复合地层盾构施工对上覆管线变形影响研究

Study on Influence of Shield Tunneling in Composite Strata on Deformation of Overlying Pipelines

摘要:

为了探究上软下硬复合地层盾构施工对上覆管线的影响，依托青岛市15号线南四区间为背景，通过有限元软件，建立数值模型。采用单因素分析法，研究了管线直径、软硬岩复合比和水位埋深对管线变形的影响规律，并通过正交实验对管线直径、软硬岩复合比及水位埋深进行敏感性分析，研究各因素对管线变形的影响程度。结果表明：随着管线直径增大、软硬岩复合比的减小以及水位埋深增加，管线的竖向位移呈现减小的趋势；并通过多因素敏感性分析确定各因素影响程度排序为：软硬岩复合比＞水位埋深＞管线直径。

Abstract:

To explore the influence of shield tunneling in upper-soft and lower-hard composite strata on overlying pipelines, a numerical model is established by using finite element software based on the South Fourth Section of Qingdao Metro Line 15. Single-factor analysis is adopted to study the effects of pipeline diameter, composite ratio of soft and hard rocks, and burial depth of the groundwater level on pipeline deformation. Additionally, orthogonal experiments are conducted for sensitivity analysis of pipeline diameter, soft-hard rock composite ratio and groundwater level burial depth, and the degree of influence of each factor on pipeline deformation is studied. The results indicate that as the pipeline diameter increases, the composite ratio of soft and hard rocks decreases, and the burial depth of the groundwater level increases, the vertical displacement of the pipeline tends to decrease. Through the multi-factor sensitivity analysis, the order of influence of these factors is determined, that is the composite ratio of soft and hard rocks > burial depth of the groundwater level > pipeline diameter.