高地应力千枚岩地层斜井进正洞岔口地段施工技术

Construction Technology for Connection Section between Inclined Shaft and Main Tunnel in Phyllite Ground with High Ground Stress

结合兰渝铁路西秦岭隧道高地应力千枚岩地层斜井进正洞岔口地段施工技术及变形处理的工程实践,分析千枚岩地层走向与变形的关系,总结径向注浆、临时支撑等变形处理措施,有效地抑制围岩变形,同时,对该类围岩的施工技术参数及断面设计提出建议,对类似围岩地段的变形防治提供参考。

The relationship between the strike of the phyllite ground and the deformation of the tunnel is analyzed and the deformation control measures, including radial grouting and temporary support, are summarized in the paper, with the construction and deformation control of the connection section between the inclined shaft and the main tunnel of West Qinling tunnel on Lanzhou-Chongqing railway in phyllite ground with high ground stress as an example. Suggestion is also made on the technical parameters and cross-section design of such works in such ground conditions. The paper can be served as reference for similar projects in the future.