| 综合降水技术在胡麻岭隧道富水粉细砂地层中的应用 |
| On the Application of the Comprehensive Dewatering Techniques to Humaling Tunnel in the Rich-Watered Silty Sand Stratum |
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| 中文关键词:富水粉细砂 分部台阶轻型井点降水 超前水平真空降水 重力深井负压降水 地表重力式深井降水 |
| 英文关键词:rich-watered fine sand light well-point dewatering by segment steps dewatering by advanced horizontal vacuum negative pressure dewatering by gravity type deep wells dewatering by ground gravity-type deep wells |
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| 中文摘要: |
| 兰渝铁路胡麻岭隧道第三系富水粉细砂地层，具有复杂敏感的水稳特性，开挖后随时间推移受地下水的补给，围岩含水率和稳定性具有显著变化的特点。经过理论分析和现场试验，确定洞内采用分部台阶轻型井点降水、超前水平真空降水、重力深井负压降水，洞外采用地表重力式深井降水。通过含水率现场测定，得到降水时机—围岩含水率的关系，确定了富水粉细砂地层隧道施工的最有利降水时机。实践证明，在富水粉细砂地层开挖支护过程中，洞内超前水平真空降水应在开挖前3 d进行，洞内分部台阶轻型井点降水及重力深井真空降水应随时跟进，洞外地表深井降水应 |
| 英文摘要: |
| The tertiary rich-watered fine sand stratum, where the Humaling Tunnel of the Lan-Yu Railway is located,has the complex and sensitive characteristics of water stability. After excavation begins, with time going on and the underground water made up continuously, the moisture content and the stability of the surrounding rock are remarkably changeable.Upon the basis of theoretical analyses and site tests,it is decided that inside the tunnel the light well-point dewatering by segment steps,dewatering by advanced horizontal vacuum, and the negative pressure dewatering by gravity-type deep wells are performed;outside the tunnel dewatering by ground gravity-type deep wells is carried out.Through testing the water content at the site, the relationship between the dewatering time and the moisture content of the surrounding rock is obtained, and thus the most favorable detwtering time for the tunnel construction in the rich-watered fine sand stratum is determined. Practice shows that in the course of supporting for excavation in the rich watered fine sand stratum the inside-tunnel dewatering by advanced horizontal vacuum should be started 3 days before the excavation begins, and the inside tunnel light well-point dewatering by segment steps and the gravity-type deep well and vacuum dewatering should follow at any time as required while the outside-tunnel ground deep-well dewatering should be started 15 days prior to the beginning of the excavation, with the moisture content of the surrounding rock steadily kept to 10%～11% so as to keep it up to the expected dewatering effect. |
| 王胜国.综合降水技术在胡麻岭隧道富水粉细砂地层中的应用[J].国防交通工程与技术,2018,16(2):53~58 |
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