Research on the Minimum Thickness of Covering Soil of Shield Tunnel in Silt Soil Layer
彭文 PENG Wen
（江苏中车城市发展有限公司，无锡 214104）
（Jiangsu CRRC Urban Development Co.，Ltd.，Wuxi 214104，China）
摘要： 在采用盾构法施工的隧道中，通常情况下隧道顶部覆土厚度大于1倍隧道直径，当盾构隧道下穿河流时，就可能会出现隧道覆土厚度不满足隧道抗浮性能要求的情况。本文采用理论计算方法，对台州地区淤泥质土层中盾构隧道最小覆土厚度进行了研究，并结合工程施工监测数据对理论分析的结果进行了验证，盾构隧道下穿河流时，在隧道顶部的覆土厚度只有5米的情况下，当采取一系列技术措施后，隧道的抗浮性能满足要求，且隧道的实际轴线与设计轴线的偏差满足规范要求。
Abstract: Usually, the thickness of covering soil is greater than the diameter of shield tunnel, but the anti-floating performance of the tunnel does not meet the requirements when the shield tunnel is under the river. This article research the minimum thickness of covering soil of shield tunnel in silt soil layer using theoretical analysis method in Taizhou area, and the theoretical analysis results are verified by construction monitoring data, we can see that the anti-floating performance of shield tunnel which is under the river can meet the requirements when the thickness of covering soil is 5 meters, and the deviation between actual axis and design axis of shield tunnel is less than limit value of technical specifications.
关键词： 覆土厚度；抗浮性能；淤泥土层
Key words: thickness of covering soil；anti-floating performance；silt soil layer
中图分类号：U455 文献标识码：A 文章编号：1006-4311（2022）18-098-03
DOI:10.3969/j.issn.1006-4311.2022.18.031.
文章出处：彭文. 淤泥质土层中盾构隧道最小覆土厚度研究[J]. 价值工程,2022,41(18):98-100.
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