期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2019
卷号：304
期号：3
页码：1-9
DOI：10.1088/1755-1315/304/3/032009
出版社：IOP Publishing
摘要：For a three-lane tunnel with large cross-section and one-way excavation, it is of great significance to select a reasonable scheme of entering and leaving the tunnel for the economy, safety and protection of the ecological environment of the tunnel construction. Taking Changshanpu No. 2 Tunnel as an example, the reasons for the optimization of the tunnel section are analyzed, the advantages of the optimization scheme are discussed, and the reasonable scheme is given. Through the numerical simulation of the outlet section, the monitoring data of the top of the tunnel and the analysis of the comprehensive index, it is concluded that the previous double-sided wall method is optimized to three-step temporary inverted arch method at 30m away from the outlet of the tunnel, which has the following advantages: (1) the construction space is large, the mechanical operation is convenient, the construction progress is accelerated, and the schedule requirements are met; (2) the construction of the temporary construction facilities and the large excavation in tunnel outlet section are avoided; (3) The method of three-step temporary inverted arch can be separately closed into rings, effectively restraining the deformation of surrounding rock, and the monitoring measurement meets the requirements. Therefore, the use of three-step temporary inverted arch method can improve the safety and efficiency of such highway tunnel construction, and provide a reference for future construction.
