滨海地区地铁隧道盾构法联络通道渣土改良技术研究
姜鹏1张崇1李刚2董子博3邓岳保2朱瑶宏2
Muck Improvement Technology for Connection Passage of Shield Tunneling Metro Tunnels in Coastal Areas
JIANG Peng1ZHANG Chong1LI Gang2DONG Zibo3DENG Yuebao2ZHU Yaohong2
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作者信息:1.中铁十九局集团轨道交通工程有限公司，101300，北京
2.宁波大学滨海城市轨道交通协同创新中心，315211，宁波
3.宁波用躬科技有限公司，315105，宁波
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Affiliation:1.China Railway 19th Bureau Group Co., Ltd., 101300, Beijing, China
2.Collaborative Innovation Center of Coastal Urban Rail Transit，Ningbo University, 315211, Ningbo, China
3.Ningbo Yonggong Technology Co., Ltd., 315105, Ningbo，China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2025.01.008
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中图分类号/CLCN:TU442∶U455.43
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栏目/Col:研究报告
摘要:
［目的］土压平衡盾构机在滨海地区黏性土层推进过程中，常发生泥饼、出土不顺、土仓闭塞等现象。为满足盾构掘进要求，需对黏性土层渣土改良技术进行研究。［方法］依托宁波地铁5号线联络通道粉质黏土盾构工程，通过渣土改良试验确定最优泡沫剂质量分数和最佳泡沫剂注入比，将试验成果应用于联络通道盾构施工现场以检验改良技术的可靠性，基于有限元法分析渣土改良前后盾构施工对场地土层变形的影响。［结果及结论］通过试验确定最优泡沫剂质量分数为3%，最佳泡沫剂注入比为20%。将试验成果应用于联络通道盾构施工现场渣土改良，发现场地土层改良后盾构刀盘扭矩和推力均显著下降，且刀盘处未形成泥饼，现场施工处于良好状态。有限元法分析表明，渣土改良后地面沉降虽有所增加但数值较小。
Abstracts:
［Objective］ In the process of the earth pressure balance shield machine advancing in the coastal area cohesive soil layer, phenomena such as mud cake formation, unsmooth muck discharge, and blockage of the soil chamber often occur. In order to meet the requirements of shield tunneling, it is necessary to study the muck improvement technology in the cohesive soil layer. ［Method］ Based on a silty clay shield tunneling project of the connection passage on Ningbo Metro Line 5, the optimal mass fraction and the best injection ratio of the foaming agent are determined through the muck improvement test. The test results are applied to the shield tunneling construction site of the connection passage to verify the reliability of the improvement technology. The finite element method is used to analyze the influence of shield tunneling construction on the deformation of the soil layer at the site before and after the muck improvement. ［Result & Conclusion］ The optimal mass fraction and the best injection ratio of the foaming agent are determined to be 3% and 20% respectively through tests. The test results are applied to the muck improvement at the shield tunneling construction site of the connection passage. It is found that both the torque and thrust of the shield cutter head decrease significantly after the improvement of the soil layer at the site, and no mud cake is formed at the cutter head. The on-site construction is in a good state. The finite element method analysis shows that despite the increasing after the muck improvement， the ground settlement is relatively small.
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