既有隧道下的隧道施工引起的沉降评价

发布时间：2018-12-27 13:51

【摘要】：既有隧道下的隧道施工引起的沉降日益受到比以往更多的关注。由于在这些基础设施(建筑地面,砌体地下隧道,管道和其他设施)下的隧道施工在过去几十年隧道施工对现有基础设施建设的损害已经产生。基于Mair的理论分析和确定在既有隧道下新隧道施工引起的地面沉降和地面体积损失之间关系。由方程和三维有限元数值模拟确定地面沉降。计算现有隧道因新隧道施工引起的最大沉降。通过使用三维有限元分析,提出因隧道施工导致现有隧道的沉降和地面体积损失的控制方法。在新隧道施工之前使用大管棚(LPS)增强技术,通过与不使用LPS增强技术的情况进行比较,从而对使用LPS增强技术对地面体积损失控制的效果进行评价。结果表明LPS增强技术可以显著减少新隧道施工导致现有隧道的沉降,地面损失方法被证明是估计LPS增强效应的有效途径。
[Abstract]:Settlement caused by tunnel construction under existing tunnels has been paid more and more attention than ever before. Tunnel construction under these infrastructure (building floors, masonry underground tunnels, pipelines and other facilities) has caused damage to existing infrastructure over the past few decades. Based on the Mair theory, the relationship between the ground subsidence and the ground volume loss caused by the new tunnel construction under the existing tunnel is analyzed and determined. The land subsidence is determined by the equation and three-dimensional finite element numerical simulation. Calculate the maximum settlement of existing tunnels due to new tunnel construction. By using three-dimensional finite element analysis, the control method of tunnel settlement and ground volume loss caused by tunnel construction is proposed. Before the construction of the new tunnel, the large pipe shed (LPS) reinforcement technology was used, and the effect of the LPS reinforcement technology on the control of the ground volume loss was evaluated by comparing it with the situation without using the LPS reinforcement technique. The results show that LPS enhancement technique can significantly reduce the settlement of existing tunnels caused by new tunnel construction. The method of ground loss has been proved to be an effective way to estimate the enhancement effect of LPS.
【作者单位】：湖南省高速公路建设开发总公司;
【分类号】：U455.4

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