Abstract The geological conditions of the Daliangshan No. 1 Tunnel on the Leshan-Xichang Expressway are com? plex, and the climate conditions are harsh, making it difficult to select the road alignment due to restrictions from the nature reserves. This paper proposes a design concept to minimize the elevation of the ridge crossing section to ensure operational safety. By setting up a fulllength parallel heading, selecting a combination of tunnel boring machine (TBM) method and drilling and blasting method for construction, and optimizing the tunnel ventilation scheme, the challenges regarding construction period and disaster prevention and rescue of the ultra-long tunnel are addressed, reducing construction risks and improving disaster rescue efficiency. The overall function, the construction and operation safety of the Project are optimized. The relevant research and implementation of the Project show that the construction scheme of the main tunnel + full-length parallel heading for ultra-long tunnels is feasible and has certain reference significance for the construction of ultra-long expressway tunnels in western mountainous areas.
Abstract：
The geological conditions of the Daliangshan No. 1 Tunnel on the Leshan-Xichang Expressway are com? plex, and the climate conditions are harsh, making it difficult to select the road alignment due to restrictions from the nature reserves. This paper proposes a design concept to minimize the elevation of the ridge crossing section to ensure operational safety. By setting up a fulllength parallel heading, selecting a combination of tunnel boring machine (TBM) method and drilling and blasting method for construction, and optimizing the tunnel ventilation scheme, the challenges regarding construction period and disaster prevention and rescue of the ultra-long tunnel are addressed, reducing construction risks and improving disaster rescue efficiency. The overall function, the construction and operation safety of the Project are optimized. The relevant research and implementation of the Project show that the construction scheme of the main tunnel + full-length parallel heading for ultra-long tunnels is feasible and has certain reference significance for the construction of ultra-long expressway tunnels in western mountainous areas.
LI Yuwen WEI Yanqing
.Key Technologies for Design and Construction of the Daliangshan No.1 Tunnel[J] MODERN TUNNELLING TECHNOLOGY, 2024,V61(2): 232-240
2024, Vol. 61 