Abstract: To identify the engineering geological problems of the TongmaiLulang section of SichuanTibet railway, and reasonably choose the route, the engineering geological study is conducted on route selection of the TongmaiLulang section tunnel based on remote sensing interpretation and regional geological data, field investigation, geophysical exploration, drilling, insitu stress testing, and petrological experiments, and high crustal stress, high geothermal activities, and hydrogeological problems of the Yarlung Zangbo suture zone. Additionally, the principle of engineering geological route selection in this section is proposed. The comprehensive analysis shows that the CK scheme of Parlung Zangbo north bank is superior to the C1K scheme of twospan suture zone in terms of regional stability, insitu stress, and ground temperature.

Key words: SichuanTibet railway； , Yarlung Zangbo suture zone； , high crustal stress； , high geothermal； , route selection principle