| 采用长距离水平冻结暗挖法的浅埋大断面地铁隧道施工技术 |
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| 引用本文： | 姚直书,蔡海兵,程桦,马进.采用长距离水平冻结暗挖法的浅埋大断面地铁隧道施工技术[J].中国铁道科学,2011,32(1). |
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| 作者姓名： | 姚直书 蔡海兵 程桦 马进 |
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| 作者单位： | 1. 安徽理工大学,土木建筑学院,安徽,淮南,232001
2. 中煤特殊凿井集团,安徽,淮北,235004 |
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| 基金项目： | 国家自然科学基金资助项目(51044004); 安徽省自然科学基金资助项目(090414165); 安徽省高等学校省级自然科学研究重点资助项目(KJ2009A010) |
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| 摘 要： | 通过人工冻土试验、有限元数值分析和大型物理模型试验,研究浅埋大断面地铁隧道采用长距离水平冻结暗挖法的施工技术。通过现场土的人工冻土试验,得到土体冻结的物理力学指标。有限元数值分析结果表明,随着冻结壁厚度的增加,冻结壁的强度和稳定性增加。大型物理模型试验结果表明,冻胀和融沉量都随着冻结壁厚度的增加而明显增大;当冻结壁厚度为4.5 m时,预测实际工程地表冻胀和融沉量均已超过允许值。根据上述研究结果,进行了冻结施工方案的设计和优化。在施工过程中,改进超长距离水平冻结管连接方式,采用跟管钻进新技术,确保了冻结孔的成孔质量;采取设置卸压孔、加大盐水流量和融沉跟踪注浆等技术措施,有效地控制了地面的冻胀和融沉,确保了工程顺利地完成。
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| 关 键 词： | 地铁隧道 水平冻结暗挖法 冻土试验 有限元数值分析 大型物理模型试验 施工技术 |
Construction Technique for the Shallow-Buried Subway Tunnel with Large-Section by Long-Distance Horizontal Ground Freezing Method and Undermining Method |
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| YAO Zhishu,CAI Haibing,CHENG Hua,MA Jin.Construction Technique for the Shallow-Buried Subway Tunnel with Large-Section by Long-Distance Horizontal Ground Freezing Method and Undermining Method[J].China Railway Science,2011,32(1). |
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| Authors: | YAO Zhishu CAI Haibing CHENG Hua MA Jin |
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| Institution: | YAO Zhishu1,CAI Haibing1,CHENG Hua1,MA Jin2(1.College of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan Anhui 232001,China,2.China Coal Special Dompany Company Ltd.,Huaibei Anhui 235004,China) |
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| Abstract: | Based on the artificially frozen soil test,finite element numerical simulation and large-scale physical model test,the construction technology of long-distance horizontal ground freezing method and undermining method adopted for the construction of shallow-buried subway tunnel with large-section was studied.The physical and mechanical indexes of the frozen soil were obtained after the artificially frozen soil test on the in-situ undisturbed soil sample.The finite element numerical analysis results indicate ... |
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| Keywords: | Subway tunnel Horizontal ground freezing and undermining method Frozen soil test Finite element numerical analysis Large-scale physical model test Construction technology |
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