Study on Stability of Shield Subway Tunnel Closely-underneath-crossing the Existing Tunnel in Round Gravel Soil
孙孝海 SUN Xiao-hai
（中国电建集团昆明勘测设计研究院有限公司，昆明 650000）
（PowerChina Kunming Engineering Corporation Limited，Kunming 650000，China）
摘要：利用大型有限元软件 Midas GTS/NX 建立近距下穿施工的三维模型，探讨既有轨道交通 4 号线和 5 号线在盾构施工中的位移变化。结果表明：①既有隧道各监测点在新建隧道中轴线附近位移变化速率最大；②最佳注浆加固厚度为 0.04m 左右。
Abstract: Midas GTS/NX finite element software is used to establish a three -dimensional model of short -distance underpass construction, and the displacement change of existing rail transit line 4 and Line 5 in shield construction is discussed. The results show that:①The displacement rate of each monitoring point in the existing tunnel is the largest near the central axis of the new tunnel; ②The best grouting reinforcement thickness is about 0.04m.
关键词：近距下穿；盾构隧道；数值模拟
Key words: closely-underneath-crossing；shield tunnel；numerical simulation
中图分类号：U455.43 文献标识码：A 文章编号：1006-4311（2024）28-067-03 doi:10.3969/j.issn.1006-4311.2024.28.020
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