地面堆载对既有盾构隧道结构影响的试验研究

Model Test on Influence of Ground Heaped Load on Existing Shield Tunnel Structure

地面堆载对既有盾构隧道结构影响的研究对既有隧道的保护具有重要意义,而隧道的埋深和堆载位置是其中两个关键的因素。本文在调研国内外研究成果的基础上,结合上海本地工程特点,根据不同隧道埋深(D为隧道直径,选取1D、2D、3D三种)和堆载位置(D为隧道直径,选取0、1D、2D、3D四种),通过室内模型试验对堆卸载作用下既有盾构隧道结构的变形特征进行研究。根据试验结果,文章总结了在埋深和堆载位置影响下,既有盾构隧道在地面堆载作用下的变形规律。试验结果对既有盾构隧道的使用和保护提供了参考依据。

It is important to study the tunnel＇s deformation in the loading and unloading conditions from ground heap for protecting the existing tunnel,where the depth of tunnel and the location of heaped load are two key points. This thesis based on the research results at home and abroad, combined with the Shanghai local engineering parame- ters, selected three groups of variables ： the tunnel depth （ denote the tunnel diameter as D, select three cases as the 1D, 2D, 3D） , loading position { denote the tunnel diameter as D, taking 0, 1D, 2D, 3D four cases） , using labora- tory experiments to study the deformation of existing shield tunnel affected by the heaped load. Based on the experi- ment, the paper summarized the regular pattern of the displacement of existing tunnel in different locations and at dif- ferent depths. The conclusion can be referenced for the use and protection of existed shield tunnel.