上果园隧洞后段变形段施工技术总结

Summary of Construction Technology of Deformation Section in the Back Section of Shangguoyuan Tunnel

在隧洞的施工中,由于地质条件多变性、复杂性,在工程前期的地质勘探中,难以摸清具体的岩层情况,所以常常会遇到由于地质问题造成的钢架挤压变形等灾害,其中以凝灰岩风化囊作为代表。隧洞在凝灰岩风化囊施工时,如果不采取正确的处理措施,发生钢架挤压变形的风险极大。介绍了云南省滇中引水工程大理Ⅰ段施工6标上果园隧洞后段在施工中遇到钢架挤压变形时的处理措施,总结出一套实用、有效的施工经验,对后续同类工程施工具有很大的指导意义。

In the construction of tunnel,due to the variability and complexity of geological conditions,it is difficult to find out the specific rock stratum in the geological exploration in the early stage of the project.Therefore,disasters such as steel frame extru-sion deformation caused by geological problems are often encoun-tered,which is represented by tuff weathering bursa.When the tun-nel is constructed in tuff weathering bursa,if correct treatment measures are not taken,there is a great risk of steel frame extru-sion deformation.This paper introduces the treatment measures for the extrusion deformation of steel frame in the construction of the rear section of Shangguoyuan tunnel in Dali section I of central Yunnan water diversion project,and summarizes a set of practical and effective construction experience,which has great guiding sig-nificance for the follow-up construction of similar projects.