盾构隧道穿越粉细砂层时的地表沉降分析

发布时间：2018-06-23 10:01

  本文选题：地铁 + 盾构掘进　； 参考：《城市轨道交通研究》2017年04期

【摘要】：当盾构拱顶遇到粉细砂层,地表沉降累积值和速率均易超标。通过绘制单线盾构隧道地表沉降空间分布图,发现沉降大的区域与粉细砂层有明显的相关性。原因是粉细砂的粘聚力较小,自稳性差,容易受扰动坍塌,引起较大超挖。采用有限元软件Plaxis进行数值模拟。结果表明,相同盾构掘进参数下,含粉细砂区域的地层地表沉降明显偏大。
[Abstract]:Through drawing the distribution map of surface settlement of single - wire shield tunnel , it is found that the area with large settlement is obviously related to the fine sand layer . The reason is that the cohesive force of fine sand is small , the self - stability is poor , the disturbance collapse is easy , and the large super - excavation is caused . The numerical simulation is carried out by using finite element software Plaxis . The results show that the surface subsidence of stratum with fine sand area is obviously larger than that of the same shield tunneling parameter .
【作者单位】： 北京市勘察设计研究院有限公司;
【分类号】：U455.43;P642.26
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本文编号：2056747