软弱地质条件下大跨隧道地下风机房多道分岔施工土工环境影响数值分析——以苏州长江路南延工程为例

Numerical Analysis of Geotechnical Environmental Impacts of Multi-Channel Bifurcation Construction of Underground Wind Turbine Rooms in Large-Span Tunnels under Soft Geological Conditions—Taking Suzhou Yangtze River Road South Extension Project as an Example

摘要: 地下风机房具有断面多、跨度大、结构复杂、洞室交叉多、群洞效应明显等特点，本文通过三维有限元分析软件设置两种开挖工况来研究地下洞群、交叉连接段、大跨地下风机房的空间结构受力特征、变形特征、围岩的变化规律、破坏范围等，以优化开挖顺序，降低施工风险，总结地下风机房施工更优的施工方案，为后续同类工程提供经验。结论表明“先整体，后局部”开挖方式对周边土工环境影响不大，但先贯通“局部”可以有效减小后续管道施工对其影响扰动，结合实际工程，可以优先考虑各类管道优先贯通后，再进行整体风机房的分区分块开挖。

Abstract: Underground wind turbine room has the characteristics of many sections, large span, complex structure, many cave crossings, obvious effect of group holes, etc. In this paper, two excavation conditions are set up by three-dimensional finite element analysis software to study the spatial structural stress characteristics, deformation characteristics, change rule of surrounding rock, damage range of underground wind turbine room, etc., in order to optimize the sequence of excavation, reduce the risk of construction, and summarize the construction of underground wind turbine room. To optimize the excavation sequence, reduce the construction risk, summarize the underground wind turbine room construction and provide experience for the subsequent similar projects, the conclusion shows that the excavation method of “whole first, then local” has little impact on the surrounding geotechnical environment, but the first through the “local” can effectively reduce the subsequent pipeline construction on the impact of disturbance, combined with the actual project, you can prioritize the various types of pipelines through the priority, then the overall fan room will be excavated in subdivided sections.