为了探讨新建隧道下穿既有隧道时对既有隧道的静力影响程度，应用可拓学物元理论，考虑新建下穿隧道与既有隧道间的相互关系，建立了考虑既有隧道洞径、新建隧道洞径、两隧道净距、围岩级别以及既有隧道埋深的静力影响程度评价模型，并将该模型得到的工程实例评价结果与实际结果进行了比较。结果表明，所建立的模型能够满足实际工程需要，可用于对下穿隧道对既有隧道静力影响程度的定性分析和定量评价。%In order to discuss the static mechanics impact degree of a newly-built below-crossing tunnel on an existing tunnel,the extenics matter-element theory was applied. An evaluating model about the static mechanics impact degree was established by considering the relationship between the newly-built tunnel and the existing tunnel,including the principal elements of existing tunnel's radius, newly-built tunnel's radius,net distance between the two tunnels,surrounding rock grade and existing tunnel depth. In addition,the evaluating result for a project example based on this model was compared with its actual effect. The comparison result shows that the established model is able to satisfy the practical projects' needs,so it can be used to the qualitative analysis and quantitative evaluation towards the static mechanics impact of below-crossing tunnel.
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