There are many choices in design scheme of auxiliary
tunnels for mountainous expressway extralong tunnels, and it cost time
and labor with high technical requirements. Therefore, the overall plan,
structural design, and other key technologies of auxiliary tunnels and
underground connecting tunnels are studied and summarized based on the design
and consulting practice of multiple extralong tunnels
completed. Main conclusions are as follows: (1) The study of auxiliary channel
schemes should be determined from the perspectives of auxiliary construction
and operational ventilation, and comprehensive scheme comparison and selection
should be conducted. (2) For tunnels with small traffic volume, the smoke
stroke can appropriately exceed 5 000 m under fire conditions, and full jet
longitudinal smoke exhaust should be adopted. (3) The proposed "central
underground fan room" scheme can reduce the scale of underground tunnel
engineering by approximately 45%, effectively reducing construction risks and
engineering costs. (4) The use of "complementary ventilation" can
effectively reduce the scale of civil engineering and operating costs.
ZHENG Yong, LI Hao, YIN Zhifeng, CHEN Junwu, HE Jun, ZHENG Xin
. Practice and Reflection on Design of Auxiliary
Channels for Highway Tunnels in Yunnan Province, China[J]. Tunnel Construction, 2023
, 43(S2)
: 428
-436
.
DOI: 10.3973/j.issn.2096-4498.2023.S2.047
