supporting full-cycle management strategy，provides a replicable and scalable standardized practice for shallow natural gas treat.ment in urban subway projects. |
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