基于尖点突变理论的软弱围岩隧道变形稳定性研究——以贵南铁路大方山隧道为例

Research on Deformation Stability of Weak Surrounding Rock Tunnel Based on Cusp Catastrophe Theory-Taking Dafangshan Tunnel of Guiyang-Nanning Railway as an Example

在隧道施工过程中,围岩变形受地质构造、围岩强度、跨径、埋深等诸多因素的影响。目前,无论是围岩的变形量还是变形速率都未对围岩的稳定性判定形成一个统一的定量标准。鉴于此,文章结合现场隧道监控量数据,采用尖点突变理论,以突变特征值作为围岩稳定性的定量判据判定围岩的变形稳定性,分析结果与现场施工情况一致,研究成果可为软弱隧道围岩的稳定性判定提供一种定量评价的方法,对实际工程具有一定的指导意义。

In the process of tunnel construction,the deformation of surrounding rocks is affected by many factors such as geological structure,surrounding rock strength,span and burial depth.At present,neither the deformation amount nor the deformation rate of the surrounding rock has formed a unified quantitative standard for determining the stability of the surrounding rock.In view of this,combined with the on-site tunnel monitoring data,this paper adopts the cusp catastrophe theory to determine the deformation stability of the surrounding rock with catastrophe eigenvalue as the quantitative criterion of the surrounding rock stability.The analysis results are consistent with the on-site construction situation.The research results can provide a quantitative evaluation method for the stability determination of weak tunnel surrounding rock,which has certain guiding significance for practical engineering.