富水粉细砂层盾构接收综合施工方法
陈昱秉1刘志贺2肖方奇2刘伟2刘念武1甘晓露1陈生汉3
Comprehensive Construction Method for Shield Receiving in Water-rich Silty Sand Stratum
CHEN Yubing1LIU Zhihe2XIAO Fangqi2LIU Wei2LIU Nianwu1GAN Xiaolu1CHEN Shenghan3
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作者信息:1.浙江理工大学建筑工程学院，310051，杭州
2.中车建设工程有限公司，100078，北京
3.宏润建设集团股份有限公司，311202，上海
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Affiliation:1.School of Civil Engineering and Architecture, Zhejiang Sci-Tech University, 310051, Hangzhou, China
2.CRRC Construction Engineering Group Co., Ltd., 100078, Beijing, China
3.Hongrun Construction Group Co., Ltd., 311202, Shanghai, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.12.026
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中图分类号/CLCN:U442.55
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栏目/Col:研究报告
摘要:
［目的］为了解决郑州地铁3号线隧道工程施工中因不明障碍物导致刀盘受损而被迫停工的施工问题，有必要对富水粉细砂土层条件下盾构接收综合施工方法进行研究。［方法］介绍了盾构接收综合施工方案，综合运用了双环冻结法、积极降水、矿山法及盾构空推施工等方法，结合现场监测数据对冻结温度变化特性及关键施工技术进行了分析。［结果及结论］该综合施工方法在处理富水粉细砂土层条件下的盾构接收问题是安全有效的。采用双环冻结法，结合积极降水可以有效防止矿山法隧道的涌水、涌砂病害问题。在对内环冻结壁采用吹蒸汽解冻的过程中，会导致外环冻结壁温度上升约5℃。当利用盾构空推法通过未完全化冻的矿山法隧道时，最大盾构推力为26500kN，小于盾构推进摩阻力理论计算值，此时的地面位移及隧道变形均满足控制要求。盾构空推时，盾构外壳与内环未完全化冻土体交界处的温度维持在3℃左右。当矿山法施工穿越冻结区时，距离隧道近处的地层产生了不同程度的沉降，而远离隧道的部分地层沉降趋势较为稳定。
Abstracts:
［Objective］ To address the issue of cutterhead damage and subsequent work stoppages caused by unidentified obstructions during the construction of Zhengzhou Metro Line 3 tunnel, it is essential to study comprehensive construction methods for shield receiving in water-rich silty sand stratum. ［Method］ A comprehensive construction plan for shield receiving is introduced, incorporating techniques such as the double-ring freezing method, active dewatering, mining methods, and shield empty push construction. The temperature variation characteristics of freezing and key construction technologies are analyzed using on-site monitoring data. ［Result & Conclusion］ The comprehensive construction plan is proven to be safe and effective for dealing with shield receiving in water-rich silty sand stratum conditions. Adopting double-ring freezing method combined with active dewatering could effectively prevent issues related to water and sand inflows in mining method tunnels. During the steam thawing process of the inner ring freezing wall, the temperature of the outer ring freezing wall increases by approximately 5 ℃. When employing the shield empty push method through a mining method tunnel that is not fully thawed, the maximum shield thrust is 26 500 kN, which is less than the theoretical value of shield push resistance. At this point, the ground displacement and tunnel deformation all meet control requirements. During shield empty pushing, the temperature at the interface between shield casing and partially thawed inner ring soil remains around 3 ℃. When crossing the frozen zone using the mining method, different levels of land subsidence are observed near the tunnel, while the soil layer subsidence trend far away from the tunnel remains relatively stable.
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