| 盾构下穿已建隧道施工参数分析及监测 |
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| 引用本文： | 苑宝军,王毅恒,周丁恒.盾构下穿已建隧道施工参数分析及监测[J].北京理工大学学报,2016,36(S2):159-163. |
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| 作者姓名： | 苑宝军 王毅恒 周丁恒 |
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| 作者单位： | 西南交通大学 土木工程学院, 四川, 成都 610031,四川理工学院 土木工程学院, 四川, 自贡 643000,中铁第五勘察设计集团有限公司, 北京 102600 |
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| 基金项目： | 四川省高校重点实验室开放基金项目（2014QYJ06） |
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| 摘 要： | 探讨了盾构下穿已建隧道全过程下土仓压力、同步注浆压力及注浆量、顶力及推进速度等盾构参数变化，并详细分析了已建隧道变形.结论为：前3个参数是已建隧道变形的主要影响因素，为控制性指标；通过监测反馈，土仓压力建议为静止土压力的1.5～1.8倍，且小于主动土压力；同步注浆压力应控制在地层土压力范围内，注浆量应为盾尾间隙的1.4～1.8倍；推进速度要保持在均匀低速状态，以减小对周围土体的扰动和控制长期变形.
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| 关 键 词： | 盾构 已建隧道 下穿 施工参数 监测 |
| 收稿时间： | 2016/10/30 0:00:00 |
Parameters Analysis and Monitoring of Shield Undercrossing Existing Tunnel |
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| YUAN Bao-jun,WANG Yi-heng and ZHOU Ding-heng.Parameters Analysis and Monitoring of Shield Undercrossing Existing Tunnel[J].Journal of Beijing Institute of Technology(Natural Science Edition),2016,36(S2):159-163. |
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| Authors: | YUAN Bao-jun WANG Yi-heng and ZHOU Ding-heng |
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| Institution: | College of Civil Engineering, Southwest Jiaotong University, Chengdu, Sichuan 611031, China,College of Civil Engineering, Sichuan University of Science & Engineering, Zigong, Sichuan 643000, China and China Railway Fifth Survey and Design Institute Group Co., LTD, Beijing 102600, China |
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| Abstract: | Soil warehouse pressure, synchronous grouting pressure and volume, shield thrust and advance speed of shield tunnel undercrossing existing tunnels were summarized. Existing tunnels deformation was analyzed. Conclusions are as follows. Firstly, soil warehouse pressure, synchronous grouting pressure and volume are main factors affecting existing tunnel deformation and control parameters for shield crossing. Secondly, soil warehouse pressure should be 1.5 to 1.8 times of static earth pressure and a little smaller than passive earth pressure. Thirdly, synchronous grouting pressure should be controlled in the range of formation pressure value and grouting volume should be 1.5 to 1.8 times of shield end clearance. Finally, advance speed should be in a low and uniform state. |
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| Keywords: | shield existing tunnel undercrossing construction parameter monitoring |
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