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随着我国经济的发展,地铁已成为改善城市交通拥堵状况的主要途径之一。但地铁隧道的施工却又不可避免地带来诸多安全隐患,例如,由于隧道施工时土层的沉降,导致管线的破裂。本文旨在通过室内大型模型试验研究地铁盾构隧道开挖时上覆土层的沉降分布特征,分别测定不同深度地层的沉降值,通过对试验数据的分析与整理,得出沉降沿地层深度的分布规律。结果表明:同一深度的地层沉降基本符合peck公式曲线;地层沉降槽的宽度值i不会随沉降量的增加而变化,只与该地层的所处深度有关;并根据试验得出沉降槽宽度i的经验公式。
With the economic development in our country, the MTR has become one of the main ways to improve the traffic congestion in the city. However, the construction of the subway tunnel inevitably brings many hidden dangers. For example, the pipeline ruptures due to the settlement of the soil during tunnel construction. The purpose of this paper is to study the subsidence distribution characteristics of the overburden soil during the excavation of subway shield tunnel by indoor large-scale model tests. The settlement values of the strata at different depths are respectively measured. The distribution of the settlement along the depth of the strata is obtained by analyzing and sorting the test data law. The results show that the settlement at the same depth accords with the Peck formula curve. The width i of the settlement trench does not change with the increase of the settlement, but only relates to the depth of the formation. According to the test, the width i Empirical formula.