杨河隧道的变形控制标准与支护措施的关系

杨河隧道地质构造复杂,洞身出现长段落炭质片岩,岩体自身强度弱、稳定性差,遇水化泥,极易坍塌。隧道掘进后,围岩变形严重,导致初期支护钢拱架扭曲、坍塌,安全控制及施工难度大。根据实测变形时态曲线和围岩压力时态曲线,应用蠕变模型反演了岩石流变参数,分析了隧道炭质片岩地段施工大变形的机理和特征;提出了炭质片岩分级标准对应的防治措施。研究取得了复杂炭质片岩条件下软弱围岩大变形控制技术突破,形成了复杂炭质片岩条件下控制隧道大变形的快速施工方法。

Relationship between Deformation Control Standard and Supporting Measures of Yanghe Tunnel

Yanghe tunnel has the particularities of complex.Hole body of Yanghe tunnel appears long paragraphs carbonaceous schist,weak rock strength,poor stability and it is easy to melt into mud with water and vulnerable to collapse.Tunnel boring and serious deformation of surrounding rock result in severe deformation and collapse of initial supporting steel arch,which means that the security control and construction is of difficulty.According to the deformation time curve and time curve of surrounding rock pressure measured in field test,creep model inversion theological parameters are adopted,to analyze the mechanisms and characteristics of the tunnel carbonaceous schist lot of construction of large deformation.Control measures corresponding with carbonaceous schist grading standards are proposed,which is the technology breakthrough of deformation control of complex carbonaceous schist condition weak wall rock.Fast construction method for large deformation control of the tunnel under complex carbonaceous schist conditions is obtained.