基于地层损失的复合地层盾构隧道施工沉降研究

发布时间：2018-03-27 16:58

  本文选题：盾构隧道施工　切入点：复合地层　出处：《城市轨道交通研究》2017年08期

【摘要】：盾构隧道施工诱发地面沉降的影响因素较多,但主要因素可归结为地层损失引起的地层变形。基于现有地层损失的理论,对引起地层损失的注浆过程进行模拟,依此研究复合地层盾构隧道施工对地层沉降的影响。研究结果表明:隧道贯通时,土体最大沉降和隆起区域分别位于隧道拱顶和拱底;浆液的硬化会对地表和拱顶的沉降速率产生影响,当浆液弹性模量达到最终硬化的75%时,地表和拱顶的沉降速率达到最大值并开始逐步减小;地表和拱顶沉降随浆液的逐步硬化而趋于稳定,且拱顶沉降趋于稳定的速率更快。
[Abstract]:There are many factors affecting the ground subsidence induced by shield tunnel construction, but the main factors can be attributed to the formation deformation caused by formation loss. Based on the existing theory of formation loss, the grouting process causing formation loss is simulated. The results show that the maximum settlement and uplift of soil are located at the arch top and bottom of the tunnel respectively. The hardening of slurry will affect the settlement rate of the surface and the dome. When the elastic modulus of the slurry reaches the final hardening ratio 75, the settlement rate of the surface and the dome will reach the maximum value and begin to decrease gradually. The surface and dome settlement tend to be stable with the hardening of the slurry, and the rate of the dome settlement tends to be more stable.
【作者单位】： 中铁第四勘察设计院集团有限公司;水下隧道技术湖北省工程实验室;上海同岩土木工程科技股份有限公司;
【分类号】：P642.26;U455.43
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本文编号：1672406