在两正洞拱部施工的时候，左右洞拱顶沉降约占最终沉降的70%。
The settlement of the two tunnels' arc crown occurs during the construction of arc part covers 70% of the final settlement.
应用有限元数值方法，对连拱隧道“三导洞法”施工时围岩和结构的受力、变形规律进行了分析。在两正洞拱部施工的时候，左右洞拱顶沉降约占最终沉降的70%。
The regularity of stress and strain of surrounding rock and support structure when using(3-heading) excavation method to construct double-arc tunnel is carried out by FEM numerical method.
整个结构划分为若干组合单元，每个组合单元包括拱、桁梁及竖杆横撑架三部分。
The structure is resolved into several compound elements and every compound element consist of three parts: arch, trussed beam and lateral brace.
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