Key technologies for construction of expressway tunnels in mountainous areas Key technologies for constructing large-diameter shield tunnels through urban core areas 并列题名：Key technologies for constructing large-diameter shield tunnels through urban core areas Key technologies for construction of cross-overlapping twisted shield tunnel groups Key technologies for design and construction of shield tunnels in pebble stratum immersed in water Survey & design technologies for expressway in mountainous areas Key technologies for the construction of Xiangyang Hanjiang third bridge